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EFFECTS OF ENZYME SUPPLEMENTATION ON THE UTILIZATION OF FIBROUS FEED INGREDIENTS IN BROILER DIETS
ABSTRACT
Effects of two enzymes, (Nutrase Xyla and Maxigrain) on the utilization of two fibrous feed ingredients, (Rice and Maize Offals) were studied in two broiler feeding experiments. For experiment one, there were eight dietary treatments for both the starter and finisher phases. Diet 1 was the control (0% rice offal, no enzyme), while diet 2 was made up of 0% rice offal diet plus maxigrain enzyme. Diets 3 to 8 were made up of the 7.5% and 15% dietary levels of rice offal with each dietary level supplemented with either zero enzyme or xylanase or maxigrain enzymes respectively. Enzymes were supplemented at the rate of 100g/ton of diet. Results for the starter phase (0-4weeks) showed that both enzymes when supplemented in the 7.5% and 15% rice offal diets, improved the performance of broiler chicks for final weight and weight gain over the unsupplemented rice offal diets. Broiler chicks, however, could not effectively utilize rice offal at both 7.5% and 15% in the diets even when supplemented with either of the two enzymes especially when compared with the results for the control diet. At the finisher phase (5-9weeks), the results showed that both enzymes significantly improved (p<0.05) broiler performance at 7.5% and 15% rice offal dietary inclusion levels above the performances of the birds on the unsupplemented rice offal diets and of those on the control diet for final weight, weight gain and average daily gain. vii Experiment two was also conducted using maize offal which was fed at 0 and 25% dietary levels. For each dietary level of maize offal, three enzyme sources were tested namely; zero enzyme, xylanase and maxigrain enzymes. Enzyme supplementations were also made at the manufacturers’ recommended level of 100g/ton of diet for both enzymes. The broiler starter phase lasted from zero to 4weeks while the finisher phase lasted from 5 to 9 weeks. Results showed that both enzymes had no significant effect when supplemented in the control diet but they both significantly improved the performance of broilers on the 25% maize offal diet for final weight, weight gain, average daily gain and feed-to-gain ratio up to the levels obtained with the control diet. There were significant reductions in feed cost (N/kg gain) in both experiments by enzyme supplementation. Carcass analysis showed tendency for enzyme supplementation to reduce the size of the liver. Percent Breast also increased slightly due to enzyme supplementation of the finisher diets. It was concluded that enzyme supplementation did not improve the utilization of energy rich diets but improved utilization of maize offal based diets at the broiler starter and finisher phases and of the diets containing up to 15% rice offal especially at the finisher phase. It was also concluded that broiler chicks cannot effectively utilize rice offal in their diet during the starter phase whether or not the diet is supplemented with enzymes.
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