Repeatability of Heat Tolerance Observations

Dairy husbandman and assistant in dairy husbandry, respectively.Acknowledg.ment is made to Cecil Branten, assistant dairy husbandman, for suggested changes made in the final manuscript.2 The computations (8) of repeatability of single records of the same cow and heritability of single records of cows involved the segregation of specific sources of variance and use of the principles involved in intra-class correlations.The first is a measure of how well records of the same cow repeat themselves on various test periods and the second is a measure of what portion of the variance between single records of different cows is hereditary.957