Effects of Straw Fodder with Low Zinc Level and Adding Phytase on Growth Performance, Tibia Development and Antioxidant Capacity of Wulong Geese Aged from 5 to 16 Weeks

GE Wenhua, KE Changjiao, ZHENG Huiwen, WANG Baowei, ZHANG Ming, YUE Bin, ZHANG Yangyang, REN Min

doi:10.3969/j.issn.1006-267x.2017.07.018

2017 , Vol. 29 >Issue 7: 2357 - 2365

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.07.018

Molecular Nutrition

Effects of Straw Fodder with Low Zinc Level and Adding Phytase on Growth Performance, Tibia Development and Antioxidant Capacity of Wulong Geese Aged from 5 to 16 Weeks

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Nutrition and Feed Laboratory of China Agriculture Research System, Institute of High Quality Waterfowl, Qingdao Agricultural University, Qingdao 266109, China

Received date: 2017-01-22

Online published: 2017-07-05

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Abstract

This experiment was conducted to study the effects of straw fodder with low zinc level and adding phytase on growth performance, tibia development and antioxidant capacity of Wulong geese aged from 5 to 16 weeks. A total of 360 five-week-old Wulong geese were selected and randomly divided into 6 groups with 6 replicates in each group and 10 geese in each replicate (half male and half female). Geese in the group Ⅰ (control group) were fed a basal diet (supplemented with 75 mg/kg zinc sulfate, no phytase); the others in the groups Ⅱ to Ⅵ were fed the basal diet supplemented with 0, 5, 30, 45 and 60 mg/kg zinc sulfate, respectively, and all of them supplemented with 1 200 U/kg phytase. The experiment lasted for 12 weeks. The results showed as follows: 1) the body weight and average dairy gain in groups Ⅳ and Ⅴ were significantly higher than those in groups Ⅰ and Ⅱ (P<0.05), the average daily feed intake in group Ⅳ was significantly higher than that in groups Ⅰ and Ⅱ (P<0.05 or P<0.01), the feed to gain ratio in groups Ⅳ and Ⅴ was significantly lower than that in groups Ⅰ and Ⅱ (P<0.05 or P<0.01). Considered thecurve regression equation, when dietary zinc sulfate supplemental level was 60.50 mg/kg, the average dairy gain got the highest value; when dietary zinc sulfate supplemental level was 43.44 mg/kg, the feed to gain ratio got the lowest value. 2) The dressed percentage in groups Ⅲ to Ⅵ was significantly higher than that in groups Ⅰ and Ⅱ (P<0.05 or P<0.01), the percentage of half-eviscerated yield in group Ⅱ was significantly lower than that in other groups (P<0.05). 3) The bone mineral density (BMD) in groups Ⅳ to Ⅵ was significantly higher than that in group Ⅱ (P<0.05 or P<0.01), the content of calcium and phosphorus in bone in groups Ⅳ to Ⅵ was significantly higher than that in groups Ⅰ and Ⅱ (P<0.05 or P<0.01). 4) The total antioxidant power (T-AOC) of serum and liver in groups Ⅳ to Ⅵ was significantly higher than that in group Ⅱ (P<0.05 or P<0.01). When dietary zinc sulfate supplemental level was 45 mg/kg, the T-AOC of serum and liver got the highest. In conclusion, straw fodder with low zinc levels and adding phytase can improve the growth performance of geese aged from 5 to 16 weeks, promote the tibia development and strengthen the body's antioxidant capacity. Dietary added phytase can decrease zinc sulfate supplemental level through improving the biological titer of zinc. It is suggested that the optimal zinc supplemental level is 40 to 60 mg/kg under the condition of adding 1 200 U/kg phytase in the diet.

Key words： zinc; phytase; geese; growth and development; the tibia development; antioxidant capacity

Cite this article

GE Wenhua, KE Changjiao, ZHENG Huiwen, WANG Baowei, ZHANG Ming, YUE Bin, ZHANG Yangyang, REN Min . Effects of Straw Fodder with Low Zinc Level and Adding Phytase on Growth Performance, Tibia Development and Antioxidant Capacity of Wulong Geese Aged from 5 to 16 Weeks[J]. Chinese Journal of Animal Nutrition, 2017 , 29(7) : 2357 -2365 . DOI: 10.3969/j.issn.1006-267x.2017.07.018

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