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- W2742357827 abstract "This chapter discusses the changes in the responses of the hypophyseal-gonadal axis in developing cockerels which are raised under short or long photoperiods. Medium-weight M55 strain cockerels were raised under a constant photoperiod of either eight (8L) or sixteen hours (16L). Birds from each group were given a single dose of 5μg/kg body weight luteinizing hormone-releasing hormone (LH-RH) at 8, 12, 16, 20, and 24 weeks of age. LH, testosterone (T), and androstenedione (A) were measured in blood withdrawn at various times up to 90 min following LHRH. A clear LH discharge occurred in all cases. The incremental change in LH in the 8L birds did not change significantly with age, while in the 16L birds, it was greater at 8 and 12 weeks than at 16, 20, and 24 weeks. The percentage increase in the LH levels was similar in both groups and was higher at 8 and 12 weeks than at other times. Basal levels of A were higher, and the change after LH-RH greater than those of T at 8 and 12 weeks in both groups of birds. At 16 weeks, basal levels of A and T were similar but T increased more than A after LH-RH. Basal T levels were much higher than A levels at 20 and 24 weeks, similarly a greater increase in T levels was noted after LH-RH. From 16 weeks of age onwards, basal levels of T and the increase after LH-RH was greater in the 16L than in the 8L birds." @default.
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- W2742357827 date "1957-06-01" @default.
- W2742357827 modified "2023-10-14" @default.
- W2742357827 title "Annual review of nuclear science. Volume 6. 1956" @default.
- W2742357827 doi "https://doi.org/10.1016/0016-0032(57)90250-8" @default.
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