Evaluation of apparent digestibility of magnesium in relation to body weight, growth rate and phytase enzyme in B line of Arian broilers

This study was performed to investigate the relationship between apparent digestibility of magnesium (Mg) with body weight, feed intake and phytase enzyme with 120 individual B-line Arian male broilers. Birds were assigned two standard diets and a diet supplemented with one gram of phytase (FTU / 500 kg). Daily feed intake, weekly weight gain, feed conversion ratio during rearing and Mg digestibility were measured at 28 to 30 days. Using Gompertz model, growth rate (c), initial weight (b) and maximum growth potential (m) were analyzed. Growth rate and maximum growth potential were higher in the group fed phytase enzyme (P <0.05). Weight gain and feed conversion ratio improved under the effect of phytase supplemented diets (P <0.05). Magnesium digestibility was higher in phytase enzyme diets than standard basal diets (P <0.05). The results showed that the modeled growth rate affected the Mg digestibility, so that birds with higher growth rate (faster growth potential) had more potential for Mg digestion (P<0.05). The relationship between Mg digestibility and body weight gain was positive and with increasing Mg digestion, weight gain improved (P<0.05). Birds with higher growth potential have the ability to digest more Mg, and this digestibility is increased by the use of the phytase enzyme. Therefore, in the breeding programs of Arian chickens, more attention can be paid to the relationship between the use of Mg and the growth rate parameter.