Endocrine changes associated with a dietary-induced increase in ovulation rate (flushing) in gilts

Journal of Animal Science
B FlowersB N Day

Abstract

Effects of an increased level of dietary energy (flushing) on plasma concentrations of FSH, LH, insulin, progesterone and estradiol-17 beta and ovulation rate were studied in 16 gilts. Gilts received 5,400 kcal ME/d for one estrous cycle and the first 7 d of a second. On d 8 of the second estrous cycle, gilts received either 5,400 kcal ME/d (control [C], n = 8) or 11,000 kcal ME/d (flushed [F], n = 8) for the remainder of the estrous cycle. Blood was collected daily at 15-min intervals for 6 h from d 8 through estrus. Gilts were examined by laparotomy 6 d after estrus. Ovulation rate was greater (P less than .05) in F than C gilts (16.0 vs 9.4). Mean daily concentrations of FSH were greater (P less than .05) in F gilts at 5 d, 4 d and 3 d prior to estrus compared with C females. In both C and F gilts, FSH decreased (P less than .05) prior to estrus. Mean daily concentrations of LH and LH pulse amplitude were not different (P greater than .05) between treatments. Mean number of LH pulses/6 h at 4 d, 3 d and 2 d prior to estrus were greater (P less than .05) in F than in C gilts. In both treatments, LH pulse amplitude decreased (P less than .05) and pulse frequency increased (P less than .07) prior to estrus. Mean plasma concentr...Continue Reading

Citations

Apr 1, 1993·Zentralblatt für Veterinärmedizin. Reihe A·T RojkittikhunN Lundeheim
Jun 10, 2008·Journal of Animal Science·J A Renteria-FloresS K Webel
Aug 1, 1996·Tropical Animal Health and Production·T T Dan, P M Summers
Mar 3, 2005·Reproduction, Fertility, and Development·César A Mejia-GuadarramaHélène Quesnel
Jul 20, 2007·Reproduction in Domestic Animals = Zuchthygiene·I EgerszegiK-P Brüssow
Aug 16, 2008·Biology of Reproduction·Esbal JiménezWilliam F Pope
Feb 25, 1999·The Journal of Steroid Biochemistry and Molecular Biology·T Wise, J J Ford
Jun 14, 2005·Domestic Animal Endocrinology·Morag G HunterCheryl J Ashworth

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