TABLE 4.

Proportion of individual VFAs generated in the ceca of chickens.

	Young meat-type chickensX	Adult female chickensY
Acetic acid/acetate (C2)	76.9	51.6 ± (10) 2.8
Propionic acid/propionate (C3)	5.9	26.7 ± (10) 1.9
Butyric acid/butyrate (C4)	17.5	9.2 ± (10) 0.8
Isobutyric acid/isobutyrate (C4)	ND	1.3 ± (10) 0.4
Isovaleric acid (C5)/2 methyl butyric acid	ND	1.8 ± (10) 0.5
Valeric acid/valerate (C5)	ND	2.0 ± (10) 0.4

^XKumar et al. (2018). ^YCalculated from data in Annison et al. (1968) for laying hens. ND, not detected.