Bell B R, McDaniel B T, Robison O W
J Dairy Sci. 1985 Aug;68(8):2038-51. doi: 10.3168/jds.S0022-0302(85)81066-3.
Pedigrees of 4461 cows were traced to the original female in a maternal line. Cytoplasmic origin was defined as the first female in the maternal lineage. There were 102 cytoplasmic lines. Most cows were at least 10 generations removed from the origin. After adjustment for sire, herd, calving year, calving month, and age, cytoplasmic effects accounted for 2.0, 1.8, 1.8, and 3.5% of total variation of milk yield, milk fat yield, 3.7% fat-corrected milk yield, and milk fat percentage in first lactation. Cytoplasmic effects were also in models that included adjustments for sires, maternal grand-sires, and dam's production. Correlations among independent subsets agreed with expectations. Cytoplasmic origin was a significant source of variation of production traits of dairy cattle.
对4461头奶牛的谱系进行追溯，直至母系中的原始雌性个体。细胞质起源被定义为母系谱系中的第一头雌性个体。共有102个细胞质系。大多数奶牛与起源个体至少相隔10代。在对父系、牛群、产犊年份、产犊月份和年龄进行调整后，细胞质效应对初产泌乳期产奶量、乳脂产量、校正乳脂率产量和乳脂率总变异的贡献率分别为2.0%、1.8%、1.8%和3.5%。细胞质效应也包含在对父系、外祖父系和母亲生产性能进行调整的模型中。独立子集之间的相关性与预期相符。细胞质起源是奶牛生产性状变异的一个重要来源。
