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Da Silva LG, Da Silva LG, Ferreira LCL, Mascarello J, Moraes JGN, Lucy MC, Nogueira É. Factors influencing pregnancy per artificial insemination (AI) and embryonic mortality in Nelore females subjected to timed-AI in Brazil. Anim Reprod Sci 2024; 265:107475. [PMID: 38663149 DOI: 10.1016/j.anireprosci.2024.107475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 04/14/2024] [Indexed: 05/24/2024]
Abstract
A greater understanding of factors influencing fertility is essential to improve pregnancy rates and reduce the occurrence of embryonic mortality in beef herds. The objective of the current study was to evaluate retrospective data of pregnancy per artificial insemination (P/AI) and pregnancy loss in Nelore females subjected to timed-AI (TAI) in Brazil. Data from 40,104 TAI collected from six breeding seasons (2016-2022) were analyzed, and the effects of animal category (e.g., classification based on age and parity), farm, month of parturition, sire, sire breed (Nelore vs Angus), estrus expression at TAI, animal temperament, and body condition scores (BCS) were evaluated. P/AI and pregnancy loss were affected (P < 0.001) by animal category. There was also an effect of farm (P = 0.0013) on P/AI and pregnancy loss (P = 0.001), as P/AI ranged from 49.28% and 55.58% and pregnancy loss from 3.37% to 6.89% across the herds evaluated. Month of parturition also affected (P < 0.001) P/AI and was higher for cows that became pregnant at the beginning of the previous breeding season. Calmer animals, presenting lower velocity scores while exiting the chute following TAI, achieved higher P/AI (P < 0.001). Lower BCS at TAI was associated (P < 0.001) with increased pregnancy loss, and BCS gain following AI was associated (P < 0.001) with reduced rates of embryonic mortality. There was a major effect (P < 0.001) of sire on P/AI and pregnancy loss, as P/AI ranged from 11% to 79%, and embryonic mortality from 0% to 40% for the bulls used in the study, highlighting the importance of the sire fertility on overall pregnancy success. Results from the current study reinforce the idea that animal age and parity at the beginning of the breeding season, BCS at the onset of estrous synchronization, BCS gain following AI, estrus expression at TAI, sire, and month of parturition are important factors influencing P/AI and rates of embryonic mortality in beef herds.
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Affiliation(s)
- Lucas Gomes Da Silva
- Universidade Federal de Mato Grosso do Sul, Post Graduation Program of Veterinary Medicine- CIVET-UFMS, Campo Grandes, Brazil
| | - Luana Gomes Da Silva
- Universidade Federal de Mato Grosso do Sul, Post-Graduation Program of Animal Science, Campo Grande, MS, Brazil; Cia Pecuaria Assessoria, Campo Grande, MS, Brazil
| | | | - Julia Mascarello
- Universidade Federal de Mato Grosso do Sul, Post Graduation Program of Veterinary Medicine- CIVET-UFMS, Campo Grandes, Brazil
| | | | | | - Ériklis Nogueira
- Brazilian Agricultural Research Corporation- EMBRAPA Beef Cattle, Av. Rádio Maia, 830, Campo Grande - MS, 79106-550, Brazil; Universidade Federal de Mato Grosso do Sul, Post Graduation Program of Veterinary Medicine- CIVET-UFMS, Campo Grandes, Brazil.
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2
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Perry GA, Ketchum JN, Quail LK. Importance of preovulatory estradiol on uterine receptivity and luteal function. Anim Reprod 2023; 20:e20230061. [PMID: 37720725 PMCID: PMC10503890 DOI: 10.1590/1984-3143-ar2023-0061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Accepted: 07/18/2023] [Indexed: 09/19/2023] Open
Abstract
Animals that exhibited estrus had greater pregnancy success compared to animals that did not exhibit estrus before fixed-time AI (FTAI). Estradiol is synthesized in bovine ovarian follicles under gonadotropin regulation and can directly and indirectly regulate the uterine receptivity and luteal function. Estradiol concentrations at FTAI impacted oviductal gene expression and has been reported to play an important role in establishing the timing of uterine receptivity. These changes have been reported to impact uterine pH and sperm transport to the site of fertilization. After fertilization, preovulatory estradiol has been reported to improve embryo survival likely by mediating changes in uterine blood flow, endometrial thickness and changes in histotroph. Cows with greater estradiol concentrations at the time of GnRH-induced ovulation also had a larger dominant follicle size and greater circulating progesterone concentrations on day 7. Therefore, it is impossible to accurately determine the individual benefit of greater estradiol concentrations prior to ovulation and greater progesterone concentrations following ovulation to pregnancy establishment, as these two measurements are confounded. Research has indicated an importance in the occurrence and timing of increasing preovulatory concentrations of estradiol, but increasing estradiol concentrations by supplementation may not be sufficient to increase fertility. Increased production of estradiol by the preovulatory follicle may be required to enhance fertility through the regulation of sperm transport, fertilization, oviductal secretions, the uterine environment, and embryo survival.
