This will help them to get in-calf quickly, calve early, and get back in-calf early as a first calver. Research shows they generally outperform under-target herd-mates in:
- milk production in their first two lactations
- reproductive performance.
First calvers take approximately 10 days longer than cows to recover from calving and start cycling again, so it’s common to mate them ahead of the herd at 15 months old. Because of this, calving pattern targets vary depending on how far ahead of the main herd they were mated.
- Same mating start date – 75% calved by three weeks and 92% by six weeks.
- One week ahead – 82% and 96%.
- Two weeks ahead – 87% and 98%.
- Three weeks ahead – 92% and 99%.
The other key target for first calvers is the 90% three week submission rate.
Failure to reach the calving pattern or submission rate targets could be a reflection of:
- liveweight at 15 and 22 months old
- bull power or bull management
- body condition score at calving (target is 5.5)
- calving pattern
- management once in the herd.
MINDA and Fertility Focus report
Use MINDA Weights to see if your heifers hit liveweight targets at 15 and 22 months.
See how they calved on the Fertility Focus report or the Calving Rate by Age report on MINDA LIVE.
MINDA LIVE also provides by Age Group
graphs for submission, conception and in-calf rates for first calvers (two-year-olds).