Abstract
In the present study, seventy-two 30-week-old laying hens (Brown Hisex) were separated into two groups (control and treatment) and fed with a standard layer diet. In the treatment group the amount of effective microorganism (EM) added to the drinking water is equal to1000 ppm EM dose. Throughout the 8-week study period, 16 h thermoneutral (20-22 ºC) and 8 h hot (35-37 ºC) environmental temperature regime was applied daily. The results indicated that EM supplementation affected performance and some egg quality characteristics of layers exposed high environmental temperature. Feed intake and conversion ratio, yolk index, albumen index, yolk colour b, Haugh unit were decreased by supplemental EM. Serum glucose, cholesterol, triglycerides, calcium, total oxidant- antioxidant concentration were not affected by EM. It is concluded that EM supplementation in laying hens could have potential to improve feed intake and feed conversion ratio under high environmental temperature. However, supplemental EM with drinking water decreased some egg quality parameters.
Highlights
effective microorganism (EM) are a mixed culture of microorganisms which could be consisted of yeasts, lactic acid bacteria, actinomycetes and photosynthetic bacteria
This study aims at reducing the negative effects of high ambient temperature on performance, egg yield, egg weight, egg quality of laying hens together with immune system problems, by means of EM application
The results obtained in the experiment showed that adding in water EM had significant effects on feed intake and feed conversion ratio in laying hens. (p
Summary
EMs are a mixed culture of microorganisms which could be consisted of yeasts, lactic acid bacteria, actinomycetes and photosynthetic bacteria. The EMs may show their effects via suppression of the growth of pathogenic bacteria and aid digestion (Higa & Parr, 1994). Using EM in poultry feed helps equilibrate microbial flora in the intestines, prevent intestinal pathogens to bind to epithelium and improve weight gain. Chotisasitorn et al (1997) identified that it was possible to improve egg production, specific gravity and feed conversion rate in laying hens by means of EM usage. It was found by Thach et al (2014) that eRBCA-2020-1351
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