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Affiliation(s)
| | - Jaclyn Nicole Ketchum
- Texas A&M AgriLife Research, Overton, Texas, United States of America
- Department of Animal Science, Texas A&M University, College Station, Texas, United States of America
| | - Lacey Kay Quail
- Texas A&M AgriLife Research, Overton, Texas, United States of America
- Department of Animal Science, Texas A&M University, College Station, Texas, United States of America
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3
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Ketchum JN, Perry GA, Quail LK, Epperson KM, Ogg MA, Zezeski AL, Rich JJJ, Zoca SM, Kline AC, Andrews TN, Ortega MS, Smith MF, Geary TW. Influence of preovulatory estradiol treatment on the maintenance of pregnancy in beef cattle receiving in vivo produced embryos. Anim Reprod Sci 2023; 255:107274. [PMID: 37320862 DOI: 10.1016/j.anireprosci.2023.107274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 04/12/2023] [Accepted: 06/02/2023] [Indexed: 06/17/2023]
Abstract
This experiment was designed to determine the role of preovulatory estradiol in pregnancy retention after embryo transfer (ET). Cows were synchronized with the 7-d CO-Synch + CIDR® protocol. On d0 (d-2 =CIDR® removal), cows were grouped by estrual status (estrual [Positive Control] and nonestrual), and nonestrual cows were administered Gonadotropin Releasing Hormone (GnRH) and randomly assigned to either no treatment (Negative Control) or Estradiol (0.1 mg estradiol 17-β IM). All cows received an embryo on d7. Pregnancy status was retrospectively classified on d56, 30, 24, and 19 by either ultrasonography, plasma pregnancy-associated glycoproteins analysis (PAGs), expression of interferon-stimulated genes, plasma progesterone (P4) concentrations, or a combination of the factors. There was no difference in estradiol concentrations on day 0 h 0 (P > 0.16). At day 0 h 2, Estradiol cows (15.7 ± 0.25 pg/mL) had elevated (P < 0.001) estradiol compared with Positive Controls (3.4 ± 0.26 pg/mL) or Negative Controls (4.3 ± 0.25 pg/mL). On d19, pregnancy rates did not differ (P = 0.14) among treatments. On d24, Positive Controls (47%) had greater (P < 0.01) pregnancy rates than Negative Controls (32%); Estradiol cows were intermediate (40%). There was no difference (P = 0.38) in pregnancy rates between Positive Control (41%) and Estradiol (36%) cows on d30, but Negative Control (27%) cows had (P = 0.01) or tended (P = 0.08) to have decreased pregnancy rates, respectively. Thus, preovulatory estradiol may elicit an effect on early uterine attachment or alter histotroph components, consequently improving pregnancy maintenance through d30.
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Affiliation(s)
- J N Ketchum
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA; Texas A&M AgriLife Research, Overton, TX 75684, USA
| | - G A Perry
- Texas A&M AgriLife Research, Overton, TX 75684, USA
| | - L K Quail
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA; Texas A&M AgriLife Research, Overton, TX 75684, USA
| | - K M Epperson
- Department of Animal Science, Texas A&M University, College Station, TX 77843, USA; Texas A&M AgriLife Research, Overton, TX 75684, USA; Northwest Missouri State University, Maryville, MO 64468, USA
| | - M A Ogg
- Department of Animal and Range Sciences, Montana State University, Bozeman, MT 59717, USA
| | - A L Zezeski
- USDA-ARS, Fort Keogh Livestock and Range Research Laboratory, Miles City, MT 59301, USA
| | - J J J Rich
- College of Agriculture, Arkansas State University, Jonesboro, AR 72467, USA
| | - S Menegatti Zoca
- Department of Animal Science, University of Tennessee, Knoxville 37996, USA; Department of Animal Science, South Dakota State University, Brookings, SD 57007, USA
| | - A C Kline
- Department of Animal Science, South Dakota State University, Brookings, SD 57007, USA
| | - T N Andrews
- Department of Animal Science, South Dakota State University, Brookings, SD 57007, USA
| | - M S Ortega
- Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA; Animal&Dairy Science, University of Wisconsin Madison, Madison, WI 53706, USA
| | - M F Smith
- Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA
| | - T W Geary
- USDA-ARS, Fort Keogh Livestock and Range Research Laboratory, Miles City, MT 59301, USA.
