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Ying P.,CAS Institute of Subtropical Agriculture | Ying P.,Hunan University | Wang W.,CAS Institute of Subtropical Agriculture | Duan W.,Animal Metabolism Laboratory of KDN Biotech Group | And 5 more authors.
Journal of Food, Agriculture and Environment | Year: 2011

An experiment was carried out to study the effects of phytase on the performance and calcium (Ca) and phosphorus (P) metabolism of AA broilers by supplementing phytase in low P diets. The basal diet (A) contained 0.41% of available P and diets B, C and D contained 0.26, 0.34 and 0.34, respectively. Phytase (U/kg) was supplemented to Diets B, C and D at 500, 500 and 250, respectively. Each diet was allocated to 6 replicates of 24 birds each. Two phases of feeding program were applied and the broilers were fed with different treatment diets at 0-21 d and 22-42 d. No significant difference was observed on average daily gain (ADG), feed/gain ratio (F/G) and daily feed intake (DFI) (P>0.05) of the treatment groups and on the occurrence of leg diseases. Phosphate excretion of broilers in groups B, C and D decreased by 26.7% (P<0.05), 24.0% (P<0.05) and 20.6% (P>0.05), respectively. No significant difference (P>0.05) was observed on length of tibia, ash content and Ca and P content in ash, but there was a significant reduction in tibia weight and strength in group B. There was no significant difference (P>0.05) in serum Ca, P and alkaline phosphatase among all the treatment groups. Source

Pan J.,Hunan Agricultural University | Pan J.,Animal Metabolism Laboratory of KDN Biotech Group | Wang W.,South China Agricultural University | Wang Y.,Animal Metabolism Laboratory of KDN Biotech Group | And 7 more authors.
Journal of Food, Agriculture and Environment | Year: 2012

The present study evaluated the effect of dietary phytase supplementation on the performance, apparent ileal digestibility (AID) of amino acids (AA) and P of growing piglets. A total of 32 growing piglets with a mean body weight (18.36±1.39 kg) were divided into 4 groups randomly: positive control group (A) is basal diet without phytase; negative control group (B) is similar to A except that available P was reduced by 0.18%, and two experiment groups C and D with 500 and 1000 U/kg phytase (5000 U/g), respectively, in B group diet. All piglets were fed for 30 days and then killed for sample collection. Consequently, no significant difference was observed on average daily gain (ADG) and ratio of feed to gain (F/G) in all groups, but ADG was 3.5% higher in D group compared with positive control group. Supplementing of phytase increased the AID of methionine, threonine, isoleucine, histidine and lysine (P<0.05). For D group, the AID of P was increased 24% (P<0.001) and the amount of P excreted was decreased by 17.9% (P<0.05) compared with A group. Dietary supplementation of phytase improved P digestion and utilization in growing piglets under the condition of the present study. Source

Chen Y.P.,Nanjing Agricultural University | Duan W.G.,Animal Metabolism Laboratory of KDN Biotech Group | Wang L.L.,Animal Metabolism Laboratory of KDN Biotech Group | Zhang S.L.,Animal Metabolism Laboratory of KDN Biotech Group | Zhou Y.M.,Nanjing Agricultural University
International Journal of Poultry Science | Year: 2013

A study was conducted to investigate the effects of thermostable phytase supplementation on the growth performance and nutrient digestibility of broilers for 42 d. 1-day-old Arbor Acres chicks with similar initial body weight were randomly divided into 3 treatments consisting 6 pens of 20 chicks per pen. The control group was given maize-soybean meal basal diet and the other two groups were fed the basal diet including either 500 U ordinary phytase/kg diet or 500 U thermostable phytase/kg diet. The results indicated that broilers given diets supplemented with thermostable phytase have increased body weight, body weight gain and feed intake than these fed basal diet (p<0.05). However, the same effect was only noted for body weight in ordinary phytase-supplemented group (p<0.05). Birds fed diet supplemented with thermostable phytase had enhanced crude protein utilization when compared with these given basal diet (p<0.05) but the same effect was not observed for broilers fed ordinary phytase-supplemented diet. As expected, dietary phytase supplementation significantly enhanced nitrogen-corrected apparent metabolizable energy of broilers (p<0.05) and this effect was more pronounced in the thermostable phytase-supplemented group. The results suggested that phytase supplementation, especially thermostable phytase supplementation, can improve the growth performance and nutrient utilization of broilers. © Asian Network for Scientific Information, 2013. Source

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