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http://dx.doi.org/10.5536/KJPS.2007.34.2.119

Effects of Dietary Phytase on Performance, Egg Quality, Excretion of N and P, and Ileal Digestibility in Laying Hens  

HwangBo, J. (National Institute of Animal Science)
Ahn, J.H. (National Institute of Animal Science)
Chung, W.T. (National Institute of Animal Science)
Ohh, S.J. (Institute of Animal Science Resources, Kangwon National University)
Lee, H.J. (National Institute of Animal Science)
Kim, H.K. (National Institute of Animal Science)
Lee, S.U. (National Institute of Animal Science)
Hong, E.C. (National Institute of Animal Science)
Publication Information
Korean Journal of Poultry Science / v.34, no.2, 2007 , pp. 119-128 More about this Journal
Abstract
The effects of microbial phytase on laying performance, egg quality, and ileal digestibility of nutrients and amino acids were examined at three levels of phytase (0, 300, 600 unit/kg) in 55-wk-old White Leghorn for 4 weeks. Egg productivity tended to increase with supplemental phytase compared to that of control. Daily feed intake of hens fed phytase also increased. Egg shell thickness was not significantly different among the treatments. Haugh unit and yolk color were not statistically different. However, egg shell breaking strength was high at phytase treatment. Excretion and absorption of nitrogen were no difference among all treatments, but those of phosphorus was higher in the phytase treatment than control. The digestibility was high at crude fiber, crude ash, calcium and phosphorus in nutrients, at lysine, methionine and phenylalanine in essential amino acids, and alanine, cystine, glutamic acid, glycine and tyrosine in non-essential amino acids. In conclusion, supplemental microbial phytase in laying hens diet may help to improve egg production and to decrease P of feces. But, further studies were needed to investigate on the digestibility.
Keywords
microbial phytase; hen; Laying performance; egg quality; excretion;
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