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

Table 6. Percent change in liver copper and zinc after 90 days of supplementation with copper and zinc alone or in combination.

  No Added Zinc Zinc Addition Main Effects (Prob.Level)_
Item

No Cu

Added
Cu

No Cu

Added
Cu

Inor-
ganic

Cu

Zn

CuxZn

4 vs 5*
No. Heifers 6 6 6 6 6        
Initial ppm
Cu

Zn

83

120

74

104

100

128

74

134

85

114

.07

.60

.35

.05

.38

.24

.36

.09
Final, ppm
Cu

Zn

91b

155b

92b

121a

59a

125a

151c

143b

151

128

.01

.34

.36

.63

.001

.004

.98

.29
% Change
Cu

Zn

108b

129

124c

116

59a

98

203d

107

177

112

.001

.79

.61

.01

.0008

.12

.41

.78

* Availa-Cu + Availa-Zn vs Inorganic Cu and Zn-Sulfate
a, b, c, d Means within the same row without a common superscript are different (P<0.05)