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4
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Costa CB, Fair T, Seneda MM. Review: Environment of the ovulatory follicle: modifications and use of biotechnologies to enhance oocyte competence and increase fertility in cattle. Animal 2023; 17 Suppl 1:100866. [PMID: 37567670 DOI: 10.1016/j.animal.2023.100866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 05/15/2023] [Accepted: 05/16/2023] [Indexed: 08/13/2023] Open
Abstract
The oocyte is the basis of life, supporting development from a fertilized cell to an independent multicellular organism. The oocyte's competence to drive the first cell cycles postfertilization are critical to embryonic survival and subsequent successful pregnancy. Coupled with the complex processes of follicle assembly, activation, differentiation, growth, and terminal maturation, oocyte developmental competence is gradually acquired during oocyte growth and meiotic maturation. Most reproduction management technologies and interventions are centered around these highly coordinated processes, targeting the ovarian follicle and the oocyte within. Thus, our objective was to highlight key aspects of oocyte and follicle development in cattle, and to discuss recent advances in oocyte and follicle-centered reproductive biotechnologies.
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Affiliation(s)
- Camila Bortoliero Costa
- Department of Biological Sciences, School of Sciences and Languages, São Paulo State University (UNESP), Campus Assis, São Paulo, Brazil; Graduate Program in Pharmacology and Biotechnology, Institute of Biosciences, UNESP, Botucatu, São Paulo, Brazil
| | - Trudee Fair
- School of Agriculture and Food Science, University College Dublin, Ireland
| | - Marcelo M Seneda
- State University of Londrina (UEL), Laboratory of Animal Reproduction, Londrina, PR, Brazil.
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5
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McLean MK, Geary TW, Zezeski AL, Smith MF, Spencer TE, Pohler KG, Reese ST, Perry GA. Impact of preovulatory estradiol concentrations on subsequent luteal function in beef cattle. Syst Biol Reprod Med 2022; 68:286-297. [PMID: 35394393 DOI: 10.1080/19396368.2022.2038717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
It has been hypothesized that circulating concentrations of estradiol during the preovulatory period, can impact subsequent progesterone concentrations. Ovulation was synchronized in nonlactating beef cows (n = 53). Cows that exhibited estrus before gonadotrophin-releasing hormone (GnRH)-induced ovulation (d 0) had greater (p<.01) peak concentrations of estradiol compared with cows that did not express estrus (11.5 ± 0.8 vs. 6.2 ± 0.6 pg/mL), respectively, but there was no difference in ovulatory follicle size (p= .80) or interval from GnRH2 to ovulation (p=.23). Circulating concentrations of progesterone during luteal formation (d 3-7; p=.70 and p=.77) or mid-luteal phase (d 8-14; p=.39 and p=.12) were not affected by elevated periovulatory estradiol or an interaction with day. To investigate the direct influence of estradiol on luteal function, ovulation (d 0) was synchronized in nonlactating beef cows and cows were allocated to three groups (control, n = 5; vehicle injection, n = 4; or an estradiol antagonist (Fulvestrant; ICI 182,780), n = 4. Intrafollicular injection of vehicle (100 µL) or an estradiol antagonist (25 μg Fulvestrant in 100 µL) into the largest follicle occurred on d -2. Concentrations of estradiol increased (p<.0001) from d -2 to 0 but did not differ among groups (p>.50). Furthermore, plasma concentrations of progesterone on d 0 through 20 were not affected by treatment (p=.86). These results indicate that elevated preovulatory estradiol before ovulation was not required to prepare granulosa cells for luteinization or subsequent luteal progesterone secretion but did tend to impact luteal lifespan.
