Growth and development of testes in domesticated and hybrid (wild X domesticated) yak bulls

文献类型: 外文期刊

第一作者: Yan, P

作者: Yan, P;Pan, HQ;Zhi, DJ

作者机构:

关键词: histology;lactate dehydrogenase;testes;ultrastructure;yaks

期刊名称:ANIMAL SCIENCE ( 影响因子:1.559; 五年影响因子:1.642 )

ISSN: 1357-7298

年卷期: 2000 年 70 卷

页码:

收录情况: SCI

摘要: Testicular tissue was studied in domesticated yak and in wild yak X domesticated yak (F-1 and F-2) bulls at 6, 12, 18 and 24 months of age by stereology for quantitative histology and by comparative studies on the lactate dehydrogenase (LDH) isoenzyme spectrum, LDH activity and the percentage content of LDH isoenzymes in testes. The results indicated that all three types of yak were similar in both the characteristics of ultrastructure of testicular tissue and the degree of germ cell development. The process of spermatogenesis was initiated and sperm were produced for the first time at the age of 12 months in all three yak types. All yak types exhibited similar age-related increases in weight of testes, volume density of both the seminiferous tubules and seminiferous epithelium and weight of seminiferous epithelium but all these indexes were slightly affected by season. The number of LDH isoenzyme bands after electrophoresis varied with age as follows:four bands were present at 6 months of age,five bands at 12 and 18 months and six bands at 24 months of age. The sixth band was LDH-x, which appeared between the LDH4 and LDH5 band. These results indicated that yak bulls reach sexual maturity at 24 months of age and that puberty is not affected by infusion of wild strains.

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