Figure 1.
Figure 1.

Flow diagram of the pulmonary arterial pressure testing (mean, systolic, and diastolic pressures) performed according to age, location, altitude, time of year, and the number of cattle tested on each occasion. At 6 mo of age, mean, systolic, and diastolic pressures were collected from the same 60 calves tested at 4 mo of age and mean pulmonary pressures were obtained from an additional 93 calves. In total, 31 steers were tested on 4 occasions: 18 steers were tested at 4, 6, 13 (Group A [A]), and 18 mo of age, and 13 steers were tested at 4, 6, 13 (Group B [B]), and 18 mo of age. *P < 0.05

 


Figure 2.
Figure 2.

Box and whisker plot of A) mean pulmonary arterial pressures (mPAP), B) systolic pulmonary arterial pressures (sPAP), C) diastolic pulmonary arterial pressures (dPAP), and D) pulmonary arterial pulse pressures obtained from healthy male Angus calves according to age (d) and altitude (m). Measurements taken at altitudes of 2,170, 1,560, and 1,300 m are colored green, blue, and red, respectively. Hollow symbols represent outliers (observations that are greater than 1.5 times the interquartile range from the nearest quartile).

 


Figure 3.
Figure 3.

Illustrative line graph showing changes in A) systolic pulmonary arterial pressure (sPAP), B) mean pulmonary arterial pressure (mPAP), and C) diastolic pulmonary arterial pressures (dPAP) for male Angus calves tested at 4, 6, 13 (Group A), and 18 mo of age that did not receive a growth promoting implant (n = 8). Each calf is represented with a different marker and color. Dashed red and green lines represent 2 steers that had noticeably greater mPAP at 18 mo of age than the other 6 steers. Dotted lines link observations for the remaining 6 calves.