A total of 42 barrows weighing 19.8 ± 1.22 kg were fed seven diets to give six replicates per treatment. The experiment was conducted in a factorial arrangement with factors being (1) two canola meals (CM) types and (2) three phytase levels (0, 500, and 2500 FTU kg-1). The basal endogenous phosphorus (P) losses and standardized total tract digestibility (STTD) was calculated using the P-free method. There was no effect of CM types on feed intake and fecal P output, but an interaction effect was observed for P intake (CM × phytase; P < 0.05). Supplementation of phytase (2500 FTU kg-1) reduced (P < 0.001) fecal P output (g d-1), and the output was reduced by 58% in Brassica napus black (BNB) and 64% in Brassica juncea yellow (BJY) diets. Supplementation of phytase improved (P < 0.001) both apparent total tract digestibility (ATTD) and STTD of P in both BNB and BJY, regardless of dose. The basal endogenous P loss (EPL) was determined to be 111.28 ± 35.09 mg kg-1 of dry matter intake (DMI). There was no further improvement in STTD of P when phytase was increased from 500 to 2500 FTU kg-1 in both CM types. The ATTD of calcium (Ca) was increased (P < 0.001) in BNB and BJY when phytase was supplemented at 500 and 2500 FTU kg-1. The results, therefore, indicate that supplementation of phytase at 500 FTU kg-1 improved both ATTD and STTD of P in two CM types, but a super dose of 2500 FTU kg-1 had no additional benefit. Similarly, ATTD of Ca was increased when phytase was supplemented at 500 FTU kg-1 without further improvement at 2500 FTU kg-1.
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Vol. 96 • No. 2