Development of fever in the newborn lamb

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Abstract
Newborn lambs do not become febrile in response to (i.v.) bacterial [Salmonella abortus equi] endotoxin [etox] in moderate doses. Newborn lambs were tested to see if they could become febrile to large doses of etox or to endogenous pyrogen. At 5 h of age lambs do not become febrile to relatively large doses of etox or to endogenous pyrogen, but rather become hypothermic. At 32 h and all subsequent times, fevers could be elicited. Onset time of fevers in lambs was short initially and gradually lengthened over 9 days, at which time it was similar to the onset time of the adult fever. With respect to the febrile response, newborn lambs showed varying degrees of tolerance after 20 days of daily injections of etox, as compared to the ewe which becomes tolerant in 2 or 3 days.