Abstract
Milk samples from three Arabian and seven Quarter Horse mares were obtained by manual expression of the contents of one mammary gland into acid-washed Pyrex beakers. The first sample (partum) was obtained 15 to 30 min. after parturition and before first nursing of the the foal. The respective milk concentrations (µg/g) of iron, zinc and copper at the designated sampling periods were as follows: partum 1.31, 6.43 and 0.99; 12 hr. 0.95, 2.83 and 0.83; 24 hr. 1.05, 3.65 and 0.73; 48 hr. 0.86, 3.73 and 0.66; 5 days 0.88, 3.46 and 0.44; 8 days 0.88, 3.29 and 0.44; 3 weeks 0.83, 2.81 and 0.29; 5 weeks 0.71, 2.24 and 0.25; 2 months 0.61, 2.06 and 0.23; 3 months 0.55, 2.15 and 0.25; 4 months 0.49, 2.44 and 0.20. Copyright © 1974. American Society of Animal Science. Copyright 1974 by American Society of Animal Science.