English to Spanish Other Livestock / Animal Husbandry

It describes the effect of a chemical over a study gruop compossed of rats, I havent found the word on the internet, not even in english which leads me to believe that it is a spelling error by the author. Nevertheless I would like to know if anybody has ever heard of the term. I quote: "The effects lasted until day 13, except for the loss of hair and incrustations of the labial committure, which were aparent until the last day of the observation"