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NORGES LANDBRUKSHOGSKOLE Norvège (2003)

Supplementation of vetch (Vicia sativa) hay to Begait and Abergelle goats in northern Ethiopia

Berhane, Gebreyohannes

Titre  : Supplementation of vetch (Vicia sativa) hay to Begait and Abergelle goats in northern Ethiopia

Auteur  :Berhane, Gebreyohannes

Université de soutenance : NORGES LANDBRUKSHOGSKOLE (NORWAY)

Grade : DrScient 2003

Résumé
This thesis focuses on how to improve efficiency of traditional goat management systems in the dry and arid lowlands of northern Ethiopia. It consists of four papers. Paper 1 compares the effect of different levels of vetch hay supplementation on milk yield of grazing/browsing Begait and Abergelle goats, breeds that are indigenous to the region. Milk yield increased by up to 50% by increasing level of supplementation, but fat content decreased by about 30% and total solids content by 15 to 20%. Total production of milk energy increased on average by approximately 20%. It can be concluded that an increase in mean daily and annual milk yield could improve milk supply at household level and consequently improve nutritional status, especially important for vulnerable groups like children and women of reproductive age. Begait goats, traditionally kept for milk production, produced more milk than Abergelle goats that are more important as meat producers. However, daily performance of the two breeds did not differ when calculated as energy corrected milk per kg metabolic weight. Paper 2 investigates the effects of supplementing Begait and Abergelle goats with leguminous vetch hay on reproductive performance of does and growth rate of does and kids. Increased supplementation resulted in improved reproductive performance and higher live weight gains of goats and young stock. More goats in the highly supplemented groups were able to conceive and sustain pregnancy during the dry season and kid towards the end of the rains with more favourable conditions for growth and survival of kids. Age and body weight at first kidding were low in the experiment. It is suggested that postponing first mating might further improve body condition in the goats. Breed differences were found in live weight and growth rates of kids. In paper 3, feeding behaviour as well as feed availability and feed preferences of grazing/browsing Begait and Abergelle goats are studied. It is concluded that both breeds showed better preference to browsing than grazing during rainy and early dry period. In the mid and peak dry period goats showed higher trend of walking and grazing. Increased trend of walking for search of food in the dry season could consume more body energy reserves that would exhaust the body condition of goats. It is suggested that Begait and Abergelle goats should be reared in semi-extensive management conditions and be supplemented, especially during mid and peak dry season. In paper 4, chemical composition and in vitro fermentation pattern of vetch (Vicia sativa ) and some browse and grass species from northern Ethiopia were investigated. Vetch (fresh cut) was sampled during end of rainy period (late August) and vetch hay samples were taken during early dry period (mid September).

Mots clés : AGRICULTURE, ANIMAL CULTURE AND NUTRITION (0475) ; BIOLOGY, ANIMAL PHYSIOLOGY

Accès au document : Proquest Dissertations & Theses

Page publiée le 17 septembre 2004, mise à jour le 30 janvier 2017