Effects of Birth Weight and Daily Weight Gain during Lactation on Future Milk Production of Holstein Dairy Cows
The aim of this study was to investigate the effects of birth weight and daily weight gain during lac-tation on future milk production of Holstein dairy cows.In this study,1 517 440 daily milk production records,62 094 calving difficulty score records and 45 060 birth and weaning weight records were collected from 5 ten-thousand scale Holstein dairy cattle farms in China during 2019-2022.The general linear model(GLM)process of SAS 9.1 software was used to analyze the variance of factors affecting daily milk production,inclu-ding calving season,parity,birth weight,daily weight gain during lactation,lactation stage,sire and the inter-action between parity with birth weight and daily gain during lactation.The least square means of different birth weights and daily gain during lactation corresponding to the daily milk production of all future parities were ob-tained,and Bonferroni multiple comparisons were conducted.The results showed as follows:1)the calving season,parity,birth weight,daily weight gain during lactation,lactation stage,sire and the interaction be-tween parity with birth weight and daily weight gain during lactation had extremely significant effects on daily milk production(P＜0.01).2)With the increase of birth weight,the daily milk production of each parity showed an upward trend,and the future daily milk production of calves was better when the birth weight was 44 to 48 kg,but the eutocia rate of adult cows was significantly decreased when the birth weight was≥46 kg.3)When the daily weight gain during lactation was 800 to 850 g,the future daily milk production of each pari-ty was significantly higher than that of the other levels of daily weight gain during lactation(P＜0.05).In con-clusion,when the birth weight of Holstein dairy calves is 44 to 46 kg and the daily weight gain during lactation is 800 to 850 g,the future daily milk production can be improved.[Chinese Journal of Animal Nutrition,2024,36(4):2425-2433]
Holstein dairy cowsbirth weightdaily weight gain during lactationmilk production
万方数据
维普
