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Dong L, Tan C, Cai G, Li Y, Wu D, Wu Z. Estimates of variance components and heritability using different animal models for growth, backfat, litter size, and healthy birth ratio in Large White pigs. CANADIAN JOURNAL OF ANIMAL SCIENCE 2020. [DOI: 10.1139/cjas-2019-0136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study compared the estimates of variance components using various animal models for Large White pigs. The traits included three production traits, birth weight (BW), age at 100 kg (Age_100), and backfat thickness at 100 kg (BF_100), and two reproduction traits, number of total born (NTB) and the ratio of healthy births (RHB). Five models including or ignoring common litter environmental effects, maternal effects, and the direct-maternal covariance (σam) were used for this study. The results showed that the model including all terms, or including all terms except σam, yielded the best-fitting result. The direct variance and heritability were overestimated when the model ignored all previously listed effects, especially for production traits. When all terms were modeled, the direct heritability estimates ([Formula: see text] ± standard error) were 0.038 ± 0.008, 0.216 ± 0.022, 0.416 ± 0.023, 0.066 ± 0.013, and 0.049 ± 0.007 for BW, Age_100, BF_100, NTB, and RHB, respectively. The common litter effects reached statistical significance for all traits, and maternal heritability reached statistical significance for three production traits. The direct-maternal correlations were negative for all traits but only reached statistical significance for BW. These results indicate that using a more complex model may result in more accurate estimation of variance components in Large White pigs.
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Affiliation(s)
- Linsong Dong
- National Engineering Research Center For Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, People’s Republic of China
- WENS Foodstuff Group Co., Ltd., Xinxing 527400, People’s Republic of China
| | - Cheng Tan
- National Engineering Research Center For Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, People’s Republic of China
- WENS Foodstuff Group Co., Ltd., Xinxing 527400, People’s Republic of China
| | - Gengyuan Cai
- National Engineering Research Center For Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, People’s Republic of China
- WENS Foodstuff Group Co., Ltd., Xinxing 527400, People’s Republic of China
| | - Yalan Li
- WENS Foodstuff Group Co., Ltd., Xinxing 527400, People’s Republic of China
| | - Dan Wu
- WENS Foodstuff Group Co., Ltd., Xinxing 527400, People’s Republic of China
| | - Zhenfang Wu
- National Engineering Research Center For Breeding Swine Industry, College of Animal Science, South China Agricultural University, Guangzhou 510642, People’s Republic of China
- WENS Foodstuff Group Co., Ltd., Xinxing 527400, People’s Republic of China
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Caperna TJ, Shannon AE, Blomberg LA, Stoll M, Ramsay TG. Identification of alpha-1 acid glycoprotein (AGP) as a potential marker of impaired growth in the newborn piglet. Reprod Fertil Dev 2014; 25:1126-33. [PMID: 23174131 DOI: 10.1071/rd12103] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2012] [Accepted: 10/18/2012] [Indexed: 12/14/2022] Open
Abstract
Two studies were conducted to investigate the relationship between circulating levels of haptoglobin and α-1 acid glycoprotein (AGP) and growth in neonatal pigs. Circulating serum AGP, but not haptoglobin, was higher (P<0.001) in newborn runts than average-sized littermates. At 1 and 3 weeks, AGP and haptoglobin were similar among control and runt piglets. To determine the possible association between AGP and growth rate, blood was collected between the first and second day after birth in piglets from 10 average litters. Birthweight was positively correlated with growth rate through 21 days (linear regression correlation coefficient (CC), 0.43 (P<0.006); 0.299 (P<0.003) in males and females, respectively). Plasma AGP at birth was negatively correlated with growth (CC, -0.429 (P<0.006); -0.351 (P<0.01) in males and females, respectively). When AGP was calculated on a per kg birthweight basis, the CC with growth improved by 25 and 34% in males and females, respectively, compared with birthweight alone. Haptoglobin in blood was not correlated with growth. These data suggest that AGP at birth is reflective of growth conditions in utero or fetal maturation and may serve as an early predictive biomarker for pre-weaning growth rate.
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Affiliation(s)
- Thomas J Caperna
- Animal Biosciences and Biotechnology Laboratory, Beltsville Agricultural Research Center, US Department of Agriculture, Agricultural Research Service, 10300 Baltimore Ave, Beltsville, MD 20705, USA
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