DOGS
1st cycle: 7-9 months
Duration: 7-42 days
Next cycle after parturition: 7 months
Gestation: 63 days

CATS
1st cycle: 4-12 months
Duration: 2-19 days
Next cycle after parturition: 7-9 days
Gestation: 63 days

HORSES
1st cycle: 15-24 months
Length of estrus: 4-8 days
Gestation: Approx 340 days
Next cycle: 9 days after foaling

CATTLE
1st cycle: 10-15 months
Length of estrus: 12-18 hours
Gestation: 278-293 days

GOATS
1st cycle: 5-7 months
Length of estrus: 30-40 hours
Gestation: Approx 150 days

SWINE
1st cycle: 5-8 months
Length of estrus: 48-72 hours
Gestation: 114 days