Calving Season Calculator
Calculate bull turnout dates based on your target calving window. Plan breeding season timing and calving spread.
Inputs
Results
Bull Turnout Month
5
Calving Spread
60 days
How to Use This Calculator
- Enter Target Calving Start Month, January, and February.
- Set March, April, and May.
- Adjust June, July as needed.
- Review Bull Turnout Month and Calving Spread (days).
- Use Bull Turnout Day and Breeding End Month to inform your decision.
How the result changes with Gestation Period
| Gestation Period | Bull Turnout Month | Calving Spread |
|---|---|---|
| 273 | 6 | 60 days |
| 281 | 5 | 60 days |
| 290 | 5 | 60 days |
| 297 | 5 | 60 days |
What each input means
- Target Calving Start Month
- Month you want calving to begin.
- Gestation Period
- Average cattle gestation is 283 days. Varies by breed.
- Breeding Season Length
- Days bulls are with cows. Shorter = tighter calving window.
- Desired Calving Window
- Target number of days for all calves to be born.
What each result means
- Bull Turnout Month
- Month to turn bulls out with cows.
- Bull Turnout Day
- Approximate day of month for turnout.
- Breeding End Month
- Month to pull bulls.
- Last Calving Month
- Expected month of last calves.
- Calving Spread
- Total days in your calving window.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersTarget Calving Start Month = 3, Gestation Period = 283, Breeding Season Length = 60, Desired Calving Window = 60 = 4 input(s) provided
- Calculate Bull Turnout MonthBull Turnout Month = min(125 = 5
- Calculate Calving SpreadCalving Spread60 = 60
- Calculate Bull Turnout DayBull Turnout Day = min(2822 = 22
- Calculate Breeding End MonthBreeding End Month = min(127 = 7
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.
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