Twenty-nine healthy women ( 24-37 y ) each randomly received a different test protein intake ( range : 0.22-2 .56 g kg ( -1 ) d ( -1 ) ) during each study day in early ( n = 35 observations in 17 women ) and late ( n = 43 observations in 19 women ) gestation ; 7 women participated in both early and late gestation studies .