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Niciura SCM, Cardoso TF, Ibelli AMG, Okino CH, Andrade BG, Benavides MV, Chagas ACDS, Esteves SN, Minho AP, Regitano LCDA, Gondro C. Multi-omics data elucidate parasite-host-microbiota interactions and resistance to Haemonchus contortus in sheep. Parasit Vectors 2024; 17:102. [PMID: 38429820 PMCID: PMC10908167 DOI: 10.1186/s13071-024-06205-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 02/18/2024] [Indexed: 03/03/2024] Open
Abstract
BACKGROUND The integration of molecular data from hosts, parasites, and microbiota can enhance our understanding of the complex biological interactions underlying the resistance of hosts to parasites. Haemonchus contortus, the predominant sheep gastrointestinal parasite species in the tropics, causes significant production and economic losses, which are further compounded by the diminishing efficiency of chemical control owing to anthelmintic resistance. Knowledge of how the host responds to infection and how the parasite, in combination with microbiota, modulates host immunity can guide selection decisions to breed animals with improved parasite resistance. This understanding will help refine management practices and advance the development of new therapeutics for long-term helminth control. METHODS Eggs per gram (EPG) of feces were obtained from Morada Nova sheep subjected to two artificial infections with H. contortus and used as a proxy to select animals with high resistance or susceptibility for transcriptome sequencing (RNA-seq) of the abomasum and 50 K single-nucleotide genotyping. Additionally, RNA-seq data for H. contortus were generated, and amplicon sequence variants (ASV) were obtained using polymerase chain reaction amplification and sequencing of bacterial and archaeal 16S ribosomal RNA genes from sheep feces and rumen content. RESULTS The heritability estimate for EPG was 0.12. GAST, GNLY, IL13, MGRN1, FGF14, and RORC genes and transcripts were differentially expressed between resistant and susceptible animals. A genome-wide association study identified regions on chromosomes 2 and 11 that harbor candidate genes for resistance, immune response, body weight, and adaptation. Trans-expression quantitative trait loci were found between significant variants and differentially expressed transcripts. Functional co-expression modules based on sheep genes and ASVs correlated with resistance to H. contortus, showing enrichment in pathways of response to bacteria, immune and inflammatory responses, and hub features of the Christensenellaceae, Bacteroides, and Methanobrevibacter genera; Prevotellaceae family; and Verrucomicrobiota phylum. In H. contortus, some mitochondrial, collagen-, and cuticle-related genes were expressed only in parasites isolated from susceptible sheep. CONCLUSIONS The present study identified chromosome regions, genes, transcripts, and pathways involved in the elaborate interactions between the sheep host, its gastrointestinal microbiota, and the H. contortus parasite. These findings will assist in the development of animal selection strategies for parasite resistance and interdisciplinary approaches to control H. contortus infection in sheep.
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Gonçalves JD, Vergani GB, Rodrigues JND, Dias JH, Pereira VSDA, Garcia AR, Esteves SN, Fonseca JFD, Oliveira MEF. Luteal tissue characteristics of Morada Nova ewes with hCG application 7.5 days after the end of estrus synchronization protocol in the breeding season. Anim Reprod Sci 2024; 261:107396. [PMID: 38141546 DOI: 10.1016/j.anireprosci.2023.107396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 12/06/2023] [Accepted: 12/08/2023] [Indexed: 12/25/2023]
Abstract
Results with the use of hCG after synchronization protocol are still inconsistent, which may vary according to breed, season, day of application and dose of the drug used. The aim of the present study was to evaluate the functionality of luteal tissue and ovarian perfusion after hCG treatment during early luteal phase. Estrus-synchronized ewes were randomly assigned to receive i.m. injection of 300 IU of hCG (G-hCG; n = 40) or 1 mL of saline (G-Control; n = 32) on Day 7.5 after progesterone withdrawal. Ultrasonographic evaluations of the ovaries and ovarian and iliac arteries were performed on Days 7.5, 10.5, 13.5, and 21.5. The accessory corpus luteum (aCL) formation rate was 52.5% for G-hCG. There was interaction (p > 0.05) for treatment (G-hCG and G-Control), days (7.5, 10.5, 13.5 and 21.5) and PD (Pregnant and Non-pregnant) for the variables of biometric characteristics of the corpus luteum B-Mode and Color Doppler on days 7.5, 10.5, 13.5 and 21.5. There was no difference (p > 0.05) for pregnancy rates and mean fetuses per ewe between the treatment groups. It is concluded that the application of hCG 7.5 days after the hormonal protocol in Morada Nova ewes in a breeding season is efficient in inducing aCL formation and increasing luteal tissue biometry. However, there was no effect on pregnancy rate.
