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Objetivou-se avaliar os efeitos da adição de concentrados de proteínas do plasma seminal (PPS) no diluente de congelamento sobre a congelabilidade do sêmen eqüino. Foram avaliados três tratamentos: um controle, no qual o sêmen foi congelado no diluente Botu-Crio®; e outros dois, com adição de 10% ou 20% (v/v) de proteínas do plasma seminal ao diluente. As maiores médias de motilidades total e progressiva foram observadas no tratamento controle, que foram superiores às obtidas com adição de 20% de proteínas, mas não diferiram das obtidas com adição de 10% de PPS. Os resultados do teste hiposmótico e do número de espermatozóides vivos obtidos com o congelamento do sêmen no diluente (controle) foram superiores aos encontrados com a adição de 10% de PPS, que, por sua vez, foram melhores que os observados com a adição de 20% de PPS ao diluente. A adição do concentrado de proteínas do plasma seminal não melhora os parâmetros espermáticos do sêmen eqüino. The aim of this study was to evaluate the effect of increasing the concentration of protein of the seminal plasma in the extender used for frozing equine semen. Three treatments were compared: The conventional one, defined by using only the Botu-Crio® extender for frozing semen; and other two defined by adding 10% (v/v) or 20% (v/v) of seminal plasma proteins to Botu-Crio® extender. Averages of total and progressive motility were statistically higher in the conventional treatment than in that defined by adding 20% (v/v) of seminal plasma proteins but they did not differ from those obtained by adding 10% (v/v) of seminal plasma proteins to Botu-Crio® extender. The best results for the hypoosmotic test and the number of live spermatozoa were obtained in the conventional treatment, and results for adding 10% (v/v) of seminal plasma proteins were better than those obtained by adding 20% (v/v) of seminal plasma proteins to Botu-Crio® extender. These results indicate that the addition of concentrated protein of the seminal plasma to the extender did not improve the cryopreservation of equine semen

Efeito de proteínas do plasma seminal eqüino com massa superior a 10 kDa concentradas 10 vezes sobre a congelabilidade do sêmen