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Phytase effects on amino acid digestibility in molted laying hens. Research conducted at the University of Illinois determined
the effect of phytase on the ileal digestibility of amino acids. Molted
Dekalb Delta Leghorn laying hens were fed diets containing either corn-soybean;
corn soybean meal and bone meal, or corn-soybean meal and wheat middlings.
Two levels of phytase were fed (0 and 300 U/kg of diet) in a 2x3 factorial
designed study. The hens were fed the treatments for 21 days, euthanized
and the ileal contents were collected for amino acid digestibility measurements.
A significant interaction was observed between diet and phytase level
for alanine, glycines, leucine and methionine. The interaction resulted
because the phytase treatment increased amino acid digestibilities for
the C-SBM-MBM and C-SBM-WM diets and reduced amino acid digestibilities
for the C-SBM diet. Diet type had a significant effect on the digestibilities
of most amino acids. The effect was due primarily to the lower digestibilities
for the C-SBM-MBM compared to the C-SBM-WM diet. Phytase had no significant
affect on digestibility of any amino acid. Ideal digestible energy was
significantly affected by diet but not with the addition of phytase.
The researchers concluded that diet type had a significant effect on
apparent amino acid digestibility and digestible energy, but the addition
of 300 U/kg of phytase has no consistent effect on these measurements.
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