Excessive heating of 00-rapeseed meal reduces not only amino acid digestibility but also metabolizable energy when fed to growing pigs

Abstract

Two experiments were conducted to test the hypothesis that both the degree of heating and the time that heat is applied will affect the concentration of digestible energy (DE) and metabolizable energy (ME), and the apparent ileal digestibility (AID) and the standardized ileal digestibility (SID) of amino acids (AA) in 00-rapeseed meal (00-RSM) fed to growing pigs. The 9 treatments were prepared using a conventional 00-RSM that was either not autoclaved or autoclaved at 110ºC for 15 or 30 min or at 150ºC for 3, 6, 9, 12, 15, or 18 min. In Exp. 1, 20 growing barrows with an average initial body weight of 21.2 ± 1.2 kg were randomly allotted to the 10 diets in a replicated 10 × 4 Youden Square with 10 diets and 4 periods in each square. A corn based basal diet and 9 diets containing corn and each source of 00-RSM were formulated. Urine and fecal samples were collected for 5 d after 7 d of adaptation. In Exp. 2, nine diets contained one of the 9 sources of 00-RSM as the sole source of AA, and an N-free diet that was used to measure basal endogenous losses of AA and CP was formulated. Twenty growing barrows with an initial body weight of 69.8 ± 5.7 kg had a T-cannula installed in the distal ileum and were allotted to a 10 × 7 Youden square design with 10 diets and 7 periods. Ileal digesta were collected on d 6 and 7 of each 7-d period. Results from the experiments indicated that there were no effects of autoclaving at 110ºC on DE and ME or on AID and SID of AA in 00-RSM, but DE and ME, and AID and SID of AA were less (P < 0.01) if 00-RSM was autoclaved at 150ºC compared with 110ºC. At 150ºC, there were decreases (quadratic, P < 0.05) in DE and ME, and in AID and SID of AA as heating time increased. In conclusion, autoclaving at 110ºC did not affect ME or SID of AA in 00-RSM, but autoclaving at 150ºC had negative effects on ME and SID of AA and the negative effects increased as heating time increased.

An automatically progressed computer-controlled simulated digestion system to predict digestible and metabolizable energy of unconventional plant protein meals for growing pigs

“…(2012) reported the concentrations of NDF and GE affected the DE of rapeseed meal for growing pigs. In the current study, the DE (3,448 kcal/kg of DM) and ME (3,107 kcal/kg of DM) values of rapeseed meal were close to those reported by NRC (2012) and Oliveira et al. (2020) .…”

High replacement of soybean meal by different types of rapeseed meal is detrimental to rainbow trout (Oncorhynchus mykiss) growth, antioxidant capacity, non-specific immunity and Aeromonas hydrophila tolerance

“…From 2016 to 2020, the global RSM production continued to grow, and which was 40.74 million tons in 2020 ( 6 ). However, the quality of RSM mainly depend on the variety, origin and processing method ( 7 , 8 ), and which is strongly related to the presence of various antinutritional factors such as glucosinolates, tannin, phytic acid and erucic acid levels ( 9 – 11 ). Currently, RSM is primarily produced in European Union, Canada, China, and India.…”