Short Communication: Correlated Selection Responses in Somatic Cell Count from Selection Against Clinical Mastitis
Short Communication: Correlated Selection Responses in Somatic Cell Count from Selection Against Clinical Mastitis
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DOI：
10.3168/jds.2008-1330
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发表时间：
2008-11-01
影响因子：
3.5
通讯作者：
Steine, T.
中科院分区：
文献类型：
--
作者：
Heringstad, B.;Sehested, E.;Steine, T.
相关的选择反应，在泌乳期平均体细胞评分（LSCS）的奶牛组选择高蛋白质产量和低乳腺炎的频率，分别估计。选择增加产奶量导致LSCS的不利相关反应，而对临床型乳腺炎的直接选择导致有利的相关选择反应。6代奶牛后，高蛋白质产量组和低乳腺炎组之间的遗传差异为0.3单位LSCS，相当于体细胞计数差异约为15，000，假设群体平均LSCS偏差为4.1。
Correlated selection responses in lactation mean somatic cell score (LSCS) were estimated for groups of cows selected for high protein yield and low mastitis frequency, respectively. Selection for increased milk production resulted in an unfavorable correlated response for LSCS, whereas direct selection against clinical mastitis resulted in a favorable correlated selection response. After 6 cow generations, the genetic difference between the high protein yield group and the low mastitis group was 0.3 units LSCS, equivalent to a difference in somatic cell count of approximately 15,000, assuming deviations from a population mean LSCS of 4.1.