author(s)
Sarswat Chandra Shekher, Sharma Sunanda, Nehra Kuldeep Sharma, Prakash Chandra, Parashar Mukesh Chandra and Vaishanv CS

abstract
This investigation was conducted to study the effect of exogenous melatonin administration on testicular biometry of twelve sexually mature adult male Sirohi bucks during non-breeding season. Treated (T) animals (n=06) were administered single subcutaneous injection of melatonin. The Scrotal circumference (cm) and testicular volume (cm³) in control group [28.04±0.140, 167.90±4.439 (right) and 166.24±3.800 (left)] was comparable with that of treated group [28.91±0.193, 269.88±10.041 (right) and 267.53±9.568 (left)] for the first non-breeding season and for the second non-breeding season, control group [27.17±0.174, 120.05 ±5.843 (right) and 116.95 ±5.696 (left)] was comparable with that of treated group [32.50±0.302, 330.37 ±11.397 (right) and 329.22 ±10.846 (left)]the differences found significant for the both non-breeding seasons. Exogenous melatonin treatment significantly increased the scrotal circumference, testicular length, testicular width and testicular volume. In conclusion melatonin administration improved testicular biometry of Sirohi bucks during non-breeding season.