Evaluation of the Genetic Relationship between Longevity and Growth, Milk Yield and Fertility Traits in the Sahiwal Breed in Kenya
Benjamin Musyimi Musingi, Leah Mumbi Mahianyu, Dorcas Mutheu Musingi
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引用次数: 0
Abstract
Direct selection for longevity results in improved health and fitness and even milk production of cows. However, longevity is lowly heritable and phenotypic information is obtained at the end of an animal’s life. Traits expressed early in life and which are favorably correlated to longevity can be useful in selecting for this trait. The aim of this study was to estimate genetic correlations between longevity and age at first calving, first lactation calving interval, number of services per conception, first lactation milk yield, and first parity lactation length. Heritability estimates for measures of longevity were also calculated. The measures of longevity were time between birth and last milking in days (Long1), time between first calving and last milking record in months (Long2), number of lactations initiated (Long3), and total number of days in lactation over all lactations (Long4), total milk yield over all lactations (kg) (Long5). A series of five-variate animal models were fitted to estimate the nature and magnitude of genetic and phenotypic correlations between each measure of longevity and the fertility and production traits. Genetic correlations between measures of longevity and age at first calving, calving interval and number of services per conception were negative ranging from −0.14 ± 0.05 to −0.96 ± 0.06, −0.06 ± 0.03 to −0.67 ± 0.08 and −0.02 ± 0.02 to −0.73 ± 0.34, respectively. Correlations between measures of longevity and first lactation milk yield ranged from 0.88 ± 0.01 to 0.97 ± 0.03. Those with first parity lactation length ranged from −0.10 to 0.72. Long1, Long4 and Long5, which measure time between birth and last milking day, total number of days in lactation over all lactations and total milk yield over all lactations (kg), respectively, had the highest heritability estimates. These three could How to cite this paper: Musingi, B.M., Mahianyu, L.M. and Musingi, D.M. (2022) Evaluation of the Genetic Relationship between Longevity and Growth, Milk Yield and Fertility Traits in the Sahiwal Breed in Kenya. Open Journal of Animal Sciences, 12, 16-35. https://doi.org/10.4236/ojas.2022.121002 Received: September 7, 2021 Accepted: November 7, 2021 Published: November 10, 2021 Copyright © 2022 by author(s) and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access B. M. Musingi et al. DOI: 10.4236/ojas.2022.121002 17 Open Journal of Animal Sciences therefore be used to directly select for longevity. Among the traits studied, first lactation milk yield and age at first calving had the highest genetic correlation with measures of longevity. Therefore, first lactation milk yield and age at first calving could, therefore, be used to indirectly select for longevity.
肯尼亚Sahiwal品种寿命与生长、产奶量和育性性状的遗传关系评价
直接选择长寿会改善奶牛的健康和体能,甚至提高产奶量。然而,长寿是低遗传的,表现型信息是在动物生命结束时获得的。在生命早期表达的与长寿有利相关的性状在选择该性状时是有用的。本研究的目的是估计寿命与第一次产犊年龄、第一次泌乳间隔、每次受孕次数、第一次泌乳产奶量和第一次胎次泌乳长度之间的遗传相关性。还计算了寿命测量的遗传率估计。测量寿命的方法是:从出生到最后一次挤奶的时间(天),从第一次产犊到最后一次挤奶的时间(月),开始泌乳的次数(月),以及所有泌乳的总泌乳天数(月),所有泌乳的总产奶量(公斤)(月)。拟合了一系列五变量动物模型,以估计每种寿命测量值与生育力和生产性状之间的遗传和表型相关性的性质和大小。寿命与首次产犊年龄、产犊间隔和每胎胎次之间的遗传相关性分别为负,范围为- 0.14±0.05至- 0.96±0.06、- 0.06±0.03至- 0.67±0.08和- 0.02±0.02至- 0.73±0.34。寿命指标与首次泌乳产奶量的相关性为0.88±0.01 ~ 0.97±0.03。第一胎哺乳期长度为−0.10 ~ 0.72。龙1号、龙4号和龙5号分别测量了从出生到最后一次泌乳的时间、所有泌乳的总泌乳天数和所有泌乳的总产奶量(公斤),遗传力估计最高。Musingi, b.m., Mahianyu, L.M. and Musingi, D.M.(2022)肯尼亚Sahiwal品种寿命与生长、产奶量和育性性状遗传关系的评估。动物科学,12,16-35。https://doi.org/10.4236/ojas.2022.121002收稿日期:2021年9月7日收稿日期:2021年11月7日出版日期:2021年11月10日版权所有©2022作者与科研出版公司本作品采用知识共享署名国际许可协议(CC BY 4.0)。http://creativecommons.org/licenses/by/4.0/ Open Access b.m. Musingi等。DOI: 10.4236/ojas.2022.121002 17开放动物科学杂志因此被用来直接选择长寿。在研究的性状中,首次泌乳量和首次产犊年龄与寿命的遗传相关性最高。因此,首次泌乳产奶量和首次产犊年龄可以间接选择长寿。
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