TOP 5 FASTEST-GROWING CHICKEN BREEDS FOR MEAT If you want chickens that grow fast and give you plenty of meat, choosing the right breed is key. Some chickens are naturally built for quick growth, big size, and efficient feed conversion. Here are five of the best meat breeds that grow fast and are perfect for farmers who want results. 1. Cornish Cross - Growth Speed: Very fast—ready in 6 to 8 weeks. - Why It’s Great: This is the most popular meat breed worldwide. They grow big, have broad breasts