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Comparison of mechanically spraying urea in solution in the field or manually spraying the sheaves for treating wheat straw: Effects on digestibility and growth of lambs



Comparison of mechanically spraying urea in solution in the field or manually spraying the sheaves for treating wheat straw: Effects on digestibility and growth of lambs



Annales de Zootechnie 47(3): 197-205



Treating straw with a urea solution can increase its nitrogen level from 3.3 to 7.1% when the treatment method used is mechanical spraying in the field (PTUA) and from 3.3 to 10.8% when the sheaves are manually sprayed (PTUB). The increase in the amounts ingested was 34% for the PTUA straw and 39% for the PTUB straw in adult sheep. In growing lambs, the increase was only 18.2% and 19.8% for the PTUA and PTUB straws, respectively. The difference between the quantifies ingested by the adult and the growing animals can be explained by the fact that the lambs were fed a different amount of complement. The two spraying techniques used improved the digestibility of the treated straw by the same proportion with respect to untreated straw (PNT). The increase in growth attained by the lambs was slightly greater with the PTUA straw (112 g/day) as compared to the PTUB straw (103 g/day) or PNT straw (104 g/day). However, both PTUA and PTUB diets involved the same amount of complement, whereas the PNT diet involved more. Therefore, the PTUA and PTUB diets were 8-12% cheaper per kg of growth.

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