【摘要】：奶牛體細(xì)胞數(shù)已成為奶牛育種領(lǐng)域高度關(guān)注的性狀之一,其數(shù)量的多少成為奶牛是否罹患乳房炎的重要指標(biāo)。本研究針對(duì)來(lái)自于中國(guó)南方地區(qū)(江、浙、滬)62個(gè)牛場(chǎng)34 150頭奶牛的29萬(wàn)余條DHI數(shù)據(jù),利用隨機(jī)回歸模型估計(jì)體細(xì)胞數(shù)遺傳參數(shù)。分別采用線性、二階、三階spline曲線進(jìn)行比較分析,最后通過(guò)AIC準(zhǔn)則篩選出了最適合中國(guó)南方奶牛群體體細(xì)胞數(shù)遺傳力估計(jì)的隨機(jī)回歸模型,即為二階四節(jié)點(diǎn)spline曲線�；诙A四節(jié)點(diǎn)spline曲線隨機(jī)回歸模型,牛乳中體細(xì)胞計(jì)數(shù)遺傳力估值為0.13~0.51,遠(yuǎn)高于乳房炎本身的遺傳力,因此可以選擇體細(xì)胞數(shù)這一準(zhǔn)確性更高、標(biāo)準(zhǔn)性更強(qiáng)的數(shù)量性狀進(jìn)行選育,進(jìn)而推動(dòng)乳房炎抗性育種的進(jìn)程。
[Abstract]:The number of somatic cells has become one of the most concerned traits in dairy cattle breeding field, and the number of somatic cells has become an important indicator of mastitis in dairy cows. Based on more than 290000 DHI data collected from 62 cattle farms in southern China (Jiangsu, Zhejiang and Shanghai), somatic cell number genetic parameters were estimated by random regression model. The linear, second-order and third-order spline curves were used to compare and analyze respectively. At last, the random regression model of somatic heritability of dairy cattle population in southern China was selected by AIC criterion, that is, the second-order four-node spline curve. Based on the second-order four-node spline curve random regression model, the heritability of somatic cell count in milk was estimated to be 0.130.51, which was much higher than that of mastitis itself. Therefore, the accuracy of selecting somatic cell number was higher than that of mastitis itself. More standardized quantitative traits were selected to promote the breeding process of mastitis resistance.
【作者單位】： 上海交通大學(xué)農(nóng)業(yè)與生物學(xué)院;上海光明荷斯坦牧業(yè)有限公司;上海奶牛育種中心股份有限公司;
【基金】：上海市農(nóng)委科技興農(nóng)攻關(guān)項(xiàng)目(滬農(nóng)科攻字(2012)第2-3號(hào)) 南方大城市奶牛健康養(yǎng)殖生產(chǎn)技術(shù)集成及產(chǎn)業(yè)化示范(2012BAD12B08)
【分類號(hào)】：S823

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