Studies on ruminant saliva. 1. The composition and output of sheep's saliva

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Abstract
The composition of the mixed and parotid salivary secretions of the sheep was studied. The dry matter, 1-1.4 g./100 ml., of both fluids was mainly inorganic but contained small amts. of N, 9 to 36 mg./100 ml. The mixed secretion usually appeared to consist largely of parotid saliva,, The concns. of total salts in the latter, 180 mequiv./l., and of the principal cations, Na and K, were similar to those occuring in serum. The concns. of the anions, of bicarbonate, and of phosphate and chloride, were approx. 4 times, 15 times and 1/6,, respectively, as much as those obtained in the serum. The Co2 content of the parotid saliva, mixed secretion and rumen liquor was 233, 25-200 and 40-170 ml./100 ml., respectively. The parotid saliva had an avg. pH of 8.2 and was calculated to be actually secreted with a pH of 8.1. The amt. of saliva formed by a single parotid gland ranged from 930 to 1840 ml. in 24 hrs.

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