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Effects of Different Sources of Microbial Phytase on Production Performance of Brown-Egg Layers Fed Diets Containing a High Level of Rice Bran

B. Tangendjaja^*, T. K. Chung and J. Broz

^* Research Institute for Animal Production P. O. Box 221, Bogor 16002, Indonesia; Phone: 62 251 240 752; Fax: 62 251 240 753
Roche Vitamins Asia Pacific Pte Ltd, Singapore
Roche Vitamins Ltd, Switzerland

Correspondence: B. Tangendjaja, E-mail: budtang{at}bogor.wasantara.net.id

Rice bran is widely used in rice-producing countries as a feed ingredient in layer diets. It contains a high level of P, of which 80% is phytate-bound P. A trial was conducted on a commercial layer farm to evaluate effects of three different sources of microbial phytase (Phytase A, Phytase B, and Phytase C) on production performance of brown-egg layers fed diets containing 22% rice bran. A total of 46,080, 23-wk-old layers was used. They were randomly allocated to 20 identical houses containing 2,304 birds per house. A standard control diet containing 0.31% nonphytate P and 3.60% calcium was used. The control diet was reformulated to contain 0.19% nonphytate P to which three different sources of microbial phytase were added. Phytase A was added at 180 g/ tonne, Phytase B at 120 g/tonne, and Phytase C at 60 g/tonne. All experimental diets were fed to layers for 25 wk. Results indicated that there were no statistically significant phytase effects, regardless of source, on hen-day production, feed intake, egg mass, or number of cracked eggs when compared to the control treatment group. The result suggests that Phytases A, B, and C are effective sources of microbial phytase that can be used in reduced-P layer diets containing a high level of rice bran.

Key Words: phytase • enzyme • layer • rice bran • phosphorus