Table 7.

Estimated timelines for fetal brain developments in the different species

Species	Gestation period (days)	Formation of thalamocortical projections (Mellor and Diesch, 2006)		Onset of somatosensory evoked potentials (SEPs) (Cook et al., 1987)		Onset of cyclical ECoG activity (Szeto and Hinman, 1985; Szeto, 1990)
		Days	Proportion of gestation	Days	Proportion of gestation	Days	Proportion of gestation
Cattle	280–291	> 140	0.5	244	0.85	224	0.8
Sheep	144–150	> 72	0.5	125	0.85	> 115	0.8
Goat	148–156	> 74	0.5	129	0.85	118	0.8
Horse	330–345	> 165	0.5	287	0.85	264	0.8
Pig	112–120	> 56	0.5	n.a.	n.a.	n.a.	n.a.