新疆地区荷斯坦牛乳中体细胞评分对产奶量与乳成分的影响

doi:10.16431/j.cnki.1671-7236.2019.11.022

Abstract

Abstract: In order to explore the relationship between daily milk yield (DMY)and milk composition of somatic cell score (SCS) in milk,and to understand the health status of dairy cows' breasts,in this study,33 290 DHI records and production performance data of 2 338 Holstein cattle in Changji area,Xinjiang were used to analyze the effect of SCS on daily milk yield and milk composition after converting SCC recorded by DHI into SCS.The least square variance analysis and multiple comparison of milk yield and milk composition were carried out by using SAS 9.2 software,and the correlation between SCS and DMY and milk composition was analyzed.The fixed effects mainly included SCS,field,year,season and parity effect.The results showed that the factors of SCS,field,year,seasonal and parity had significant effects on DMY and milk composition (P<0.01).With the increase of SCS,the DMY and milk lactose percentage (MLP) decreased.When SCS was 0 and SCC was 9×10³ to 17×10³,the DMY and MLP were extremely significantly higher than those of other SCS levels (P<0.01).The milk fat percentage (MFP) and milk protein percentage (MPP) showed an upward trend with the increased of SCS,and when SCS was 9 and SCC was 4 529×10³ to 4 904×10³,the MFP and MPP were highest.The results of correlation analysis showed that SCS,field,year,season and parity all had extremely significant effects on daily milk yield and milk composition (P<0.01);There was a extremely significant negative correlation between SCS and DMY,MLP (P<0.01),while SCS was extremely significantly positively correlated with MFP and MPP (P<0.01).Therefore,by analyzing the relationship between DMY,milk composition and SCS,it could provide scientific basis for daily management of large-scale dairy cows and prevent and reduce the risk of mastitis.

Key words: somatic cell score (SCS); number of somatic cells (SCC); milk yield; milk composition; Holstein cattle

CLC Number:

S823

ZHAO Fanfan, GE Janju, LI Hongyan, ZHANG Menghua, WEI Chen, WANG Dan, DU Jianwen, XU Lei, JIANG Hui, SANG Zhagen, HUANG Xixia, TAN Shixin. Effects of Somatic Cell Score on Milk Yield and Milk Composition in Holstein Milk in Xinjiang[J]. China Animal Husbandry and Veterinary Medicine, 2019, 46(11): 3323-3331.

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Effects of Somatic Cell Score on Milk Yield and Milk Composition in Holstein Milk in Xinjiang

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