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Affiliation(s)
- Joedson Dantas Gonçalves
- Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900 Jaboticabal, SP, Brazil.
| | - Gabriel Brun Vergani
- Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900 Jaboticabal, SP, Brazil
| | | | - Jenniffer Hauschildt Dias
- Department of Veterinary Medicine, Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, CEP 36570-000 Viçosa, MG, Brazil
| | | | | | - Sergio Novita Esteves
- Embrapa Southeast Livestock, Rod. Washington Luiz, km 234, CEP 13560-970 São Carlos, SP, Brazil
| | | | - Maria Emilia Franco Oliveira
- Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de acesso Prof. Paulo Donato Castellane, s/n, CEP 14884-900 Jaboticabal, SP, Brazil.
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Niciura SCM, Minho AP, McIntyre J, Benavides MV, Okino CH, Esteves SN, Chagas ACDS, Amarante AFTD. In vitro culture of parasitic stages of Haemonchus contortus. Rev Bras Parasitol Vet 2023; 32:e010122. [PMID: 36651422 DOI: 10.1590/s1984-29612023005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 12/02/2022] [Indexed: 01/15/2023]
Abstract
Haemonchus contortus is a constraint to sheep production. Seeking to reduce the use of hosts and produce parasitic stages in large-scale, a 42-day in vitro culture protocol of H. contortus third-stage larvae was optimized using Dulbecco's modified Eagle's medium (DMEM). In cell-free culture, larvae were maintained at 39.6°C, in acidic media (pH 6.1) for 3 or 6 days with Δ4-dafachronic acid followed by DMEM pH 7.4 supplemented or not with Fildes' reagent. In DMEM pH 7.4 at 37°C, supplementation with Caco-2 cells was compared to Fildes. On Day 14, fourth-stage larvae (L4) development rates in acidic media supplemented (86.8-88.4%) or not (74.4-77.8%) with Fildes and in Caco-2 cell co-culture (92.6%) were similar, and superior to DMEM pH 7.4 with Fildes (0.0%). On Day 21, Caco-2 cell co-culture resulted in higher larvae differentiation (25.0%) and lower degeneration (13.9%) compared to acidic media (1.5-8.1% and 48.6-69.9%, respectively). This is the first report of prolonged in vitro culture of H. contortus larvae using commercial media in co-culture with Caco-2 cells. Although no progression to the adult stage, Caco-2 cell co-culture resulted in morphological differentiation of H. contortus L4 and larval viability for up to 28 days.
