Genetic parameters for milk somatic cell score and relationship with production and udder type traits in dairy Alpine and Saanen primiparous goats
Genetic parameters for milk somatic cell score and relationship with production and udder type traits in dairy Alpine and Saanen primiparous goats
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DOI：
10.3168/jds.2010-3694
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发表时间：
2011-07-01
影响因子：
3.5
通讯作者：
Manfredi, E.
中科院分区：
文献类型：
--
作者：
Rupp, R.;Clement, V.;Manfredi, E.
法国国家牛奶记录组织已收集山羊奶体细胞数多年。信息用于健康管理;因为体细胞计数反复升高是乳房内感染的良好间接预测因素。分别对67，882只和49，709只产奶高山山羊和萨宁山羊的遗传参数进行了估计，并获得了乳体细胞计数和产奶性状的完整信息。大约40%的山羊具有由育种者协会CAPGENES的官方分类器评分的11个乳房类型性状的额外信息。通过REML使用动物模型获得估计值。所研究的性状是哺乳期体细胞评分（LSCS），体细胞评分的加权平均值（对数转换SCC）调整哺乳期阶段。阿尔卑斯和萨宁猪LSCS的遗传力分别为0.20和0.24。与产奶量和乳房类型性状的关系，另外估计使用多性状分析。在第一次哺乳期的遗传力估计范围从0.30至0.35泌乳牛奶，脂肪和蛋白质产量从0.60至0.67脂肪和蛋白质含量从0.22至0.50乳房类型性状。体细胞评分与产奶性状的遗传相关性一般较低，在-0.13到0.12之间。脂肪含量的负相关性略高：萨宁和阿尔卑斯品种分别为-0.18和-0.20。哺乳期体细胞评分与乳房底位置（阿尔卑斯和萨宁品种的r（g）分别为-0.24和-0.19）以及萨宁品种的乳头长度、乳头宽度和乳头形状（r（g）分别为0.29、0.34和-0.27）存在遗传相关性。这些结果表明，体细胞计数的减少可以通过选择实现，同时仍然改善产奶量和乳房类型和乳头性状。
Goat milk somatic cell counts have been collected for several years in France by the national milk recording organization. Information is used for health management; because repeatedly elevated somatic cell counts are a good indirect predictor of intramammary infection. Genetic parameters were estimated for 67,882 and 49,709 primiparous goats of the dairy Alpine and Saanen breeds, respectively, with complete information for milk somatic cell counts and milk production traits. About 40% of the goats had additional information for 11 udder type traits scored by official classifiers of the breeders' association CAPGENES. Estimates were obtained by REML with an animal model. The studied trait was lactation somatic cell score (LSCS), the weighted mean of somatic cell score (log-transformed SCC) adjusted for lactation stage. Heritability of LSCS was 0.20 and 0.24 in the Alpine and Saanen breeds, respectively. Relationships with milk production and udder type traits were additionally estimated by using multitrait analyses. Heritability estimates in first lactation ranged from 0.30 to 0.35 for lactation milk, fat, and protein yields; from 0.60 to 0.67 for fat and protein contents; and from 0.22 to 0.50 for udder type traits. Genetic correlations of somatic cell score with milk production traits were generally low, ranging from -0.13 to 0.12. Slightly more negative correlations were estimated for fat content: -0.18 and -0.20 in Saanen and Alpine breeds, respectively. Lactation somatic cell score was genetically correlated with udder floor position (r(g) = -0.24 and -0.19 in the Alpine and Saanen breeds, respectively), and, in Saanen, teat length, teat width, and teat form (r(g) = 0.29, 0.34 and -0.27, respectively). These results suggest that a reduction in somatic cell count can be achieved by selection while still improving milk production and udder type and teat traits.