China Dairy ›› 2021, Vol. 0 ›› Issue (7): 32-38.doi: 10.12377/1671-4393.21.07.06

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Research on Dairy Cow Reproduction and Milk Production Performance in different months from 18 provinces of China in 2020

XU Wei1, DONG Fei1, ZHANG Saisai1, JIANG Xinggang2, REN Dequan3, MA Zhifen1,4,*   

  1. 1EYIMU Science and Technology (Beijing) Co., Ltd., Beijing 100016;
    2Branch of Animal Husbandry and Veterinary of Heilongjiang Academy of Agricultural Sciences, Qiqihar; Heilongjiang 161005;
    3Animal Husbandry Station of Hailar District of Hulun Buir, Hulun Buir Inner Mongolia 021008;
    4Beijing Institute of animal husbandry and veterinary medicine, Chinese Academy of Agricultural Sciences, Beijing 100193
  • Online:2021-07-25 Published:2021-08-10

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Abstract: The objectives of current study were to ensure the performance of dairy cow reproduction and milk production in different months,by analyzing 201 scaled dairy farms' monthly reproduction and production data from 18 provinces of China in 2020.Results showed that: (1) Cows' conception rate and pregnancy rate began to decline in May and June,decreased significantly in July and August,but remained low in September. From July to September, second and more than second parity cows'conception rate was significantly lower than first parity (average 4.3 to 5.1 percentage points lower);(2) Heifers' pregnancy rate and conception rate were relatively stable within 12 months,and no significant decrease from June to August;(3) After June,lactating cows' yield decreased slowly with an average around 0.50 to 0.90 kg,peak yield decreased obviously after June.Peak yield was largely decline in multiparous cows and less decline in primiparous cows.Therefore, in order to reduce the influence of heat stress on dairy cows' production performance in different months and improve the production performance of dairy cows,it is suggested that the dairy farms in different areas should take measures to prevent heat stress,optimize breeding program and improve nutrition and feeding management.

Key words: dairy cow, conception rate, milk yield, temperature, heat stress

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