NAVLE Reproductive

Camelidae and Cervidae Abortion Study Guide

March 28, 2026 25 min read 31 views
Abortion in camelids (llamas and alpacas) and cervids (deer, elk, moose) represents a significant cause of reproductive loss and economic impact.

Overview and Clinical Importance

Abortion in camelids (llamas and alpacas) and cervids (deer, elk, moose) represents a significant cause of reproductive loss and economic impact. These species have unique reproductive physiology that influences the etiology, diagnosis, and management of pregnancy loss. Camelids feature induced ovulation and epitheliochorial diffuse placentation, while cervids are susceptible to specific viral hemorrhagic diseases uncommon in domestic livestock. Understanding these species-specific factors is essential for NAVLE success.

Parameter Alpaca Llama
Gestation Length 335-345 days 340-350 days
Cria Birth Weight 5.5-8 kg 11-16 kg
Pregnancy Location Left horn (greater than 95%) Left horn (greater than 95%)
Placental Passage Within 4-6 hours Within 4-6 hours
Annual Fertility Rate ~50% ~46%
Pathogen Clinical Features Diagnosis/Treatment
Leptospira spp. Major cause in SAC; late-term abortion; serovars Hardjo, Pomona, Icterohaemorrhagiae MAT serology, PCR fetal tissues; Vaccination 2x yearly; Penicillin/Oxytetracycline
Chlamydophila abortus Major cause; weak crias; associated with ovarian hydrobursitis in camels ELISA, PCR, culture; Oxytetracycline; Sheep vaccines used off-label
Brucella abortus/melitensis Common in some regions; zoonotic; late-term abortion Serology (card test), culture; Reportable disease; Test and cull
Listeria monocytogenes Sporadic; late gestation; autolyzed fetus common Culture placenta/fetus; High-dose penicillin; Silage management
E. coli, Streptococcus equi zooepidemicus Ascending placentitis; non-specific infections Culture; Broad-spectrum antibiotics based on C/S
Campylobacter fetus fetus Sporadic abortion; mid-to-late gestation Darkfield microscopy, culture; Erythromycin

PART I: Abortion in Camelidae (Llamas and Alpacas)

Unique Reproductive Features

South American camelids (SAC) have several unique reproductive characteristics that influence pregnancy and abortion. Unlike most domestic species, camelids are induced ovulators - ovulation occurs approximately 24-30 hours after mating, triggered by an ovulation-inducing factor (OIF/beta-NGF) in semen. The placentation is epitheliochorial, microcotyledonary diffuse (similar to equine), with the allantochorion adhering to the amniotic sac.

Key Reproductive Parameters

High-YieldGreater than 95% of camelid pregnancies occur in the LEFT uterine horn regardless of which ovary ovulates. This unique laterality is critical for ultrasound examination and understanding placental development.

Infectious Causes of Abortion in Camelids

Abortion rates due to infectious diseases in camelids range from 10% to greater than 70% in some regions. The diagnosis rate for camelid abortions rarely exceeds 30% of submissions due to autolysis, insufficient samples, and limited expertise in camelid pathology.

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