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Affiliation(s)
| | - Thomas W Geary
- USDA-ARS, Fort Keogh Livestock and Range Research Lab, Miles City, MT, USA
| | - Abby L Zezeski
- USDA-ARS, Fort Keogh Livestock and Range Research Lab, Miles City, MT, USA
| | | | | | - Ky G Pohler
- Texas A&M University, College Station, TX, USA
| | | | - George A Perry
- Texas A&M AgriLife Research and Extension Center, Overton, TX, USA
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6
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Ciernia LA, Perry GA, Smith MF, Rich JJ, Northrop EJ, Perkins SD, Green JA, Zezeski AL, Geary TW. Effect of estradiol preceding and progesterone subsequent to ovulation on proportion of postpartum beef cows pregnant. Anim Reprod Sci 2021; 227:106723. [PMID: 33621845 DOI: 10.1016/j.anireprosci.2021.106723] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 02/09/2021] [Accepted: 02/10/2021] [Indexed: 11/29/2022]
Abstract
Two experiments were conducted to examine the effect of plasma concentrations of 17β-estradiol (E2) preceding and progesterone (P4) subsequent to ovulation on proportions of beef cows pregnant following embryo transfer. Timing of ovulation (d 0) among postpartum cows was synchronized and cows that expressed estrus were removed from each study. In Experiment 1, plasma E2 concentration on d 0 was used to classify cows (n = 353) into Low, Medium, and High E2 groups. Pregnancy rate for cows with Low, Medium, or High E2 concentrations were different (P < 0.05). In Experiment 2, there were multiple administrations of PGF2α to evaluate the independent effects of Low or High E2 before ovulation and Low or Normal (no treatment) P4 after ovulation on proportions of cows pregnant. Treatment groups in Experiment 2, therefore, were: Low E2-Low P4 (LL; n = 71), Low E2-Normal P4 (LN; n = 69), High E2-Low P4 (HL; n = 74), and High E2-Normal P4 (HN; n = 73). Concentrations of P4 on d 7 subsequent to ovulation were less (P < 0.05) in cows of the HL compared to HN, and in LL compared to LN groups. Concentrations of E2 on d -2, 0, and change in E2 (d -2 to d 0) had a positive effect (P < 0.008) on pregnancy rates. In summary, relatively greater E2 concentrations preceding ovulation; and relatively greater P4 concentrations subsequent to ovulation combined with lesser E2 concentrations preceding ovulation had a positive effect on proportions of postpartum cows pregnant.
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Affiliation(s)
| | - G A Perry
- South Dakota State University, Brookings, SD, USA
| | - M F Smith
- University of Missouri, Columbia, MO, USA
| | - J J Rich
- South Dakota State University, Brookings, SD, USA
| | - E J Northrop
- South Dakota State University, Brookings, SD, USA
| | - S D Perkins
- South Dakota State University, Brookings, SD, USA
| | - J A Green
- University of Missouri, Columbia, MO, USA
| | - A L Zezeski
- USDA-ARS, Fort Keogh Livestock and Range Research Lab, Miles City, MT, USA
| | - T W Geary
- USDA-ARS, Fort Keogh Livestock and Range Research Lab, Miles City, MT, USA.
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7
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Sá Filho MFD, Gonella-Diaza AM, Sponchiado M, Mendanha MF, Pugliesi G, Ramos RDS, Andrade SCDS, Gasparin G, Coutinho LL, Goissis MD, Mesquita FS, Baruselli PS, Binelli M. Impact of hormonal modulation at proestrus on ovarian responses and uterine gene expression of suckled anestrous beef cows. J Anim Sci Biotechnol 2017; 8:79. [PMID: 29118976 PMCID: PMC5664832 DOI: 10.1186/s40104-017-0211-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 09/04/2017] [Indexed: 11/24/2022] Open
Abstract
Background This study evaluated the impact of hormonal modulation at the onset of proestrus on ovarian response and uterine gene expression of beef cows. Methods A total of 172 anestrous beef cows were assigned to one of four groups according to the treatment with estradiol cypionate (ECP) and/or equine chorionic gonadotropin (eCG) [CON (n = 43), ECP (n = 43), eCG (n = 44) and ECP + eCG (n = 42)]. Results ECP-treated cows (ECP and ECP + eCG groups) presented greater occurrence of estrus (44.6% vs. 65.4%; P = 0.01) and pregnancy per AI [47.1% vs. 33.3%; P = 0.07], but similar progesterone (P4) concentration at subsequent diestrus than cows not treated with ECP (CON and eCG groups). Nonetheless, eCG-treated cows (eCG and ECP + eCG groups) presented larger follicle at timed AI (12.6 ± 0.3 vs. 13.5 ± 0.3 mm; P = 0.03), greater ovulation rate (96.5% vs. 82.6%; P = 0.008) and greater P4 concentration at d 6 (3.9 ± 0.2 vs. 4.8 ± 0.2 