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Dairy · Reproduction · Fertility

100-day in-calf rate

52% in calf by 100 days

In a year-round or split-calving herd — the norm across Queensland — the 100-day in-calf rate is the key timing measure: the share of the herd back in calf within 100 days of calving.

Worked example · Cumulative % in calf by 100 days
Willow Ck 52% Target 65% day 0 day 60 day 100
Cumulative % in calf by 100 days
The benchmark

For year-round and split herds InCalf uses the 100-day in-calf rate: the average is around 50%, with 65%+ achievable in well-managed herds.

Dairy Australia · InCalf ↗
What it signals

It captures both how promptly cows are submitted for mating and how many hold to service. A low rate stretches days in milk, drops production and leaves more empty cows at the 200-day mark.

Data required to calculate
Cows calvedno.Cows in calf by 100 daysno.

Silo pulls each of these from the sources the operation already uses, and keeps the figure current automatically.

How to improve it
01

Set a tight voluntary waiting period and submit cows promptly after calving.

02

Pre-mating heat record so non-cyclers are found and treated early.

03

Manage transition-cow condition so cows cycle early and hold to service.

Questions & answers

What is 100-day in-calf rate?

In a year-round or split-calving herd — the norm across Queensland — the 100-day in-calf rate is the key timing measure: the share of the herd back in calf within 100 days of calving.

What data do you need to calculate 100-day in-calf rate?

You need: Cows calved (no.), Cows in calf by 100 days (no.). Silo pulls each of these from the sources the operation already uses and keeps the figure current automatically.

What is a good 100-day in-calf rate benchmark?

For year-round and split herds InCalf uses the 100-day in-calf rate: the average is around 50%, with 65%+ achievable in well-managed herds.

How do you improve 100-day in-calf rate?

Set a tight voluntary waiting period and submit cows promptly after calving. Pre-mating heat record so non-cyclers are found and treated early. Manage transition-cow condition so cows cycle early and hold to service.

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