Bailey C M
University of Nevada, Reno 89557.
J Anim Sci. 1991 Jun;69(6):2379-86. doi: 10.2527/1991.6962379x.
Females 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 from birth until 10 yr of age. Of 308 females born alive, 35.7% died or were culled because of injury, serious illness, or reproductive failure. Breed types differed (P less than .01) in total number of mating seasons per cow and total number of progeny born and weaned. Values for lifetime total number of calves weaned were as follows: Hereford, 4.54; Red Poll, 5.45; Hereford x Red Poll, 4.45; Red Poll x Hereford, 5.49; Angus x Hereford, 5.98; Angus x Charolais, 5.57; Brahman x Hereford, 6.96; and Brahman x Angus, 6.22. Brahman crosses (P less than .01) and Angus x Charolais (P less than .10) exceeded Hereford dams in lifetime total number of calves weaned but did not differ from Angus x Herefords. Analysis of the Hereford-Red Poll diallel showed no evidence of heterosis in life span traits. Results indicate that breed type was a major source of variation in reproductive life span of beef-type females. F1 Bos indicus crosses and Angus x Herefords were outstanding in longevity.
对代表赫里福德、红波尔、赫里福德×红波尔F1代、红波尔×赫里福德F1代、安格斯×赫里福德F1代、安格斯×夏洛莱F1代、婆罗门×赫里福德F1代以及婆罗门×安格斯F1代等品种类型的雌性牛从出生到10岁进行了评估。在308头存活出生的雌性牛中，35.7%因受伤、重病或繁殖失败而死亡或被淘汰。各品种类型在每头母牛的总配种季节数以及出生和断奶的后代总数方面存在差异（P小于0.01）。终生断奶犊牛总数的值如下：赫里福德牛，4.54头；红波尔牛，5.45头；赫里福德×红波尔F1代，4.45头；红波尔×赫里福德F1代，5.49头；安格斯×赫里福德F1代，5.98头；安格斯×夏洛莱F1代，5.57头；婆罗门×赫里福德F1代，6.96头；婆罗门×安格斯F1代，6.22头。婆罗门杂交后代（P小于0.01）和安格斯×夏洛莱F1代（P小于0.10）在终生断奶犊牛总数上超过了赫里福德母牛，但与安格斯×赫里福德F1代没有差异。对赫里福德 - 红波尔双列杂交的分析表明，在寿命性状方面没有杂种优势的证据。结果表明，品种类型是肉牛型雌性繁殖寿命变异的主要来源。F1代瘤牛杂交后代和安格斯×赫里福德F1代在长寿方面表现出色。