ng/mL; P = 0.001) than cows not treated with eCG (CON and ECP groups). Next, cows with a new corpus luteum 6 d after TAI were submitted to uterine biopsy procedure. Uterine fragments [CON (n = 6), ECP (n = 6)] were analyzed by RNA-Seq and a total of 135 transcripts were differentially expressed between groups (73 genes up-regulated by ECP treatment). Subsequently, uterine samples were analyzed by qPCR (genes associated with cell proliferation). ECP treatment induced greater abundance of PTCH2 (P = 0.07) and COL4A1 (P = 0.02), whereas suppressed EGFR (P = 0.09) expression. Conversely, eCG treatment increased abundance of HB-EGF (P = 0.06), ESR2 (P = 0.09), and ITGB3 (P = 0.05), whereas it reduced transcription of ESR1 (P = 0.05). Collectively, supplementation with ECP or eCG at the onset of proestrous of anestrous beef cows influenced ovarian responses, global and specific endometrial gene expression. Conclusion Proestrus estradiol regulate the endometrial transcriptome, particularly stimulating proliferative activity in the endometrium. Electronic supplementary material The online version of this article (10.1186/s40104-017-0211-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | | | | | | | | | | | | | - Gustavo Gasparin
- Laboratório de Biotecnologia Animal, ESALQ-USP, Av Pádua Dias, Piracicaba, SP 11 Brazil
| | - Luiz Lehmann Coutinho
- Laboratório de Biotecnologia Animal, ESALQ-USP, Av Pádua Dias, Piracicaba, SP 11 Brazil
| | | | | | | | - Mario Binelli
- Departamento de Reprodução Animal, FMVZ-USP, São Paulo, SP Brazil.,Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, Avenida Duque de Caxias Norte, 225, Pirassununga, SP Zip Code 13635900 Brazil
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8
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Pessoa G, Martini A, Carloto G, Rodrigues M, Claro Júnior I, Baruselli P, Brauner C, Rubin M, Corrêa M, Leivas F, Sá Filho M. Different doses of equine chorionic gonadotropin on ovarian follicular growth and pregnancy rate of suckled Bos taurus beef cows subjected to timed artificial insemination protocol. Theriogenology 2016; 85:792-799. [DOI: 10.1016/j.theriogenology.2015.09.057] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 09/10/2015] [Accepted: 09/14/2015] [Indexed: 11/16/2022]
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9
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e Silva Filho PPC, de Sousa Sales JN, de Sá Filho MF, Perecin F, de Assis Neto AC, Baruselli PS, Vincenti L. Effects of Equine Chorionic Gonadotropin on Follicular, Luteal and Conceptus Development of Non-LactatingBos IndicusBeef Cows Subjected to a Progesterone Plus Estradiol-Based Timed Artificial Insemination Protocol. ITALIAN JOURNAL OF ANIMAL SCIENCE 2016. [DOI: 10.4081/ijas.2013.e61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Rodríguez FM, Colombero M, Amweg AN, Huber E, Gareis NC, Salvetti NR, Ortega HH, Rey F. Involvement of PAPP-A and IGFR1 in Cystic Ovarian Disease in Cattle. Reprod Domest Anim 2015; 50:659-68. [PMID: 26031184 DOI: 10.1111/rda.12547] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 05/09/2015] [Indexed: 12/21/2022]
Abstract
Cystic ovarian disease (COD) is one of the main causes of infertility in dairy cattle. It has been shown that intra-ovarian factors, such as members of the insulin-like growth factor (IGF) system, may contribute to follicular persistence. The bioavailability of IGF to initiate its response by binding to specific receptors (IGFRs) depends on interactions with related compounds, such as pregnancy-associated plasma protein A (PAPP-A). The aim of this study was to determine IGFR1 and PAPP-A expression both in follicles at different stages of development and in cysts, to evaluate the roles in the etiopathogenesis of COD in cattle. The mRNA expression of PAPP-A was higher in granulosa cells of large tertiary follicles than in cysts, whereas the protein PAPP-A present in the follicular fluid from these follicles showed no differences. Although no PAPP-A mRNA expression was detected in smaller tertiary follicles, in their follicular fluid, this protease was detected in lesser concentration than in cysts. The mRNA expression of IGFR1 was lower in granulosa cells from cystic follicles than in those from tertiary ones. However, the protein expression of this receptor presented the highest levels in cystic structures, probably to increase the possibility of IGF response. The data obtained would indicate that animals with COD have an altered regulation of the IGF system in the ovary, which could be involved in the pathogenesis of this disease in cattle.
