Daley D R, McCuskey A, Bailey C M
J Anim Sci. 1987 Feb;64(2):373-84. doi: 10.2527/jas1987.642373x.
Yield, butterfat, protein, lactose and solids-not-fat of milk from mature dams (n = 128) representing eight Bos taurus and Bos indicus X Bos taurus breed types were evaluated approximately 60, 105 and 150 d postpartum. Breed type was a significant source of variation in milk yield at each stage of lactation. Average 24-h milk yields (kg) were: Hereford, 7.3; Red Poll, 9.1; Hereford X Red Poll, 9.1; Red Poll X Hereford, 9.1; Angus X Hereford, 8.6; Angus X Charolais, 9.3; Brahman X Hereford, 7.3 and Brahman X Angus, 8.3. Daily yields of Brahman X Angus dams increased as lactation progressed, while production levels of other breed types remained approximately the same or declined. Hereford-Red Poll crosses showed significant heterosis in 24-h milk production and component yields at 150 d. Breed type effects also were significant for lactose yield throughout lactation. Sex of calf influenced (P less than .05) milk yield at 60 and 105 d postpartum and yield of protein and solids-not-fat at 105 d. Mastitis caused a reduction (P less than .01) in percentage of lactose but had no effect on milk yield. Residual correlations between yield traits and preweaning average daily gain were all positive and significant, with values ranging from .22 to .45. Breed type was a major source of variation in milk traits of beef-type Bos taurus and Bos indicus X Bos taurus dams.
对代表8种黄牛和瘤牛×黄牛品种类型的成年母牛（n = 128头）产后约60、105和150天的牛奶产量、乳脂、蛋白质、乳糖和非脂固形物进行了评估。品种类型是泌乳各阶段牛奶产量差异的重要来源。24小时平均产奶量（千克）分别为：海福特牛，7.3；红白花牛，9.1；海福特牛×红白花牛，9.1；红白花牛×海福特牛，9.1；安格斯牛×海福特牛，8.6；安格斯牛×夏洛莱牛，9.3；婆罗门牛×海福特牛，7.3；婆罗门牛×安格斯牛，8.3。婆罗门牛×安格斯牛母牛的日产奶量随着泌乳进程增加，而其他品种类型的产奶水平保持大致相同或下降。海福特牛-红白花牛杂交后代在150天时24小时产奶量和成分产量表现出显著杂种优势。品种类型对整个泌乳期的乳糖产量影响也显著。犊牛性别对产后60和105天的产奶量以及105天时的蛋白质和非脂固形物产奶量有影响（P < 0.05）。乳腺炎导致乳糖百分比降低（P < 0.01），但对产奶量无影响。产奶性状与断奶前平均日增重之间的剩余相关性均为正且显著，值范围为0.22至0.45。品种类型是肉用型黄牛和瘤牛×黄牛母牛牛奶性状差异的主要来源。
