In addition, homozygous deletion cows had the latest (P < 0.05) Julian calving date.
After cows were returned to forage-based diets, no differences (P>0.25) were detected among treatments in BW, BCS, calving date, or calf performance.
Cows were assigned at random within calving date to the four treatments: CS (n=10), PDS (n=10), CS-B (n=9) and PDS-B (n=10).
Twelve multiparous cows (2 13 d postpartum) were blocked by calving date and assigned randomly to treatment sequence in a crossover design experiment.
Holstein cows (n = 25) were assigned in 2 cohorts based on calving date to a 12-wk randomized complete block design study.
Cows between 3 and 40 d postpartum at the start of the experiment were blocked by calving date and randomly assigned to treatment.
Within parity and expected calving date, cows were assigned randomly to 1 of 4 treatments with a 2 × 2 factorial arrangement.
Forty-eight prepartal Holstein cows were blocked by parity and predicted calving date and deployed across pasture (PAS; n = 23) or confinement (CONF; n = 25) systems.
Cows with deletion haplotypes had a lesser (P < 0.05) calving percentage, and the latest (P < 0.05) Julian calving date when compared with cows having other SNP haplotypes.
Forty-eight peripartal Holstein cows were blocked by parity and predicted calving date and assigned to either a pasture (n = 23) or confinement (n = 25) system.
For instance, records with culling date earlier than calving date were excluded.
