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http://dx.doi.org/10.5536/KJPS.2008.35.2.115

Effect of Dietary Microbial Phytase on Laying Performance, Egg Quality, Phosphorus Utilization and Nutrient Metabolizability in Laying Hens  

Jang, H.D. (Department of Animal Resource & Science, Dankook University)
Hyun, Y. (Seoul Feed, Co. Ltd)
Kim, H.S. (Seoul Feed, Co. Ltd)
Hwang, I.W. (EASY BIO System, Inc)
Yoo, J.S. (Department of Animal Resource & Science, Dankook University)
Kim, H.J. (Department of Animal Resource & Science, Dankook University)
Shin, S.O. (Department of Animal Resource & Science, Dankook University)
Hwang, Y. (Department of Animal Resource & Science, Dankook University)
Zhou, T.X. (Department of Animal Resource & Science, Dankook University)
Chen, Y.J. (Department of Animal Resource & Science, Dankook University)
Cho, J.H. (Department of Animal Resource & Science, Dankook University)
Kim, I.H. (Department of Animal Resource & Science, Dankook University)
Publication Information
Korean Journal of Poultry Science / v.35, no.2, 2008 , pp. 115-121 More about this Journal
Abstract
The study was conducted to evaluate the effects of dietary microbial phytase on egg productivity, egg quality, phosphorus utilization and nutrient digestibility in laying hens. The animals used in the experiment were a total of 120 Hy-Line Brown laying hens (32 weeks old). Dietary treatments included 1) CON (basal diet), 2) LP (low phosphorus diet) 3) NP (low phosphorus diet + 0.03% normal microbial phytase) and 4) CP (low phosphorus diet + 0.03% coated microbial phytase). Six laying hens were allotted to a block (pen) with five replicated. Through the whole period of experiment, egg production was significantly increased in CON and CP treatments compared to LP treatment (P<0.05). CON, CP and NP treatments significantly increased their egg shell breaking strength and egg shell thickness compared to LP treatment (P<0.05). CON, CP and NP treatments resulted higher yolk color and Haugh unit than LP treatment (P<0.05). Calcium and inorganic phosphorus contents in blood were higher in CP treatment compared to LP treatment (P<0.05). Dry matter digestibility and nitrogen digestibility were greater in CP treatment than CON, LP and NP treatments (P<0.05). Crude ash was increased in CON, CP and NP treatments compared to LP treatment (P<0.05). Calcium digestibility and phosphorus digestibility were significantly improved in CP and NP treatments than CON and LP treatments (P<0.05). Calcium retention of CON, CP and NP treatments were higher than LP treatment (P<0.05). Phosphorus retention was increased in CP and NP treatments compared to CON and LP treatments (P<0.05). LP treatment significantly increased their nitrogen, calcium excretion compared to CON, CP and NP treatments (P<0.05). Phosphorus excretion was decreased in LP, CP and NP treatments compared to CON treatment (P<0.05). In conclusion, CP treatment improved egg production, egg quality, inorganic calcium and phosphorus in blood, calcium and phosphorus retention and nutrient digestibility and decreased nitrogen and calcium excretion in laying hens.
Keywords
microbial phytase; egg production; egg quality; phosphorus utilization; laying hens;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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