THE SPERM QUALITY AND FERTILITY OF BOARS AFTER TWO DIFFERENT EJACULATION FREQUENCIES

Ten ejaculates were examined from each one of six healthy boars, Large White breed, at the age of 22 months. Quality assesment was canied out by means of phase contrast light microscopy and scanning electron microscopy to determine the motility, concentration and sperm quality. To study their fertility, 75 multiparous sows were inseminated by each one of six boars at the age of 22 months. From three boars (group 1) semen was collected twice weekly, without rest periods, from the age of 10 months. Another three boars (group 2) were subjected to an ejaculation frequency at 2-day intervals, without rest periods, from the age of 10 months. The differences in boar fertility and sperm quality between the first group and the second group are statiscally significant (pe0.01). In the second group the semen PH, the spermatozoa with proximal droplet and the aberrant spermatozoa increase, and the sperm motility, the sperm concentration, the mature spermatozoa, the spermatozoa with distal droplet and the fertility decrease. The depletion of the sperm reserves of the tai1 of the epididymis and a shortened maturation of the spermatozoa in the epididymis can be the reasons of these changes in the quality sperm. The ejaculation frequencies affect the sperm quality and the b o a fertility. Paraules clau: Freqiikncia d'ejaculació, Fertilitat, Qualitat espermhtica. Palabras clave: Calidad espermática, Fertilidad, Frecuencia de eyaculación