CGA and Rectal prolapse: Although no data exist regarding sAA, CgA in saliva of pigs seems to be not affected by circadian rhythms [26].-2.The behavior of CgA and sAA in saliva in chronic stress should be evaluated more deeply. Although both biomarkers are related to the ANS, and therefore to the reaction occurring after acute stress, changes in CgA and sAA have been described in situations of stress of longer duration, for example:sAA showed increases in pigs suffering  pain due to lameness and rectal prolapse [27].