Effects of Low Calcium and Phosphorus Diet Supplemented with High Dose Phytase on Growth Performance, Tibia Indexes and Calcium and Phosphorus Metabolism of Yellow-Feathered Chickens Aged from 1 to 42 Days

FAN Qiuli, JIANG Shouqun, GOU Zhongyong, LI Long, LIN Xiajing, WANG Yibing

doi:10.3969/j.issn.1006-267x.2019.04.032

2019 , Vol. 31 >Issue 4: 1743 - 1753

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.04.032

Molecular Nutrition

Effects of Low Calcium and Phosphorus Diet Supplemented with High Dose Phytase on Growth Performance, Tibia Indexes and Calcium and Phosphorus Metabolism of Yellow-Feathered Chickens Aged from 1 to 42 Days

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State Key Laboratory of Livestock and Poultry Breeding, Ministry of Agriculture Key Laboratory of Animal Nutrition and Feed Science in South China, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China

Received date: 2018-09-06

Online published: 2019-04-16

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Abstract

The aim of this experiment was to study the effects of low calcium and phosphorus diet supplemented with high dose phytase on growth performance, tibia indexes and calcium and phosphorus metabolism of yellow-feathered chickens aged from 1 to 42 days. One thousand and eighty 1-day-old Lingnan yellow-feathered male chickens were randomly assigned to six groups with six replicates per group and 30 chickens per replicate. Chickens in the positive control group (PC group) fed a basal diet with normal dicalcium phosphate supplementation; chickens in medium calcium and phosphorus levels diet group (MP group) reduced by 50% dicalcium phosphate supplementation, chickens in MP+2000 and MP+4000 groups were supplemented with 2 000 and 4 000 FTU/kg phytase based on MP group, respectively; chickens in low calcium and phosphorus levels diet group (LP group) did not supplement with dicalcium phosphate, chickens in LP+2000 and LP+4000 groups were supplemented with 2 000 and 4 000 FTU/kg phytase based on LP group, respectively. The ratio of calcium to phosphorus remained at 1.4:1.0 in each group. The experiment lasted for 42 days. The results showed as follows:1) the body weight, average daily gain and average daily feed intake of phytase supplementation groups were significantly higher than those of MP group (P<0.05), and those of MP+4000 and LP+4000 groups were significantly higher than those of PC group (P<0.05). 2) The tibia bone density of MP+2000 and MP+4000 groups was significantly higher than that of MP group (P<0.05); the dehydrated and degreased weight of tibia of phytase supplementation groups was significantly higher than that of MP group (P<0.05), and that of LP+4000, MP+2000 and MP+4000 groups was significantly higher than that of PC group (P<0.05); the tibia ash content of LP+2000 and LP+4000 groups was significantly lower than that of MP and PC groups (P<0.05); the tibia phosphorus and calcium contents of LP+2000 group were significantly lower than those of MP and PC groups (P<0.05). 3) The serum alkaline phosphatase activity of phytase supplementation groups was significantly lower than that of MP group (P<0.05). 4) The expression of fibroblast growth factor receptor 1 (Fgfr1) in kidney of MP+4000 group was significantly higher than that of MP and PC groups (P<0.05). 5) The fecal calcium content of LP+4000 group was significantly lower than that of MP group (P<0.05), and that of LP+2000 and LP+4000 groups was significantly lower than that of PC group (P<0.05); the fecal phosphorus content of LP+2000 and LP+4000 groups was significantly lower than that of MP group (P<0.05), and that of MP+4000, LP+2000 and LP+4000 groups was significantly lower than that of PC group (P<0.05); the calcium metabolism rate of LP+4000 group was significantly higher than that of PC group (P<0.05). In conclusion, low calcium and phosphorus diet supplemented with high dose phytase can improve the growth performance of yellow feathered chickens aged from 1 to 42 days, increased the dehydrated and degreased weight of tibia, reduce the serum alkaline phosphatase activity. Medium calcium and phosphorus diet supplemented with high dose phytase can improve tibia bone density, and up-regulate the expression of Fgfr1 gene in kidney. Only considering the growth performance, serum biochemical indexes, tibia indexes and calcium and phosphorus metabolism index, high dose phytase can be used to partially or completely replace the dicalcium phosphate in the corn-soybean meal of Lingnan yellow feathered chickens aged from 1 to 42 days.

Key words： phytase; growth performance; tibia index; calcium and phosphorus metabolism; yellow-feathered chickens

Cite this article

FAN Qiuli, JIANG Shouqun, GOU Zhongyong, LI Long, LIN Xiajing, WANG Yibing . Effects of Low Calcium and Phosphorus Diet Supplemented with High Dose Phytase on Growth Performance, Tibia Indexes and Calcium and Phosphorus Metabolism of Yellow-Feathered Chickens Aged from 1 to 42 Days[J]. Chinese Journal of Animal Nutrition, 2019 , 31(4) : 1743 -1753 . DOI: 10.3969/j.issn.1006-267x.2019.04.032

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