Variation in LH pulsatility during 24 h after a postweaning altrenogest treatment in relation to follicle development in primiparous sows

J.J.J. van Leeuwen, M.R.T.M. Martens, J. Jourquin, M.A. Draincourt, B. Kemp, N.M. Soede

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Abstract

This study assessed pulsatile release of LH during altrenogest treatment after weaning in primiparous sows and related this to follicle development, estrus and ovulation rate. Weaned sows (n = 10) received altrenogest 20 mg/day from D-1 to D13 (weaning = D0) at 0800 h. On D13, blood samples were collected every 12 min from 1000 until 1900 h (1st sampling period) and from 2300 h until 0800 h (2nd sampling period). During the 1st sampling period, LH concentrations remained low and no LH pulses were detected in 8/10 sows. During the 2nd sampling period, average and basal LH concentrations (P <0.04) and frequency of pulses (P <0.0001) were higher than during the 1st sampling period. Sows with short vs. long intervals to estrus (
Original languageEnglish
Pages (from-to)101-107
JournalAnimal Reproduction Science
Volume126
Issue number1-2
DOIs
Publication statusPublished - 2011

Keywords

  • luteinizing-hormone
  • allyl trenbolone
  • ovarian-function
  • lactating sows
  • ovulation rate
  • luteal-phase
  • protein loss
  • litter size
  • estrus
  • gilts

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