The Absorption of Copper and Zinc Table 5

The Absorption of Copper and Zinc by Cattle Consuming Diets
Containing the Antagonists Molybdenum, Sulfur, and Iron

Table 5. Rate and efficiency of gain of replacement heifers fed Cu and Zn alone or in combination using complexed-Cu, complexed-Zn or Cu and Zn sulfate.

	No Added Zinc		Zinc Addition		Main Effects (Prob. Level)
Item	No Cu	Add Cu	No Cu	Add Cu	Inorganic	Cu	Zn	CuxZn	4 vs 5^a
No. Heifers	6	6	6	6	6
Initial wt., lbs	579	592	606	592	593
DM Intake, lbs	15.2	14.7	14.9	14.7	14.8	.15	.52	.31	.72
Daily Gain, lbs	.71	.94	.94	1.00	.99	.19	.19	.39	.93
Feed:Gain	21.4	15.6	15.9	14.7	14.9	.23	.16	.30	.93

^a Availa-Cu + Availa-Zn vs Inorganic Cu and Zn-Sulfate