A castrated animal is not acceptable for sacrifice. The Messenger of Allah سبحانه وتعالى (peace and blessings be upon him and his family) sacrificed cattle on behalf of his wives. If a man purchases a sacrificial animal and it dies before being slaughtered, it suffices for him. If a man purchases a sacrificial animal and it is stolen, then purchasing another in its place is better. If he does not purchase another, there is nothing upon him. It is permissible to benefit from its skin, use it to purchase items, tan it to make a bag or prayer mat, or to give it in charity, which is better. If a man forgets to slaughter at Mina until he visits the House (Kaaba), and then purchases an animal in Mecca and slaughters it, there is no harm, and it suffices for him.