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Feeding level does not affect progesterone levels in intermittently suckled sows with lactational ovulation.

R Gerritsen1, N M Soede, B F A Laurenssen

  • 1Adaptation Physiology, Animal Sciences Group, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands. Rosemarijn.gerritsen@wur.nl

Animal Reproduction Science
|July 14, 2007
PubMed
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Low progesterone (P4) levels in intermittently suckled sows during lactation were not influenced by feeding levels. Further research is needed to identify the causes of these lower P4 levels in sows.

Area of Science:

  • Reproductive biology
  • Animal science
  • Swine reproduction

Background:

  • Intermittently suckled (IS) sows exhibit low post-ovulatory plasma progesterone (P4) levels.
  • The relationship between high feeding levels during intermittent lactation and low P4 levels requires investigation.

Purpose of the Study:

  • To determine if high feeding levels during intermittent lactation contribute to low post-ovulatory plasma P4 in sows.
  • To investigate the impact of feeding level and ovulation type on P4 levels, corpus luteum (CL) parameters, and embryo development.

Main Methods:

  • Multiparous sows (n=21) underwent 12h daily separation from piglets from day 14 of lactation.
  • Ovulation was either spontaneous (n=9) or induced with PG600 (n=12).
  • Sows were fed either a high (6.5 kg) or low (feeding level minus 2.5 kg) diet from ovulation until 6 days post-ovulation.

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Main Results:

  • Plasma P4 levels were not significantly affected by feeding level or ovulation type (P>0.10).
  • Corpus luteum parameters, embryo survival rates, and embryo development at day 30 of gestation remained unaffected by feeding level or ovulation type.
  • Low plasma P4 levels were observed in IS sows with lactational ovulation, independent of feeding level in the first week post-ovulation.

Conclusions:

  • The feeding level during the first week after ovulation does not influence the low plasma P4 levels observed in intermittently suckled sows with lactational ovulation.
  • Additional research is necessary to elucidate the underlying factors responsible for reduced plasma P4 levels in these sows.