Galina C S, Calderón A, McCloskey M
Departamento de Reproducción. Facultad de Medicina Veterinaria y Zootecnia. Universidad Nacional Autónoma de México 04510 México D.F.
Theriogenology. 1982 May;17(5):485-98. doi: 10.1016/0093-691x(82)90175-3.
In order to study the characteristic signs of an induced estrus in beef cattle maintained in the tropics, 31 animals, 16 pure Charolais and 15 Charolais/Brahman cross, were continuously observed during the first 100 hours following prostaglandin injection. The animals were pastured in a field of approximately 3 hectares. A highly significant relationship (P < 0.01) seemed to exist between behavioural tendencies and the interval following the onset of estrus. Behaviour included butting, attempts to mount, smelling of genitalia (active) and allowing to be mounted and have genitalia smelled (passive). No consistant pattern of sexual activity could be established since some animals were more active than others. Mounts were observed to occur between 6 and 9 in the morning (33%), 9 and 12 at night (16%) and midnight and three in the morning (13%). Differences existed between the Charolais and the Brahman cross with respect to the number of mounts (P < 0.05) and in the response to an induced estrus (P < 0.05). No correlation was found between grazing habits and sexual activity, the former expressed as the number of animals standing up during each hour.
为研究热带地区饲养的肉牛诱导发情的特征迹象，在注射前列腺素后的前100小时内，对31头肉牛进行了持续观察，其中16头为纯种夏洛莱牛，15头为夏洛莱/婆罗门杂交牛。这些牛在一块约3公顷的牧场上放牧。行为倾向与发情开始后的间隔时间之间似乎存在极显著的关系（P < 0.01）。行为包括顶撞、试图爬跨、嗅闻生殖器（主动）以及允许被爬跨和嗅闻生殖器（被动）。由于一些动物比其他动物更活跃，因此无法确定一致的性行为模式。观察到爬跨行为发生在早上6点至9点（33%）、晚上9点至12点（16%）以及午夜至凌晨3点（13%）。夏洛莱牛和婆罗门杂交牛在爬跨次数（P < 0.05）以及对诱导发情的反应（P < 0.05）方面存在差异。未发现放牧习惯与性行为之间存在相关性，放牧习惯以前者每小时站立的动物数量来表示。
