Precocious Semen Production in Turkeys

Turkey toms were reared under short days [either 8 h light (L): 16 h dark (D) or 12L:12D] and photostimulated by transfer to 14L:10D between 7 and 22 wk of age. Photostimulation between 12 and 15 wk of age initiates semen production at 18 to 20 wk of age. The fertilizing capacity of semen produced by these males is normal and the output of spermatozoa is unaffected when semen production is initiated precociously. Daylengths of 8L:16D or 12L:12D during the rearing period had no influence on subsequent reproductive performance. Semen production and fertilizing capacity were unaffected by nutritional regimens that reduced energy intake and maintained adequate protein consumption by toms. These programs reduced body weight of the mature tom by 10 to 30% and substantially increased the general fitness of the birds. Prevention of obesity improved feathering, facilitated handling of the birds, and reduced the incidence of ambulatory perturbations.