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Dias JH, Vergani GB, Gonçalves JD, Oliveira TA, Penitente-Filho JM, Pereira VSA, Esteves SN, Garcia AR, Batista RITP, Oliveira MEF, Souza-Fabjan JMG, Fonseca JF. Different doses of pFSH are effective to promote follicular growth, superovulatory response, and embryo yield in White Dorper ewes. Small Rumin Res 2023. [DOI: 10.1016/j.smallrumres.2023.106914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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de Sousa MAP, Esteves SN, Daher LCC, Gallo SB, Pereira VSDA, da Fonseca JF, Silva AGME, Brandão FZ, Oliveira MEF, Barreto ADN, Vergani GB, Garcia AR. Overnutrition of Ewe in Late Gestation and the Impact on Placental Efficiency and Lamb's Performance. Animals (Basel) 2022; 13:ani13010103. [PMID: 36611712 PMCID: PMC9817877 DOI: 10.3390/ani13010103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/24/2022] [Accepted: 11/14/2022] [Indexed: 12/29/2022] Open
Abstract
The objective of the study was to evaluate energy or energy/protein supplementation in the ewe diet, in the last third of gestation, on maternal placental and endocrine characteristics, as well as its effects on the behavior of neonatal lambs and productive performance until weaning. A total of 128 ewes were used, and the experimental diet was fed from 100 days gestation until lambing, with the birth of 172 lambs. The ewes were distributed into three treatments: CTL (control, n = 43) with metabolizable energy (ME) and crude protein (CP) intake according to NRC (1985); ME (energy supplementation, n = 44) plus 21% ME; and MECP (energy/protein supplementation, n = 41) plus 26% ME and CP. Body weight, body condition score, serum hormone concentrations, placental characteristics, lamb performance and behavior, and production efficiency of the ewe from lambing to weaning were measured. ME and MECP ewes were heavier before (p = 0.006) and just after lambing (p = 0.002) and had higher serum triiodothyronine (p = 0.001) and cortisol (p = 0.004) concentrations on the day of lambing. ME ewes had higher placental efficiency (p = 0.036) and lower total cotyledon weight (p = 0.011). ME and MECP diets increased both lamb birth weight (p = 0.015) and weaning weight (p = 0.009). Production efficiency at birth and at weaning was not influenced (p > 0.05) by treatments. Lamb behavior was influenced by the ME and MECP diets, reducing the time to kneel (p ≤ 0.05), to try to stand (p ≤ 0.05), and the latency to stand (p ≤ 0.005). It is concluded that overnutrition in the last third of gestation was positive for the ovine production system, with improved production rates, hormonal profile, placental characteristics, and neonatal behavior.
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Affiliation(s)
- Marco Antonio Paula de Sousa
- Institute of Veterinary Medicine, Federal University of Pará, Av. dos Universitários, s/n, Castanhal 68746-360, PA, Brazil
| | - Sergio Novita Esteves
- Brazilian Agricultural Research Corporation-Embrapa Southeast Livestock, Rod Washington Luiz, km 234, São Carlos 13560-970, SP, Brazil
| | - Luciara Celi Chaves Daher
- Institute of Animal Health and Production, Federal Rural University of Amazon, Av. Presidente Tancredo Neves, 2501, Belém 66077-830, PA, Brazil
| | - Sarita Bonagurio Gallo
- Faculty of Animal Science and Food Engineering, University of São Paulo, Av. Duque de Caxias Norte, 225, Pirassununga 13635-900, SP, Brazil
| | | | - Jeferson Ferreira da Fonseca
- Brazilian Agricultural Research Corporation-Embrapa Goats and Sheep, Estrada Sobral/Groaíras, km 4, Sobral 62010-970, CE, Brazil
| | - André Guimarães Maciel e Silva
- Institute of Veterinary Medicine, Federal University of Pará, Av. dos Universitários, s/n, Castanhal 68746-360, PA, Brazil
| | - Felipe Zandonadi Brandão
- School of Veterinary Medicine, Fluminense Federal University, Rua Vital Brazil, 64, Niterói 24230-340, RJ, Brazil
| | - Maria Emilia Franco Oliveira
- Brazilian Agricultural Research Corporation-Embrapa Goats and Sheep, Estrada Sobral/Groaíras, km 4, Sobral 62010-970, CE, Brazil
- Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, Jaboticabal 14884-900, SP, Brazil
| | - Andréa do Nascimento Barreto
- Institute of Veterinary Medicine, Federal University of Pará, Av. dos Universitários, s/n, Castanhal 68746-360, PA, Brazil
| | - Gabriel Brun Vergani
- Department of Pathology, Reproduction and One Health, School of Agricultural and Veterinarian Sciences, São Paulo State University, Via de Acesso Prof. Paulo Donato Castellane, s/n, Jaboticabal 14884-900, SP, Brazil
| | - Alexandre Rossetto Garcia
