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Effect of Heavy Concentrate Feeding Before Calving Upon Lactation and Mammary Gland Edema¹

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Heavy grain-feeding before calving resulted in no increase in the yield of fat-corrected milk during the first 84 days of lactation. Nine cows and nine heifers received, in addition to a basal roughage ration, a supplement of 378 and 273 lb. grain, respectively, during a 6-wk. prepartum period. A similar number of controls received no grain. During lactation all animals were fed roughage and grain according to maintenance and production requirements. Supplemented animals made significantly greater (P = < 0.01) increases in live weight but evidenced no significant increase in the incidence or severity of mammary edema as determined by visual ratings and linear measurements. Heifers showed more edema at calving than did older cows.

¹ Data presented in this paper are taken from a thesis submitted by J. F. D. Greenhalgh in partial fulfillment of the requirements for the M.S. degree.

² Present address: The Rowett Research Institute, Bucksburn, Aberdeenshire, Scotland.

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