Effect of palm kernel cake levels on growth performance of the nile tilapia
(Oreochromis niloticus Linn.)
ผลของระดับกากเนื้อเมล็ดในปาล์มน้ำมันต่อการเจริญเติบโตของปลานิล
Nirut Sukkasame, M.Sc. Student in Aquatic Sci., PSU.
Wutiporn Phromkunthong, Assoc. Prof., D. of Aquatic Sci., F. of Natural Resources, PSU.
Corresponding e-mail : pwutipor@ratree.psu.ac.th
Grant : Graduate School, PSU.
Presented : The 26th Congress on Science and Technology of Thailand, 18-20 October 2000,
Bangkok
Key words : palm kernel cake, growth, nile tilapia
Male tilapia (GMT) with initial average weight 2.5 g were reared in 10-week experiment using three levels, i.e. 0, 15 and 30% of palm kernel cake (PKC) with the digestible energy 330, 360 and
390 kcal/100 g feed. The levels of PKC in the feed produced no effect on fish growth, survival, food conversion ratio (FCR), protein efficiency ratio (PER) and net protein utilization (ANPU). Also note was that there were no differences in FCRs, protein efficiency ratios, and net protein utilization when the fed contained different digestible energy. However, the best growth performance was obtained
with the energy level 330 kcal/100 g feed (p<0.01). It was also recognized that the reaction between the PKC and energy levels affected the PER (p<0.01). The chemical composition regarding the pro-tein and fat levels in the fish were different for different treatments (p<0.01), also noted was the difference in digestive efficiency (p<0.01). No effects were produced on the survival, blood composition, i.e. hematocrit, hemoglobin, plasma protein and hepatic index when the feeds containing different levels of PKC and energy were used. Taking into account the feed production cost and other effects, conclusion is made that the supplementation of 30% PKC with 330 kcal/100 g feed is most benificial.
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