Nutritional quality of rapeseed meal ii. metabolizable energy of rapeseed meal for 21 or 42 days old broilers and performance of broilers fed diets containing increasing levels of rapeseed meal
Arena, S.; Penz, A.M. Jr.;
Revista da Sociedade Brasileira de Zootecnia 17(2): 138-146
Rapeseed meal was tested, as protein source for broilers. Two experiments were conducted. In the first experiment the apparent metabolizable energy of rapeseed meal was determined for broilers either with 21 or 42 days of age. It was used in diets with 0, 20 or 40% of rapeseed meal. In both periods a reduction in the estimated level of metabolizable energy of rapeseed meal was observed when its level was increased in the diets and an increment of the value was observed when broilers were 42 days old. In the second experiment the performance of broilers fed diets containing 0.0; 7.5; 15.0; 22.5 or 30.0% of rapeseed meal was evaluated. Feed consumption, weight gain and feed efficiency was compared. No statistical difference (P > 0.05) was observed in birds fed initial diets (1 to 28 days old) with 0.0; 7.5; or 15.0% of rapeseed meal. However, it was showed a significant reduction (P < 0.05) in the performance of broilers feed diets with 22.5 or 30.0% of rapeseed meal. During the total period (1 to 56 days old) only broilers receiving 30% of rapeseed meal had their performance inferior to the others (P < 0.05).