AlpacaKeepHow long is alpaca pregnancy?
Alpaca gestation averages 345 days; llama gestation runs slightly longer at 350 days - both roughly 11.5 months. The practical safe-zone is 320 to 375 days for alpacas and 330 to 360 days for llamas. Day 320 is when most experienced breeders begin Cria Watch (the earliest viable birth window); day 375 is when an unborn cria warrants a vet check rather than further waiting. Suri alpacas tend to gestate slightly longer than Huacaya on average. Guanacos average around 347 days; vicuñas around 345 days. Gestation length varies with season: Davis et al. (1997, Theriogenology, PMID 9231268) found that spring-mated alpacas gestated approximately 12.5 days longer than those mated in autumn - a meaningful difference when preparing your birthing kit.
When can you confirm pregnancy?
The classic confirmation method is the spit-off test: re-introduce the male at days 7, 14, and 21 after mating and observe whether the female sits (receptive) or rejects him (spitting, running off). A consistent rejection strongly suggests pregnancy, but spit-off only confirms that ovulation occurred - not that a viable embryo is present. Early embryonic loss affects roughly 10% of apparently pregnant dams between the first positive spit-off and day 60. Transrectal ultrasound in the hands of an experienced reproductive vet can detect the embryonic vesicle from as early as day 23–30. Transabdominal scanning, which is less invasive, becomes reliable from day 45–60. If you need certainty before day 45, book a transrectal scan. By day 90 the pregnancy is considered well-established and the risk of resorption drops sharply. Sources: UK Alpaca Vet reproductive services; Animal Ultrasound Association llama/alpaca pregnancy guidance.
What to prepare and when
Good preparation begins well before the due date. At day 200 - roughly two-thirds through gestation - fetal growth accelerates: increase the quality of hay and concentrates, review selenium, vitamin E, and copper levels, and book a late-trimester vet check for maiden dams. Thirty days before the due date, assemble your birthing kit: sterile iodine for navel dipping, spare colostrum (either frozen from a previous dam or a commercial substitute), clean towels, a heat lamp for cold or wet weather, a thermometer, scales, and your vet's emergency number. Move the dam to the birthing paddock at this point so she can settle before parturition. From two weeks out, check the udder daily - when colostrum is present and the teats wax up (typically 1–4 days before delivery), increase checks to every 2–3 hours. Most crias arrive between 8 am and midday; prolonged straining for more than 30 minutes during stage 2 is an emergency. Sources: BAS Fact Sheet 2 - Mating (British Alpaca Society).
First-time dam vs experienced dam
Maiden females (first-time dams) often show stage-1 labour - restlessness, rolling, frequent getting up and down - for 12–24 hours before active straining begins. An experienced dam may show very little outward sign until she is close to delivery. If you are unsure whether a maiden is in early labour or simply uncomfortable, watch for progressive changes in posture and appetite rather than a single dramatic sign. Do not leave a maiden dam unattended once teats have waxed. Sources: Cotton Creek Farms - Signs of Alpaca Labor and Delivery.
After the cria arrives
The placenta should pass within 4–6 hours of birth - if retained beyond 8 hours, call your vet. Dip the navel in 10% iodine immediately, and ensure the cria stands and nurses within 4 hours; the colostrum absorption window closes at 24 hours. Weigh the cria at birth and again at 24 hours to confirm it is nursing adequately. Have your vet run an IgG (immunoglobulin) test at 24–48 hours if you have any doubts. The dam can typically be re-mated 14–21 days post-partum once the uterus has fully involuted. Sources: Aubrey Oaks Alpacas - postpartum care guide.