1986 Volume 3 Pages 155-159
Four lactating Holstein cows were housed in the two independently controled climatic rooms. Although Mo concentration in milk decreased at 30°C, There were no significant differences in trace element concentration in milk between treatments. Negative retention of Zn, Se, and Mo at 26°C may be partly due to relatively high secretion in milk at 26°C. Since the ratio of secretion in milk to intake of Zn, Se, and Mo was extremely greater than that of Fe, Cu, Mn, and Co, more attention must be paid to Zn, Se, and Mo nutrition in relation to milk production. Results suggests that the Zn, Se, and Mo metabolism of lactating cows may be affected by heat stress.
