Safety and Aftercare Following Pregnancy Termination in Queen Cats

Pregnancy termination in queen cats requires more than selecting an appropriate abortifacient. Once treatment has been administered, the queen should be monitored for adverse effects, pregnancy resolution, and general recovery. Therapeutic agents used for mismating can produce systemic effects, and prolonged hormonal treatment may contribute to stress and immunosuppression. Careful follow-up and appropriate supportive management are therefore important components of clinical care. 

Monitor for Treatment-Related Adverse Effects¹ 

Prostaglandin-based treatment requires particular caution because PGF2α can affect multiple body systems. Reported effects include hypersalivation, bradycardia, reflex defecation, urination, and emesis. With cloprostenol, panting and mydriasis may occur within minutes of administration and generally subside within 1–3 hours. 

Atropine sulphate administered before cloprostenol can help prevent these effects. The provided treatment approach also describes premedication approximately 15 minutes before prostaglandin analogue administration with atropine sulphate, prifinium bromide, or metopimazine to reduce adverse effects. 

Estrogen requires particular caution when used for early pregnancy termination. Potential adverse effects include bone marrow suppression, aplastic anaemia, leukopenia, and estrus behaviour. Blind use of estrogen should be avoided because of the reported possibility of blindness in queen cats. 

Assess Whether Pregnancy Termination Is Complete 

Clinical follow-up should take into account the stage of pregnancy and the intended outcome of treatment. When termination is induced later in pregnancy and fetal expulsion is expected, the number of fetuses identified after treatment should be compared with the number previously observed on ultrasonography. This helps assess whether abortion is complete. 

For protocols involving prostaglandin and antiprolactin therapy, complete fetal reabsorption may occur within 6–8 days². Follow-up should therefore be planned according to the treatment approach and expected reproductive outcome rather than assuming that treatment has been completed immediately after drug administration. 

Supportive Care After Hormonal Therapy¹ 

A mismated queen receiving hormonal therapy may develop decreased appetite and depression. Prolonged therapy can contribute to immunosuppression and stress, potentially increasing susceptibility to secondary infections. Supportive and anti-stress therapy can therefore be incorporated when clinically indicated. 

Supportive measures described in the provided content include: 

• Adequate feed and water 

• Maintenance of hygiene 

• Veterinary monitoring and advice 

• Broad-spectrum antibiotics to prevent secondary bacterial infection 

• NSAIDs for pain relief and anti-inflammatory effects 

• Multivitamins to support energy levels and immunity 

• Antacids to relieve acidity 

• Vitamin C to help reduce stress and increase feed intake 

These measures should be selected according to the queen’s clinical condition rather than applied indiscriminately. 

Owner Instructions After Mismating¹ 

Owner education is an important part of aftercare and future prevention. Owners should ensure that queens are not allowed to roam freely during estrus. Early recognition of estrus can also help reduce the risk of another unintended mating. 

Owners should watch for: 

• Vulvar swelling and sero-sanguinous vulvar discharge 

• Increased proximity toward males and increased vocalization 

• Excessive grooming 

• Lordosis behaviour 

If the owner does not intend to breed the queen, ovario-hysterectomy can provide a permanent solution for preventing estrus and subsequent mismating. 

When Mating is Uncertain¹ 

If mating has not been confirmed, vaginal smear examination can be considered to assess the presence or absence of spermatozoa. Rather than immediately administering therapeutic agents, the owner may be advised to wait until pregnancy is confirmed when clinically appropriate. This can help avoid unnecessary treatment, costs, and potential adverse effects. 

Practical Clinical Takeaway 

After pregnancy termination, the veterinarian should focus on adverse-effect monitoring, confirmation of pregnancy resolution, supportive care, and prevention of future mismating. The queen should receive adequate nutrition, water, hygiene, and appropriate clinical support, while owners should be given clear instructions regarding monitoring and reproductive management. Careful follow-up is particularly important when hormonal therapy has been prolonged or when treatment-related adverse effects develop. 

References 

1. Sunil P, Singh K, Biswas N, Kumar S, Dwivedi P, Srivastava N, Khan MH. Medical Termination of Pregnancy in Queen. Animal Reproduction Update. 2024 Jul 1;4(2):19. https://www.researchgate.net/profile/Sunil-Parmar-7/publication/384226126 

2. Rajalakshmi R, Arunmozhi N, Monica G, Umamageswari J, Sarath T, Reena D, Kumar RS, Sridevi P, Krishnakumar K. Combination of anti-prolactin and luteolytic drugs for medical termination of mid-term pregnancy in queen cats. https://www.luvas.edu.in/haryana-veterinarian/download/harvet2022-march/9.pdf