TABLE 1.

Effect of genetic selection of growth in meat-type chickens (Zuidhof et al., 2014).

Average daily gain g d–1	Chickens
Between days	Control#	2005 commercial meat-type
1–7	4.6 ± 0.15a	15.9 ± 0.15b
22–28	15.3 ± 0.65a	81.9 ± 0.65b
36–42	20.6 ± 1.04a	99.6 ± 1.04b
50–56	23.0 ± 1.65a	101.1 ± 1.65b

^a,bDifferent superscript letters indicate difference from control p < 0.05. ^#Random bred – not subject to scientific selection.