Nonphytate Phosphorus Requirement and Efficacy of a Genetically Engineered Yeast Phytase for Yellow Broilers at 22-to 42-d-Old Age
An experiment was conducted to investigate the requirement of nonphytate phosphorus(nPP) and efficacy of a genetically engineered yeast phytase(PHY A) for Lingnan yellow broilers from 22-to 42-d-old age.A total of 1 320 1-d-old male chicks were randomly divided into 11 dietary treatment groups,which...
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Published in | Agricultural sciences in China Vol. 10; no. 2; pp. 304 - 311 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.02.2011
Key Laboratory of Animal Nutrition and Feed Science South China, Ministry of Agriculture/Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou,510640, P.R.China |
Subjects | |
Online Access | Get full text |
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Summary: | An experiment was conducted to investigate the requirement of nonphytate phosphorus(nPP) and efficacy of a genetically engineered yeast phytase(PHY A) for Lingnan yellow broilers from 22-to 42-d-old age.A total of 1 320 1-d-old male chicks were randomly divided into 11 dietary treatment groups,which consisted of 4 replicate floor pens with 30 birds per pen.The control group(treatment 1) was fed with basal diet of nPP 0.08% without dicalcium phosphate or phytase supplementation.Dietary levels of nPP were 0.16,0.24,0.32,0.40,0.48,and 0.56%,respectively,for treatments 2 to 7,through addition of dicalcium phosphate(chemistry grade) to the basal diet.Diets of treatments 8 to 11 were supplemented with PHY A at 200,400 and 600 U kg-1,a commercial phytase product(PHY B) at 400 U kg-1 level,respectively.The birds in 0.32-0.56% nPP groups gained more than those of the other groups(P0.05).The nPP supplementation significantly improved feed intake(P0.05).The feed gain ratio was significantly decreased by 0.40% nPP diet compared to the control birds(P0.05).The level of 0.48% nPP was required for optimum tibia development.The additions of PHY A at 400 and 600 U kg-1 level and PHY B all significantly improved ADG(P0.05),ADFI(P0.05),and dry defatted tibia weight(P0.05).Similarly,the percentage of tibia ash was increased by 600 U kg-1 PHY A supplementation(P0.05).The requirement of nPP for maximal ADG and highest percentage tibia ash both was 0.40%.The phosphorus equivalency value of PHY A was estimated as 685 U kg-1 for male yellow broilers of 22-to 42-d-old age. |
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Bibliography: | S965.3 S831.5 phosphorus equivalency value yellow broilers 11-4720/S nonphytate phosphorus; growth; tibia ash; genetically engineered yeast phytase; phosphorus equivalency value; yellow broilers growth genetically engineered yeast phytase nonphytate phosphorus tibia ash |
ISSN: | 1671-2927 |
DOI: | 10.1016/S1671-2927(11)60008-4 |