Effects of frequency and time of feeding on growth and feed utilization in two asian catfishes, Pangasius bocourti (sauvage, 1880) and Pangasius hypophthalmus (sauvage, 1880)
In the first experiment Pangasius bocourti fingerlings were fed to satiation with the fequency of one, two or three meals. In the second (for P. bocourti) and third (for P. hypophthaimus) experiment, fish were fed equal fixed rations with four feeding frequency including one, two, three-meal frequency and continuous feeding in two feeding periods: day time or night time. The study shows that P. bocourti fingerlings fed to satiation, resulted in higher growth when meal frequency was increased from one to two or to three feeds per day but growth performance of two-meal or three-meal experiment fish was not significantly different. (SGR of 2.6%d-1; 3.4%d-1 and 3.6%d-1 for one, two and three-meal feeding, respectively). When fed an equal fixed ration (not to satiation) P. bocourti and P. hypophthalmus fingerlings show that growth performance and feed efficiency do not alter so much with increased meal frequency (SGR of 4.0%d-1; 4.0%d-1 and 3.9%d-1 3.4%d-1; 3.5%d-1; 3.4%d-1 when fed once, twice or thrice at night. However, one-meal frequency in the morning in both species tends to result in lower growth and smaller feed utilization efficiency than multiple feeding treatments. That is apparently not due to feeding frequency but likely due to time of feeding (daytime versus night time) since one-meal frequency during the night gave the same growth and feed efficiency as other feeding regimes. Continuous feeding in both species always led to reduced growth performance and feed utilization efficiency (SGR of 3.4%d-1 compared to 3.6%d-1 and 3.6%d-1 in two or three-meal feeding in daytime of P. bocourti). Clearly, increased meals in both species in fixed ration do not improve growth and feed utlization efficiency, significantly on the contrary a continuous feeding reduces growth and feed utilization efficiency. In this study nocturnal feeding in both species clearly exhibits higher growth and better teed utilization than diurnal feeding. The SGRs were 3.68-4.02%d-1 at night feeds when compared to 3.39-3.62%d-1 at daytime feeds of P. bocourti. Increased meal frequency and nocturnal feeding of an equal fixed ration usually resulted in relatively higher fat deposition in both species and a higher adipose-somatic and hepato-somatic index.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | L02 - Alimentation animale, |
| Online Access: | http://agritrop.cirad.fr/510515/ |
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