China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (1): 200-208.doi: 10.16431/j.cnki.1671-7236.2021.01.022

• Genetics and Breeding • Previous Articles     Next Articles

Analysis of Culling Characteristics and Influencing Factors of Longevity in Holstein Cows in Ningxia

ZHANG Hailiang1, CHEN Ziwei1, SHI Rui1, TIAN Jia2, GAO Xuhong2, WEN Wan2, WANG Yachun1   

  1. 1. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    2. The Ningxia Hui Autonomous Region Animal Husbandry Station, Yinchuan 750004, China
  • Received:2020-06-28 Online:2021-01-20 Published:2021-01-15

Abstract: The objective of this study was to explore general characteristics of individual culling and analysis the influencing factors of longevity in Holstein cows in Ningxia.Descriptive statistics for productive life,herd life and lactation number in 15 523 Holstein cows were obtained,and culling characteristics under different culling parities,culling seasons and culling lactation stages were analyzed.Secondly,phenotypic correlations among productive life,herd life and lactation number were calculated,and a fixed model was adopted to assess the impacts of herd-birth year,birth season,herd size,culling reason and first calving age on longevity of Holstein cows.The results showed that the average utilized parity was about 2.36,the average productive life of Holstein cows was 736.59 d in Ningxia.There was the highest culling risk in the first month after birth of Holstein cows.With the increase of lactation stage,culling risk of cows gradually decreased within each lactation.With the increase of the culling parity,the culling of dairy cows was more concentrated in the early stage of postpartum lactation.There were high phenotypic correlations (>0.9) among productive life,herd life and lactation.Herd birth year,birth season,herd scale,culling reason and the first calving age had significant effects on longevity (P<0.05).This study initially revealed culling characteristics of Holstein cows and influencing factors of longevity in Ningxia,which laid the foundation for the selection of longevity traits in Holstein population in Ningxia.

Key words: dairy cows; herd life; longevity; culling reason

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