Effect of Zataria multiflora boiss (thyme) extract on intestinal bacterial populations, meat cholesterol and carcass characteristics of broiler chickens fed diets with and without fat

Document Type : Research Paper

Authors

1 MS.c student, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

2 Associate professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

3 Assistant professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran

Abstract

This experiment was conducted using 240 one-day-old broiler chicks (Ross 308 strain) in a completely randomized design with 6 dietary treatments, each replicated 4 times with 10 birds/replicate. The dietary treatments were: 1, 2- diets without thyme extract (TE) with and without fat for the entire period of the experiment, 3, 4- diets with 0.5% TE with and without fat for the entire period of the experiment, and 5, 6- diets with 0.5% TE in last two weeks with and without fat. Weight gain (WG), feed intake (FI) and feed conversion ratio (FCR)) of chicks were measured as weekly basis. At day 42, two chicks were selected from each pen and slaughtered for microfloracount and thigh meat cholesterol measurement. Chicks fed diets supplemented with fat had higher body WG and FI, and lower FCR compared to diets without fat (P<0.05). Supplementation of TE did not show significant effect on performance of broiler chicks. Adding TE to the diets led to a significant reduction (83.76 vs. 85.64 mg/100 g) in thigh meat cholesterol content compared to the control (P<0.05). The lowest count (6.39 log10 CFU/g) for Escherichia coli and the highest count (7.2 log10 CFU/g) for Lactobacillus were belong to TE with fat (P<0.05). TE supplementation had no significant effect on the relative weights of carcass components and digestive organs (P> 0.05). As an overall conclusion, adding TE to the diets during the entire rearing period of the experimentled to significant reduction in thigh meat cholesterol in boiler chickens.

Keywords

References

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Animal Production Research
Volume 5, Issue 3
December 2016
Pages 1-10

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