Utilização de égua com endometrite como doadora em programa de transferência de embrião

Abstract

In recent decades, Brazil has consolidated its position as a global leader in the use of reproductive biotechnologies in horses. As a result, embryo transfer (ET) protocols continually seek to optimize results, especially in the management of mares with a history of subfertility. Among the main reproductive challenges is endometritis, an inflammation of the endometrium that alters the uterine environment, impairing embryo survival. In chronic cases, it can progress to endometriosis, characterized by fibrotic degenerative changes in the endometrial glands, which severely compromises the reproductive efficiency of the donor. Given this, the present study aimed to report the procedures and reproductive results in a ET program using a Quarter Horse donor with a history of chronic endometritis resulting from severe rectal laceration. Due to recurrent fecal contamination and anatomical sequelae, therapeutic management consisted of uterine lavage with low-concentration hydrogen peroxide (H₂O₂) (10 mL/L), associated with the application of oxytocin before artificial insemination to promote uterine clearance. The strategy proved effective in sanitizing the lumen and removing debris, resulting in a 50% embryo recovery rate. It is concluded that the judicious use of oxidizing agents in reduced doses, combined with mechanical drainage, is a viable alternative for the control of chronic endometritis in mares with anatomical compromise, ensuring reproductive longevity and genetic preservation of the animal.