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Salt Requirements of Lambs^{1, 2,}

Purdue University, W. Lafayette, Indiana 47907

Abstract

Three experiments utilized daily drenchings during 35 to 45 days of from .02 to .80% salt, following a depletion period of from 77 to 129 days. The fourth experiment was a group feeding experiment (% days) in which added levels of 0, .25 and .50% salt were added to an otherwise accepted feedlot ration which contained the equivalent of .19% salt, based on sodium analyses.

Dietary salt requirement for growing lambs ranged between .33 and .43% of the air-dry ration (90% dry matter) which is a 95% CI based on the pooled data from three experiments. The R² values accounting for salt alone in each experiment are .28, .50 and .50, respectively. For the overall study 30% of the variability can be accounted for by salt. The optimal level of salt intake via drench was .38% and for oral feeding was .39%. The ADG were alike in the feedlot study (.17 kg/lamb/day) but the feed efficiencies were 3% and 26% poorer for the higher and the lower salt additions, respectively. Since most sheep rations contain approximately .20% salt, a supplemental level of .20% is adequate.

¹ Journal Paper No. 5317, Purdue University Agricultural Experiment Station.

² Trie research reported herein was supported by a grant-in-aid from International Salt Company, Clarks Summit, Pennsylvania.

³ The reported research was presented by the senior author to the faculty in partial fulfilment of the requirement for the degree of Master of Science.

⁴ The authors acknowledge the assistance of Mrs. Alice Bales with the chemical analyses.