Phytase as additive to animal diet and its influence to dressing traits of meat

Abstract

The aim of examination in this work was: scientific determination of data about influence of phytase added into diets for fattening chickens, by lower level of mineral source of phosphorus to the finishing body weights had to some slaughtering traits of meat. Experimental examinations were done through the experiment of feeding fattening chickens of Arbor Acres strain. In the experiment were 220 chickens, divided into two groups, considering the different formulation of diets. K-control group (110 chickens), as the source of phoshorus gained by diet dicalcium-phosphate (DKF) at level 2%, O-I group gained by diet DKF-1% with addition of 0,1% enzyme of phytase. Standard fattening technology was applied in lasting period of 42 days. At the end of experiment, 14 head of animals were sacrificed (7 male and 7 female) out of each group. Necessory measuring were done: body weights before slaughtering; weight of dressed warm carcass; weight of the basic parts of carcass. Dressing percentages were calculated as well as yield and share of the basic parts considering dressed carcasses. Gained results show that the chickens of O-I group (DKF-1%+0,1% of phytase) gained better finishing body weights (2006,50gr) in comparison to K-group (DKF-2%)-1875,63gr (P<0,05). Also O-I group had better dressing percentages (65,66%), K-group (63,16%) (P<0,05). Further, yield of meat of the first category, by O-I group (771,56gr) and K-group (694,79gr) (P<0,05).