公猪饲养，避免了手术阉割带来的痛苦，提供更好的性能，更大的肌肉组织沉积和胴体瘦削，从而对动物福利和产品都有有益的影响。一些不屠宰公猪的国家必须考虑到他们的公猪的污染、侵略性和性行为。考虑到猪是群居的，这可能会使社会等级的形成复杂化，并增加争斗和聚众行为，一些研究已经进行了研究，减少猪的数量每个猪圈，但这些行为继续观察。然而，关于对舍公猪繁殖状况的研究尚未见报道。本研究的目的是确定未阉割、免疫阉割和手术阉割的对舍公猪的生殖状态是否会改变它们的自然、好斗和性行为。从Agroceres PIC™基因中提取的48头公猪被分为三组:手术阉割(公猪)、免疫阉割(公猪)和未阉割(公猪)。对猪的自然、攻击性和性行为进行直接观察，每个周期12 h(屠宰前6周、5周和3周 和屠宰周)。从生长期到屠宰期间，猪是成对饲养的。观察动物从屠宰阶段到屠宰阶段的行为。胴体病变分为5类(1:无损伤; two to five: severely injured). Overall, boars spent more time lying and less time eating and drinking than barrows. In total of all the periods (48 h), boars expressed more aggressive and sexual behaviours than barrows, whereas immunocastrated pigs displayed similar behaviours to boars, before and after the second vaccine dose. No differences in carcass lesions between treatments and no prevalence of carcasses with severe injuries were observed. In conclusion, the reproductive status of pair-housed male pigs did not change the natural behaviour of boars, immunocastrated pigs or barrows. The agonistic and sexual behaviours of boars and barrows remained unchanged. When housing pigs in pairs, immunocastrated pigs presented similar agonistic and sexual behaviours to boars before and after the second immunocastration vaccine dose. The use of pair-housed uncastrated male pigs has generated welfare benefits for these animals, as the number of carcasses with injuries did not differ from barrows and immunocastrated pigs.