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Goat semen is different from that of other domestic species in its limited tolerance to the inclusion of egg yolk in the freezing medium, and this tolerance depends on the presence of enzymes in the seminal plasma that react with egg yolk, producing toxic compounds to the spermatozoa. Moreover, the goat is a seasonal breeder that shows variations in semen quality throughout the year, and those variations may affect semen freezability; hence in freezing protocols, for instance, removal of seminal plasma (washing) yields varying results. This work was designed to study this problem in Canary goats: semen from six males was collected in spring, autumn or winter, washed or non-washed, diluted in a freezing extender with 1.5, 6 or 12% egg yolk, frozen, and thawed after 2 days, 2 or 6 months of cryopreservation. The effect of egg yolk concentration in the freezing extender was far more important than the effect of washing or season on sperm cryosurvival. The quality of frozen-thawed semen tended to improve as egg yolk concentration increased regardless of the effects of season, washing or period of cryopreservation. Washing produced a positive effect on frozen-thawed semen collected during spring or autumn, but the difference decreased as the concentration of yolk increased. However, washing produced a negative effect on frozen-thawed semen collected during winter, diluted with either 6 or 12% egg yolk. There was no apparent seasonal effect on gross measures of sperm production but the seasonal effect was ever present and was reinforced by freezing.

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HIV infection is considered a risk factor for the development of pulmonary arterial hypertension (PAH) and the estimated prevalence of PAH in developed countries is 0.5%. The aim of this study was to determine the prevalence of PAH in a cohort of HIV-infected patients and the related factors. We undertook an observational study of a consecutive cohort of asymptomatic HIV-infected patients. Data were recorded about factors of cardiovascular interest and factors related to HIV infection. All the patients underwent a transthoracic echocardiogram (Vivid S6, GE Healthcare). PAH was considered to be a pulmonary arterial systolic pressure (PASP) >40 mm Hg. The study included 194 patients (85.2% men) with a mean age of 47.0 years, 94% of whom were on antiretroviral therapy (ART). The mean CD4 lymphocyte count was 495/mm(3). The mean duration of HIV infection was 131.5 months, and 28.4% had experienced an AIDS event. PAH was present in five patients (2.6%) and 14 were in the gray zone (PASP of 36-40 mm Hg). These five patients were men, the route of transmission was homosexual, and they were all on ART. They were also older than the patients without PAH (57.7 vs. 46.4 years, p=0.02) and had been on ART for longer (180.0 vs. 92.5 months; p=0.01). No association was found with any of the other parameters. The prevalence of PAH in this cohort of patients was greater than in other published series. The only associations found were with older age and longer ART time.