Bush, M., Custer, R., Smeller, J. et al. 1977. Physiologic measures of nonhuman primates during physical restraint and chemical immobilization. Journal of the American Veterinary Medical Association 171, 866-869.

Of 56 physically restrained [during blood collection] primates, 30 (54%) experienced severe metabolic acidosis (p. 866). The animals had more rapid respiration and pulse rates, higher rectal temperatures, and larger base deficit. ... Primates immobilized with ketamine ... had a near normal acid-base balance.