Effects of Photoperiod and Age: RESULTS(3)

RESULTS(3)

Testes weights were significantly greater in the SL group than in the LL group at 35 wk of age, or 6 wk after the switch from SD to LD lighting (Fig. 3A). Overall mean body weight from both groups increased from 7.84 ± 0.9 kg at 12 wk of age to 23.36 ± 1.94 kg at 35 wk of age, with no difference observed between lighting treatments. buy flovent inhaler

In trial 3, changes in the pulsatile patterns of LH and T concentrations between lighting treatments were determined by serially bleeding birds over 9 h at 13, 23, and 35 wk of age. At 13 wk of age, both lighting treatment groups were predicted to be sexually immature; at 23 wk of age, most of the LL group was predicted to be sexually mature and most of the SL group sexually immature; while at 35 wk, both the LL and the SL groups were predicted to be sexually mature. At 13 wk of age, testes were small in size (Fig. 3B) and histologically immature in all 4 birds from each treatment. At 23 wk of age, testes were small in size and histologically immature in all 4 birds from the SL treatment, and none of the birds were producing semen. However, the testes were larger and histologically mature in all 4 birds from the LL treatment, and 3 of the 4 birds were producing semen.
Fig3Effects of Photoperiod
FIG. 3. Testes weights (mean ± SD). A) Trial 2 (n = 8 for LL, n = 9 for SL); all birds were 35 wk of age. B) From turkeys 13, 23, or 35 wk of age maintained under either LL (n = 4 for each age) or SL (n = 4 for each age), trial 3. Different letters within a group (age or treatment within age) indicate significant differences (p < 0.05).

This entry was posted in Semen Production and tagged Luteinizing Hormone, Male, Semen Production, Testosterone.