The father of Hisham bin Urwah (may Allah have mercy on him) says: When you are compelled to ride your sacrificial camel, ride it without overburdening it; when you are compelled to (drink) its milk, drink what remains after its calf has had its fill; and when you slaughter it, slaughter its calf along with it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10212