A 90-day feeding trial was conducted on milkfish, Chanos chanos with an initial mean body weight of 3.07 ± 0.17 g (mean ± standard error of mean). Six treatment diets were formulated to contain 0 g/kg (Diet 1), 150 g/kg (Diet 2), 25 g/ kg (Diet 3), 300 g/kg (Diet 4), 350 g/kg (Diet 5) and 450 g/kg (Diet 6) distiller's dried grain with soluble (DDGS). All the dietary treatments were isonitrogenous (350 g/kg crude protein) and isolipidic (6% crude lipid). Result of the feeding trial indicated that growth rates, feed intake and feed efficiency were not significantly (p > .05) affected by inclusion levels of DDGS by up to 450 g/kg in the feed.Proximate body composition (crude protein, crude lipid, ash, fibre) in fish fed the dietary treatments were not significantly (p > .05) affected as well. The DDGS when used as a milkfish ingredient has a protein digestibility of 910 g/kg, fat disgetsibility of 850 g/kg, carbohydrate digestibility of 750 g/kg and a dry matter digestibility of 520 g/kg Results from the intestinal morphology displayed no apparent pathological changes in the digestive tract of fish fed all dietary treatments. These results indicate that DDGS can be efficiently utilized by milkfish by up to 450 g/kg without negatively affecting performance parameters and intestinal morphology.
K E Y W O R D SChanos chanos, digestibility, distiller's dried grains with soluble, intestinal morphology
Spray-dried haemoglobin meal, a by-product and derivative of the swine processing industry, is formed when haemoglobin is separated hygienically from pig's blood. A 120-days feeding trial using snub nose pompano Trachinotus blochii (1.01 ± 0.02 g) tested spray-dried haemoglobin meal (SHM) as an ingredient in six iso-nitrogenous (crude protein of 50%) and iso-lipidic (crude fat of 8%) diets, namely, a diet with 0% SHM (control) and five diets replacing fishmeal with SHM at 4, 8, 12, 16 and 20%.Weight gain percentage (WG%) significantly decreased (p < 0.05) when fish were fed diets with 12, 16 and 20% SHM inclusion levels. Feed conversion ratio and survival significantly decreased (p < 0.05) when fish were fed diets with 16 and 20% SHM inclusion levels. However, visceral somatic index, hepatosomatic index, condition factor and proximate composition were not affected (p > 0.05) by SHM inclusion levels. As an ingredient for pompano feed, SHM has digestibilities for protein, lipid and dry matter at 89, 78 and 45% respectively. No apparent pathological changes were observed in the intestines. However, physiological changes in the liver have been seen in fish fed diets containing 12, 16 and 20% of SHM. Based on the quadratic regression model at the maximum response of weight gain percentage, the optimum inclusion level of SHM was estimated to be 3.08% (5.87% SHM protein in the diet).
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