Muhammad Hunaina Fariduddin Aththar

The ability of the animal to cope with environmental changes may be measured by log-transformed variance of deviations from expected weights (LnVar). We calculate LnVar by fitting the expected individual growth curve based on longitudinal weights (LnVar _ind ) of Nile tilapia that were grown in either an aerated or a non-aerated freshwater pond. We estimated genetic parameters for LnVar _ind in Nile tilapia, the genetic correlation between LnVar _ind and growth and the genetic correlation for LnVar _ind between aerated and non-aerated pond. The heritability estimate for LnVar _ind (0.28) in the non-aerated pond was higher than in aerated pond (0.06). In the aerated pond, genetic correlations of LnVar _ind were − 0.44 ± 0.23 with daily growth coefficient (DGC) and − 0.45 ± 0.24 with harvest weight (W ₅ ). In the non-aerated pond, genetic correlations with DGC and W ₅ were − 0.68 ± 0.12 and − 0.52 ± 0.17, respectively. These values suggest that selection for fish with high growth rate will reduce LnVar _ind . However, genetic correlation of LnVar _ind between aerated and non-aerated pond was 0.50, suggesting that genetic improvement in the aerated environment will reduce LnVar _ind in the non-aerated environment. Therefore, incorporating records from relatives in non-aerated pond is beneficial for breeding programs targeting this environment.

The proceedings of the 12th World Congress on Genetics Applied to Livestock Production provide you with 816 papers representing the leading research in livestock genetics around the globe. This boo...