Cat Pregnancy Due Date Calculator

Feline Reproductive Theriogenology, Induced Ovulation, and Gestational Physiology

Feline reproduction operates under unique theriogenological mechanisms. Domestic cats (queens) are seasonally polyestrous, induced ovulators. Unlike canines that ovulate spontaneously on a fixed hormonal schedule, a queen only releases ova from her ovaries in direct physiological response to the neuro-endocrine stimulation of mating (specifically the tactile stimulation of the tomcat's penile spines on the vaginal wall triggering an immediate LH hormone surge).

Under clinical theriogenology protocols established by the Society for Theriogenology and the Cornell Feline Health Center:

Feline Gestation Roadmap (Average: 63 to 65 Days / Range: 58 to 70 Days):
- Days 1–3: Mating-induced LH surge triggers ovulation of oocytes
- Days 14–16: Blastocysts implant into the zonary placental lining of uterine horns
- Days 20–25: 'Pinking Up' milestone (Nipples turn bright pink, enlarge, and hair recedes)
- Days 25–30: Ultrasound diagnostic confirmation of gestational sacs and fetal heartbeats
- Days 45–50: Fetal skeletal mineralization begins; transition queen to high-calorie kitten food
- Days 55+: Lateral abdominal X-ray (radiograph) to count exact fetal skulls and spines

Pre-Parturition (Kittening) Warning Signs

As parturition approaches at Day 61 to 65:

1. Nesting & Vocalization: The queen seeks out quiet, darkened closets, purring loudly and scratching nesting towels.
2. Temperature Drop: Unlike dogs whose temperature reliably drops, a cat's temperature drop is variable ($<99.0^circ ext{F}$ occurs in only 60% of queens 12–24 hours before labor).
3. Active Labor Triage: Strong active abdominal straining should produce a kitten within 30 to 45 minutes. If active contractions persist for > 60 minutes with no kitten delivered, seek immediate emergency veterinary intervention for dystocia.

Track neonatal milestones with Kitten Growth Calculator, calculate litter box scaling via Cat Litter Box Count Calculator, plan postpartum calories using Cat Food Calculator, and explore feline theriogenology at Cornell Feline Health.