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Journal of Dairy Science Vol. 53 No. 2 215-220
© 1970 by American Dairy Science Association ®
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Consumption of Corn Silage Dry Matter by Bred Heifers and Its Correlation with Subsequent First-Lactation Production1,2,

G. W. Brandt, C. C. Brannon, W. E. Johnston3 and W. C. Cook4

Department of Dairy Science, Clemson University, Clemson, South Carolina 29631

ABSTRACT

Twenty Brown Swiss, 28 Holstein, 25 first-generation, and 14 second- and third-generation crossbred heifers were fed all the corn silage they would consume during a 28-day experimental period. The silage was supplemented with 0.65 or 0.68 kg of soybean oilmeal per day and salt free-choice. Regression coefficients between the log of average weight, and logs of average daily intake of silage and dry matter for the 28-day period were 0.49 (P < 0.001) and 0.34 (P < 0.05), respectively. The model used to analyze the data included breed group, W0-49, per cent dry matter, days pregnant, and season. All except season significantly affected (P < 0.01) silage and dry matter intake. Least-squares means of daily intake of silage and dry matter adjusted for all significant factors were used to compare breed groups. Both groups of crossbreds consumed more silage and dry matter than the Brown Swiss or Holsteins. The second- and third-generation crossbreds showed significant heterosis for the consumption of silage.

Correlations between adjusted dry matter intake for the 28-day period and milk and milk constituents produced in the first lactation were inconsistent from one breed group to another, and none of them was significant.

FOOTNOTES

1 Technical Contribution no. 798, South Carolina Agricultural Experiment Station, Clemson University, Clemson, S.C. Published by permission of the Director.

2 This study is part of the Southern Eegional Dairy Cattle Breeding Project, S-49 (Genetic Methods of Improving Dairy Cattle for the South).

3 Assistant Professor, Experimental Statistics.

4 Present address: Orangeburg-Calhoun Tee, Orangeburg, South Carolina 29115.






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Copyright © 1970 by the American Dairy Science Association ®.