butterfat {faraway}

Butterfat content of milk by breed

Description

Average butterfat content (percentages) of milk for random samples of twenty cows (ten two-year old and ten mature (greater than four years old)) from each of five breeds. The data are from Canadian records of pure-bred dairy cattle.

Format

A data frame with 100 observations on the following 3 variables.

Butterfat

butter fat content by percentage

Breed

a factor with levels Ayrshire Canadian Guernsey Holstein-Fresian Jersey

Age

a factor with levels 2year Mature

Source

Sokal, R. R. and Rohlf, F. J. (1994) Biometry. W. H. Freeman, New York, third edition.

Examples

data(butterfat)
## maybe str(butterfat) ; plot(butterfat) ...