EFFECT OF SUBSTITUTION OF SUNFLOWER MEAL WITH FLAXSEED MEAL ON THE GROWTH PERFORMANCE AND CHEMICAL COMPOSITION OF MEAT IN COMMON CARP (CYPRINUS CARPIO L.)
2015
Staykov Y. | Zhelyazkov G. | Stoyanova S.
The aim of the study is to investigate the effect of substitution of sunfl ower meal with fl axseed meal in pellets on the growth performance and chemical composition of meat in common carp (Cyprinus carpio L.), cultivated in recirculation system. Fish from both experimental variants with a started live weight 1058.38 ± 60.73 – 1077.13 ± 59.67 g were reared in concrete tanks, with effective water volume of 0.8 m3, part of a recirculation system. The carps from experimental group (EG) were fed a diet, containing fl axseed meal, whereas fi sh from control group (CG) received feed, supplemented with sunfl ower meal. Pellets were 6 mm of size and crude protein content of 26.06% and 26.35%. The duration of the experiment was 60 days. To evaluate the effect of dietary fl axseed and sunfl ower meals on the weight gain (g) of carps, control catches were conducted at 15-day intervals. Live body weight (g) was determined by individual weighing of fi sh. The fi nal body weight of fi sh from experimental groups was as followed: EG –1272.50 ± 74.54 g and CG – 1222.50 ± 70.51 g, without statistically signifi cant differences (P > 0.05). With respect to weight gain, the differences between groups were also insignifi cant (P > 0.05). Feed conversion ratio of fi sh from CG was 2.29 ± 0.17, signifi cantly higher by 19.27%, than this one of carp from control group (P < 0.05). There were no considerable differences in water content, as well as the proportions of protein, fat, dry matter and mineral substances of fi sh meat from two groups (P > 0.05).
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