Masala 10: Male or female camel, cow, buffalo, goat, sheep, and ram are all permissible.
Masala 11: A camel must of 5 years, a cow and buffalo of 2 years, a goat, sheep, and ram of 1 year. If the animal is younger than this then qurbani is not permissible, if older than this then it is permissible, in fact it is better. However, if the six-month old offspring of sheep or ram is so big that from looking from afar the sheep or ram looks like a year old then it is permissible.
Masala 12: It is wajib for a sahibun nisaab to slaughter one goat or to slaughter a seventh of camel, cow, and buffalo, it is not permissible to slaughter less than one seventh of the animal.
Masala 13: To slaughter more than a seventh is permissible such as five or six persons slaughtering a cow or buffalo, rather, one person may do qurbani of a whole cow.