I have 4 young male muscovys that I plan on keeping through the winter and selling in the spring. I have been feeding them the feed mixture that everyone else gets but its getting expensive and as they are not laying eggs or breeding I dont think they need it. What would be a good, hopefully inexpensive way of feeding them? I have heard just cracked corn would be ok but IMO I dont think it is and it makes them fat. Someone also told me scratch would be ok? Thoughts?