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Abstract: This experiment was conducted to study the effect of a diet contained mushroom spent wheat straw (MSPWS) remaining from Agaricus bisporus cultivation on the performance of fattening lambs. MSPWS was collected from the fermentation room, the casing soil removed from the whole compost, and the residue then sun dried. In a completely randomised design, 24 male lambs were allocated to three experimental diets for a 105-day experimental period: (I) normal pellet diet, (II) pellet diet contained 15% of MSPWS, and (III) normal unpelleted or mesh diet. The average daily weight gains were 236, 204 and 177 g per animal for diets I, II and III, respectively. These differences were significant (p<0.05). The average daily dry-matter intakes were 1760, 1559 and 1604 g/animal, which also were significantly different (p<0.05), but no significant variation was observed for the feed-conversion ratio among the treatments. The average carcass dressing percentages were not significantly different (p>0.05) between the treatments when the animals were slaughtered for carcass analyses. Visual inspection could detect no differences between the animals receiving different diets.
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