Production effectivity of feed mixtures with the probiotic Enterococcus faecium to the quality of layers eggs

In a trial with hens of laying type Isa Brown we tested the influence of the probiotic preparation IMB 52 by measuring the weight of yolk, the weight of white and the content of minerals in yolk and white. The experiment was performed in a four group laying test with 3 repeatings, with the total number of 432 hens aged 24 weeks. The chickens were divided to one control group and three trial groups. They were enclosed in three platen cage technology. For the feeding we used a feed mixture of maize, soybean meal, rape seed oil with an addition of minerals and vitamins. The trial groups were fed with the addition of the probiotic preparation IMB 52 (Biomin GmBH Company, Austria) based on Enterococcus faecium in different concentrations. The feed for group A contained 2.5.1011, the second for group B contained 5.0.1011 and third for group C contained 1.1012 cfu/t. Observed values in trial groups were always compared to control group. The lowest value of egg weight was registered in the control group (62.77 g). In all trial groups higher values were observed, in the C group 63.03 g, in the B group 63.45 g and in the A group 63.65 g. Differences between control group compared to A and B group were statistically significant (Pless than 0.05). The yolk weight, as well as the egg weight, were lowest in the control group (19.08 g), but highest in group B (16.16 g). The content of Ca, P, Mg, Fe and Zn in the original dry matter did not confirm a definite tendency of change in the dependence of the trial interference. The content of Ca and P in yolk was higher in the groups with the probiotic preparation, the content of Mg and Zn in yolk was higher in the control group. Statistically significant decreased values were noticed only between the control group and the trial B group concerning the content of Mg and Zn (P more than 0.05). The content of K in white was significantly decreased in all trial groups compared to the control group (Pless than 0.05).