Influence of Phytase with Or without Organic Acid (Sodium Di-Formate) Supplementation on Growth Performance, Carcass Response, Protein and Mineral Digestibility in Starter Phase of Broilers

ABSTRACT This experiment was planned to evaluate the effects of phytase supplementation with or without organic acid (OA) on performance, protein, calcium (Ca), phosphorus (P) and sodium (Na) digestibility and carcass parameters in broiler chickens fed low Ca and low P diets in comparison to a high Ca and high P diet with standard specifications. For this purpose, two iso-nitrogenous and iso-caloric diets were prepared in such a way that one diet had high Ca (9.80) and high P (4.50) and second diet had low Ca (8.50) and low P (2.40), respectively. Low Ca and low P diet was further supplemented with enzyme phytase @ 500 FTU/kg, and phytase @ 500 FTU/kg + organic acid (1 kg/ton). Rations were offered to seven replicates of ten birds each, from day 1 to 21. Results revealed that the experimental treatments had no effect on feed intake and growth performance of birds (p>0.05). Carcass parameter results showed highest thigh meat yield % and liver weight % in the birds fed diet with low Ca & P and supplemented with enzymes phytase (p<0.05). Fecal P and Na digestiblities were high (p<0.05) in experimental broilers fed low Ca low P with enzyme phytase supplementation as compared to the diet without phytase supplementation. It is concluded that phytase and OA supplementation in the starter diet with low Ca and low P level did not influence intake, growth and feed conversion of the broilers. However, thigh meat yield percent and mineral digestiblities (P and Na) increased in the broilers that received the diet with low Ca and low P level and supplemented with enzyme phytase.

摘要：本试验旨在评估在低钙低磷日粮中添加植酸酶（phytase）与/或有机酸（OA），对肉仔鸡生长性能、蛋白质消化率、钙（Ca）、磷（P）、钠（Na）消化率及屠宰性能的影响，并以符合标准规格的高钙高磷日粮作为对照。试验共配制2种等氮等能日粮：一组为高钙（9.80）高磷（4.50）日粮，另一组为低钙（8.50）低磷（2.40）日粮。低钙低磷日粮进一步分为两个亚组，分别添加500 FTU/kg植酸酶，以及500 FTU/kg植酸酶+1 kg/吨有机酸。试验采用10羽/重复的饲养设计，共设置7个重复，试验周期为1~21日龄。结果表明，各试验处理对肉仔鸡的采食量与生长性能无显著影响（p>0.05）。屠宰性能指标方面，饲喂低钙低磷+植酸酶日粮的肉仔鸡大腿肉得率百分比与肝脏重量百分比均为最高（p<0.05）。相较于未添加植酸酶的日粮组，饲喂低钙低磷+植酸酶日粮的肉仔鸡粪便磷与钠消化率显著提升（p<0.05）。综上，在低钙低磷育雏日粮中添加植酸酶与有机酸，对肉仔鸡的采食量、生长性能及饲料转化率无显著影响。但饲喂低钙低磷+植酸酶日粮的肉仔鸡，其大腿肉得率百分比及磷、钠两种矿物元素的消化率均有所提高。