PMID: 9437575Jan 23, 1998Paper

Effect of age and body weight on plasma concentrations of luteinizing hormone in turkey hens before and after photostimulation

Domestic Animal Endocrinology
T J ApplegateM S Lilburn

Abstract

The independent effects of age and body weight (BW) on photostimulatory response in turkey breeder hens were studied by measuring changes in plasma luteinizing hormone (LH; ng/mL) before and 3 d after photostimulation. The study was conducted with hens from two BW groups at 24-25, 27-28, and 31-32 wk of age. There was approximately a 1-kg difference in BW between groups within an age. Six hens per BW and age group were cannulated (jugular vein) and serially sampled during each of two 6-hr periods. Samples were collected at 10-min intervals. The two sampling periods were the last 6 hr of the short-day photoperiod (SD) and the same period during the third long day after photostimulation (LD). The photostimulatory response (PR) or difference between the SD and LD baseline LH concentrations was greatest in the 24-25-wk-old hens. The PR was unaffected by hen BW at any age. The baseline LH concentration during the SD photoperiod declined as hens aged. After photostimulation, baseline LH and LH peak amplitude concentrations were higher in 24-25-wk-old hens compared with the older ages. The number of LH peaks increased after photostimulation, but there were no significant effects attributable to age or BW within an age. In conclusion, ...Continue Reading

References

Dec 1, 1992·Poultry Science·T D Siopes
Sep 1, 1990·Poultry Science·P Y Hester, R W Stevens
Jun 1, 1988·British Poultry Science·P M HockingM A Walker
Sep 1, 1985·Journal of Reproduction and Fertility·D L FosterD H Olster
Sep 1, 1974·Poultry Science·A E WoodardR L Snyder
Jun 1, 1994·Comparative Biochemistry and Physiology. Biochemistry and Molecular Biology·K A KrishnanJ M Bahr
Jun 1, 1994·Poultry Science·M S Lilburn
May 1, 1993·Poultry Science·P J Sharp
Dec 1, 1996·Poultry Science·W L Bacon, D W Long

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