Molecular Nutrition

Screening of Zinc-Enriched Microorganism and Its Relative Biological Value for Chickens

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  • School of Animal Science and Technology, Anhui Agricultural University, Hefei 230036, China

Received date: 2018-03-16

  Online published: 2018-10-20

Abstract

The purpose of this experiment was to screen out the microorganism that can efficiently transform inorganic zinc into microbial zinc, and to evaluate the biological value of the zinc source for feeding chickens. First, from the 16 strains of laboratory microorganisms available in the laboratory, strains with a high conversion rate to inorganic zinc were selected, and then the factors such as inorganic zinc concentration, culture temperature, culture time and inoculum quantity of bacteria were affected thought single factor optimization and orthogonal optimization. Then, twenty Hy-Line cocks at 18-week-old were randomly divided into 4 groups with 45 replicates per group and 1 chick per replicate. Chicks in the control group 1 and control group 2 fed the inorganic zinc (ZnSO4·7H2O), dietary zinc contents were 60 and 90 mg/kg, respectively; chicks in the test group 1 and test group 2 fed the yeast zinc, dietary zinc contents were 60 and 90 mg/kg, respectively. Each the pre trial period and the trial period were 5 days. The results showed that No.58 strain (Saccharomyces cerevisiae) was the optimal inorganic zinc transforming strain, its inorganic zinc to microbial zinc conversion rate was 52.68%; under the condition of inorganic zinc concentration 1.5 mg/L, inoculum quantity of bacteria 4% and temperature 28℃ cultured for 66 h, the inorganic zinc to microbial zinc conversion rate could add up to 98.01%. Used the zinc-enriched yeast (yeast zinc) transform by the strain fed to chickens, the relative biological value of zinc in yeast zinc relative to zinc in zinc sulfate was 114.83%. In conclusion, No.58 strain is a zinc-enriched microorganism with a high conversion rate to inorganic zinc.

Cite this article

WEI Ailian, DAI Zhangchao, LU Chen, DING Xiaoling, DIAO Huan, YAN Yibo, LI Lyumu . Screening of Zinc-Enriched Microorganism and Its Relative Biological Value for Chickens[J]. Chinese Journal of Animal Nutrition, 2018 , 30(10) : 4219 -4228 . DOI: 10.3969/j.issn.1006-267x.2018.10.048

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