OVARIAN CHARACTERISTICS AND REPRODUCTIVE-PERFORMANCE OF AGED COW
OVARIAN CHARACTERISTICS AND REPRODUCTIVE-PERFORMANCE OF AGED COW
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DOI：
10.1095/biolreprod15.4.555
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发表时间：
1976-01-01
影响因子：
3.6
通讯作者：
MURPHREE, RL
中科院分区：
文献类型：
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作者：
ERICKSON, BH;REYNOLDS, RA;MURPHREE, RL
152头14 ~ 15岁的赫里福德级奶牛死亡或屠宰时的繁殖性能平均为9.3 +-。0.3头小牛，计算出的平均终身繁殖能力为10.4头小牛。中位数为10头小牛，模态数为12头。根据连续两年不能生育小牛的标准，15岁是超过50%的牛群不育的年龄。对69头可育奶牛和78头不育奶牛的卵巢进行了连续切片和显微检查；生殖细胞总供体量各组间差异无统计学意义（P < 0.05），可育组仅在卵泡数量上显著高于不育组（P < 0.01）。各组间泡囊数量和质量均无差异。14 ~ 15岁奶牛的平均生殖细胞供给量为24 +-。3000 （n = 147）。囊性黄体是不孕症的主要原因。
The reproductive performance of 152 grade Hereford cows that were 14 to 15 yr of age at either death or slaughter resulted in an observed mean of 9.3 .+-. 0.3 calves and a calculated mean lifetime reproductive capacity of 10.4 calves. The median was 10 calves and the modal number was 12. As dictated by the criterion failure to bear a calf during 2 successive years, 15 yr was the age at which over 50% of the herd became infertile. Ovaries from 69 fertile and 78 infertile cows were serially sectioned and microscopically examined; the groups did not differ in total germ-cell endowment (P > 0.05), and fertile significantly exceeded infertile only in number of growing follicles (P < 0.01). No intergroup difference occurred in either number or quality of vesicular follicles. The mean germ-cell endowment of 14 to 15 yr old cows was 24 .+-. 3000 (N = 147). Cystic corpus luteum was the apparent principal cause of infertility.