| 摘要: |
| 利用陕西西安现代农业综合开发区4个奶牛场253头荷斯坦牛2000～2005年的7 082份DHI记录中的体细胞计数（SCC）,分析了胎次、产犊季节和泌乳阶段对荷斯坦牛体细胞评分（SCS）的影响,并分析了不同牛场间SCS的差异.结果表明,SCS在不同牛场、不同胎次、不同产犊季节和不同泌乳阶段均存在显著差异,且这些因素相互作用对SCS有极显著影响,3场的SCS显著低于其他牛场；6～9月份平均SCS最高,5月份和10月份次之,其他月份较低;随胎次及泌乳月份的增加,SCS呈增加趋势. |
| 关键词: 体细胞评分 奶牛 体细胞计数 胎次 产犊季节 泌乳阶段 |
| DOI： |
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| 基金项目:陕西省科技重点研究发展计划项目（2006ZK07-G1）；西北农林科技大学拔尖人才支持计划项目 |
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| Effect of season parity and lactation stages on SCS in different dairy farms of Chinese Holstein |
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| Abstract: |
| The aim of this study was to analyze the factors affecting somatic cell score(SCS) which is an indirect criterion to assess susceptibility to mastitis.DHI records (7 082 SCC) of 253 Holstein cattle from 4 dairy farms were grouped into 4 factors,3 levels according to months of calving,and 7 levels according to parities,and 4 lactation stages(＜65 d，66-150 d，151-225 d,＜225 d after calving).The mean SCS was analyzed at all the levels. The mean SCS of dairy farm 1 was significantly different from that of the other dairy farms.The mean SCS was higher from June to September, and decreased in May and Octomber and was lowest in the following months.The mean SCS increased as parities and lactation stage extending.The interaction of the four factors significantly affects the mean SCS.The mean SCS was significantly diffetent in the four factors. |
| Key words: somatic cell score (SCS),dairy cattle,somatic cell count(SCC),parity,calving season,lactation stage |