- Brazilian Agricultural Research Corporation-Embrapa Southeast Livestock, Rod Washington Luiz, km 234, São Carlos 13560-970, SP, Brazil
- Correspondence:
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Oliveira MEF, Arrais AM, Vergani GB, Novita Esteves S, Schinaider Do Amaral Pereira V, Garcia AR, Bastos R, Roberto Bourg Melo M, Rios Coelho Alves B, Ferreira Fonseca J. Hormonal-Induced Cervical Relaxation During Diestrus in Ewes: Cervical Transposing Feasibility and Use of hCG for Rescuing Disrupted Luteal Function. J APPL ANIM WELF SCI 2022:1-17. [PMID: 36342446 DOI: 10.1080/10888705.2022.2141576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Cervical relaxation (CR) was performed in ewes during diestrus, to prospect a feasible protocol for non-surgical embryo transfer (NSET). In Trial 1, naturally mated ewes (n=13) received CR protocols with estradiol benzoate (EB, 1 mg on D6) and oxytocin (OT, 50 IU on D7) only (G-EB+OT) or associated with human chorionic gonadotropin (hCG, 300 IU on D7, G-EB+OT+hCG) and were compared to non-hormonally treated (G-control) ewes. Estradiol concentration increased (P<0.05) from D6 to D7 in G-EB+OT and G-EB+OT+hCG, then decreased (P<0.05) on D8. The G-EB+OT had reduced (P<0.05) progesterone on D8, and 0% (0/5) pregnancy, while G-control had 100% (3/3) conception rate. The treatment with hCG mitigated the progesterone drop on D8 and resulted in 50% (2/4) conception rate. In Trial 2, cervical transposing success after treatment with EB, OT, and hCG on D6 and D7 was assessed in nulliparous (n=25) and multiparous (n=30) ewes. The EB+OT+hCG protocol allowed efficient cervical transposition (~78% of cervical transposition success into ~5 min) in nulliparous and multiparous females and did not alter total and blood perfusion areas of corpora lutea (CL). The use of EB+OT+hCG was efficient to ensure effective cervical transposing in nulliparous and multiparous ewes, with no apparent deleterious effect on CL function, and may contribute to animal welfare, allowing a less invasive NSET procedure.
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Affiliation(s)
- Maria Emilia Franco Oliveira
- Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista (UNESP), Jaboticabal, Brazil
- Embrapa Caprinos e Ovinos (CNPC), Coronel Pacheco, Brazil
| | - Aline Matos Arrais
- Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica, Brazil
| | - Gabriel Brun Vergani
- Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista (UNESP), Jaboticabal, Brazil
| | | | | | | | - Rosemary Bastos
- Universidade Estadual do Norte Fluminense Darcy Ribeiro, Brazil
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Niciura SCM, Okino CH, Nucci ADS, Malagó W, Benavides MV, Esteves SN, Chagas ACDS. Polymorphisms in exon 11 of the mptl-1 gene and monepantel resistance in Haemonchus contortus. Parasitol Res 2022; 121:3581-3588. [PMID: 36194275 DOI: 10.1007/s00436-022-07682-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 09/27/2022] [Indexed: 11/27/2022]
Abstract
Chemical treatments are the main strategy to control gastrointestinal nematodes in sheep, and the emergence of anthelmintic resistance, as consequence, results in control failures and leads to economic losses. Thus, molecular tests may constitute an excellent tool for the early detection of anthelmintic resistance-related mutations. Thus, a polymerase chain reaction (PCR)-based genotyping assay followed by polyacrylamide gel electrophoresis (PAGE) was developed to detect polymorphisms in exon 11 of the acetylcholine receptor monepantel-1 gene (mptl-1) that were previously associated with monepantel resistance through a genome-wide study in Haemonchus contortus. DNA samples recovered from individual and pooled third-stage larvae from two susceptible field-derived isolates and five (three in vivo-derived and two field-derived) resistant populations were used. New polymorphisms, including a 6-bp deletion and a 3-bp insertion, were detected in resistant individuals. These indels, confirmed using sequencing of cloned PCR products, are predicted to result in amino acid changes in transmembrane domain 2 (TMD2) of the MPTL-1 protein. The two susceptible isolates showed only the presence of the wild-type allele (100%), whereas lower frequencies of the wild-type allele were detected in monepantel-resistant populations (11.1 to 66.7%). These findings report new polymorphisms in the mptl-1 gene, validate the results obtained through genomic mapping for monepantel resistance, and provide a PCR-based assay to genotype indels located in exon 11 of mptl-1 in H. contortus.