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Affiliation(s)
- F M Rodríguez
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
| | - M Colombero
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
| | - A N Amweg
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
| | - E Huber
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
| | - N C Gareis
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
| | - N R Salvetti
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
| | - H H Ortega
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
| | - F Rey
- Laboratorio de Biología Celular y Molecular Aplicada, Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral (UNL), Esperanza, Santa Fe, Argentina.,Instituto de Ciencias Veterinarias del Litoral (ICIVET Litoral), Universidad Nacional del Litoral (UNL)/Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Esperanza, Santa Fe, Argentina
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11
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Uslenghi G, Chaves SG, Cabodevila J, Callejas S. Effect of estradiol cypionate and amount of progesterone in the intravaginal device on synchronization of estrus, ovulation and on pregnancy rate in beef cows treated with FTAI based protocols. Anim Reprod Sci 2014; 145:1-7. [DOI: 10.1016/j.anireprosci.2013.12.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 12/07/2013] [Accepted: 12/13/2013] [Indexed: 11/30/2022]
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12
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Eborn DR, Cushman RA, Echternkamp SE. Effect of postweaning diet on ovarian development and fertility in replacement beef heifers1. J Anim Sci 2013; 91:4168-79. [DOI: 10.2527/jas.2012-5877] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- D. R. Eborn
- USDA, ARS, U.S. Meat Animal Research Center, Clay Center, NE 68933
| | - R. A. Cushman
- USDA, ARS, U.S. Meat Animal Research Center, Clay Center, NE 68933
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13
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Pitaluga P, Sá Filho M, Sales J, Baruselli P, Vincenti L. Manipulation of the proestrous by exogenous gonadotropin and estradiol during a timed artificial insemination protocol in suckled Bos indicus beef cows. Livest Sci 2013. [DOI: 10.1016/j.livsci.2013.02.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Fátima LA, Baruselli PS, Gimenes LU, Binelli M, Rennó FP, Murphy BD, Papa PC. Global gene expression in the bovine corpus luteum is altered after stimulatory and superovulatory treatments. Reprod Fertil Dev 2013; 25:998-1011. [DOI: 10.1071/rd12155] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 09/05/2012] [Indexed: 01/05/2023] Open
Abstract
Equine chorionic gonadotrophin (eCG) has been widely used in superovulation and artificial insemination programmes and usually promotes an increase in corpus luteum (CL) volume and stimulates progesterone production. Therefore, to identify eCG-regulated genes in the bovine CL, the transcriptome was evaluated by microarray analysis and the expression of selected genes was validated by qPCR and western blot. Eighteen Nelore crossbred cows were divided into control (n = 5), stimulated (n = 6) and superovulated groups (n = 7). Ovulation was synchronised using a progesterone device-based protocol. Stimulated animals received 400 IU of eCG at device removal and superovulated animals received 2000 IU of eCG 4 days prior. Corpora lutea were collected 7 days after gonadotrophin-releasing hormone administration. Overall, 242 transcripts were upregulated and 111 transcripts were downregulated in stimulated cows (P ≤ 0.05) and 111 were upregulated and 113 downregulated in superovulated cows compared to the control animals (1.5-fold, P ≤ 0.05). Among the differentially expressed genes, many were involved in lipid biosynthesis and progesterone production, such as PPARG, STAR, prolactin receptors and follistatin. In conclusion, eCG modulates gene expression differently depending on the treatment, i.e. stimulatory or superovulatory. Our data contribute to the understanding of the pathways involved in increased progesterone levels observed after eCG treatment.
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Follicular determinants of pregnancy establishment and maintenance. Cell Tissue Res 2012; 349:649-64. [DOI: 10.1007/s00441-012-1386-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Accepted: 02/23/2012] [Indexed: 01/14/2023]
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