Abstract
Testes and epididymides were collected from 136 young (1.5 to 3.5 years of age) and 33 mature Bos 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 (DSPG) increased significantly before and epididymal sperm reserves after 2.5 years of age. Testicular and epididymal weights increased linearly with bodyweight. Sahiwal cross bulls had higher testicular and epididymal weights, and greater sperm reserves than did Brahman cross bulls at the same age. Testicular and epididymal weights, daily sperm production and epididymal sperm reserves for mature Brahman bulls were 670g, 61g, 4.9 billion and 25.5 billion respectively. Testis weight was highly correlated with total daily sperm production (DSP) and epididymal weight.
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