Cotton-top tamarins

If someone could help it would be excellent.

I am translating an article related to this kind of monkeys but I would like a review on this part, please:

Cotton-top tamarins were tested with the same
stimulus set as the newborns. Instead of sucking rate, however,
we used a head orientation response toward the loudspeaker.

"Los monos tamarins fueron evaluados con el mismo estímulo empleado en los recién nacidos. En lugar del procedimiento de succión, sin embargo, utilizamos la respuesta de orientación de la cabeza hacia el altavoz"

Thanks for your help.

Esperanza:

En lugar de: procedimiento de succion, lo cambiaria por "ritmo de succion".

El resto me parece correcto. Saludos, ANAVET.

I think it'll be better off in this forum.

I'd like to have an explanation about "better off"

Better off: mejor

according to Wordreference