Semen production at an early age was also observed in male turkeys in the study of Etches et al., but no correlated hormone data were presented by these authors. There are reports that FSH in male chickens increases during development; this might induce sexual maturation and semen production. No information on FSH in turkeys is available because of the unavailability of a validated FSH assay in this species. ampicillin antibiotic
After 18 wk of age, the LL and SL lighting treatments were associated with different hormone levels. Higher levels of LH and T were detected in the LL group and were associated with earlier semen production and production of a larger volume of semen. Some of the turkeys maintained under SD photoperiods produced semen, which indicates that LD photoperiods are not absolutely necessary for sexual maturation in male turkeys; but it appears that SD photoperiods delay the onset of sexual maturation and decrease the quantity of semen produced (or that LD photoperiods advance sexual maturation and enhance semen production). SD are also associated with lower circulating concentrations of LH and probably T up to 29 wk of age, the most advanced age of SD lighting examined in the present experiments.