About the Breeding Calculator
Understanding Animal Reproduction
Successful breeding requires understanding reproductive cycles, gestation periods, and optimal breeding times. Our calculator helps you plan breeding programs, predict due dates, and manage your breeding calendar effectively.
Gestation Periods Explained
Gestation length varies significantly between species and can be affected by breed, litter size, and environmental factors. Large animals generally have longer gestation periods, while animals that produce multiple offspring often have shorter pregnations.
Heat Cycles and Breeding Windows
- Cattle: 21-day cycles, breed 12-24 hours after standing heat
- Horses: 21-day cycles, breed 24-48 hours before ovulation
- Sheep/Goats: 17-21 day cycles, seasonal breeders in temperate climates
- Pigs: 21-day cycles, breed 12-24 hours after standing heat begins
- Dogs: 6-month cycles, breed days 10-14 of heat
Signs of Heat (Estrus)
Common signs include restlessness, mounting behavior, vulvar swelling, clear discharge, decreased appetite, and increased vocalization. Cattle show standing heat (allowing mounting), while cats display lordosis posture. Keeping accurate records helps predict future cycles.
Pregnancy Detection Methods
Early pregnancy detection improves management efficiency. Methods include ultrasound (earliest), blood tests for pregnancy-specific proteins, rectal palpation in large animals, and observing for return to heat. Each method has different accuracy windows.
Preparation for Birth
Start preparations 30 days before due date: prepare birthing area, stock supplies, adjust nutrition, and arrange veterinary support. The last week requires close monitoring for signs of impending birth like udder development, relaxed ligaments, and nesting behavior.