The effect of dietary protein on reproduction in the mare. VII. Embryonic development, early embryonic death, foetal losses and their relationship with serum progestagen

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dc.contributor.authorVan Niekerk F.E.
dc.contributor.authorVan Niekerk C.H.
dc.date.accessioned2011-05-15T15:57:00Z
dc.date.available2011-05-15T15:57:00Z
dc.date.issued1998
dc.description.abstractSixty-four Thoroughbred and Anglo-Arab mares aged 6-12 years were randomly allocated to 4 dietary groups and fed diets that differed in the total protein content and quality (essential amino-acids). Forty mares were non-lactating and 24 lactating. Eight mares were withdrawn from the investigation owing to injuries or gynaecological pathology. An overall conception rate of 94.6 % and a foaling rate of 80 % was achieved. Five of 14 (35.7 %) mares (Group 1) fed a low-quality protein diet suffered from early embryonic loss before 90 days of pregnancy compared to 3 of 41 (7.3 %) mares in the remaining groups that received the higher-quality protein in their diets. Serum progestagen concentrations of mares in Group 1 that suffered foetal loss were indicative of luteal function insufficiency during the 1st 40 days post-ovulation. Non-lactating mares in all 4 groups gained on average approximately 30 kg in mass during the 90 days before the breeding period. Lactating mares in Group 1 (low-quality protein) lost on average 25 kg in mass during lactation, with no weight loss observed among the lactating mares in the other 3 groups. No difference in the diameter of the embryonic vesicle was found between dietary groups until Day 35 of pregnancy.
dc.description.versionArticle
dc.identifier.citationJournal of the South African Veterinary Association
dc.identifier.citation69
dc.identifier.citation4
dc.identifier.issn382809
dc.identifier.urihttp://hdl.handle.net/10019.1/10162
dc.subjectgestagen
dc.subjectanimal
dc.subjectanimal disease
dc.subjectarticle
dc.subjectblood
dc.subjectbreeding
dc.subjectfemale
dc.subjectfetus death
dc.subjecthorse
dc.subjectlactation
dc.subjectphysiology
dc.subjectpregnancy
dc.subjectprenatal development
dc.subjectprotein intake
dc.subjectreproduction
dc.subjectstandard
dc.subjectstatistical analysis
dc.subjectAnimals
dc.subjectData Interpretation, Statistical
dc.subjectDietary Proteins
dc.subjectEmbryonic and Fetal Development
dc.subjectFemale
dc.subjectFetal Death
dc.subjectHorses
dc.subjectLactation
dc.subjectPregnancy
dc.subjectPregnancy, Animal
dc.subjectProgestins
dc.subjectReproduction
dc.titleThe effect of dietary protein on reproduction in the mare. VII. Embryonic development, early embryonic death, foetal losses and their relationship with serum progestagen
dc.typeArticle
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