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Design and Conduct of Calf Nutrition Studies. 1. One- Vs. Two- and Three-Day Growth Measurements¹

Animal Industries Department, Storrs Agricultural Experiment Station and Statistics Department, University of Connecticut, Storrs

H. L. Lucas, Jr.

Experimental Statistics Department, North Carolina State College, Raleigh

ABSTRACT

Effects of 1-, 2-, and 3-day measurements for weight, heart girth, girth at paunch, height at withers, and length from withers to pin bones for 48 calves, raised on a limited whole milk-calf starter system, were studied at biweekly intervals for 13 weeks. Because the components of variance approach for studying different numbers of measurement was found to be questionable, measurements taken on successive days on the same calf can not be safely assumed to be independent; conclusions were drawn from the errors estimated by using the 1-day measurements or the average of 1 and 2 or the average of 3 and making comparisons among these errors by the Pitman-Morgan test for correlated mean squares. A single-day measurement was sufficient to determine growth in weight, heart girth, and girth at paunch; whereas, 3-day measurements were significantly better than 1- or 2-day measurements for length from withers to pin bones, but the results were inconclusive for height at withers.

¹ This project was supported in part by funds provided by the Charles M. Cox Company, Boston, Mass., and the Big-Y-Foundation, Norwich, Conn. The data were taken in part from a thesis presented to the Graduate School of the University of Connecticut by Cecilia M. Dembiezak, in partial fulfillment of the requirements for the Master of Science degree. A preliminary report of this work was presented at the 1954 Annual Meeting of the Eastern Division, American Dairy Science Association, West Springfield, Mass. One of the authors, H. D. Eaton, wishes to acknowledge partial financial assistance from North Carolina State College for a portion of this work done during his sabbatical stay at that institution.

² Present address: Statistics Dept., Yale University, New Haven, Conn.

³ Present address: Gillette Safety Razor Blade Co., Boston, Mass.