Category Archives: Semen Production - Part 2

Effects of Photoperiod and Age: 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 … Continue reading

Effects of Photoperiod and Age: RESULTS(2)

In trial 2, changes in hormone concentrations and semen production confirmed and extended the results from trial 1. The concentrations of LH were not different between lighting treatments from 12 to 15 wk of age (Fig. 1C). The level of … Continue reading

Effects of Photoperiod and Age: RESULTS(1)

In trial 1, the plasma concentrations of LH were not different between lighting treatments from 10 to 18 wk of age but were then generally higher in the LL group until 29 wk of age (Fig. 1A). In both the … Continue reading

Effects of Photoperiod and Age: MATERIALS AND METHODS(3)

Hormone Assays Concentrations of LH, T, and T4 were determined by validated RIA. The LH RIA has been described by Bacon and Long. The LH used for iodination and standard was of chicken origin (USDA-cLH-K-3), and the primary antiserum was … Continue reading

Effects of Photoperiod and Age: MATERIALS AND METHODS(2)

Trial 3 Male turkeys (RBC-3 line) 10 wk of age were used and treated as described for trial 1. Two weeks prior to serial bleeding, males were chosen at random and caged individually in floor pens (60 X 82 cm) … Continue reading

Effects of Photoperiod and Age: MATERIALS AND METHODS(1)

Trial 1 Male turkeys 10 wk of age (RBC-3 line, Ohio State University; ) were housed in light-tight rooms and given one of two lighting treatments: either LL (long-long), in which the turkeys (n = 13) were maintained under a … Continue reading

Effects of Photoperiod and Age on Secretory Patterns of Luteinizing Hormone and Testosterone and Semen Production in Male Domestic Turkeys

Changes in gonadotropins and sexual steroids have been determined in the male of many species in order to advance understanding of regulation of reproduction. Determination of changes in hormone concentrations in animals serially bled for several hours shows that both … Continue reading

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