Table 7.
Summary of reproductive management for Canadian cow-calf herds reported in submitted annual herd calving records (n = 565) and breeding to weaning records (n = 543) for the C3SN between 2019 and 2022.
| Western Canada | Eastern Canada | |||
|---|---|---|---|---|
| % herds breeding heifers ≥2 weeks earlier than cows* | % of annual herd reports 12% (42/364) |
% not reported 5% (20/364) |
% of annual herd reports 10% (18/179) | % not reported 10% (18/179) |
| Breeding season ≤ 63 days | cows: 32% (118/364) | heifers: 40% (144/364) | cows: 12% (22/179) | heifers: 15% (27/179) |
Artificial insemination / embryo transfer
|
% of herds reporting any30% (34/112)35% (39/112) | % of females in herds using any: mean (SD***)28% (24%)66% (32%) | % of herds reporting any59% (35/59)58% (34/59) | % of females in herds using any: mean (SD)44% (30%)75% (29%) |
| % pregnancy tested all females | 85% (309/364) | 78% (140/179) | ||
| % pregnancy tested some females | 11% (40/364) | 19% (34/179) | ||
Length of calving season **
|
days: median (5th and 95th percentile)93 (65, 157)74 (47, 130) | % not reported2% (9/379)7% (26/379) | days: median (5th and 95th percentile)162 (67, 350)90 (34, 251) | % not reported2% (3/186)13% (24/186) |
| % herds heifer calving season ≥2 weeks earlier than cows |
% of annual herd reports 15% (56/379) |
% not reported 6% (22/379) |
% of annual herd reports 9% (16/186) |
% not reported 12% (22/186) |
*Start of heifer breeding season less date start of cow breeding season.
**Date last full-term calf was born less date when first full-term calf was born to female bred in this herd.
***Standard deviation.