Abstract
The objective of this study was to evaluate the use of silk flower (Calotropis procera SW) hay in 32 castrate male lambs of Morada Nova breed, in feedlot, fed with diets containing 0.0, 15.0, 30.0, and 45.0% of silk flower hay (SFH). The animals (12.72±1.99 kg BW) were slaughtered at 19.29±2.25 kg BW. A completely randomized design, with four diets and eigth replicates, was used. Increasing SFH levels reduced carcass confor- mation (2.31, 2.58, 2.17 and 1.81 points), leg perimeter (33.38, 32.17, 32.17, 30.00 cm), carcass compacity (live weigth/carcass length) (0.18, 0.18, 0.17, 0.15 cm), corrected half carcass weight (4.52, 4.63, 4.43, 3.69 kg), loin weight (0.66, 0.69, 0.64, 0.50 kg), shoulder weight (0.83, 0.86, 0.80, 0.67 kg) and rib weight (1.13, 1.09, 1.05, 0.84 kg), while there was a linear increase in leg weight (30.98, 30.81, 31.60, 34.47 kg) and mesenteric fat percentage (1.02, 0.65, 1.17, 1.42%). Increasing dietary levels of SFH to lambs affected carcass measurements and carcass yield, retail cuts and non-carcass components. It is thought that the inclusion of 30% of SFH in the diet is excellent for the maintenance of carcass characteristics in regions where there is access to this fodder plant.
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