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Evaluation of live performance and carcass characteristics of broiler chickens fed corn-soy diets supplemented with phytase and xylanase

Published: April 26, 2021
By: Horacio Rostagno¹, Luiz Albino¹, Melissa Hannas¹ and Sandra Rodrigues² ¹Federal University of Viçosa, Center for Agricultural Sciences, Department of Animal Science – Viçosa, Minas Gerais, Brazil ²BioResource International, Inc., Durham, NC, USA
Introduction:
NSPase enzymes have become an integral part of commercial poultry feed for enhancing the efficiency of nutrient utilization by the birds, thereby reducing the cost of production and improving growth performance. The supplementation of phytase in broiler diets is also standard practice due to its proven performance and relatively low cost.
Few studies have reported the contribution of xylanase in diets containing phytase. This study's primary objective was evaluating the efficacy of 66.7 g/MT inclusion of Xylamax, a thermostable xylanase, supplemented to corn-soy broiler diets containing phytase and formulated to four levels of metabolizable energy (ME).
Materials and Methods:
1840 male Cobb 500 broiler chicks were randomly assigned to 1 of 8 dietary treatments, with ten replicate cages per treatment, and 23 birds per cage. Birds were reared for 42 days on re-used wood shavings litter and fed corn-soy diets containing phytase ad libitum. The eight dietary treatments were arranged in a 4 x 2 factorial with four levels of ME, each with or without 65 g/MT supplemental xylanase (Xylamax). Diet energy was adjusted using soybean oil. The crude protein inclusion rate was 22.5% and 20% in the starter (0-21 days), and grower/finisher (22-42 days), respectively.
Evaluation of live performance and carcass characteristics of broiler chickens fed corn-soy diets supplemented with phytase and xylanase - Image 1
Key parameters evaluated were:
  • Body-weight (BW)
  • Feed intake (FI)
  • Feed conversion rate (FCR)
  • Carcass parameters
Results and Discussion:
At each level of dietary energy, Xylamax supplementation reduced 42-day FCR compared to the un-supplemented controls. Across energy levels, Xylamax numerically increased 42-day body weight gain (by +33 g) and significantly improved 42-day FCR by an average of 3 points (1.57 vs. 1.54). The most pronounced FCR improvement by adding Xylamax was seen during the grower/finisher phase and at the lower ME levels during that phase (5-point improvement at 3000 kcal/kg ME and 7-point improvement at 3075 kcal/kg ME). Xylamax supplementation also significantly improved absolute carcass weight (by +71 g), thighs and legs weight (by +23 g), and weight of wings (by +7 g).
Evaluation of live performance and carcass characteristics of broiler chickens fed corn-soy diets supplemented with phytase and xylanase - Image 2
Xylmax Provides Strong FCR Improvement in Grower/Finisher Phase
Evaluation of live performance and carcass characteristics of broiler chickens fed corn-soy diets supplemented with phytase and xylanase - Image 1
Evaluation of live performance and carcass characteristics of broiler chickens fed corn-soy diets supplemented with phytase and xylanase - Image 4
Evaluation of live performance and carcass characteristics of broiler chickens fed corn-soy diets supplemented with phytase and xylanase - Image 5
Conclusion:
Across energy levels adding 66.7 g/MT Xylamax improved FCR and carcass characteristics compared to unsupplemented control diets. Based on FCR, Xylamax was most effective during the grower/finisher phase when feed intake is highest. These data indicate that Xylamax consistently improves broiler performance in typical corn-soy broiler diets containing phytase.
Related topics:
Authors:
Sandra Rodrigues
BioResource International, Inc
Melissa Hannas
Universidade Federal de Viçosa - UFV
Universidade Federal de Viçosa - UFV
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Mangalmurti Pathak
14 de junio de 2021

To analyse the specific effect of xylanase enzyme negative control in the experiment is very important Std diet without Phytase and xylanase. Addition of oil in the diet will have its own effect on the performance. In such diet, heat increment losses are less compared to carbohydrate as energy source. This interferes with the efficacy of enzymes. Need to carry out statistical analysis to study the level of significance as it is controlled trial

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