Effects of removing vitamins and trace minerals from finisher diets on production parameters, tibia strength and ash content in chicken bones
Journal Title: Animal Science Papers and Reports - Year 2016, Vol 34, Issue 3
Abstract
Vitamins and trace minerals are necessary nutrients for normal functioning of the organism. The experiment was set up with 1400 chicken, divided into 7 groups, which were fed diets with no vitamin additives or vitamin + trace minerals from day 30 to 42. These additives were excluded 12, 8 and 4 days before the end of the fattening process. The following production parameters were monitored: body weight, weight gain, feed intake, feed conversion and mortality. On that basis the production index was calculated. Slaughtering parameters, ash content and tibia strength in bone were monitored. It was assumed that sufficient quantities of trace minerals and fat-soluble vitamins would be stored in the body. Great amounts of water soluble vitamins cannot be generally accumulated, but chickens will continue to obtain them from natural feedstuffs, after exclusion of premixes. The results show that exclusion of vitamin-mineral additives had no negative effects on final body weight, but feed conversion rate deteriorated after these additives were excluded for 8 and 12 days. As for slaughtering parameters (except for abdominal fat) and tibia strength, there were no negative effects. Removing only vitamins had more negative effects on bone ash contents than it was observed for the simultaneous removal of vitamins and minerals.
Authors and Affiliations
Milanka Drinic, Aleksandar Kralj, Bozo Vazic
Keywords
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