Performance and bone quality of broilers fed diets containing different levels of phosphorus and supplemented with phytase
| Autor: | Mariana M Saldanha, Luiz F P Pereira, Anna R C Abreu, Fernanda L S Castro, Winnie L S Clímaco, Itallo C S Araújo, Leonardo J C Lara |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Revista Colombiana de Ciencias Pecuarias. 36:66-79 |
| ISSN: | 2256-2958 0120-0690 |
| DOI: | 10.17533/udea.rccp.v36n2a2 |
| Popis: | Background: Although phytase has been widely used in poultry nutrition, the effects of the enzyme on broilers fed low levels of phosphorus are poorly understood. Objective: To evaluate the effects of two commercial phytases on live performance and bone quality of broilers fed diets with normal and reduced levels of phosphorus. Methods: Two experiments were conducted with four treatments and six repetitions with 30 birds each, for a total of 24 groups. The first experiment (Exp. I) used a reference level of available phosphorus (AP) with four treatments, as follows: Positive control= 0.45% AP starter diet/0.40% AP grower diet without phytase; Phytase X= 0.35% AP starter diet/0.30% AP grower diet + Phytase X; Phytase Y= 0.35% AP starter diet/0.30% AP grower diet + Phytase Y; and Negative control= 0.35% AP starter diet/0.30% AP grower diet, without phytase. In experiment II (Exp. II) the same treatments were used, but AP levels were reduced by 0.10%. The variables analyzed were: performance from one to 35 days, and bone quality at 35 days of age. Both experiments were analyzed using a completely randomized design. Results: In Exp. I, the positive control resulted in greater body weight gain (2,558 g; p |
| Databáze: | OpenAIRE |
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