Selection for feed efficiency using the social effects animal model in growing Duroc pigs: evaluation by simulation

Table 2 Economic weights assigned in the selection index to average daily gain (ADG) and backfat thickness (BF)

	Five scenarios AM^a	25 scenarios SAM^b
	\( \varvec{W}_{{\varvec{ADG}}} - \varvec{W}_{{\varvec{BF}}} \) (%)	\( \varvec{W}_{{\varvec{ADG}}} - \varvec{W}_{{\varvec{BF}}} \) (%)	\( \varvec{W}_{{\varvec{DGE}}} - \varvec{W}_{{\varvec{IGE}}} \) (%)
Economic values	0–100	0–100	0–100
	25–75	25–75	25–75
	50–50	50–50	50–50
	75–25	75–25	75–25
	100–0	100–0	100–0

^aThe five scenarios with the classic animal model. Index for AM: \( \widehat{{I_{j} }} = W_{ADG} *\widehat{{ADG_{j} }} - W_{BF} *\widehat{{BF_{j} }} \)
^bThe 25 scenarios with the animal model including direct (DGE) and indirect (IGE) genetic effects are obtained by combining each element of the column \( W_{DGE} - W_{IGE} \) (%)—weights on the DGE or the IGE—with the weights in the column to its left. Index for SAM: \( \widehat{{I_{j} }} = W_{ADG} *\left( {W_{DGE} *\widehat{{ADG_{DGEj} }} + W_{IGE} *7 *\widehat{{ADG_{IGEj} }}} \right) - W_{BF} *\left( {W_{DGE} *\widehat{{BF_{DGEj} }} + W_{IGE} *7 *\widehat{{BF_{IGEj} }}} \right) \)

ISSN: 1297-9686