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sur le développement des zones arides et semi-arides

Titre : Effect of Different Levels of Groundnut Hay on Performance and Carcass Characteristics of Sudanese’s Desert Lambs (Shugor- Hamari )

Auteur : Dafallah Mohamed Ibrahim, Dafallah

Université de soutenance : University of Gezira

Grade : Master of Science (MS) of Animal Nutrition 2021

Résumé
Study was carried out to investigate the effect of different levels of groundnut hay on performance and carcass characteristics of Desert Sheep (Shugor- Hamari). Twenty-seven male lambs of each ecotype (Shugor and Hamari), at age of 4 – 5 months and average body weight 22.5kg were used. The lambs of each ecotype were randomly divided into three groups (9 lambs) each group were subdivided into three groups, fed three experimental rations with varying groundnut hay levels 0%, 20% and 30% respectively). Feeding was continued for 60 days. Final weight (kg), Total weight gain (kg), Daily weight gain (kg), Daily feed intake (kg) and Feed conversion ratio were determined. Three lambs of either ecotype were slaughtered terminally for carcass yield and meat quality assessments. Data were analyzed using General Linear Model (GLM), Univariate analysis of variance procedures. Study results showed that there were significant (P ≤ 0.05) difference for final weight, total weight gain, daily weight gain and daily feed intake. The results showed that ecotypes affect significantly (P ≤ 0.05) for Final weight (kg), Total weight gain (kg), Daily weight gain (kg), Daily feed intake (kg) and Feed conversion ratio. Highest values of Final weight (kg), Total weight gain (kg), Daily weight gain (kg) and Daily feed intake (kg) were recorded by Hamari. The result indicated that the groundnut hay levels was significantly (P ≤ 0.05) differences for slaughter weight and empty body weight. Ration with level 20% had the highest values for warm and cold carcass weight. There were significant (P ≤ 0.05) difference among groundnut hay level for carcass cuts weight The highest values of all carcass cuts were recorded by Hamari. There were significant (P ≤ 0.05) difference in dressing % (slaughter and empty body weight basis) according to groundnut hay levels, better results reported for ration with level 20%. The results showed that ecotypes affect significantly (P ≤ 0.05) the dressing % (slaughter and empty body weight basis), muscles and fat. The treatment effect was highly significant (P ≤ 0.01) difference for meat chemical composition, while the result indicated that ecotypes were significant (P ≤ 0.05) difference for meat chemical composition except Nitrogen free extract. It was concluded that the groundnut hay can be used up to 20% of the ration for fattening sheep without deleterious effect on performance.

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