Hi david,personally i never rob an generally give full crops on single kills in a hawks first season,then il starve a day or two followed by a low value feed like washed meat to stretch the crop an receptors,on the third day il usually be back to normal out hunting or lure chases for fitness,i usually fly on split chicken necks asi find it easy to maintain weight an fitness on these supplemented with kills.i do fly at hares and use big lures or carcases to start hawks ,but i do find this more important for males aswell as harris or goshawks,i find with female redtails once the've a few kills a