China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (9): 3368-3377.doi: 10.16431/j.cnki.1671-7236.2021.09.028

• Genetics and Breeding • Previous Articles     Next Articles

Population Characteristic of Dry Period Length and Its Relationship with Production Performance in Chinese Holstein Cattle

NING Jingyang1, MA Longgang1,2, CHEN Ziwei1, AN Tao1,2, CHANG Yao1, WANG Kai1, WANG Lei1,2, CHEN Shaokan3, ZHANG Fan1,2, GUO Gang3, ZHANG Hailiang1, WANG Yachun1   

  1. 1. Key Laboratory of Animal Genetics, Breeding and Reproduction(MARA), National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    2. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    3. Beijing Sunlon Livestock Development Co., Ltd., Beijing 100176, China
  • Received:2021-04-04 Online:2021-09-20 Published:2021-09-17

Abstract: The aim of this study was to explore the population characteristics of the dry period length (DPL) and its impacts on the production performance in Chinese Holstein cattle in Beijing, including milk production, reproduction performance, colostrum quality and udder health. In this study, dry dates, production performance records and reproduction records from 136 231 Chinese Holstein cattles born between 2009 to 2018 were collected from 34 herds in Beijing. Based on dry dates recorded from these farms, the population characteristic of DPL of the 1st and 2nd parity were revealed. A fixed effect model was used to analyze the impacts of parity, calving season, herd-calving year and age at first calving on DPL. Furthermore, a fixed model was employed to analyze the impacts of variation in DPL on test-day milk yield, fat percentage, protein percentage, interval from the first to last inseminations (IFL), interval from calving to first inseminations (ICF) and colostrum quality. Logistic regression model was used to analyze the impacts of variation in DPL on conception rate of first insemination (CR), 56-days non-return rate for first insemination (NRR56), calving ease and udder health. It was found that the average DPL was 58.81 d in Chinese Holstein cattle in Beijing, and parity, calving season, herd-calving year and age at first calving had significant impacts on DPL (P<0.05). The variation of DPL had significant effects on daily milk yield, milk protein rate, ICF, CR, NRR56, dystocia rate and breast health (P<0.05). The cows with short DPL had higher test-day milk protein percentage, CR and NRR56. The cows with moderate DPL had better test-day milk yeild and udder health, shorter ICF and lower dystocia risk. This study revealed the population pattern of DPL of Chinese Holstein cattle by using large-scale herd data in China, and could provide reference for improving the management level of large-scale dairy farms in China.

Key words: dairy cattle; dry period length(DPL); milk production performance; reproductive performance; colostrum quality; udder health

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