were individually housed in metabolism crates and fed
experimental diets for 16 d, including 9 d for adaptation
to feed and 5 d for total but separate collection of
feces and urine. The apparent total tract digestibility
values of P increased from 19.0 to 30.0% for BNB and
from 17.3 to 28.3% for BJY as the dietary P content
increased from 0.8 to 3.3 g/kg DM. The TTTD of P
was determined using the regression analysis as dietary
P content increased from 0.8 to 3.3 g/kg whereas the
STTD of P was calculated for the diet with the highest
P content (i.e., 3.3 g/kg, as-fed basis) using the P-free
diet to estimate endogenous P losses (EPL). The total
and basal EPL estimates obtained with regression
analysis and the P-free diet were 665 ± 0.03 and 209 ±
96 mg/kg DMI, respectively. The TTTD of P was 33.3
and 32.0% in BNB and BJY, respectively. Respective
STTD values were 31.0 and 28.3%. The results indicated
that the TTTD and STTD of P were comparable
in the 2 canola meals from BNB and BJY canola.