Effect of betaine and strain on the performance and expression of betaine--homocysteine S-methyltransferase in broiler chickens exposed to natural drinking water with different levels of total dissolve soiled

The aim of this study was to investigate the effects of adding betaine to diets of Ross and Arian strains that received drinking water with total concentration of TDS. 720 single-day broiler chicks, Ross and Arian strains were distributed in 12 experimental units for six weeks. The experiment was conducted in a completely randomized design with factorial arrangement (2 × 2 × 3) containing two levels of additive betaine (0 and 0.2% diet) and three levels of TDS (400, 2000 and 3500 mg / l) with four replicates and 15 chicks in Every repetition was done on the seventh day. . With the increase in TDS water content, the body weight of the chicks decreased, and the conversion factor of food and water consumption increased. Additive betaine had a significant effect on the increase in weight and water consumption during the durability period. The percent mortality and moisture content of the waste was higher in treated water with higher TDS. The amount of moisture was reduced by the addition of betaine. The effect of adding betaine and increasing TDS on the concentration of sodium chloride in chicks was significant at 28 days of age (P <0.05). By increasing TDS in drinking water, the BHMT enzyme gene expression in the liver of the chicks also decreased in the Arian strain relative to the Ross strain. The gene expression increased with the addition of betaine to the ration of chicks.