J. Anim Sci.
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J. Anim Sci. 1972. 34:9-13.
© 1972 American Society of Animal Science
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Estimating Milk Yield of Beef Cows 1,2

J. J. Rutledge, O. W. Robison, W. T. Ahlschwede3 and J. E. Legates

North Carolina State University, Raleigh 27607

Abstract

Lactation records (279) from 193 Hereford cows in two North Carolina herds were used to evaluate various sampling schemes for estimating TMY which was defined as the sum of 7 monthly 24-hr, measures. Four prediction equations each based upon three 24-hr, measures were prepared from the North Carolina data. An independent data set provided by workers at the University of Wisconsin was used to test the suitability of these prediction equations. Correlations between observed milk yield in the Wisconsin data (based upon weekly measurements during lactation) and predicted milk yields (based upon three measures and the North Carolina equations) were greater than 0.93. Another independent data set involving three breeds of beef cows was furnished by workers at Texas A&M. Within breed correlations between observed TMY and predicted TMY ranged from 0.94 to 0.99. It appears that the prediction equations are suitable for use over a wide range of environmental and managerial practices.

The estimate of repeatability for TMY was 0.38. This value suggests a low to moderate heritability of milk production in beef cows.

Footnotes

1 Paper No. 3457 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh.

2 Computing services for this investigation were supported by Public Health Service Grant FR—00011.

3 Present address: Animal Science Department, University of Nebraska, Lincoln.






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