Author(s):
1. Aneeq Ijaz:
Institute of Animal and Dairy Sciences, University of Agriculture, Faisalabad, Pakistan
2. Muhammad Sharif:
Institute of Animal and Dairy Sciences, University of Agriculture, Faisalabad, Pakistan
3. Safdar Hassan:
Institute of Animal and Dairy Sciences, University of Agriculture, Faisalabad, Pakistan
Abstract:
Recently, poultry feed prices are increasing day by day due to shortage of feed resources like Soybean meal that were imported in the country. Now there is need to explore the efficacy of local feed resources to bridging the gap between demand and supply of feedstuffs during current economic crisis in the country. The objective of the present study was to evaluate the effect of supplementing protease using different inclusion levels of rapeseed meal (RSM) in broiler diets on the growth, nutrient digestibility and carcass characteristics in broiler birds. Nine hundred (n=900) day-old ROSS 308® broiler chicks were purchased from commercial hatchery and randomly divided into nine dietary treatments with four replicates having 25 chicks/replicate. Nine iso-nitrogenous and iso-caloric experimental diets were formulated for starter (ME: 3000 kcal/kg: CP: 22%), grower (ME: 3100 kcal/kg: CP: 21%) and finisher (ME: 3150 kcal/kg; CP: 19%) phases. The control group was based on commercial diet having 0% RSM and the other diets contained 6 and 12% RSM. Each diet was supplemented without protease, with single (200 mg/kg) and double (400 mg/kg) dose of protease (Alimentier® GP100). Each experimental diet was randomly allotted to four replicates for the duration of the trial that lasted for 35 days. Data were recorded weekly to determine feed intake, body weight gain and FCR. Nutrient digestibility was determined by indirect marker method on days 19th and 20th for grower phase and 34th and 35th day in finisher phase. At the end of the experimental trial, one bird from each replicate was randomly slaughtered to analyze the carcass characteristics. The collected data were subjected to statistically analyze using 3×3 factorial arrangement under completely randomized design. Feed intake across the treatments was affected by protease supplementation. Maximum feed was consumed by birds fed on RSM based diet without supplemental protease, compared with those with supplementation suggesting that addition of protease reduced feed intake during grower and finisher stages. Body weight gain and FCR were also significantly affected (P<0.05) by protease supplementation in broiler diet. Control diet without RSM and diets with supplemental protease showed improvement in feed intake, body weight gain and FCR compared to the RSM-based diet. The utilization of RSM in broiler diets is often limited due to its high fiber content and the presence of anti-nutritional factors. Nutrient digestibility of supplemental diets was improved when single dose of protease was used in RSM 6% diet. Protease supplementation significantly (P<0.05) improved the CP digestibility. Carcass percentage was higher when single dose of protease was supplemented. Breast and thigh percentages were significantly (P<0.05) higher in control diets and in RSM 6% supplemented with single dose of protease. Liver and gizzard weights were significantly higher in RSM 12% while there was no effect of RSM on heart. The cost of feed was lower in the diets having RSM in them and cost per kg gain was also lower in RSM based diets. Protease supplementation had little effect on the cost of feeds. Based on these findings, it can be concluded that the inclusion of up to 6% RSM in broiler diets along with a single dose of protease enzyme, did not negatively affect growth performance, nutrient utilization and carcass parameters.
Page(s):
44-44
DOI:
DOI not available
Published:
Journal: Abstract Book on International Conference on Sustainable Agriculture and Food Security, August 27-31, 2023 , Volume: 0, Issue: 0, Year: 2023
Keywords:
protease
,
Food security
,
Animal agriculture
,
Rapeseed meal
,
Broiler performance
,
Soybean meal alternatives
,
Animal protein
References:
References are not available for this document.
Citations
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