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Additions of Hay to Corn Silage to Maximize Feed Intake and Milk Production¹

North Carolina Agricultural Experiment Station, Raleigh³

ABSTRACT

Sixty cows were used in a series of feeding trials conducted at three North Carolina experimental farms over two winter-feeding periods to determine the optimum amount of hay to be used to supplement an ad libitum corn silage feeding regime for milk production. The four hay levels consumed were 0.83, 0.47, 0.24, and 0.00 lb. per 100 lb. of live weight. After a 28-day standardizing period, in which cows were offered silage ad libitum and 1 lb. of hay per 100 lb. of live weight, each cow was carried for a 56-day comparison period on one of the four experimental rations.

Dry matter intake was highest in the group which consumed 0.83 lb. of hay per 100 lb. of live weight with the calculated maximum intake being at 0.79 ± 0.37 lb. of hay. Milk, fat, and FCM production was highest for the group consuming the 0.47 lb. level of hay with the calculated maximum for FCM being at 0.52 ± 0.22 lb. of hay. Mean changes in live weight were essentially the same for the four treatment groups.

¹ Published with the approval of the Director of Research as Paper No. 610 in the Journal Series. A preliminary report of this work was presented at the 49th Ann. Meet. of A.D.S.A. (See J. Dairy Sci., 37: 657. 1954).

² Present address: Animal Husbandry Department, Iowa State College, Ames.

³ Department of Animal Industry and Institute of Statistics.