There were 16 replicates (i.e.,weeks) for Dairy 1 and 15 replicates for Dairy 2. Only first
service, lactating Holstein cows in an Ovsynch program were used. Cows at Dairy 1 were housed in dry lot pens. Cows at Dairy 2 had dry lot pens and covered free stalls
with clean sand bedding. Cows at both dairies were milked three times per day and fed total mixed rations.