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Affiliation(s)
- Simone Cristina Méo Niciura
- Embrapa Pecuária Sudeste, Rodovia Washington Luiz, Km 234, Fazenda Canchim, São Carlos, SP, CEP 13560-970, Brazil.
| | - Cintia Hiromi Okino
- Embrapa Pecuária Sudeste, Rodovia Washington Luiz, Km 234, Fazenda Canchim, São Carlos, SP, CEP 13560-970, Brazil
| | - Alessandra da Silva Nucci
- Centro Universitário Central Paulista, Rua Miguel Petroni, 5111, São Carlos, SP, CEP 13563-470, Brazil
| | - Wilson Malagó
- Embrapa Pecuária Sudeste, Rodovia Washington Luiz, Km 234, Fazenda Canchim, São Carlos, SP, CEP 13560-970, Brazil
| | - Magda Vieira Benavides
- Embrapa Pecuária Sul, Rodovia BR-153, Km 632,9, Vila Industrial, Bagé, RS, CEP 96401-970, Brazil
| | - Sergio Novita Esteves
- Embrapa Pecuária Sudeste, Rodovia Washington Luiz, Km 234, Fazenda Canchim, São Carlos, SP, CEP 13560-970, Brazil
| | - Ana Carolina de Souza Chagas
- Embrapa Pecuária Sudeste, Rodovia Washington Luiz, Km 234, Fazenda Canchim, São Carlos, SP, CEP 13560-970, Brazil
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Vergani GB, Fonseca JFD, Trevizan JT, Pereira VSDA, Garcia AR, Esteves SN, Brandão FZ, Souza-Fabjan JMG, Oliveira MEF. Luteotropic effects of human chorionic gonadotropin administered 7.5 days after synchronous estrous induction in Morada Nova ewes. Anim Reprod Sci 2020; 223:106644. [PMID: 33197710 DOI: 10.1016/j.anireprosci.2020.106644] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 10/15/2020] [Accepted: 10/16/2020] [Indexed: 10/23/2022]
Abstract
This study was conducted in ewes to assess effects of human chorionic gonadotropin (hCG) administration after imposing an estrous induction treatment regimen. Ewes (n = 115) were treated with a 60 mg medroxyprogesterone-intravaginal-sponge for 6 d plus 200 IU of equine chorionic gonadotropin (eCG) im and 37.5 μg d-cloprostenol im 36 h before sponge removal (Day 0). After natural mating, ewes having at least one corpus luteum (CL; n = 108) were administered either 1 mL of saline (G-Control; n = 53) or 300 IU of hCG (G-hCG; n = 55) on Day 7.5 after sponge removal (Day 0). Ovarian ultrasonography and blood collection were performed on Days 7.5, 13.5, 17.5, 21.5, and 30.5. Accessory CL (aCL) were observed in 81.5 % (G-hCG) and 0.0 % (G-Control) of ewes (P = 0.0001). Diameter, area, and volume of luteal tissue were greater (P < 0.05) in G-hCG from Day 13.5 to 30.5. Progesterone (P4) concentrations were greater (P < 0.05) on Days 13.5, 17.5, 21.5 and 30.5 for ewes of the G-hCG group. Pregnancy percentage was similar (P = 0.25) between groups [47.1 % (G-control) compared with 60.0 % (G-hCG)], although total number of lambs produced by estrous synchronized ewes was greater (P = 0.005) in ewes of the G-hCG group (90.9 % compared with 66.0 %). In conclusion, hCG administration 7.5 days after sponge removal from Morada Nova ewes during the non-breeding season is an effective treatment to induce aCL formation, improve luteal tissue biometry and P4 concentrations, and to enhance the total number of lambs born.
