Quantifying the genetic parameters of feed efficiency in juvenile Nile tilapia Oreochromis niloticus

BMC Genomic Data

Table 3 Expected responses (expressed in unit of the trait improved) to direct selection (diagonal, in grey) or to indirect selection on body weight and growth variation (BWi, BWf, TGC_LOSS, TGC_COMP, BWG, TGC_FI)¹ and on feed intake and efficiency (FI, FCR, RFI)² if one trait is used in the selective breeding program

Traits²	Selection objective
	Growth traits and feed intake							Feed efficiency traits
	BWi	BWf	TGC_LOSS	TGC_COMP	BWG	TGC_FI	FI	FCR	RFI
Selection criterion¹
BWi	7.21	9.81	4.22e-04	.	2.21	6.67e-3	1.99	0.02	0.02
BWf	6.70	9.34	4.49e-05	.	2.27	8.93e-3	1.88	0.02	0.12
TGC_LOSS	0.34	0.06	4.19e-03	3.46e-03	0.27	5.44e-3	0.70	0.10	0.82
TGC_COMP	.	.	6.12e-04	2.25e-02	1.04	8.41e-3	0.81	0.02	0.22
BWG	3.89	5.83	8.10e-04	1.74e-02	1.63	9.49e-3	1.02	−0.01	−0.18
TGC_FI	0.92	1.81	3.28e-03	2.87e-02	0.75	7.79e-3	0.25	−0.02	−0.23
FI	4.40	6.08	2.60e-03	1.72e-02	1.28	3.95e-3	2.05	0.13	1.00
FCR	0.53	0.51	3.92e-03	4.87e-03	−0.12	−4.02e-3	1.19	0.15	1.34
RFI	0.06	0.55	4.27e-03	6.39e-03	−0.31	−5.09e-3	1.4	0.18	1.71

Bolds indicate high (> 75%) expected responses, respectively
¹As an example, select for FCR would improve FCR by 0.15 g.g^− 1 at each generation of selection, but would reduce BWG by 0.12 g, whereas select for BWG would increase BWG by 1.63 g but will not improve FCR, as the expected response to selection is − 0.01 g.g^− 1
²BWi and BWf: BW in g at the beginning and at the end of the FI period, respectively; TGCLOSS Loss of weight during the fasting period estimated as thermal growth coefficient during the fasting period, TGCCOMP Gain of weight during the feeding period estimated as the thermal growth coefficient during the refeeding period, BWG Body weight gain in g during the FI period, TGC_FI Thermal growth coefficient during the FI period, FI Feed intake in g, FCR Feed conversion ratio in g.g^− 1, RFI Residual feed intake in g

ISSN: 2730-6844