Squeezes that hurt cattles' necks make them more difficult to get back into the chute and headgate next time. A new experience can be a big stressor . Introduce new objects or situations slowly and they are attractive to the animal. Something that is novel can be attractive, but can also be a scary thing if it moves or comes at them quickly. Livestock are sound sensitive .
Sounds usually signal danger.
Whistles and yelling are strong stressors and only serve to work cattle up. Visually stock are sensitive to contrast and shadows . They don't want to go into an opening that appears as a dark hole. Handling areas need indirect lighting , not bright lights, shining into animals faces or casting deep shadows. Look at what your animals are afraid of and try to remove these stressors from the alleyways and chutes.