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Twin release of luteinizing hormone in progestagen - PMSG treated Finn x Dorset Horn ewes

  • W.S. Dingwall (a1), G.D. Henderson (a2), J.J. Robinson (a3) and T. Atkinson (a3)

Extract

The induction of early breeding in flocks of ewes under natural daylength conditions was made possible following the evolution of a modified progestagen - PMSG treatment (Gordon, 1971). However, lamb production from early bred ewes has invariably been lower than that achieved from ewes bred within the main breeding season. In attempting to elucidate the underlying determinants of the inferior fecundity of the early bred ewe, the present experiment was undertaken to compare the ovulatory and hormonal responses of ewes subjected to progestagen - PMSG treatment at different times of the breeding season.

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Gordon, I. (1971). J. Agric. Sci., 76, 337341.
Linten, K., Lamming, G.E. and Butt, W.R. (1973) J. Reprod. Fert., 35, 607609.
Wintenberger-Torres, S. (1961) Ann. Biol. Anim. Biochim. Blophys. , 1, 121133.

Twin release of luteinizing hormone in progestagen - PMSG treated Finn x Dorset Horn ewes

  • W.S. Dingwall (a1), G.D. Henderson (a2), J.J. Robinson (a3) and T. Atkinson (a3)

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