Bailey C M, Koh Y O, Foote W D, Hanks D R
Anim. Sci. Dept., University of Nevada, Reno 89557.
J Anim Sci. 1990 Apr;68(4):960-8. doi: 10.2527/1990.684960x.
Mature dams representing Hereford, Red Poll, F1 Hereford x Red Poll, F1 Red Poll x Hereford, F1 Angus x Hereford, F1 Angus x Charolais, F1 Brahman x Hereford and F1 Brahman x Angus breed types were evaluated. All cows were bred to Limousin sires to produce two-way or three-way-cross progeny. Mature Brahman x Hereford dams produced a higher (P less than .05) percentage of live calves than Herefords, but dam breed differences in percentage of calves weaned relative to the number of cows exposed for mating were not statistically significant. Progeny of Angus x Charolais and Red Poll dams were outstanding in weaning weight, but Hereford and Brahman-cross calves were below average. Planned comparisons showed that Angus x Charolais calves were heavier (P less than .01) at weaning than Hereford (23.0 +/- 3.8 kg) or Angus x Hereford (9.6 +/- 3.2 kg) progeny. Mature Angus x Hereford mothers weaned heavier calves than did Brahman x Herefords (7.4 +/- 3.2 kg, P less than .05) or Brahman x Angus (10.9 +/- 3.0 kg, P less than .01). Analysis of the Hereford-Red Poll diallel showed evidence of maternal heterosis in calf weaning weight (4.0 +/- 2.6 kg, P less than .05), but there was no difference in the percentage of calves weaned by crossbred vs straightbred dams.(ABSTRACT TRUNCATED AT 250 WORDS)
对代表赫里福德、红波尔、F1赫里福德×红波尔、F1红波尔×赫里福德、F1安格斯×赫里福德、F1安格斯×夏洛莱、F1婆罗门×赫里福德和F1婆罗门×安格斯等品种类型的成年母畜进行了评估。所有母牛均与利木赞公牛配种，以生产二元或三元杂交后代。成年婆罗门×赫里福德母畜所产活犊牛的百分比高于赫里福德母畜（P<0.05），但相对于配种母牛数量而言，断奶犊牛百分比的母畜品种差异无统计学意义。安格斯×夏洛莱和红波尔母畜的后代断奶体重出色，但赫里福德和婆罗门杂交犊牛低于平均水平。计划比较显示，安格斯×夏洛莱犊牛断奶时比赫里福德后代（23.0±3.8千克）或安格斯×赫里福德后代（9.6±3.2千克）更重（P<0.01）。成年安格斯×赫里福德母牛所断奶的犊牛比婆罗门×赫里福德母牛（7.4±3.2千克，P<0.05）或婆罗门×安格斯母牛（10.9±3.0千克，P<0.01）所断奶的犊牛更重。对赫里福德-红波尔双列杂交的分析显示，犊牛断奶体重存在母体杂种优势（4.0±2.6千克，P<0.05），但杂种母畜与纯种母畜断奶犊牛的百分比无差异。（摘要截选至250字）
