Influence of short-term fasting during the luteal phase of the estrous cycle on ovarian follicular development during the ensuing proestrus of ewes

Animal Reproduction Science
B M AlexanderG E Moss

Abstract

Short-term fasting of mature ewes during diestrus results in increased serum concentrations of progesterone and a delayed pre-ovulatory surge release of LH. To determine if these changes in reproductive hormones influence subsequent follicular development, mature ewes observed in estrus were assigned randomly to control (n=10) or fasted (n=15) groups. Control ewes had ad libitum access to feed, whereas fasted ewes were not fed from day 7 through 11 of their estrous cycle. Daily blood samples were collected from control and fasted ewes throughout the fasting period. Fasting increased (P<0.001) serum concentrations of progesterone (4.4 ng/mL versus 2.7 ng/mL [+/-0.3]). On day 12, all ewes were treated with 10mg of PGF(2alpha) and fasted ewes were returned to ad libitum feed. Ovaries were collected from ewes (n=5 each group) at 0 and 72 h following PGF(2alpha) in control and 0, 72 and 96 h in fasted ewes. Ovaries were weighed and small (< or =2mm), medium (3-4mm), and large (> or =5mm) follicles were enumerated. Total numbers of follicles were less (P<0.001) in fasted than fed ewes (14.6 versus 30.2 [+/-2.2]) at 0 h, but did not differ (P=0.9) when numbers of follicles were compared at similar times before the anticipated LH surge...Continue Reading

References

Nov 1, 1993·Research in Veterinary Science·R A ParrT J Squires

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Citations

Mar 24, 2012·Animal : an International Journal of Animal Bioscience·A SchneiderM N Corrêa
Sep 16, 2011·The Journal of Clinical Endocrinology and Metabolism·Vasiliki A MoragianniChristos S Mantzoros
May 14, 2011·The Journal of Veterinary Medical Science·Mamiko OnoShigehisa Tsumagari
Jan 1, 2012·ISRN Veterinary Science·R M Garcia-Garcia
May 31, 2014·Physiology & Behavior·Joanna H SliwowskaMichael N Lehman
Jun 20, 2017·Reproduction in Domestic Animals = Zuchthygiene·C Naturil-AlfonsoF Marco-Jiménez

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