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The Effects of Varied Rates of Hay Feeding on Body Weight and Production of Lactating Dairy Cows¹

Iowa Agricultural Experiment Station, Ames

ABSTRACT

Many levels of roughage feeding have been reported. Mead and Goss (10) reported that cows fed concentrates alone were more subject to bloat than animals fed hay plus concentrates, but otherwise the well-being of the animals was not affected. At the other extreme, Sherwood and Dean (15) observed that animals fed hay alone did not suffer harmful effects but produced less milk than cows given a supplement of grain. Smith et al. (16) observed that cows fed hay alone did not produce as much milk as would be expected from the TDN (total digestible nutrient) evaluation of the ration. In a review, Huffman (4) stated that the quality and productive energy content of hays are highly variable and that hay does not always yield production results comparable to TDN content. Huffman and Duncan (5, 6, 7, 8) and Huffman et al. (9) presented data indicating that various concentrate feeds, when substituted on an equal TDN basis for part of the hay in the ration of a lactating cow previously fed alfalfa hay alone, caused increased milk production.

¹ Journal Paper No. J-2534 of the Iowa Agricultural Experiment Station, Ames. Project No. 1124.

² Present address: Dairy Industry Department, Utah State Agricultural College, Logan.