A factorial ($4{\times}2{\times}2$) experimental design was employed to determine apparent digestibilities of dry matter (DM), protein, lipid, energy and nitrogen-free extract (NFE) of the test diets containing either ${\alpha}$-potato starch (A-PS), ${\beta}$-potato...
A factorial ($4{\times}2{\times}2$) experimental design was employed to determine apparent digestibilities of dry matter (DM), protein, lipid, energy and nitrogen-free extract (NFE) of the test diets containing either ${\alpha}$-potato starch (A-PS), ${\beta}$-potato starch (B-PS), ${\beta}$-corn starch (B-CS) or dextrin (DEX) as dietary carbohydrate energy for juvenile (average weight 30 g) and grower (average weight 300 g) rockfish reared at 13$^{\circ}C$ and 20$^{\circ}C$. Chromic oxide was used as an inert marker. Feces were collected by fecal collectors attached to rearing tanks from triplicate groups of juvenile and grower rockfish. Digestibilities of DM, energy and NFE of the test diets were significantly affected by dietary carbohydrate and water temperature (p<0.01), but not by fish size. DM digestibility of the fish fed the A-PS diet was significantly higher than that of fish fed other treatments, except for the DEX diet at 20$^{\circ}C$. DM digestibility of rockfish fed the B-CS diet was significantly lower than that of other diets. A similar pattern was observed in apparent digestibility of energy. NFE digestibility of fish fed the test diets was significantly affected by carbohydrate and significantly correlated to DM (r = 0.97, p<0.01) and energy (r = 0.99, p<0.01) digestibilities, regardless of water temperature and fish size. NFE digestibility of the fish fed the ${\beta}$-starch diets was relatively lower compared to that of the ${\alpha}$-starch diets, and ranged from 35 to 43% and 20 to 27% for B-PS and B-CS, respectively. The present findings indicate that carbohydrate and water temperature significantly affected digestibilities of dry matter, energy and nitrogen-free extract of rockfish. Among dietary carbohydrates, ${\alpha}$-potato starch could be effectively used as dietary carbohydrate energy for rockfish at 13$^{\circ}C$ and 20$^{\circ}C$.
A factorial ($4{\times}2{\times}2$) experimental design was employed to determine apparent digestibilities of dry matter (DM), protein, lipid, energy and nitrogen-free extract (NFE) of the test diets containing either ${\alpha}$-potato starch (A-PS), ${\beta}$-potato starch (B-PS), ${\beta}$-corn starch (B-CS) or dextrin (DEX) as dietary carbohydrate energy for juvenile (average weight 30 g) and grower (average weight 300 g) rockfish reared at 13$^{\circ}C$ and 20$^{\circ}C$. Chromic oxide was used as an inert marker. Feces were collected by fecal collectors attached to rearing tanks from triplicate groups of juvenile and grower rockfish. Digestibilities of DM, energy and NFE of the test diets were significantly affected by dietary carbohydrate and water temperature (p<0.01), but not by fish size. DM digestibility of the fish fed the A-PS diet was significantly higher than that of fish fed other treatments, except for the DEX diet at 20$^{\circ}C$. DM digestibility of rockfish fed the B-CS diet was significantly lower than that of other diets. A similar pattern was observed in apparent digestibility of energy. NFE digestibility of fish fed the test diets was significantly affected by carbohydrate and significantly correlated to DM (r = 0.97, p<0.01) and energy (r = 0.99, p<0.01) digestibilities, regardless of water temperature and fish size. NFE digestibility of the fish fed the ${\beta}$-starch diets was relatively lower compared to that of the ${\alpha}$-starch diets, and ranged from 35 to 43% and 20 to 27% for B-PS and B-CS, respectively. The present findings indicate that carbohydrate and water temperature significantly affected digestibilities of dry matter, energy and nitrogen-free extract of rockfish. Among dietary carbohydrates, ${\alpha}$-potato starch could be effectively used as dietary carbohydrate energy for rockfish at 13$^{\circ}C$ and 20$^{\circ}C$.
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문제 정의
For rockfish, Lee (2002) demonstrated that apparent digestibilities of dry matter, energy and protein of different dietary ingredients including white fish meal, anchovy meal, meat meal, feather meal, blood meal, corn gluten meal, cottonseed meal, wheat four, and brewer’s yeast significantly decreased as nitrogen-free extract (NFE) or fiber contents of ingredients increased, but the effects of water temperature on the digestibility was not evaluated. The aim of the present study therefore was to investigate the effects of dietary carbohydrate and water temperature on digestibities of nutrients and energy of juvenile and grower rockfish.
데이터처리
All data were subjected to analysis of variance (ANOVA), followed by Duncan’s multiple range test (Duncan, 1955) at a significance level of 0.05.
05. Correlation of nutrients and energy was assessed using Pearson Regression. All statistical analyses were carried out using SPSS version 14.
이론/모형
Fish scales contaminating in the fecal samples were removed using a 300 μm sieve before analyses. Crude protein was determined by Kjeldahl method using Auto Kjeldahl System (Buchi B-324/435/412; Flawil, Switzerland). Crude lipid was analyzed with ether extraction in a soxhlet extractor, crude fiber was determined by an automatic analyzer (Fibertec, Tecator, Sweden), and moisture was determined by a dry oven at 105℃ for 12 h.
Gross energy was analyzed by a bomb calorimeter (Parr, USA). Chromic oxide content in the experimental diets and fecal samples was determined by a wet-digestion method (Furukawa and Tsukahara, 1966). All chemical analyses from each tank were performed in triplicates.
성능/효과
Fish fed the B-CS diet was registered for the lowest value. NFE digestibility in the test diets ranged from 52% to 56%, from 40% to 53%, from 35% to 43%, and from 20% to 27% for the A-PS, DEX, B-PS, and B-CS diets, respectively. Within the fish fed the A-PS diet, no significant differences were observed in NFE digestibility at different water temperatures and fish sizes.
In conclusion, the findings of the present study indicate that both source and physical property of carbohydrate appeared to be an important factor that affects digestibilities of dry matter, energy and nitrogen-free extract of rockfish, followed by water temperature. Among carbohydrates tested, α-potato starch could be effectively used as dietary carbohydrate energy for rockfish at 13℃ and 20℃, and dextrin showed to be a good energy source at 20℃.
참고문헌 (37)
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