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Journal of Dairy Science Vol. 52 No. 12 1961-1972
© 1969 by American Dairy Science Association ®
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Input-Output Relationships of Cows Fed Two Types of Roughage and Two Levels of Concentrate During Complete Lactations1

F. R. Murdock and A. S. Hodgson

Department of Animal Sciences, Washington State University, Western Washington Research and Extension Center, Puyallup 98371

ABSTRACT

Total feed input, milk output, and body weight changes were determined on 24 cows fed either alfalfa hay or high-moisture grass silage plus hay in conjunction with concentrates at two levels during full lactation studies. Input-output data were summarized for a prepartum period, ten 28-day and one 25-day lactation periods, and a postpartum period. Although mean forage dry matter intake of hay-fed cows exceeded that of cows fed silage plus hay, cows fed the mixed forage maintained milk production equal to those fed hay and maintained slightly higher body weights during lactation.

Although mean fat-corrected milk production was slightly higher by cows fed concentrate at the challenge level than those fed at the ratio of one to four, differences in milk production for levels of concentrate were not significant (P = >0.10). Milk fat tests were significantly higher (P = <0.05) for cows fed silage and hay than for those fed hay as the sole roughage.

The estimated mean total digestive nutrient consumptions on all rations were in close agreement with those requirements prescribed by the National Research Council when requirements were adjusted for body weight changes.

FOOTNOTES

1 Scientific Paper no. 3260. College of Agriculture, Washington State University, Pullman, Project 1366.






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Copyright © 1969 by the American Dairy Science Association ®.