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2005 | 13 | 2 |

Tytuł artykułu

Protein to energy ratios in African catfish fed purified diets: is Clarias gariepinus (Burchell) an ordinary carnivore?

Autorzy

Warianty tytułu

PL
Efekty żywienia suma afrykańskiego paszami o różnym stosunku białko-energia: czy Clarias gariepinus (Burchell) jest zwyczajnym drapieżnikiem?

Języki publikacji

EN

Abstrakty

EN
Six diets made from purified and semi-purified materials (casein, gelatin, gluten, zein, dextrin, α-cellulose) were tested over an 80-day period in adult (150 ± 47.40 g) African catfish, Clarias gariepinus (Burchell). Six protein to lipid ratios were tested ranging from 12.85 mg protein kJ⁻¹ to 20.51 mg protein kJ⁻¹. Performance indices (PWG, SGR, FCR) compare favorably with those previously observed for C. gariepinus and other clariid species. The best performing diets were those with a total gross energy range of 22 to 24 kJ g⁻¹, a P/E ratio of 19.5 - 20.5 mg protein kJ⁻¹, a crude protein level of 46%, a crude lipid level of 10-17%, and a carbohydrate level of 26 - 32%. The carbohydrate levels (26 - 32%) of the best performing diets during these experiments were much higher than those of previous researchers (16 - 18%) for the same species and still higher than those (15 - 25%) employed for other carnivores (salmonids, sea bass, sea bream). Therefore, African catfish possibly exhibits more efficient dietary carbohydrate utilization. An increase in carcass lipid as a result of increased dietary non-protein energy was also recorded.
PL
Celem badań było określenie wpływu żywienia młodocianego suma afrykańskiego, Clariais gariepi- nus (Burchell) sześcioma eksperymentalnymi paszami zawierającymi następujące ilości (% masy suchej) białka i tłuszczu: pasza 1 (32:10), pasza 2 (32:16), pasza 3 (40:10), pasza 4 (40:16), pasza 5 (46:10), pasza 6 (46:16) (tab. 2) na podstawowe wskaźniki hodowlane, chemiczny skład ciała i parametry hematologiczne. W obiegu recyrkulacyjnym przeprowadzono 80-dniowy podchów suma (objętość basenów podchowowych 50 l) o początkowej masie ciała 150 ± 47,40 g (tab. 1) - każdy wariant eksperymentalny (paszowy) podchowywano w trzech powtórzeniach. Najkorzystniejsze wartości wskaźników hodowlanych (np. względne tempo wzrostu masy ciała (SGR; % d⁻¹), współczynnik pokarmowy pasz (FCR), współczynnik wydajności wzrostowej białka (PER)), uzyskano w grupach żywionych paszami o zawartości energii brutto 22 - 24 kJ g⁻¹, stosunku białko-energia 19,5 - 20,5 mg białka kJ⁻¹ zawartości białka 46%, tłuszczu 10 - 17% i węglowodanów 26 - 32% (tab. 3). Poziom węglowodanów (26 - 32%) był istotnie wyższy niż w innych eksperymentalnych paszach stosowanych do podchowu tego gatunku (16 - 18%), czy też w paszach stosowanych do podchowu innych gatunków ryb drapieżnych (np. łososiowate, labraks, dorada). Wydaje się więc, że sum afrykański posiada efektywniejszy system utylizacji węglowodanów. Stwierdzono również istotny wpływ testowanych pasz na chemiczny skład ciała (szczególnie poziom tłuszczu) i parametry krwi suma afrykańskiego (tab. 4 i 5).

Wydawca

-

Rocznik

Tom

13

Numer

2

Opis fizyczny

p.157-170,ref.

Twórcy

  • Department of Agriculture, Animal Production and Aquatic Environment, University of Thessaly, Fytokou Street, Nea Ionia Magnisias, 384 46 Volos, Greece

Bibliografia

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Bibliografia

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