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On the accuracy of three measurements of heifers.

Published online by Cambridge University Press:  27 March 2009

H. G. Sanders
H. G. Sanders
Affiliation:
Institute of Animal Nutrition, School of Agriculture, Cambridge.
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Extract

Six heifers have been measured every week, for 5 weeks before calving and 6 weeks after calving, with the object of ascertaining what errors would be introduced by taking one set of measurements during such a period, as representing the size of the heifer at parturition.

The gross standard error was found to be 0·834 cm. in measuring shoulder height and back length and 0·605 cm. in measuring height to the elbow.

During the period these heifers were growing as follows: shoulder height, 0·159 cm. per week; back length, 0·124 cm. per week; and elbow height, 0·079 cm. per week.

When allowance was made for growth the net personal errors of measurement gave standard errors of 0·636 cm., 0·727 cm., 0·547 cm. respectively for shoulder height, back length and elbow height, and the errors were, apparently, distributed normally.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 16 , Issue 4 , October 1926 , pp. 607 - 615
Copyright
Copyright © Cambridge University Press 1926

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