Associations between Energy Metabolism, LH Pulsatility and First Ovulation in early Lactating Cows

R. Jorritsma, P. Langendijk, T.A.M. Kruip, T.H. Wensing, J.P.T.M. Noordhuizen

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7 Citations (Scopus)

Abstract

This study was designed to elucidate associations between energy metabolism and LH pulsatility characteristics in early lactation, and days to first ovulation, in order to explain the relationship between energy balance and fertility observed in epidemiological studies. To this end, 10 multiparous HF cows were monitored during lactation, after the application of two different feeding strategies during the dry period. Days to first ovulation was assessed using blood progesterone measurements and LH pulsatility was measured in 8-h windows in the third week postpartum. The association between depth of negative energy balance and days to ovulation was confirmed. However, this study does not support the idea that LH pulsatility characteristics in early lactation are predictive for the interval between parturition and first ovulation
Original languageEnglish
Pages (from-to)68-72
JournalReproduction in Domestic Animals
Volume40
Issue number1
DOIs
Publication statusPublished - 2005

Keywords

  • dairy-cows
  • ovarian activity
  • dry period
  • postpartum
  • cattle
  • balance
  • secretion
  • hormone
  • leptin
  • number

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