Table 1. Weight gain by steers drinking poor versus good quality water (kg/day).

Water source	Crawford et al.	Willms et al.	Lardner et al.
	(1997, Table 2)	(2002, Table 3)	(2005, Table 2)
Cattle have direct access to a dam	0.46	0.64	0.97
Water pumped into trough from fenced dam		0.66	1.00
Well, spring or river water in trough	0.46	0.79
Untreated dam water aerated continuously, pumped into trough			1.06
Untreated dam water coagulated & chlorinated, pumped into trough			1.05