Original scientific paper
THE INFLUENCE OF NUTRITIVE ANTIBIOTIC ON THE PRODUCTION RESULTS OF ONE-YEAR OLD CARP (CYPRINUS CARPIO)
Ivica Aničić
; Agronomski fakultet, Zavod za ribarstvo, pčelarstvo i specijalnu zoologiju, Zagreb, Republika Hrvatska
Tomislav Treer
; Agronomski fakultet, Zavod za ribarstvo, pčelarstvo i specijalnu zoologiju, Zagreb, Republika Hrvatska
Roman Safner
; Agronomski fakultet, Zavod za ribarstvo, pčelarstvo i specijalnu zoologiju, Zagreb, Republika Hrvatska
Abstract
The experiment was performed in four 2200 m² ponds, each of which was stocked with 10 000 one-year old carp fingerlings of the mean mass of 8,7 g. The fish in two of the ponds which served as the control ones, were fed on 32% protein pellets, while in the other two ponds they were getting same pellets with nutritive antibiotic "Virginiamycin" in concentration of 40 ppm. The water level was 180 cm, and statistical analysis proved good water quality. The experiment ran from August 20ᵗʰ to October 2ᶯᵈ 1991. At harvest, there was no significant difference (P>0,05) among the individual mass of carp from the four ponds. On the other hand, feed conversion rate was better in the ponds where the nutritive antibiotic was applied (7,2% - 16,7%). Although the percentage of survival was also 8% better, that was not statistically significant (P>0,05). Relatively low effects of the growth promoters could be due to small stocking density (4-5 fish m⁻²) that allowed natural food to predominate. This fact backs up the results of other researches, who believe that high nutritive value of natural food diminishes the nutritive activity of ,,Virginiamycin".
Keywords
Hrčak ID:
164858
URI
Publication date:
20.12.1993.
Visits: 846 *