Andrews A H
Res Vet Sci. 1975 Jul;19(1):71-7.
The oral and intra-osseous development of each of the six manidibular cheek teeth found in the permanent dentition of cattle was studied. The animals used were all British Friesians, of varying sex, and slaughtered at different weights at ages between 13 and 22 months. The various stages of development observed in each tooth together with the mean age and age range at which they were seen are recorded. Significant differences were found between the ages at which several of the developmental stages were seen in most of the teeth and indicated that tooth formation in the Friesian cattle studied tended to fall within well defined age limits.
对牛恒牙列中发现的六颗下颌颊齿各自的口腔内和骨内发育情况进行了研究。所使用的动物均为英国弗里斯兰牛，性别各异，在13至22个月龄之间、不同体重时屠宰。记录了每颗牙齿观察到的各个发育阶段以及观察到这些阶段的平均年龄和年龄范围。在大多数牙齿中，几个发育阶段出现的年龄之间存在显著差异，这表明所研究的弗里斯兰牛的牙齿形成往往落在明确界定的年龄范围内。
