Effects of Zinc Sulfate on Feed Intake and Growth of Growing Pigs

SUN Renjie; HAN Xiao; CUI Huawei; WANG Kunkun; WANG Yongxia

doi:10.3969/j.issn.1006-267x.2014.07.026

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 7: 1925 - 1934

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.07.026

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Effects of Zinc Sulfate on Feed Intake and Growth of Growing Pigs

SUN Renjie ,
HAN Xiao ,
CUI Huawei ,
WANG Kunkun ,
WANG Yongxia

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1. College of Animal Science and Technology, Zhejiang A & F University, Lin'an 311300, China;
2. Key Laboratory for Molecular Animal Nutrition of Ministry of Education, College of Animal Science, Zhejiang University, Hangzhou 310029, China

Received date: 2014-01-14

Online published: 2014-07-01

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Abstract

The objective of this experiment was to investigate the effects of zinc sulfate on feed intake and growth of growing pigs. A total of 120 cross-bred (Duroc×Landrace×Yorkshine) pigs with similar body weight were randomly divided into 4 groups (control group, trial groups Ⅰ, Ⅱ and Ⅲ), each of which included 3 replicates of 10 pigs (half males and half females). These 4 groups received the same basal diet supplemented with 60, 300, 1 000 or 3 000 mg/kg of zinc (as ZnSO₄·7H₂O), respectively. The experiment lasted 16 days. The results showed as follows: compared with the control group, 1) diet supplemented with zinc sulfate significantly improved average daily gain and decreased the ratio of feed to gain (P<0.05); 2) average daily feed intake at 7 to 16 days in trial group Ⅲ and 13 to 16 days in trial group Ⅱ was significantly increased (P<0.05); 3) the apparent digestibility of crude protein in trial group Ⅲ was significantly increased (P<0.05), and the apparent digestibility of crude fiber in trial groups Ⅲ and Ⅱ was significantly decreased(P<0.05); 4) the contents of serum IgG and IgM were significantly improved in trial groups Ⅲ and Ⅱ (P<0.05); 5) the activities of amylase and lipase in duodenum were significantly increased in the trial group Ⅲ (P<0.05); 6) the pigs in trial groups Ⅲ and Ⅱ had higher villous length and villous length/crypt depth as well as lower crypt depth of duodenum and jejunum (P<0.05); 7) the contents of plasma gastrin, insulin and neuropeptide Y of pigs in trial group Ⅲ were significantly increased (P<0.05). The results of this study indicate that the addition of high level of zinc sulfate can improve feed intake and growth performance of pigs through enhancing immunity and nutrient apparent digestibility, protecting intestinal mucosal morphology and stimulating the secretion of digestive enzymes, gastrin, insulin and neuropeptide Y.

Key words： zinc sulfate; growing pigs; feed intake; intestinal mucosal morphology; neuropeptide Y

Cite this article

SUN Renjie , HAN Xiao , CUI Huawei , WANG Kunkun , WANG Yongxia . Effects of Zinc Sulfate on Feed Intake and Growth of Growing Pigs[J]. Chinese Journal of Animal Nutrition, 2014 , 26(7) : 1925 -1934 . DOI: 10.3969/j.issn.1006-267x.2014.07.026

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