Effect of Thyme (zataria Multiflora) Extract and Probiotic (broilact) Feeding on Blood Thyroid Hormones Concentration and Growth Hormone Gene Expression of Liver in Broiler Chickens
نویسندگان
چکیده
This study was conducted to examine the effects of thyme extract and probiotic on biological growth promoters. Therefore blood thyroid hormones (T3 and T4) concentration and growth hormone (GH) gene expression were measured. 108 one-day-old Ross male broiler were randomly allocated in 3 experimental treatments including: controlunsupplemented (CTRL), birds supplemented with Zataria multiflora extract (Thy) and probiotic in feed (Pro). Each treatment had 3 replicates of 12 broilers. The birds were fed on a cornsoybean based diet. T3 & T4 concentrations and GH gene expression in liver were determined. At 42 day of age T3 concentration not significantly changed in treatments (P>0.05). T4 concentration was significantly higher in Pro compared to Thy (P<0.05). GH gene expression in Pro birds significantly increased compared with CTRL and Thy birds (P<0.05) and thyme extract had no effect on GH gene expression and T3 and T4 (P>0.05). It may be concluded that dietary supplementation of probiotic may influence the biological growth promoters so T3 & T4 concentrations and GH gene expression in broiler and thyme extract had no effect on this biological parameters. Researchers indicated that some phytogenic extracts or probiotics improve growth performance.
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