Thirty-six ejaculates from three boars, equally diluted in the diluents Beltsville Thawing Solution (BTS), Modified Zorlesco (ZOR) and BTZOR (developed at Universidade Estadual de Maringá), were used to evaluate the characteristics of each ejaculate and the semen conservation period until 25% of progressive motility (PM) for each diluents. The experimental design was completely randomized blocks, blocking boar/month. The better conservation period was BTZOR (4.94±0.30 days), followed by ZOR (4.62±0.29 days) and BTS (3.27±0.30 days). Regression analyses showed a quadratic behavior for BTS and ZOR and cubic behavior for BTZOR to PM, as the days for conservation go through. Vigor (V) showed linear behavior to BTS and ZOR and quadratic behavior for BTZOR. Degree agglutination showed linear behavior for all diluents. The BTZOR maintained the quality for more days, maintaining the best averages of PM and V, followed by ZOR and BTS.
diluents; conservation days; semen; swine
