Evaluation of methodology for administration of porcine FSH for use in estrus induction and for increasing ovulation rate in prepubertal gilts

Amy L. Jackson, Shawn M. Breen, Sandra L. Rodriguez-Zas, Robert V. Knox

Research output: Contribution to journalArticle

Abstract

Ovulation rate influences production efficiency of oocytes and embryos and depends upon the amount of gonadotropin administered and the ratio of FSH:LH activity. In Experiment 1, gilts (n = 135) were assigned to receive 10 or 15 Armour units (AU) of porcine FSH containing 6%, 10%, or 15% LH, whereas controls received PG600. Gilts received 1/6th the FSH dose in six sc administrations at 8-h intervals. There was no treatment effect on incidence of estrus (66%) or cysts (23.9%), or number of corpora lutea (CL, 29.6). However, treatment did affect the percentage of gilts ovulating (P < 0.05) with fewer 10 AU FSH with 15% LH-treated gilts ovulating (15%) compared to controls (72%), whereas the other treatments did not differ (range, 44-65%). Experiment 2 tested whether FSH in polyvinlypyrrolidinone (PVP) could induce estrus and ovulation with reduced administration frequency. Gilts (n = 105) were assigned to receive 15 AU FSH with 10% LH in one (1P) or two sc administrations (2P) whereas controls received PG600. There was no treatment effect on incidence of estrus (64%) or cysts (22%). However, the percentage of gilts ovulating was lower for 1P (56%), but did not differ (P < 0.05) between 2P (83%) and controls (85%). Treatment influenced ovulation rate (P < 0.05) with 2P having more CL (24) than controls (12) and 1P (19). Results indicated that 10 and 15 AU FSH induced estrus and ovulation, although high LH content proved detrimental. Further, 15 AU FSH with 10% LH in PVP allowed for reduced administration frequency without compromising ovulation.

Original languageEnglish (US)
Pages (from-to)1042-1047
Number of pages6
JournalTheriogenology
Volume66
Issue number4
DOIs
StatePublished - Sep 1 2006

Keywords

  • Estrus
  • FSH
  • Gilt
  • Ovulation
  • Superovulation

ASJC Scopus subject areas

  • Small Animals
  • Food Animals
  • Animal Science and Zoology
  • Equine

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