Effects of previous calving interval on level of
production in the current lactation were accounted
for using additive correction factors derived by Sadek
and Freeman 1992.. Effects of days open in the
current lactation on production were ignored to avoid
confounding with shape of the lactation curve. A
fixed dry period of 2 months was used. Effects of
lactation number on 305-day milk yield and effects
of lactation number and stage of lactation on fat and
protein content of milk were as in Dekkers