THE EFFECT OF ADMINISTRATION OF LOOSE FEE DING CONCENTRATES AND WHOLEWHEAT-GRAIN ON EFFICIENCY OF LAYING HENS

Two trials were conducted with laying hens heavier body type (Hisex Br own) and lighter body type (Shaver 579). Each of three groups comprise d 90 laying hens and they were administered complete loose feed mixtur e intended for laying hens (169 g of protein, 11.3 MJ ME/kg) in contro l groups and experimental groups were fed with loose concentrate I (20 0 g of protein, 10.4 MJ ME/kg), or concentrate II (269 g of protein, 7 .5 ME ME/kg) in combination with whole wheat grain (60% of concentrate I + 40% of wheat), respectively, or 32% of concentrate II + 68% of wh eat). Calculated content of nutrients in these combinations ranged fro m 165 to 170 g of protein and from 10.8 to 11.2 MJ ME/kg. In an indepe ndent group of one of trials the daily supplement of whole grain wheat to the complete feed mixture in ratio 900 g of mixture + 100 g of who le-grain wheat/kg. Experimental interventions had no effect on egg pro duction of hens. The weight of eggs increased (trial I - statistically significantly, P < 0.05), feed consumption per day and egg (trial II - statistically significantly, P < 0.05) in reduction of efficiency of feed. The supplement of whole-grain wheat to the complete feed mixtur e had no statistically significant effect on assessed indicators. Expe rimental interventions had indifferent effect on egg quality (Haugh's units of egg white). Energy intake in experimental groups increased by 3 to 6 %, the weight of gizzard increased numerically. The costs of f eeds in experimental groups decreased by 7.4 to 17.6%, that is due als o to savings of 75% of electric energy for grinding of wheat. Combined administration of loose concentrates and whole-grain wheat may be con sidered as an alternative system of feeding of laying hens by which th e breeder utilizes his own sources of cereals in production of heavier eggs particularly from genetically heavier body types of hens.