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Seven generations of selection for high and low blood pressure in chickens.

Abstract THE inheritance of blood pressure has been reported in humans (McKusick, 1960; Pickering, 1955; Roberts, 1964; and Thomas and Ross, 1964), rabbits (Alexander et al., 1954), rats (Smirk and Hall, 1958; Sturtevant, 1953) and mice (Schalager, 1965; Schlager and Weibust, 1967). Heritability estimates were variable depending on the method of analysis and other factors, with values ranging from about 11 to 53 percent, but with most values between 20 and 40 percent. Sturkie et al. (1959) reported the heritability of blood pressure in chickens averaged 28 percent based on regression of offspring on mid-parent (average of three generations), but about 25 percent for the first year based on the difference in blood pressure of selected hypotensive and hypertensive strains, and less in subsequent generations. In that study most of the change in blood pressure with selection was in the hypertensive line, but no random line was used for comparison. Moreover,…