Abstract
The objective was to evaluate the effect of diets containing various levels of phytate and phytase on broilers from 1 to 42 days old. The treatments consisted of a combination of diets containing high (HP), medium (MP) and low (LP) phytate with positive control diet (PC) and a negative control diet (NC) that was similar to the PC in energy and protein but with less calcium and phosphorus. Three additional diets, based on the NC were supplemented with 500, 1000, or 1500 FTU kg-1 of phytase. Broilers that received the NC diet exhibited the lowest weight gain (WG), whereas those supplemented with 1000 FTU kg-1 obtained 2.84% higher WG compared with PC. Broilers that received NC had the lowest breaking strength and dry matter. Birds fed HP diets that received NC and NC + 500 FTU kg-1 had a higher concentration of serum Ca and P than birds fed LP diets. Broilers fed the NC and NC + 500 and 1000 FTU kg−1 had lower tibia Ca levels compared with birds fed the PC. Broilers fed HP diets had higher tibia Ca content than MP. Phytase supplementation had a positive response in diets with reduced Ca and P. Based on regression analysis the optimum inclusion of phytase to improve broiler performance parameters was calculated as 952 FTU kg-1.
Highlights
Phytic acid is the principal storage form of phosphorus (P) in cereal grains and legumes
weight gain (WG) showed a quadratic response (P
Broilers that received Negative control (NC) exhibited the lowest WG, which was 3.19% lower than positive control diet (PC) and significantly different from the WG of broilers that received NC + 1000 FTU kg-1 diets, which was 2.84% higher than PC
Summary
Phytic acid is the principal storage form of phosphorus (P) in cereal grains and legumes. The effectiveness of the enzyme is influenced by the characteristics of the birds (species, age, physiological conditions), dietary factors such as phytate concentration and source, concentration of minerals, and the origin and level of phytase added to the diet (Dersjant-Li et al, 2015). Leyva-Jimenez et al (2019) reported an improvement in broiler performance, bone mineralization and ileal digestibility of energy from 1 to 24 days old. Walters et al (2019) demonstrated that rising levels of phytase increased feed consumption and BW, and yielded higher nutrient digestibility and bone mineralization. This study was designed to evaluate the effects of high, medium, and low levels of phytase supplementation performance, bone characteristics, blood parameters, and processing yield of broilers from 1 to 42 days old
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