EFFECT OF SUBSTITUTION OF SUNFLOWER MEAL WITH FLAXSEED MEAL ON THE GROWTH PERFORMANCE AND CHEMICAL COMPOSITION OF MEAT IN COMMON CARP (CYPRINUS CARPIO L.)

G. Zhelyazkov, S. Stoyanova, Y. Staykov

Abstract: The aim of the study is to investigate the effect of substitution of sunflower meal with flaxseed 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 flaxseed meal, whereas fish from control group (CG) received feed, supplemented with sunflower 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 flaxseed and sunflower 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 fish. The final body weight of fish from experimental groups was as followed: EG –1272.50 ± 74.54 g and CG – 1222.50 ± 70.51 g, without statistically significant differences (P > 0.05). With respect to weight gain, the differences between groups were also insignificant (P > 0.05). Feed conversion ratio of fish from CG was 2.29 ± 0.17, significantly 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 fish meat from two groups (P > 0.05).

Keywords: chemical composition of meat; common carp (Cyprinus carpio L.); feed conversion ratio; flaxseed meal; intensity of growth; sunflower meal

Date published: 2017-09-29