A note on correction factors for lamb birth and weaning weights from sheep recording under field conditions

Abstract

SUMMARYA small scale ewe-recording scheme, involving a minimum of weighing, is described. Results for two years and two breeds have been analysed to produce correction factors in each year for birth type, sex and age of dam in respect of birth weights and weights at 84 days of age derived with and without reference to birth weight. The results suggest that breed differences in correction factors may exist and that differences between years in correction factors may be of minor importance. In standardizing weaning weights to a constant age the influence of birth weight appeared to be relatively unimportant.