Macro- and micrometer indices in hens-layers after addition to low energy forage of «Rovabio» enzymatic preparation

The authors estimate the efficiency of low energy rations for hens-layers of the Highsex-white cross during the use of feed mixture balanced on wet protein, raised content of bran and the addition of «Rovabio» enzymatic preparation. The intensity of live weight gain, absolute and relative intestine mass and caryocytometer indices of epithelium of kidney canaliculus were determined in hens-layers of 20-60 weeks of age. It was shown, that allowable level of the reduction of metabolic energy concentration in ration is 2400 kkal per kg. The use of feed do not decrease of live weight and do not cause irreversible morphological changes in digestive and eliminative organs of birds.