›› 2018, Vol. 45 ›› Issue (11): 3167-3175.doi: 10.16431/j.cnki.1671-7236.2018.11.023

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Effects of Calving Season on the Parameters of Wood Lactation Curve of Holstein Dairy Cow in Beijing Area

QI Jiangang1,2, YANG Zhancheng2, LI Xiang2, YAN Xinyi2, DONG Ganghui3, LI Xizhi3, HUANG Xixia1, WANG Yachun2   

  1. 1. College of Animal Science, Xinjiang Agricultural University, Urumqi 830052, China;
    2. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
    3. Beijing Sunlon Animal Husbandry Development Co., Ltd., Beijing 100029, China
  • Received:2018-03-08 Online:2018-11-20 Published:2018-11-20

Abstract:

This study was conducted to compare the effects of calving season on the parameters of lactation curve of Holstein dairy cow for parity 1 to 3 in Beijing 28 farm based on the dairy herd improvement (DHI)data from 1998 to 2016.Wood model was used to fit the lactation curve of parity 1 to 3 in different calving season groups and individuals,and obtain lactation curve parameters of dairy cows in different calving seasons under different parity.Lactation parameters include lactation potential (a),the rate of milk production increased to peak (b),milk production decline rate (c),lactation persistence (Per),lactation peak (PY) and estimated 305 d milk yield (305MY).The NLIN modules in SAS 9.2 were used for fitting Wood model lactation curve at group and individual level.The parameters of Wood curve were analyzed using a mixed linear model.The results showed that the calving season had a significant effect on parameters of lactation curve,derived parameters of PY and 305MY in the Wood lactation curve (P<0.05),but had no significant effect on derived parameters of Per (P>0.05).At the same time,for different calving seasons,the lactation curve of calves produced in summer was lower than that of other calving seasons,and the higher the parity,the more obvious the trend was.The impact on the first parity cow was relatively small.From the analysis of the parity,the first lactation persistence was significantly higher than that of multiple parity cows (P<0.05).In the first parity cow,the 305MY of summer calving was 274.33~490.17 kg lower than that of other calving season cows,while for the delivered cows,it was lower than the other calving seasons by 440.76~930.68 kg.Based on the above analysis results,dairy farms in Beijing should pay more attention to multiple lactation cows and fresh cows to prevent heat stress,while adjust breeding plan to avoid serious loss due to too many cows calving in the summer.

Key words: calving season; Holstein dairy cow; lactation curve; milk yield; lactation peak; lactation persistence

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