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	Author	Mitchell, D.; Allen, W. R.
	Title	Observations on reproductive performance in the yearling mare			Type	Journal Article
	Year	1975	Publication	Journal of Reproduction and Fertility	Abbreviated Journal	J. Reprod. Fert.,
	Volume	(Suppl. 23)	Issue		Pages	531-536
	Keywords
	Abstract	Reproductive performance was studied in 137 yearling mares run with stallions in small groups for 3 months between June and August in 1968 to 1971 (four breeding seasons). Pregnancy diagnosis by repeated rectal palpation and qualitative tests for PMSG, showed that ninety-five mares conceived of which forty-four aborted spontaneously between days 30 and 160 of gestation. Laboratory examination of twenty-one aborted fetuses failed to show any infectious agents. Serial quantitative and qualitative tests for PMSG in aborting animals gave results similar to those observed in mares with normal pregnancies. Plasma progestagen assays showed marked individual variations although the loss of the conceptus was always associated with a drop in progestagen level. The high incidence of early pregnancy loss in these pubertal mares may also be related to immaturity, inadequate nutrition and physical stress.
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	Language		Summary Language		Original Title
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	ISSN		ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	no
	Call Number	Equine Behaviour @ team @			Serial	2378
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