Effect of Probiotics and Avotan on the Level of Thyroid Hormones in the Blood Plasma of Broiler Chickens

1 Institute of Animal Science, BG - 2230 Kostinbrod, Bulgaria
2 Trakia University, Department of Animal Morphology, Physiology and Nutrition, Faculty of Agriculture, BG -6000 Stara Zagora, Bulgaria


CHOTINSKY, D. and R. MIHAYLOV, 2013. Effect of probiotics and Avotan on the level of thyroid hormones in the blood plasma of broiler chickens. Bulg. J. Agric. Sci., 19: 817-821


A feeding experiment was conducted to evaluate the effects of Lacto Sacc, Yea Sacc and Avotan in the diets on the level of thyroxin, triiodothyronine and thyrotrophin hormone in the blood plasma of broiler chickens. Six hundred day old commercial broiler chickens were weighted and assigned randomly in four dietary treatments: 1. a basal diet (control); 2. a basal diet + 0.1 % Lacto Sacc; 3. a basal diet + 0.1 % Yea Sacc ; 4. a basal diet + 0.01 % Avotan. Each dietary treatment had three replicates with 50 broiler chickens per replicate.
The quantity of thyroxine did not change significantly in the supplementation of 0.1 % Lacto Sacc, 0.1 % Yea Sacc and 0.01 % Avotan in the diets of broiler chickens.
The level of triiodothyronine in the blood plasma increased insignificantly with the supplementation of 0.01 % Avotan, while this level significantly increases in the supplementation of 0.1 % Lacto Sacc and 0.1 % Yea Sacc in the diets of broiler chickens.
Plasma thyrotrophin levels were nоt significantly different between untreated and treated broiler chickens.

Key words: probiotics, Avotan, broiler chickens, thyroid hormones

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