Determinación de los niveles de estrógenos de perras esterilizadas en la clínica docente de especialidades veterinarias UTMACH

Abstract

The present investigation entitled "Determination of estrogen levels in spayed bitches at the UTMACH Veterinary Specialties Teaching Clinic" had as its main objective to evaluate the hormonal alterations associated with ovariohysterectomy (OVH) and its impact on the general health of bitches, with emphasis on the prevention of hormone-dependent pathologies such as mammary tumors. This study focused on the measurement of estrogen levels before and after surgery, using specific serological tests, and on the determination of the state of the estrous cycle prior to surgery by means of vaginal cytology, allowing to correlate the hormonal phases with the levels recorded.The results showed that OVH produces a significant decrease in estrogen levels, bringing most patients to values typical of the anestrus state (<10 pg/ml) 50 days after the procedure. This hormonal change confirms the efficacy of the procedure in interrupting ovarian estrogen production, which significantly reduces the risk of developing mammary tumors, especially when spaying is performed before the second heat. Patients with high estrogen levels before surgery, corresponding to phases such as proestrus and estrus, demonstrated greater hormonal activity, highlighting the importance of planning OVH during anestrus to reduce associated surgical risks, such as intraoperative hemorrhages and inflammatory complications.