Yes, they can have most table scraps, including meats... Consult a list of what to avoid, and remember moderation is your friend when it comes to 'treats'...
Bright orange yolk color is from xanthophylls (natural yellow pigments) these are found in 'greens' so give you chickens treats like kale, spinach, broccoli, collards, zucchini, brussels sprouts and the sorts...
Also a balanced diet that includes animal proteins and animal fats will improve the...