Submitted to: Journal Dairy Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: 7/17/1996
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: Fifty-three dairy cows were used to determine the effect of additional fat supplied by high oil corn compared with normal corn on dairy cow performance. Cows were randomly assigned before calving to normal corn (NC) and high oil corn (HOC) treatments. Starting wk 3 and lasting through wk 24 of lactation, cows in the NC treatment were fed diets containing normal corn silage and normal high moisture ear corn (HMEC) whereas cows in the HOC treatment received high oil corn silage and high oil HMEC. Diets contained (DM basis): alfalfa silage 27.5%, corn silage 22.5%, HMEC 31.5%, soybean meal 10%, roasted soybeans 4.6%, and blood meal 2%. Diets were fed as a TMR once daily. Normal and high oil corn silage contained: DM, 36.6 and 36.8%; CP, 7.2 and 7.9%; NDF, 42.4 and 40.4%. Normal and high oil HMEC contained: DM, 69 and 75%; CP, 8.8 and 8.9%; NDF, 13.3 and 13.8%. Total fatty acids (sum of C14:0 to C:18:3) in NC and HOC treatment diets were 3.43 and 4.38%. All analyses are on a DM basis. Results are summarized below: Item NC HOC SEM P= DM intake, kg/d 21.7 21.6 .4 .6 Milk yield, kg/d 36.5 36.0 .8 .7 3.5% FCM, kg/d 35.4 34.8 .7 .6 Milk fat, % 3.39 3.28 .05 .14 Milk protein, % 3.00 2.93 .03 .1 BW gain, kg (BW at wk 23 - wk 2) 29.7 28.0 The high oil corn hybrids used in this study to supply both corn grain and corn silage did not improve lactation performance of dairy cows.