降低铜、锌含量添加植酸酶对育肥猪生长性能、养分表观消化率及血清生化指标的影响

doi:10.16431/j.cnki.1671-7236.2018.11.015

Abstract

Abstract:

This experiment was conducted to investigate suitable Cu and Zn contents for finishing pigs.One hundred and eight Su Jiang pigs with about 55 kg body weight were randomly divided into 6 groups with 3 replicates per group and 6 pigs per replicate by 2×3 factor design.The low-,medium-,and high-dose Cu and Zn combined with phytase addition and no addition were assigned to 6 diets,one for each group.The trial lasted for 42 d.The growth performance,nutrients apparent digestibility,serum biochemical indexes,and Cu and Zn contents in serum and metacarpals of finishing pigs were tested.The results showed that the growth performance of finishing pigs were not significantly affected by reducing Cu and Zn contents or supplementing with phytase (P>0.05).The apparent digestibility of Cu and Zn were extremely significantly increased (P<0.01) and the serum Cu content was extremely significantly decreased from high dose to medium dose or low dose (P<0.01).The activity of alkline phosphatase (AKP) in serum was extremely significantly decreased by decreasing the content of Cu and Zn from high to medium dose (P<0.01).The apparent digestibility of crude protein was extremely significantly increased (P<0.01),and the Zn apparent digestibility and AKP activity were significantly increased (P<0.05) by the addition of phytase.Zn content in serum and metacarpals,the activities of ceruloplasmin and lactate dehydrogenase (LDH) in serum were not significantly affected by the content of Cu and Zn and phytase addition (P>0.05).In conclusion,reducing Cu and Zn contents to medium level in high phytate diet could increase the apparent digestibility of Cu and Zn,but had no adverse impact on growth performance.Adding phytase in the diet could increase Zn and crude protein apparent digestibility.Therefore,moderate contents of Cu and Zn was 25 and 40 mg/kg,and phytase were recommended to add in diet of Su Jiang finishing pig.

Key words: Cu; Zn; phytase; finishing pig; growth performance; nutrient apparent digestibility; serum biochemical indexes

CLC Number:

S828

REN Shanmao, ZOU Yichen, TAO Yong. Effects of Decreasing Cu and Zn Contents and Supplementing with Phytase on Growth Performance, Nutrients Apparent Digestibility and Serum Biochemical Indexes of Finishing Pigs[J]. , 2018, 45(11): 3095-3103.

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Effects of Decreasing Cu and Zn Contents and Supplementing with Phytase on Growth Performance, Nutrients Apparent Digestibility and Serum Biochemical Indexes of Finishing Pigs

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