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The influence o f different contents o f vitamins and minerals in practical diets on performance indices was evaluated on 300 medium type BUT-9 turkeys divided into two groups, 3 replicates, consisting o f 25 toms and 25 hens in each. Practical diets used in both groups differed only in the content o f vitamins and trace minerals added: lower in group L , higher in group H . The turkeys o f group H were characterized by a higher live body weight (females at 15 weeks by 4.3%, and males at 22 weeks by 8.3%), consumed less feed, crude protein and A M E N per 1 kg o f live body weight, lower morta l i ty and carcass dressing percentage and breast muscle content. Toms o f this group slaughtered at 22 weeks, had more leaf fat in the body. K E Y W O R D S : turkeys, vitamins, trace minerals, performance I N T R O D U C T I O N A full expression of the genetic potential of turkeys is possible only when feed fully covers their nutritional needs. Due to a continuous and very fast breeding progress achieved in genetic improving of turkeys their nutrient needs should be currently updated (Benkova and Jankowski, 1995). This concerns also to vitamins and trace minerals added to feed mixtures (Nixey and Grey, 1989; Noy et al., 1994; Ward, 1993; Whitehead, 1995). In recent years higher, compared to 158 JANKOWSKI J., FARUGA A. the used so far, levels of vitamins and trace minerals for turkeys were recommended in the Nutrient Requirements of Poultry (1993). The purpose of this investigation was to evaluate the influence of higher contents of vitamins and trace minerals in mixtures for young turkeys on their performance and carcass characteristics. M A T E R I A L A N D M E T H O D S The study was conducted in the experimental farm of the Olsztyn University of Agriculture and Technology from February to July 1995. The experiment was made on 300 medium-type BUT-9 turkeys. The one-day old birds were divided at random into two groups (2 x 150 birds), 3 replicates, consisting of 25 toms and 25 hens in each. Group L turkeys were fed with mixtures containing premixes of a lower contents of vitamins and trace minerals than those used in Poland up to date (IB-1 and IB-2), while group H birds were fed mixtures containing premixes of higher vitamin and trace minerals contents (IB-IS, IB-2S and IB-3S). The T A B L E l V i t amin and trace mineral supplementation per 1 kg o f tested diets Ingredient IB1 IB2 I B I S IB-2S IB-3S Vitamins: A , I U 9000 600

journal of animal and feed sciences

A note on the performance of medium type turkeys fed on practical diets containing different levels of supplemental vitamins and trace minerals during the rearing period