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Affiliation(s)
- Gabriel Brun Vergani
- Department of Pathobiology and Veterinary Theriogenology, School of Agricultural and Veterinarian Sciences, São Paulo State University, Jaboticabal, SP, Brazil
| | - Jeferson Ferreira da Fonseca
- Embrapa Caprinos e Ovinos, Rodovia MG 133, Km 42, Cep 36.155-000, Coronel Pacheco, MG, Brazil; Departamento de Veterinária, Universidade Federal de Viçosa, Av. Peter Henry Rolfs, s/n, CEP 36570-000, Viçosa, MG, Brazil.
| | - Juliane Teramachi Trevizan
- Department of Pathobiology and Veterinary Theriogenology, School of Agricultural and Veterinarian Sciences, São Paulo State University, Jaboticabal, SP, Brazil
| | | | - Alexandre Rossetto Garcia
- Embrapa Pecuária Sudeste, Rodovia Washington Luiz, Km 234 s/nº, Fazenda Canchim, Caixa Postal: 339, CEP: 13560-970, São Carlos, SP, Brazil
| | - Sergio Novita Esteves
- Embrapa Pecuária Sudeste, Rodovia Washington Luiz, Km 234 s/nº, Fazenda Canchim, Caixa Postal: 339, CEP: 13560-970, São Carlos, SP, Brazil
| | - Felipe Zandonadi Brandão
- Faculdade de Veterinária, Universidade Federal Fluminense, Rua Vital Brasil Filho, 64, CEP 24230-340, Niterói, RJ, Brazil
| | | | - Maria Emilia Franco Oliveira
- Department of Pathobiology and Veterinary Theriogenology, School of Agricultural and Veterinarian Sciences, São Paulo State University, Jaboticabal, SP, Brazil; Embrapa Caprinos e Ovinos, Rodovia MG 133, Km 42, Cep 36.155-000, Coronel Pacheco, MG, Brazil.
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Esteves SN, Penteado MDVC, Ortolani EL, Sinhorini IL. Alimentação de bezerros com extrato hidrossolúvel de soja. II. Produção de anticorpos e distúrbios intestinais. Braz J Vet Res Anim Sci 1996. [DOI: 10.11606/issn.2318-3659.v33isupl.p286-289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
O objetivo do trabalho foi avaliar a substituição total do sucedâneo lácteo à base de proteína de leite (SL) por extrato hidrossolúvel de soja (EHS) na alimentação de bezerros Holandeses machos, com idade média inicial de cinco dias. Os bezerros alimentados com EHS a partir do 5° dia de vida apresentaram, com o desenvolver do experimento, perda de peso pronunciada, diarréia, letargia, caquexia e, nos estágios terminais, desidratação e hipoproteinemia. Apresentaram, ainda, atrofia das vilosidades intestinais e produção de anticorpos no soro contra a proteína do EHS, indicação de que os bezerros estavam padecendo de uma reação alérgica à proteína de soja, enquanto os bezerros do grupo-controle apresentaram-se com desenvolvimento corporal normal. Os bezerros alimentados com EHS apresentaram diminuição visível das gorduras presentes no tecido subcutâneo, omento, epíplon e da gordura perirenal.No abomaso, a principal alteração verificada foi a falta de formação do coágulo do EHS ingerido.
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Esteves SN, Penteado MDVC, Ortolani EL. Alimentação de bezerros com extrato hidrossolúvel de soja. I. Desenvolvimento e digestibilidade. Braz J Vet Res Anim Sci 1995. [DOI: 10.11606/issn.1678-4456.bjvras.1994.52094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
O objetivo do trabalho foi avaliar a substituição total do sucedâneo lácteo à base de proteína de leite (SL) por extrato hidrossolúvel de soja (EHS) na alimentação de bezerros holandeses machos, com idade média inicial de cinco dias. O experimento constou de três tratamentos, conduzidos durante o período de aleitamento dos animais (5º. ao 90º. dia de vida dos animais). O tratamento I consistiu no fornecimento de SL do 5º. ao 90° dia de idade dos bezerros. No tratamento II foi fornecido SL até o 29º. dia de idade e do 30º. ao 90º. dia, EHS. No tratamento III foi fornecido EHS a partir do 5º. dia de idade. Após este período, os bezerros foram desaleitados e continuaram a receber feno e ração da mesma forma que no período de aleitamento, até os 180 dias de idade. No período de aleitamento, os animais do tratamento II apresentaram significativamente (P<0,05) menor consumo de alimentos, menores coeficientes de digestão aparente dos nutrientes e ganho de peso diário inferior ao dos animais do tratamento I. No tratamento III os bezerros apresentaram, com o desenvolver do experimento, perda de peso, sinais de debilidade no estado corpóreo e foram sacrificados.
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