PMID: 11906927Mar 22, 2002Paper

Interval between preovulatory surges of luteinizing hormone increases late in the reproductive period in turkey hens

Biology of Reproduction
H K LiuW L Bacon

Abstract

In turkey hens, the egg production rate is relatively high early during a reproductive period, but declines as the period progresses. Among lines with different egg production potential, the interval between preovulatory surges of LH is the primary determinant of the egg production rate. The main objective of this study was to determine whether the decline in egg production rate late during an egg production period is also associated with a difference in the interval between LH preovulatory surges. A group of photosensitive turkey hens (Early) were photostimulated with continuous light (24L:0D) at 40 wk of age to induce egg laying, and serial blood samples were collected after about 3 wk of egg production. A second group of hens (Late) were housed in floor pens and photostimulated with 14L:10D at 40 wk of age for a normal 36-wk reproduction period and were then switched to 24L:0D lighting for 2 wk before collection of serial blood samples. Continuous light photostimulation was used for at least 2 wk before and during serial blood sampling to avoid potential masking effects of diurnal lighting on the interval between LH surges. The Early (n = 12) and Late (n = 16) hens were cannulated 3 days before being serially bled hourly for...Continue Reading

References

May 1, 1978·Journal of Reproduction and Fertility·J B Williams, P J Sharp
Apr 1, 1979·Biology of Reproduction·E S HuangA V Nalbandov
Jul 1, 1977·British Poultry Science·T R Morris
May 1, 1991·British Poultry Science·K Lillpers
Mar 1, 1987·General and Comparative Endocrinology·C J JoynerT G Taylor
Jul 1, 1985·Journal of Reproduction and Fertility·D WaddingtonM A Hardie
Apr 1, 1983·Poultry Science·A H ZakariaK Imai
Oct 1, 1994·General and Comparative Endocrinology·D P ChapmanW H Burke
Dec 1, 1996·Poultry Science·W L Bacon, D W Long
Feb 24, 2001·Poultry Science·M GrossmanW J Koops
May 23, 2001·Biology of Reproduction·H K LiuW L Bacon
Jul 27, 2001·Poultry Science·M Grossman, W J Koops
Dec 1, 1961·Endocrinology·H OPEL, A V NALBANDOV

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Citations

Jan 12, 2012·Journal of Applied Animal Welfare Science : JAAWS·Darmel M BayerB H Pavithra
May 14, 2004·Biology of Reproduction·Wayne L Bacon, Han-Ken Liu
May 5, 2017·Frontiers in Physiology·Colin G Scanes

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