Effects of Phytase on Growth Performance, Nutrients Apparent Availability and Excretion Indexes of Geese

XU Xiaona; WANG Baowei; GE Wenhua; ZHANG Ming; LI Wenli

doi:10.3969/j.issn.1006-267x.2013.06.024

Chinese Journal of Animal Nutrition >

2013 , Vol. 25 >Issue 6: 1315 - 1323

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.06.024

Feed Science and Technology

Effects of Phytase on Growth Performance, Nutrients Apparent Availability and Excretion Indexes of Geese

XU Xiaona ,
WANG Baowei ,
GE Wenhua ,
ZHANG Ming ,
LI Wenli

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College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China

Received date: 2013-12-21

Online published: 2013-05-15

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Abstract

This experiment was conducted to study the effects of phytase on growth performance, nutrients apparent availability, the number of E.coli and the contents of total nitrogen and total phosphorus in fecal of Wulong geese. Two hundred and sixteen one-day-old Wulong geese were randomly divided into 6 groups with 3 replicates in each group and 12 geese in each replicate. Geese in the positive control group (group Ⅰ) were fed a basal diet (without phytase), geese in the negative control group (group Ⅱ) were fed a low phosphorus diet (without phytase, 0.1% lower available phosphorus), and the others in the experimental groups (groups Ⅲ～Ⅵ) were fed diets supplemented with 300, 600, 900, 1 200 IU/kg phytase in the low phosphorus diet, respectively. The experiment lasted for 16 weeks. The results showed as follows: 1) at 1 to 4 weeks of age, the average daily gain (ADG) and average daily feed intake (ADFI) in group Ⅳ were significantly higher than that in group Ⅰ (P<0.05), the feed to gain (F/G) in group Ⅳ was significantly lower than that in group Ⅰ (P<0.05), the ADG in group Ⅳ was significantly higher than that in group Ⅱ (P<0.01), and the F/G in group Ⅳ was significantly lower than that in group Ⅱ (P<0.01); the ADG in group Ⅴ was significantly higher than that in group Ⅱ (P<0.05), and the F/G in group Ⅴ was significantly lower than that in group Ⅱ (P<0.05). At 5 to 16 weeks of age, the ADG and ADFI in groups Ⅳ, Ⅴ, Ⅵ were significantly higher than that in group Ⅱ (P<0.05), and the F/G in groups Ⅳ, Ⅴ was significantly lower than that in group Ⅱ (P<0.05). 2) The apparent availability of calcium, phosphorus and acid detergent fiber in groups Ⅲ, Ⅳ, Ⅵ were significantly higher than that in group Ⅱ (P<0.05), the apparent availability of calcium and phosphorus in group Ⅴ were significantly higher than that in groups Ⅰ, Ⅱ (P<0.01), and the neutral detergent fiber apparent availability in group Ⅴ was significantly higher than that in groups Ⅰ, Ⅱ (P<0.05); the dry matter apparent availability in groups Ⅳ, Ⅴ was significantly higher than that in group Ⅰ (P<0.05). 3) The number of E.coli in groups Ⅲ, Ⅳ, Ⅴ, Ⅵ was significantly lower than that in group Ⅱ (P<0.05), and the total phosphorus content in groups Ⅳ, Ⅴ, Ⅵ was significantly lower than that in group Ⅰ (P<0.05). In conclusion, consideration from the growth performance, the optimal dietary phytase level is 600 IU/kg at 1 to 4 weeks of age, and 900 IU/kg at 5 to 16 weeks of age; while consideration from total phosphorus content in excretion, the optimal dietary phytase level is 900 IU/kg at 1 to 16 weeks of age.

Key words： phytase; Wulong goose; growth performance; nutrients apparent availability; E.coli; total nitrogen; total phosphorus

Cite this article

XU Xiaona , WANG Baowei , GE Wenhua , ZHANG Ming , LI Wenli . Effects of Phytase on Growth Performance, Nutrients Apparent Availability and Excretion Indexes of Geese[J]. Chinese Journal of Animal Nutrition, 2013 , 25(6) : 1315 -1323 . DOI: 10.3969/j.issn.1006-267x.2013.06.024

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