Division of Livestock Sciences, Department of Sustainable Agricultural Systems, University of Natural Resources and Applied Life Sciences, Gregor-Mendel-Str. 33, 1180 Vienna, Austria.
J Dairy Sci. 2010 May;93(5):2185-94. doi: 10.3168/jds.2009-2570.
The objective of this study was to estimate genetic parameters for various reproductive disorders based on veterinary diagnoses for Austrian Fleckvieh (Simmental) dual-purpose cattle. The health traits analyzed included retained placenta, puerperal diseases, metritis, silent heat and anestrus, and cystic ovaries. Three composite traits were also evaluated: early reproductive disorders, late reproductive disorders, and all reproductive disorders. Heritabilities were estimated with logit threshold sire, linear sire, and linear animal models. The threshold model estimates for heritability ranged from 0.01 to 0.14, whereas the linear model estimates were lower, ranging from 0.005 to 0.04. Rank correlations among random effects of sires from linear and threshold sire models were high (>0.99), whereas correlations between any sire model (linear, threshold) and the linear animal model were lower (0.88-0.92). Genetic correlations among reproductive disorders, fertility traits, and milk yield were estimated with bivariate linear animal models. Fertility traits included interval from calving to first insemination, nonreturn rate at 56 d, and interval between first and last insemination. Milk yield was calculated as the mean from test-day 1 and test-day 2 after calving. Estimated genetic correlations were 1 among metritis, retained placenta, and puerperal diseases and 0.85 between silent heat-anestrus and cystic ovaries. Low to moderate correlations (-0.01 to 0.68) were obtained among the other disorders. Genetic correlations between reproductive disorders and fertility traits were favorable, whereas antagonistic relationships were observed between milk yield in early lactation and reproductive disorders. Pearson correlations between estimated breeding values for reproductive disorders and other routinely evaluated traits were computed, which revealed noticeable favorable relationships to longevity, calving ease maternal, and stillbirth maternal. The results showed that data from the Austrian health monitoring project can be used for genetic selection against reproductive disorders in Fleckvieh cattle.
本研究旨在基于奥地利弗莱维赫（西门塔尔牛）兼用牛的兽医诊断来估计各种繁殖障碍的遗传参数。分析的健康性状包括胎衣不下、产后疾病、子宫炎、不发情和乏情以及卵巢囊肿。还评估了三个综合性状：早期繁殖障碍、晚期繁殖障碍和所有繁殖障碍。使用逻辑斯谛门限 sire、线性 sire 和线性动物模型估计遗传力。门限模型估计的遗传力范围为 0.01 至 0.14，而线性模型的估计值较低，范围为 0.005 至 0.04。线性 sire 和门限 sire 模型 sire 随机效应之间的秩相关系数较高（>0.99），而任何 sire 模型（线性、门限）与线性动物模型之间的相关性较低（0.88-0.92）。使用二元线性动物模型估计繁殖障碍、繁殖力性状和产奶量之间的遗传相关性。繁殖力性状包括从产犊到第一次输精的间隔、56 天的返情率以及第一次和最后一次输精的间隔。产奶量为产后第 1 天和第 2 天的平均产奶量。估计的遗传相关性为 1，见于子宫炎、胎衣不下和产后疾病之间，0.85，见于不发情-乏情和卵巢囊肿之间。其他障碍之间的相关性较低（-0.01 至 0.68）。繁殖障碍和繁殖力性状之间的遗传相关性良好，而泌乳早期产奶量与繁殖障碍之间存在拮抗关系。计算了繁殖障碍估计育种值与其他常规评估性状之间的皮尔逊相关系数，结果表明与长寿、分娩容易度母系和死胎母系存在明显的有利关系。结果表明，可以使用奥地利健康监测项目的数据对弗莱维赫牛的繁殖障碍进行遗传选择。
