Teodoro R L, Madalena F E
EMBRAPA-Dairy Cattle, Juiz de Fora, MG, Brazil.
Trop Anim Health Prod. 2003 Apr;35(2):105-15. doi: 10.1023/a:1022869301192.
The performance was compared of cows sired by Holstein, Jersey or Brown Swiss bulls out of Holstein-Friesian x Gir dams of 1/2 to 3/4 Holstein-Friesian content. The animals were kept in a single herd under the same management. The data were analysed by least-squares techniques under a model that included the fixed effects of breed of sire. Bos taurus fraction of the dam, parity, year and season of calving, and a random cow effect. Based on 480 observations, the milk yields per lactation for the Holstein, Jersey and Brown Swiss sired groups were 2,821 +/- 163, 2,320 +/- 61 and 2,418 +/- 119 kg, respectively. The corresponding means for fat yield per lactation were 96.9 +/- 6.6, 86.8 +/- 2.5 and 92.8 +/- 4.8 kg; for protein yield per lactation were 85.3 +/- 5.1, 71.3+/-1.9 and 76.3 +/- 3.7 kg; for lactation length, 339 +/- 18, 283 +/- 7 and 313 +/- 14 days for fat percentage. 3.37 +/- 0.10, 3.73 +/- 0.04 and 3.77 +/- 0.07%; and for protein percentage, 3.02 +/- 0.05, 3.10 +/- 0.02 and 3.16 +/- 0.04%. The respective calving intervals were 487 +/- 24, 408 +/- 11 and 461 +/- 245 days. The yields of milk and protein per day of calving interval were similar in the Jersey and Holstein sired groups, while the former had higher yields of fat, implying that production economics might favour the smaller Jersey crosses in production systems in which the males were not reared. Crossing with Brown Swiss did not improve performance over the Holstein sired crosses.
对荷斯坦、泽西或瑞士褐牛公牛所生的奶牛进行了性能比较，这些奶牛的母亲是荷斯坦 - 弗里生牛与吉尔牛的杂交后代，荷斯坦 - 弗里生牛含量为1/2至3/4。这些动物饲养在同一牛群中，管理方式相同。数据采用最小二乘法技术进行分析，分析模型包括父本品种、母牛的 Bos taurus 比例、胎次、产犊年份和季节等固定效应，以及随机的母牛效应。基于480个观测值，荷斯坦、泽西和瑞士褐牛所生群体每泌乳期的产奶量分别为2,821±163、2,320±61和2,418±119千克。每泌乳期相应的脂肪产量均值分别为96.9±6.6、86.8±2.5和92.8±4.8千克；蛋白质产量均值分别为85.3±5.1、71.3±1.9和76.3±3.7千克；泌乳期长度分别为339±18、283±7和313±14天；脂肪百分比分别为3.37±0.10、3.73±0.04和3.77±0.07%；蛋白质百分比分别为3.02±0.05、3.10±0.02和3.16±0.04%。各自的产犊间隔分别为487±24、408±11和461±245天。泽西和荷斯坦所生群体每产犊间隔日的牛奶和蛋白质产量相似，而前者的脂肪产量较高，这意味着在不饲养公牛的生产系统中，较小的泽西杂交牛在生产经济性方面可能更具优势。与瑞士褐牛杂交并没有比荷斯坦所生的杂交牛在性能上有更好的表现。
