Immune-spaying as an alternative to surgical spaying in Iberian × Duroc females: Effect on carcass traits and meat quality characteristics

The aim of this study was to assess the effect of immune-spaying on production traits and meat quality characteristics of fresh loin (longissimus dorsi) by comparing 3 groups of Iberian × Duroc females (N = 12 per batch): surgically spayed, immune-spayed and entire females. Carcass traits and physicochemical parameters, including fatty acid profile, were investigated. The only carcass trait significantly affected by castration was the ham fat thickness, where both immune-spayed and surgically spayed females showed higher values against entire females (57 ± 9.5 mm, 62 ± 2.5 mm and 51 ± 10.1 mm, respectively; p < 0.05). Furthermore, there were no significant differences in the quality parameters of fresh meat. These results are important regarding animal welfare, since in Europe, there is a plan to voluntarily end the surgical castration of pigs by 2018. Therefore, with an adequate vaccination protocol, immune-spaying might represent a good alternative to surgical spaying. The reliability of immune-spaying over long periods should be evaluated.