Abstract
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
Highlights
A full expression of the genetic potential of turkeys is possible only when feed fully covers their nutritional needs
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)
Because of manganese deficiency frequently occuring in turkeys, amount of manganese in premixes used in group H was increased approximately 50%, as compared to recommendations of Nutrient Requirements of Poultry (1993)
Summary
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 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 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
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