浙江农业学报 ›› 2026, Vol. 38 ›› Issue (3): 460-470.DOI: 10.3969/j.issn.1004-1524.20250230

• 动物科学 • 上一篇    下一篇

长三角地区奶牛泌乳持续力的遗传参数及其与生产繁殖性状的遗传相关性

李天秀1,2(), 卢徐斌2,3, 杨章平2,3, 肖卫明2, 周福振2, 董新星1, 尹彤2,*(), 严达伟1,*()   

  1. 1. 云南农业大学 动物科学技术学院, 云南 昆明 650201
    2. 浙江省奶牛遗传改良与乳品质研究重点实验室, 浙江 温州 325000
    3. 扬州大学 动物科学与技术学院, 江苏 扬州 225009
  • 收稿日期:2025-03-24 出版日期:2026-03-25 发布日期:2026-04-17
  • 作者简介:严达伟,E-mail:1302648630@qq.com
    *尹彤,E-mail:lizyincast@gmail.com;
    李天秀,主要从事奶牛遗传育种研究。E-mail:2668684815@qq.com
  • 通讯作者: 尹彤,严达伟
  • 基金资助:
    浙江省温州市泰顺县农业科技项目(2024TSXM0046)

Estimation of genetic parameters for lactation persistency in dairy cows in the Yangtze River Delta region and analysis of its genetic correlations with production and fertility traits

LI Tianxiu1,2(), LU Xubin2,3, YANG Zhangping2,3, XIAO Weiming2, ZHOU Fuzhen2, DONG Xinxing1, YIN Tong2,*(), YAN Dawei1,*()   

  1. 1. Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
    2. Key Laboratory of Dairy Cattle Genetic Improvement and Milk Quality Research, Zhejiang Province, Wenzhou 325000, Zhejiang, China
    3. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, Jiangsu, China
  • Received:2025-03-24 Published:2026-03-25 Online:2026-04-17
  • Contact: YIN Tong,YAN Dawei

摘要:

本研究旨在探究长三角地区头胎奶牛305 d产奶量和泌乳持续力的遗传参数,以及泌乳持续力与305 d产奶量、青年牛首配受孕率和成年母牛首配受孕率的遗传相关性。采用2个非参数模型、3个参数模型拟合泌乳曲线,预测305 d产奶量,计算泌乳持续力。利用单性状动物模型对头胎奶牛的日产奶量、305 d产奶量、泌乳持续力和繁殖性状进行方差组分估计;利用双性状模型估计泌乳持续力与305 d产奶量、繁殖性状的遗传相关性。研究结果显示:移动均值的泌乳曲线拟合效果最佳;日产奶量(泌乳天数为5~305 d)的遗传力为0.156~0.465;不同拟合模型的305 d产奶量遗传力为0.405~0.437,泌乳持续力的遗传力为0.113~0.238;青年牛首配受孕率和成年母牛首配受孕率的遗传力分别为0.067±0.041和0.023±0.032。泌乳持续力与305 d产奶量、青年牛首配受孕率、成年母牛首配受孕率之间的遗传相关系数分别为0.318~0.808、-0.241~0.408和0.118~0.721;305 d产奶量、成年母牛首配受孕率与泌乳持续力均呈正遗传相关。结果可为奶牛繁殖性能的遗传改良提供参考,为选育优质高产、高繁殖力的奶牛提供方向。

关键词: 奶牛, 日产奶量, 泌乳曲线, 泌乳持续力, 繁殖性状, 遗传参数

Abstract:

This study aimed to investigate the genetic parameters of 305-day cumulative milk yield and lactation persistency in primiparous cows in the Yangtze River Delta region, as well as the genetic correlations between lactation persistency and 305-day milk yield, and first insemination conception rate in heifers and cows. Two nonparametric and three parametric models were used to fit lactation curves, predict 305-day milk yield, and calculate lactation persistency. Variance components were estimated for daily milk yield, 305-day milk yield, lactation persistency, and reproduction traits in first lactation cows using a single-trait animal model. Genetic correlations between lactation persistency traits and 305-day milk yield and reproduction traits were estimated using a bivariate animal model. The rolling mean method displayed the best goodness of fit for lactation curves. Heritability estimates for daily milk yield, recorded between 5 and 305 days of lactation, ranged from 0.156 to 0.465. Heritabilities for 305-day milk yield and lactation persistency traits ranged from 0.405 to 0.437 and 0.113 to 0.238, respectively. For first insemination conception rate, heritability was 0.067 ± 0.041 in heifers and 0.023 ± 0.032 in cows. Genetic correlations between lactation persistency traits and 305-day milk yield, first insemination conception rate in heifers, and first insemination conception rate in cows were 0.318-0.808, -0.241-0.408, and 0.118-0.721, respectively. Both 305-day milk yield and first-service conception rate in mature cows showed positive genetic correlations with lactation persistency. The results demonstrated the potential for genetic improvement of reproduction traits in dairy cow, offering strategies for breeding cows with high productivity and fertility.

Key words: dairy cow, daily milk yield, lactation curve, lactation persistency, reproduction trait, genetic parameter

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