PMID: 6162952Mar 1, 1981Paper

Duration of oestrus, ovulation rate, time of ovulation and plasma LH, total oestrogen and progesterone in Galway adult ewes and ewe lambs

Journal of Reproduction and Fertility
J F QuirkeJ P Gosling

Abstract

The mean duration of oestrus, ovulation rate, duration of the preovulatory LH discharge, time interval between sponge removal and beginning of the LH discharge, total LH discharged, maximum LH value observed and the concentration of progesterone in the peripheral plasma during the luteal phase of the oestrous cycle was similar in Galway adult ewes and 8-month-old ewe lambs after treatment with intravaginal sponges containing 30 mg cronolone for 12 days and injection of 500 i.u. PMSG. The interval between sponge removal and the onset of oestrus was shorter for adults than for ewe lambs; the interval between the onset of oestrus and the beginning of the LH discharge was longer in adults. During the period 12-36 h after sponge removal the mean plasma total oestrogen concentration was significantly higher in lambs than in adults. In a separate study of the time of ovulation in Galway ewe lambs given the same progestagen-PMSG treatment, ovulation did not occur in any lamb before 17 h after the onset of oestrus and the majority ovulated close to the end of oestrus.

Citations

Mar 30, 2004·Hormones and Behavior·H GelezC Fabre-Nys
Jun 6, 2000·Advanced Drug Delivery Reviews·B u r g g r a a f ShaneM J Rathbone
Oct 12, 2000·Small Ruminant Research : the Journal of the International Goat Association·L SimonettiJ C Gardón
Jan 1, 1994·International Journal of Aging & Human Development·E B RyanJ B Orange
Jun 21, 2018·Animal Science Journal = Nihon Chikusan Gakkaihō·Gabriela Azenha Milani SorianoCaliê Castilho
Jan 18, 2008·Reproduction in Domestic Animals = Zuchthygiene·A Veiga-LopezA Gonzalez-Bulnes
May 20, 2003·Reproduction in Domestic Animals = Zuchthygiene·M Q Husein, R T Kridli

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