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Post pubertal changes in gonadal and extragonadal sperm reserves in bos indicus strain bulls






Theriogenology 17(6): 655-668

Post pubertal changes in gonadal and extragonadal sperm reserves in bos indicus strain bulls

Testes and epididymides were collected from 136 young (1.5-3.5 yr of age) and 33 mature B. indicus strain bulls, reared under extensive range conditions in the tropics. Testicular and epididymal sperm reserves and weights increased at different rates in the young bulls. Daily sperm production per gram of testis (SDPG) increased significantly before, and epididymal sperm reserves after, 2.5 yr of age. Testicular and epididymal weights increased linearly with body weight. Sahiwal cross bulls had higher testicular and epididymal weights and greater sperm reserves than did Brahman cross bulls of the same age. Testicular and epididymal weights, daily sperm production and epididymal sperm reserves for mature Brahman bulls were 670 g, 61 g, 4.9 .times. 107 and 25.5 .times., respectively. Testis weight was highly correlated with total daily sperm production (DSP) and epididymal weight.

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Accession: 006153183



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