engleski

EFFECT OF INCREASED LEVELS OF VITAMIN A IN FEED ON QUANTITY AND QUALITY OF ABDOMINAL FAT IN CHICKENS UNDERGOING FATTENING PROCESS

The research involved a total of 280 fattening chickens (Hybro) divided between two identical experiments (4 groups of 40, and 4 groups of 30 chickens), with the aim of investigating reproducibility of data. During the 42-day course of fattening the effect that increased levels of vitamin A in chicken feed had on the quantity and quality of abdominal fat was researched. Control groups of chickens were fed on commercial starter and finisher rations containing the standard level of vitamin A (12.500 and 10.000 i.u.). The three experimental groups of chickens were fed on starter and finisher rations containing the same nutritional values but with an increased level of vitamin A (25.000, 37.500, 50.000 i.u. in starter rations and 20.000, 30.000 and 40.000 i.u. in finisher rations). Measuring of abdominal fat in chickens conducted at the end of both experiments showed that increased levels of vitamin A in feed resulted in no significant increase (P<0.05) of fat share in overall body mass when compared with the control group of chickens. Results of quality control of abdominal fat (peroxide number and degree of acidity) also showed no significant difference (P<0.05) between control and test groups of chickens.

feed; fattening; vitamin A; and abdominal fat; chicken

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