Wenninger A, Distl O
Institut für Tierzucht und Tierhygiene, Universität München.
Dtsch Tierarztl Wochenschr. 1993 Oct;100(10):405-10.
In total, records of 915 cows of the breed German Simmental and German Brown were available to investigate the influences of herd, month, lactation number, stage of lactation, milk production, diseases at calving, breed-Brown-Swiss blood proportion and additive-genetic effect of the cow on milk urea and acetone content. Significant differences between herds, months and lactation numbers could be shown for milk urea and acetone content. Acetone content decreased significantly in the first 100 days post partum by 0.06 mmol/l. Milk fat content was significantly correlated with milk urea and acetone. The heritabilities for milk urea were estimated in German Simmental cows as h2 = 0.06 +/- 0.04 and in German Brown cows as h2 = 0.25 +/- 0.11. Using milk samples up to 50 days post partum, heritability estimates were between h2 = 0.10 +/- 0.09 and h2 = 0.17 +/- 0.12 in German Simmental cows.
总共获得了915头德国西门塔尔牛和德国褐牛的记录，用于研究牛群、月份、泌乳次数、泌乳阶段、产奶量、产犊时的疾病、品种-瑞士褐牛血统比例以及奶牛的加性遗传效应对牛奶尿素和丙酮含量的影响。牛奶尿素和丙酮含量在牛群、月份和泌乳次数之间存在显著差异。产后前100天，丙酮含量显著下降0.06 mmol/l。乳脂含量与牛奶尿素和丙酮显著相关。德国西门塔尔牛的牛奶尿素遗传力估计为h2 = 0.06 ± 0.04，德国褐牛为h2 = 0.25 ± 0.11。使用产后50天内的牛奶样本，德国西门塔尔牛的遗传力估计值在h2 = 0.10 ± 0.09和h2 = 0.17 ± 0.12之间。
