Energy concentration and phosphorus digestibility in canola, cottonseed, and sunflower products fed to growing pigs

Abstract

Rodríguez, D. A., Sulabo, R. C., González-Vega, J. C. and Stein, H. H. 2013. Energy concentration and phosphorus digestibility in canola, cottonseed, and sunflower products fed to growing pigs. Can. J. Anim. Sci. 93: 493–503. Many protein sources are available to the swine feed industry, but accurate data for the energy concentration and the standardized total tract digestibility (STTD) of P in these ingredients are lacking. Therefore, two experiments were conducted to determine the concentration of digestible energy (DE), metabolizable energy (ME) and the STTD of P in oilseed products. In exp. 1, 48 barrows (44.8±3.9 kg) were fed a basal diet containing 97.15% corn or seven diets containing corn and canola seed (CS), canola meal (CM), cottonseed meal (CSM), sunflower seed (SFS), sunflower meal (SFM), de-hulled sunflower meal (SFM-DH), or soybean meal (SBM). Six pigs were allotted to each treatment. Sunflower seeds contained 5492 kcal kg−1, at least 689 kcal kg−1 more (P<0.05) ME than all other feed ingredients. Likewise, CS (4803 kcal kg−1) had greater (P<0.05) ME than SBM (3676 kcal kg−1), and both CS and SBM had greater (P<0.05) ME than CM, SFM, SFM-DH, and CSM (2998, 2725, 2631, and 2459 kcal kg−1, respectively). In exp. 2, 84 barrows (13.7±1.5 kg) were allotted to 14 diets, which contained each of the oilseed products without or with phytase, in a randomized complete block design with six pigs per dietary treatment. The STTD of P in SBM was at least 4 percentage units greater (P<0.05) than the STTD of P in the other ingredients. Adding phytase to the diets reduced fecal output of P from all ingredients and increased (P<0.05) the STTD of P for all ingredients except SFM-DH. The ME concentration in SFS and CS is greater than that of SBM and the STTD of P among these ingredients is comparable, which indicates that SFS and CS may be fed to growing pigs at the expense of SBM.

High dose of phytase on apparent and standardized total tract digestibility of phosphorus and apparent total tract digestibility of calcium in canola meals from Brassica napus black and Brassica juncea yellow fed to growing pigs

“…The ATTP of P without phytase in our study were higher than some of the published values for ATTD of P without phytase and such values were in between 27% and 33% (Wu et al 2008;Akinmusire and Adeola 2009;NRC 2012). However, current values for ATTD of P were lower than a study reported where the ATTD of P (%) were 52.2 and 68.9 without and with phytase, respectively (Rodríguez et al 2013). The reason behind the variability in P digestibility observed among canola seed and CM is due to the percentage of P that is bound to phytate where CM had higher digestibility than canola seed (Selle and Ravindran 2008;Rodríguez et al 2013).…”

“…However, current values for ATTD of P were lower than a study reported where the ATTD of P (%) were 52.2 and 68.9 without and with phytase, respectively (Rodríguez et al 2013). The reason behind the variability in P digestibility observed among canola seed and CM is due to the percentage of P that is bound to phytate where CM had higher digestibility than canola seed (Selle and Ravindran 2008;Rodríguez et al 2013). The minimum ATTD of P in CM in the present experiment (39.76% for BNB) was closer to the percentage of nonphytate P (37%) in the BNB.…”

“…The minimum ATTD of P in CM in the present experiment (39.76% for BNB) was closer to the percentage of nonphytate P (37%) in the BNB. This observation may be a consequence of release of similar amounts of phytate-bound P in the stomach and small intestine of pigs (Rodríguez et al 2013). …”

Coefficient of standardized total tract digestibility of phosphorus in oilseed meals and distillers dried grains in growing-finishing pigs

“…The levels of CTTAD and CTTSD of P in CAM in the present study are almost two times greater than those reported by others (Fan & Sauer, 2002;Akinmusire & Adeola, 2009;NRC, 2012;Rodríguez et al, 2013). However, availability of P in CAM is lower than that of SBM (NRC, 2012;Rodríguez et al, 2013).…”

“…However, availability of P in CAM is lower than that of SBM (NRC, 2012;Rodríguez et al, 2013). The reason for this might stem from the high level of phytate in CAM compared to SBM (NRC, 2012;Rodríguez et al, 2013).…”