Data from a foster feeding experiment with rat mothers and litters of
four different genotypes: A
, B
, I
and J
.
Rat litters were separated from their natural mothers at birth and
given to foster mothers to rear.
genotype
The data frame has the following components:
Litter
genotype of the litter.
Mother
genotype of the foster mother.
Wt
Litter average weight gain of the litter, in grams at age 28 days. (The source states that the within-litter variability is negligible.)
Venables, W. N. and Ripley, B. D. (1999) Modern Applied Statistics with S-PLUS. Third Edition. Springer.