These replies have been very useful. After breakfast today our saddleback sow was mounting every other pig in the pen, including her daughters, despite her vulva looking much the same as usual. However, with back pressure, one spray and a little stimulation she froze completely for 5 minutes - felt very sorry for her I didn't have either a boar or catheter available, but in 3 weeks time one or other will be provided for sure! Thanks for your help - don't know what I'd do without this forum, it is brilliant being able to access all your knowledge and experience - Tamsaddle