Table 2. Values for the affinity and cooperativity parameters of animal blood hemoglobin binding curves^a.

Animal	P50 (mmHg)	nH
Elephant	23.03 ± 0.32	2.49 ± 0.04
Horse	29.26 ± 0.16	2.59 ± 0.01
Human	33.02 ± 0.29	2.74 ± 0.03
Sheep	38.82 ± 0.11	2.83 ± 0.01
Fox	42.36 ± 0.22	2.92 ± 0.02
Cat	43.22 ± 0.62	3.01 ± 0.06
Rat	55.63 ± 0.57	3.23 ± 0.05
Mouse	57.86 ± 0.76	3.32 ± 0.07

^aValues for the point of half-saturation (P₅₀) and the Hill coefficient at half-saturation (n_H) were derived by fitting blood sample animal Hb oxygen saturation curves (Schmidt-Neilsen and Larimer, 1958; Schmidt-Nielsen, 1970) to the Hill equation.