Are you talking about the damage done by a rooster or by the hens pecking each other? Saddles are mainly for hen protection on their backs from the rooster mounting them. In this case a saddle will help.
If you're talking about hens pecking each other, then it's likely to be a management problem. Hens engage in severe pecking when they don't have enough room to live with each other, not enough protein in their diet or another deficiency or stressor in their lives.
Try to increase their protein intake by either getting a higher protein food like Flock Raiser (20%) or by giving them high protein snacks like meat or meal worms two or three times per week.
More importantly, examine their living area. The minimum recommended spacing for standard chickens is 4 square feet per bird inside the house and 10 sq ft per bird outside for a total of 14 sq ft. This is a minimum and most chicken people, including myself, agree that more is better. I have six birds and while they have the 4 sq feet inside the house they have 160 sq ft of run and then the entire yard (1/10 acre) during the day.
You'll probably find that pecking will decrease with more room.
If this isn't feasible you can try chicken toys like a Flock Block, hanging cabbage heads or the like, but they're of limited effectiveness if the chickens don't have enough room.
But if they're getting a good feed, the likely culprit is space.
Mary
