Olson T A, Euclides Filho K, Cundiff L V, Koger M, Butts W T, Gregory K E
Dept. of Anim. Sci., Univ. of Florida, Gainesville 32611.
J Anim Sci. 1991 Jan;69(1):104-14. doi: 10.2527/1991.691104x.
Data on 2,744 calves produced in Clay Center, Nebraska and Brooksville, Florida were used to evaluate the importance of genotype x location interactions on the reproductive and maternal performance of eight breed groups of F1 crossbred cows. A total of 648 F1 crossbred cows included Bos taurus x Bos taurus (Bt x Bt) crosses: Hereford x Angus reciprocal crossbreds (HA and AH), Pinzgauer x Angus (PA), Pinzgauer x Hereford (PH); and Bos indicus x Bos taurus (Bi x Bt) crosses: Brahman x Angus (BA), Brahman x Hereford (BH), Sahiwal x Angus (SA) and Sahiwal x Hereford (SH). The first calf crop was sired by Red Poll bulls. All remaining calf crops were sired by Simmental bulls. Although the pregnancy rate was 9% higher in Nebraska, the rate of unassisted calvings and calf survival rate were both 4.6% lower in Nebraska. Calf birth and weaning weights were 8.0 and 15.6 kg heavier in Nebraska than in Florida. Bi x Bt dams exceeded (P less than .001) Bt x Bt crossbred dams for all traits except age of calf at weaning and calf-survival rates (P greater than .10). Birth weights of calves from Bi x Bt crossbred dams were 3.4 kg lighter than those from the Bt x Bt crossbred dams. The interaction of location with the breed group comparison of Bi x Bt vs Bt x Bt crossbred dams was significant for pregnancy rate, calf age at weaning, rate of unassisted calving and all weight traits. Adjusted weaning weights of calves from HA, AH, PA, PH, BA, BH, SA and SH cows were as follows: HA, 194 and 222; AH, 202 and 230; PA, 213 and 242; PH, 217 and 245; BA, 251 and 254; BH, 252 and 254; SA, 236 and 238; and SH, 238 and 243 kg, respectively, in Florida and Nebraska. Bos indicus-sired cows (BA, BH, SA and SH) weaned essentially equal-weight calves at both locations, whereas calves from Bt x Bt crossbred cows (HA, AH, PA, PH) were about 28 kg lighter in Florida.
以内布拉斯加州克莱中心和佛罗里达州布鲁克斯维尔产出的2744头犊牛数据，评估基因型×地点互作对八个F1杂交母牛品种组繁殖性能和母性表现的重要性。共有648头F1杂交母牛，包括牛属×牛属（Bt×Bt）杂交组合：海福特牛×安格斯牛正反交杂种（HA和AH）、平茨高尔牛×安格斯牛（PA）、平茨高尔牛×海福特牛（PH）；以及瘤牛×牛属（Bi×Bt）杂交组合：婆罗门牛×安格斯牛（BA）、婆罗门牛×海福特牛（BH）、萨希瓦尔牛×安格斯牛（SA）和萨希瓦尔牛×海福特牛（SH）。头胎犊牛由红白花牛公牛所生。其余所有犊牛均由西门塔尔牛公牛所生。尽管内布拉斯加州的妊娠率高9%，但该州的顺产率和犊牛存活率均低4.6%。内布拉斯加州犊牛的出生体重和断奶体重比佛罗里达州分别重8.0千克和15.6千克。除犊牛断奶年龄和犊牛存活率（P＞0.10）外，Bi×Bt母畜在所有性状上均超过（P＜0.001）Bt×Bt杂交母畜。Bi×Bt杂交母畜所生犊牛的出生体重比Bt×Bt杂交母畜所生犊牛轻3.4千克。地点与Bi×Bt和Bt×Bt杂交母畜品种组比较的互作，在妊娠率、犊牛断奶年龄、顺产率和所有体重性状上均显著。HA、AH、PA、PH、BA、BH、SA和SH母牛所生犊牛在佛罗里达州和内布拉斯加州的校正断奶体重如下：HA分别为194千克和222千克；AH分别为202千克和230千克；PA分别为213千克和242千克；PH分别为217千克和245千克；BA分别为251千克和254千克；BH分别为252千克和254千克；SA分别为236千克和238千克；SH分别为238千克和243千克。瘤牛所生母牛（BA、BH、SA和SH）在两个地点断奶的犊牛体重基本相同，而Bt×Bt杂交母牛（HA、AH、PA、PH）所生犊牛在佛罗里达州的体重约轻28千克。
