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There have been several reports of an association between haemoglobin genotype and reproductive performance in sheep (e.g. Evans & Turner, 1965; Obst, Seamark & McGowan, 1971; Purser & Hall, 1974). Recently Pant & Pandey (1975) presented evidence that Hb type influenced the response of ewes to superovulatory doses of PMSG. A subsequent report of a similar study of Welsh mountain ewes found no association between Hb type and response to PMSG (Trounson, Willadsen, Moor & Tucker, 1976).
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