Nutritive value of cereals in feeds for common carp (Cyprinus carpio L.)
Przybyl, A.(August Cieszkowski Agricultural Univ., Poznan (Poland). Dept. of Inland Fisheries and Aquaculture)E-mail:[email protected] | Mazurkiewicz, J.(August Cieszkowski Agricultural Univ., Poznan (Poland). Dept. of Inland Fisheries and Aquaculture)
Four isonitrogenous (gross protein concentration 32%) and isoenergetic (gross energy content 4,080 kcal/kg) diets were prepared by extrusion to investigate the effects of different cereal grains (barley - diet A, wheat - diet B, triticale - diet C, rye - diet D) as carbohydrate compounds of extruded feeds for carp. The physical and chemical properties of the feeds were established. A 60-day growth test was performed, each diet was fed to three groups of fish (initial average weight 200+/-10 g). The following rearing effectiveness indices were used in the final evaluation of the growth test: weight gain (WG, %), specific growth rate (SGR, %/d), feed conversion ratio (FCR), protein efficiency ratio (PER) and protein retention (PR, %). The results obtained in the growth test did not show any significant differences in the evaluated feeds regarding their usefulness in the nutrition of carp. The recorded values were as follows: WG: 308.48-324.0%; SGR: 2.81-2.92%/d; FCR: 1.43-1.50; PER: 1.75-1.83; PR: 29.54-31.72%.
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