Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (3): 1180-1188.doi: 10.11843/j.issn.0366-6964.2025.03.019

• Animal Genetics and Breeding • Previous Articles     Next Articles

Analysis of Influencing Factors and Estimation of Genetic Parameters on Daily Rumination Time and Daily Milk Yield in Holstein Cows

WANG Zichen1(), ZHANG Na1, ZHANG Wanting1, ZHU Hao1, LU Xubin1, TIAN Yu2, GE Jiwen2, WANG Yongkuan2, CHEN Yuhai2, WANG Yachun3, YANG Zhangping1, MAO Yongjiang1,*()   

  1. 1. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
    2. Nanjing Weigang Dairy Co., Ltd., Nanjing 211113, China
    3. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
  • Received:2024-09-09 Online:2025-03-23 Published:2025-04-02
  • Contact: MAO Yongjiang E-mail:shirleywang2020@126.com;cattle@yzu.edu.cn

Abstract:

The aim of this study was to investigate the analysis of influencing factors and the estimation of genetic parameters of daily rumination time and daily milk yield of Holstein cows. Daily rumination time and daily milk yield were continuously collected from a pasture in Shandong Province from December 2022 to December 2023 by intelligent collar recording. Total 271 113 milk and daily rumination data were collected from 1 223 Chinese Holstein dairy cows; the effects of season, parity, lactation stage and temperature and humidity index (THI) on daily rumination time and daily milk yield were analyzed using a general linear model in SPSS Ver26.0 software; the maximum likelihood component estimates of each trait (covariate) were obtained based on the AI-REML module of DMU software, and the rumination time and daily milk genetic analysis of Holstein cows at different lactation stages were performed with the multi-trait repeatability animal model. It showed that the average daily rumination time was (523.4±82.66) min·d-1 and the average daily milk production was (39.58±10.76) kg·d-1. Different seasons, parity, lactation stages and THI had significant effects on rumination time and daily milk production. The heritability estimates of rumination time at different lactation stages ranged from 0.02 to 0.17, belonging to medium and low heritability traits; except for 101-200 days, the estimated heritability of daily milk production at different lactation stages ranged from 0.13-0.53, which belonged to medium to high heritability traits. In addition, the daily rumination time and daily milk yield had strong genetic correlation (0.45-0.99) at 5-40, 41-100 and 101-200 d period, and strong phenotypic correlation (0.59-0.99) at 5-40 and 41-100 d period. The rumination time collected by collar is a moderate heritability trait and has certain correlation with milk production traits. Strengthening the selection of rumination time can provide a new direction for the selection and breeding of milk production traits.

Key words: Holstein cows, daily rumination time, daily milk yield, genetic analysis

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