The value of milk for young animals is well known to Iowa farmers; its value as part of a feeding ration for all animals has not been so well determined. Dairying is increasing so fast in the state, that this Station thought it wise to ascertain the value of milk, as a ration, or part of a ration, for cows giving milk. During the interval between college terms in 1891, we had surplus full milk, and skimmed milk, that we resolved to feed to cows on pasture to ascertain its effect on milk-giving.
We took two Holstein cows to experiment with, Nos. 155 and 151. The former had been giving milk fora month, the latter was fresh.