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优化选择策略,提高印度杂交山羊的繁殖效率,以产奶量作为选择标准。

Optimizing selection strategy for enhancing reproduction efficiency in Indian crossbred goats using milk productivity as a selection criterion.

机构信息

Animal Genetics and Breeding Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.

Animal Genetics and Breeding Unit, University of New England, Armidale, New South Wales, Australia.

出版信息

Reprod Domest Anim. 2024 Jan;59(1):e14508. doi: 10.1111/rda.14508. Epub 2023 Nov 27.

Abstract

The present study was aimed at optimizing the selection strategy for enhancing reproductive efficiency and milk productivity of Alpine × Beetal crossbred goats. The data set included 2949 milk trait records across parities and 1389 milk records from first parity and corresponding reproductive traits. The traits included for analysis were 150-day milk yield (150DMY), days in milk (DIM), peak yield (PY) and total milk yield (TMY). The litter size (LS) and litter weight (LW) were used for specifically formulating selection plan using indirect selection. The least squares mean for lactation traits during the first parity were 150DMY: 195.32 ± 2.09 kg, DIM: 236.42 ± 3.04 days, PY: 1.82 ± 0.02 kg, TMY: 269.62 ± 4.52 kg. Notably, Alpine × Beetal goats demonstrated genetic superiority pan India for milk productivity as compared to other native goat breeds. The least squares mean for 150DMY across all parities was 236 ± 3.13 kg. An animal model employing average information restricted maximum likelihood was used for (co)variance component estimation to get the genetic parameters. The analysis revealed total heritability estimates for 150DMY, DIM, PY and TMY as 0.18 ± 0.06, 0.04 ± 0.04, 0.12 ± 0.06 and 0.08 ± 0.05, respectively. Repeatability estimates for 150DMY, DIM, and TMY were 0.28 ± 0.04, 0.21 ± 0.03 and 0.37 ± 0.03, respectively. Bivariate analysis of 150DMY with reproductive traits revealed heritability for LS and LW as 0.05 ± 0.01 and 0.10 ± 0.01, respectively using Gibbs sampling. Strong and positive genetic correlations of 150DMY with other production and reproduction traits was observed, such as DIM (0.72), PY (0.98), TMY (0.88), LS (0.57) and LW (0.33). Moderate heritability and repeatability estimate of 150DMY, along with its positive correlation with production and reproductive traits suggested it as a suitable selection criterion for early selection and overall genetic progress of lactation traits. The genetic trend analysis showed an overall improvement in all these traits, with observed gain of 98.4 g per year for 150DMY, 0.04 days per year for DIM, 0.5 g per year for PY and 220.5 g per year for TMY. We observed that selecting based on 150DMY would lead to a favourable indirect improvement for LW as 79 g and LS 0.04 units per generation. We, therefore, recommend employing 150DMY as the single trait selection criteria to enhance both milk productivity and reproductive potential of Alpine × Beetal goats.

摘要

本研究旨在优化选择策略,以提高阿尔卑斯山×贝塔尔杂交羊的繁殖效率和牛奶产量。数据集包括 2949 个产奶量记录,涉及多个产次,以及 1389 个第一产次的产奶记录和相应的繁殖性状记录。分析的性状包括 150 天产奶量(150DMY)、产奶天数(DIM)、产奶高峰(PY)和总产奶量(TMY)。通过间接选择,使用 litter size(LS)和 litter weight(LW)来专门制定选择计划。第一产次的泌乳性状的最小二乘均值为 150DMY:195.32±2.09kg、DIM:236.42±3.04 天、PY:1.82±0.02kg、TMY:269.62±4.52kg。值得注意的是,与其他本地山羊品种相比,阿尔卑斯山×贝塔尔羊在产奶量方面具有全印度的遗传优势。所有产次的 150DMY 的最小二乘均值为 236±3.13kg。采用平均信息限制最大似然法的动物模型用于(协)方差成分估计,以获得遗传参数。分析结果显示,150DMY、DIM、PY 和 TMY 的总遗传力估计值分别为 0.18±0.06、0.04±0.04、0.12±0.06 和 0.08±0.05。150DMY、DIM 和 TMY 的重复力估计值分别为 0.28±0.04、0.21±0.03 和 0.37±0.03。150DMY 与繁殖性状的双变量分析显示,LS 和 LW 的遗传力分别为 0.05±0.01 和 0.10±0.01,使用 Gibbs 抽样。150DMY 与其他生产和繁殖性状的遗传相关性很强且为正相关,如 DIM(0.72)、PY(0.98)、TMY(0.88)、LS(0.57)和 LW(0.33)。150DMY 的遗传力和重复力估计值适中,与生产和繁殖性状呈正相关,表明其可作为泌乳性状早期选择和整体遗传进展的合适选择标准。遗传趋势分析显示,所有这些性状都有了整体改善,150DMY 的年观察增益为 98.4g,DIM 的年观察增益为 0.04 天,PY 的年观察增益为 0.5g,TMY 的年观察增益为 220.5g。我们发现,基于 150DMY 的选择将导致 LW 和 LS 的间接改善,每代分别为 79g 和 0.04 个单位。因此,我们建议采用 150DMY 作为单一性状选择标准,以提高阿尔卑斯山×贝塔尔羊的产奶量和繁殖潜力。

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