Phytase proven to increase broiler nutriton

The addition of microbial phytase may improve mineral and amino acid nutrition by decreasing their endogenous losses in the intestine of broiler chickens, according to Danisco Animal Nutrition, Singapore.

 

The effects of phytate and phytase on the endogenous flows of minerals and amino acids at the ileal level of broilers were investigated using purified diets.

 

 

The birds received the same purified basal diets according to a 2×2 factorial arrangement of treatments, with the factors in the study being two levels of phytate phosphorus (2 or 4 gram per kg; as-fed basis) in the presence or absence of Escherichia coli-derived phytase (500 FTU per kg), until birds were 21 days of age.

 

The results showed that phytate decreased the ileal flows of Fe (15%) and Cu (18%), but not for Mn, Zn, Mg, K and Ca.

 

Supplemental phytase decreased the flows of Mn (8%), Fe (21%) and K (13%), but not for Zn, Cu, Mg and Ca.

 

Phytate increased the ileal flows of most amino acids by 7%–27%, but reduced the ileal flow of Thr, and phytase decreased amino acid flows by 4%–22%.

 

The interactions of phytate and phytase were significant on the ileal flows of K, Cys and Tyr.

 

The results suggest that phytate may reduce amino acid utilisation by increased endogenous losses but increase mineral utilisation under conditions of feeding purified diets.

This study was conducted by Henan University of Science and Technology of China and Danisco Animal Nutrition, Singapore.