Growth and conversion of feed in carp (Cyprinus carpio) with different supplies of protein and energy. 2. Bodyweight gains, efficiency of feed conversion, conversion of protein and energy

Schwarz, F.J.; Zeitler, M.H.; Kirchgessner, M.

Zeitschrift fur Tierphysiologie, Tierernahrung und Futtermittelkunde 49(2): 88-98


ISSN/ISBN: 0044-3565
Accession: 001083362

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2. Carp (Cyprinus carpio L.) with a mean liveweight of 168 g in aquaria received in two experiments (I and II) each 6 feed mixtures with 3 different protein and 2 different energy contents. The experiments lasted a total of 93 days (I) with a growth period 1 of 52 days and a growth period 2 of 41 days and of 106 days (II) with 61 and 45 days, respectively. The feed supply was on average 2% of the liveweight at a water temperature of 24 deg C per day. The carp were mean liveweight 660 g at the end of growth period 1 and 1150 g at growth period 2 in experiment I. The increase of the crude protein content in the food DM from 41.3 to 46.5 and 51.4% did not influence the growth rate. The daily gain, however, improved significantly in both growth periods when the digestible energy (DE) increased from 18.3 to 20.1 MJ/kg DM. In experiment II the carp weighed only 550 g, on average, at the end of growth period 1 and after period 2 were 890 g. The growth was not only decreased significantly by decreasing the protein supply (41.3 to 30.1 and to 19.9% in DM) but also by lowering the energy density (18.1 to 16.9 MJ DE/kg DM). The feed conversion (kg feed/kg gain) differed similarly to the growth rate in both experiments. The mean feed conversion was DM 0.9 kg/kg gain in I and 1.2 kg/kg gain in II. Protein efficiency ratio was distinctly impaired by increasing protein supply, whereas increase of the energy supply improved values. The mean conversion of DE per kg gain was not influenced by the protein supply in trial I, whereas in trial II that value was impaired by falling protein supply. Conversion value increased with the higher energy supply in experiment I whereas conversion decreased with rising DE from 16.9 to 18.2 MJ in experiment II.