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Associations between Energy Metabolism, LH Pulsatility and First Ovulation in early Lactating Cows
Author(s) -
Jorritsma R,
Langendijk P,
Kruip TAM,
Wensing TH,
Noordhuizen JPTM
Publication year - 2005
Publication title -
reproduction in domestic animals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.546
H-Index - 66
eISSN - 1439-0531
pISSN - 0936-6768
DOI - 10.1111/j.1439-0531.2004.00558.x
Subject(s) - ovulation , lactation , endocrinology , medicine , biology , energy balance , follicular phase , energy metabolism , physiology , hormone , pregnancy , ecology , genetics
Contents 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.