Analysis of Factors Affecting Lactation Performance of Jersey Cows in Zhejiang Province
In order to explore the effects on the lactation performance of Jersey cows,this study used a general linear model(GLM)to analyze the 11 250 DHI data from 2020 to 2023 in a Jersey cows farm in Zhejiang Province.The results showed that parities,months,calving seasons and lactation stages all had highly significant effects on the daily milk yield,milk composition and SCS of Jersey cows(P<0.01).First calving cows,measurement in June,summer calving and end of lactation Jersey cows had the lowest daily milk yield.SCS and milk urea nitrogen(MUN)were highest in Jersey cows with 3th parity or more parities.Higher milk fat content(FC)and protein content(PC)in 2th parity cows,summer calving,late lactation and end of lactation.SCS was highest in 3th parity or more parities,summer calving,late lactation,and end of lactation.The highest MUN was found in the milk of Jersey cows with 3th parity or more parities,summer calving,and measurement in February and mid-lactation.In addition,daily milk yield was highly significantly negatively correlated with FC,PC and SCS.As can be seen from the above,parity,month,calving season,and lactation stage are all important factors that affect Jersey's lactation performance and should be paid attention in dairy production.
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万方数据
