Genetic parameters for uniformity of harvest weight and body size traits in the GIFT strain of Nile tilapia

Table 2 Genetic parameters for level of harvest weight, length, depth, and width

Parameter	Harvest weight	Length	Depth	Width
^a \( \upsigma _{{{\text{A}}_{ } }}^{2} \)	573.46 (115.80)	0.732 (0.136)	0.202 (0.037)	0.034 (0.007)
\( \upsigma _{{{\text{e}}_{ } }}^{2} \)	1426.3 (27.99)	1.443 (0.028)	0.365 (0.007)	0.067 (0.001)
\( \upsigma _{{{\text{g}}_{ } }}^{2} \)	300.26 (42.81)	0.354 (0.047)	0.104 (0.012)	0.037 (0.004)
\( \upsigma _{{{\text{k}}_{ } }}^{2} \)	240.29 (35.45)	0.235 (0.035)	0.047 (0.008)	0.013 (0.002)
\( \upsigma _{{{\text{m}}_{ } }}^{2} \)	43.64 (20.83)	–	0.013 (0.006)	–
\( \upsigma _{{{\text{P}}_{ } }}^{2} \)	2297.2 (70.78)	2.418 (0.081)	0.631 (0.022)	0.136 (0.005)
\( {\text{h}}^{2} \)	0.25 (0.04)	0.30 (0.05)	0.32 (0.05)	0.25 (0.05)
^b \( {\text{g}}^{2} \)	0.13 (0.02)	0.15 (0.02)	0.16 (0.02)	0.27 (0.02)
^c \( {\text{k}}^{2} \)	0.10 (0.02)	0.10 (0.01)	0.08 (0.01)	0.10 (0.01)
^d \( {\text{m}}^{2} \)	0.02 (0.01)	–	0.02 (0.01)	–
^e \( {\text{GCV}} \)	0.14	0.05	0.06	0.06

Standard errors are indicated between brackets
^aAdditive genetic variance was calculated as four times the sire-dam variance
^bGroup effect, calculated as \({\text{g}}^{2} = \upsigma _{\text{g}}^{2} /\upsigma _{\text{P}}^{2}\)
^cKin effect, calculated as \({\text{k}}^{2} = \upsigma _{\text{k}}^{2} /\upsigma _{\text{P}}^{2}\)
^dSocial maternal effect, calculated as \({\text{m}}^{2} = \upsigma_{\text{m}}^{2} /\upsigma _{\text{P}}^{2}\)
^eGenetic coefficient of variation