Abstract
THE resistance of neonatal mammals to hypoxia is well known (Britton and Kline, 1945; Chiodi, 1963; Van Liere and Stickney, 1963; Fazekas et al., 1941). This tolerance decreases in all mammals until within a few days or weeks they are as susceptible as adults. The hypoxic tolerance of the newly hatched chick, however, has never been determined.Several investigations, however, have found that newly hatched chicks are not completely homeothermic until they are several days old (Romanoff, 1941; Randall, 1943; King, 1956; Lamoreux and Hutt, 1939; Deaton and Reece, 1968; Klieber and Winchester, 1933; Klieber, 1938). Since it is well known that poikiliothermic animals are very tolerant to hypoxia (Hock, 1964), it would be anticipated that newly hatched chicks would be very tolerant to reduction in environmental oxygen.METHODSSingle Comb White Leghorn chicks, 0 to 31 days of age were exposed in groups of 10 to acute hypoxia in…
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