alexa Effects of different protein and energy supplies on carcass composition of carp (Cyprinus carpio L.)
Agri and Aquaculture

Agri and Aquaculture

Fisheries and Aquaculture Journal

Author(s): Margit H Zeitler, M Kirchgessner, FJ Schwarz

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In two trials (I and II) carp (Cyprinus carpio L.) kept in tanks were given six feed mixtures, with respectively a protein content at three different levels and an energy content at two levels. Both trials were divided into two growth periods. In period 1 live weight increased from 170 g to about 600 g and in growth period 2 from about 600 g to 1000 g. At the end of each growth period six carp per treatment were killed without any losses and used for carcass analysis. An increase of the crude protein content from 41.3 to 46.5 to 51.4% in the feed dry matter (DM) (trial I) did not influence the carcass composition of the carp, whereas a simultaneous increase of the energy content in the feed from 18.3 to 20.1 MJ digestible energy (DE)/kg DM influenced all parameters examined. With increasing energy supply the fat content, and with it the energy content, of the carcasses increased, while the water, ash and protein contents decreased. The energy increase in trial II from 16.9 MJ DE/kg DM to 18.2 MJ DE/kg DM had a similar effect on the carcass composition. In trial II the protein content of the diet very strongly influenced the nutrient contents of the carp as the protein content was reduced from 41.3 to 30.1 to 19.9% in the feed DM. The water and protein contents of the carcass decreased with decreasing protein supply, while the fat content, and with it the energy content, showed a significant increase. Interactions of the protein supply and energy supply were not found in the carcass composition. However, the different nutrient contents in the carcasses are relatively closely related to each other. Of all the nutrients the carcass fat content showed the greatest differences, varying from 6.7 to 17.6% depending on the treatment (trials I and II, growth period 2). The differences were much less significant for the protein content (14.2 to 16.1%) and for the ash content (2.5 to 3.1%). The energy content of the carcasses varied from 24.4 to 28.3 MJ/kg DM.

This article was published in Aquaculture and referenced in Fisheries and Aquaculture Journal

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