A Quantitative Genetic Analysis of Six Phenotypes in Oreochromis niloticus in Different Olds
Heritability estimates were determined for six phenotypes in Oreochromis niloticus for 180, 210 and 300 days old: body weight (BW),
total length (TL), standard length (SL), body height (BH), caudal tail height (CTH) and head length (HL). Heritability estimates were
calculated by half-sib analysis from an experiment that contained 3 paternal half-sib families and 11 full-sib families. Heritabilities ranged
from 0.00-0.88. These results suggest that because heritabilities of BW, TL, SL, BH, CTH and HL for sires in Oreochromis niloticus for 180
and 210 days old are low, family selection or progeny testing can proposed for selection. But, therefore heritabilities of all traits both male
and female for 300 days old are high, selection will propose for are mass selection.