2.3. Calculations and statistical procedures
Dry matter intake was calculated as an average over
4 days (i.e. 2 days prior to the day of yield control). Change
in BW was calculated as the difference between BW in
week 12 and after calving (early lactation) and between
week 24 and 12 (late lactation). Yield of ECM was calculated according to the formula described by Sjaunja et al.
(1991) (Eq. (1)).