AI Article Synopsis

  • The study aimed to evaluate how phytase and multi-carbohydrase affect the growth, nutrient digestibility, and overall quality of broiler chickens fed phosphorus and energy-deficient diets.
  • A total of 288 Ross 308 broiler chicks were divided into six dietary treatment groups, including a positive control and various AP-deficient diets with or without enzyme supplements.
  • Results showed that enzyme-supplemented diets improved growth metrics like body weight and feed conversion rates, enhanced tibia mineralization, and increased leg meat yield, with the best results seen in the diet combining both phytase and multi-carbohydrase.

Article Abstract

The objective of this study aimed to investigate the effectiveness of phytase alone and in combination with multi-carbohydrase in available phosphorus (AP) and energy-deficient diets on growth performance, nutrient digestibility, tibia traits, and carcass quality of broilers. A total of 288 1-d-old Ross 308 broiler chicks were randomly assigned to one of 6 dietary treatments in a completely randomized design, with each treatment having 6 replicates and 8 birds per cage. The treatments were as follows: 1) positive control with adequate nutrition (PC); 2) 0.20% AP-deficient diet without phytase (NC-1); 3) 0.25% AP-deficient diet without phytase (NC-2); 4) NC-1 diet plus 500 FTU/kg phytase (NCP-1); 5) NC-2 diet plus 750 FTU/kg phytase (NCP-2); and 6) NC-2 with 100 kcal/kg ME deficient diet plus 1,000 FTU/kg phytase and multi-carbohydrase: 2,200 U/kg galactomannanase, 30,000 U/kg xylanase, 22,000 U/kg β-glucanase, and 700 U/kg α-galactosidase (NCPM). Broilers in the PC group and those fed enzyme-supplemented diets exhibited greater (P < 0.05) growth performance in terms of body weight, average daily gain, and feed conversion ratio, along with enhanced tibia mineralization through the ash, calcium (Ca), phosphorus (P) composition, and tibia breaking strength compared to NC diets throughout the study. Among the treatments, broilers assigned to the NCPM group showed greater (P < 0.05) levels of energy and P digestibility on days 21 and 35. Concerning carcass characteristics, the leg meat yield was greater (P < 0.05) in broilers fed the NCP-2 diet compared to all other treatments on days 21 and 35. Supplementation of phytase at doses of 500 FTU/kg and 750 FTU/kg effectively recovers AP deficiencies of 0.20% and 0.25%, respectively, in broiler diets without compromising the growth performance of broilers. Additionally, combining multi-carbohydrase and phytase led to AP and energy loss recovery, which improved tibia mineralization and nutrient digestibility through their synergistic interaction.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11503210PMC
http://dx.doi.org/10.1093/jas/skae299DOI Listing

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Article Synopsis
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  • Four dietary treatments were tested over 25 days with varying P concentrations: adequate, low, and very low P, plus a very low P diet with phytase.
  • Results showed very low P diets negatively impacted growth and gut structure, increased stress markers, but low P diets and very low P with phytase helped maintain health and growth performance.
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Methods: A total of 2000 day-old Ross 308 broiler chickens were assigned to 5 dietary treatments, with 10 broilers per replicate and 40 replicates per treatment. The experimental diets included 1.

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