Table 2.

Mammary gland weight and milk volume in Zip3-null and wild-type dams

	Genotype
	Wild-Type	Zip3-null
Mammary gland, g
Early	2.52±0.35	2.24±0.54
Late	2.90±0.77	1.94±0.57*
Milk, μl
Early	85±28	9±12*
Late	34±37	36±65

Data represent means ± SD (n = 6/d).

^*Significant effect of genotype; P < 0.01.