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Title: The effects of undernutrition on reproduction in goats
Author: Mani, Aliyu Usman
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1994
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It has been generally accepted that nutrition is one of the most important factors that affects reproductive performance in livestock. The impact of feed-restriction has however rarely been investigated in the goat because of the relative unimportance of the species in the developed countries, and the common assumption of its similarity to sheep and cattle. The recent increase in demand for high quality fibre in the developed countries and for animal protein in the Third World has however awakened interest in the species. The aim of this project was to provide information on the effects of undernutrition on the oestrous cycle and on pregnancy in goats. Restriction of feed intake to only 25% of maintenance requirement from 19 days prior to oestrus reduced the number of goats that exhibited oestrus following synchronisation with intravaginally inserted progestagen-impregnated sponges, reduced ovulation rate and the incidence of twin and triple ovulations and reduced the number of goats that became pregnant. A trial which examined superovulation of goats with porcine FSH suggested no effect of undernutrition on the superovulatory response and early development of goat embryo. Feed restriction for 19 days before and 60 days after mating reduced the size and weight of foetuses and the mass of foetal fluids and tended to reduce the weight of the cotyledonary component of the placenta without affecting the number of placentomes. While length of gestation had a significant influence on foetal and placental measurements, number of foetuses had no effect. Transfer of healthy embryos to does on full or restricted rations before and/or after embryo transfer resulted in poor pregnancy rates and significant reduction in the survival of the transferred embryos irrespective of the timing of feed restriction.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available