Abstract

GOMEZ L, Germán; MESA, Henry; SANCHES-OSORIO, Jonatan  and  HENAO, Francisco Javier. DYNAMICS OF Sus scrofa SEMEN QUALITY IN THE WESTERN-CENTRAL REGION OF COLOMBIA. Bol. Cient. Mus. Hist. Nat. Univ. Caldas [online]. 2015, vol.19, n.2, pp.139-153. ISSN 0123-3068.  https://doi.org/10.17151/bccm.2015.19.2.8.

In order to characterize the dynamics of Sus scrofa (order Artiodactyla, family Suidae) semen quality in the Western-central region of Colombia, information of 1,017 assessments from 177 males from 12 swine farms located between 700 and 2,600 meters above sea level in different inter-tropical systems was collected in the Laboratory of Reproductive Biology at Universidad de Caldas (Colombia) during seven years. The database included the seminal variables: concentration, morphology (head, midpiece and tail), membrane structural integrity (MSI), acrosome integrity (ACRI), and membrane functional integrity (MFI) proximal citoplasmic droplets (PCD), distal citoplasmic droplets (DCD), and total citoplasmic droplets (TCD). Additionally, the racial group of the male (grac): maternal cross (cm), paternal cross (cp), paternal pure (pp), maternal pure (pm) and age group (agegr): young (up to 18 months), mature (19 to 36 months) and old (over 37 months) were registered. Data was explored by estimating descriptive statistics; it was analyzed using a log-linear model consisting of a Poisson regression with a log link function using the PROC GENMOD of SAS (SAS Inst. Cary, NC). The effect of age group and racial group on semen quality variables using a mixed model for repeated measurements in the same boar over time were evaluated. The Spearman correlation coefficients between variables were calculated. The variables: macro, micro and pyriform head; double, eccentric, and thickened midpiece; tail whip; ladder bow; ball and distal reflex showed less than 1% prevalence. The highest values of FMI were found in cm and pp. Males cp, cm and pm do not differ from each other in MFI, but all had higher values than pp. The ACRI in cm was higher than cp, and these higher than pm. Presentation of TCD increased with age, with a higher percentage of PCD in older animals than in younger animals; mature animals showed intermediate values between them. The TCD exceeded 15% of presentation, being always higher for PCD than for GCP. The TCD is negatively correlated with MSI and ARCI, but positively correlated with MFI. The same trend is observed in the correlations with distal cytoplasmic droplets. However, the correlation of proximal droplets with the structural integrity loses significance, though they are negatively correlated with acrosome integrity. Values for MSI, MFI and ACRI, do not limit the quality of the samples in this population.

Keywords : boar sperm; semen analysis; semen quality; sperm.

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