Expeller/cold-pressed canola as a valuable feed ingredient for poultry

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Sessingnong, Tetiana
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The utilization of the expeller/cold-pressing method for producing canola oil from its seeds is becoming increasingly popular. Apart from its relatively high protein content, expeller/cold-pressed canola (ECPC) retains residual oil, making it a valuable protein and energy source for poultry. Unlike the conventional pre-press solvent extraction process, cold pressing does not apply heat or moisture to canola seeds. As a result, the use of different processing technology leads to variation in the chemical composition and nutritive values of ECPC. Therefore, the primary objective of this research was to determine the detailed chemical composition and nutritive profile of twenty-two ECPC samples collected from canola seed expelling facilities in Western Canada. On a dry matter (DM) basis, ECPC contains on average 16.7% of ether extract (EE), 36.5% of crude protein (CP), 24.1% of neutral detergent fibre (NDF), 31.8% of total dietary fibre (TDF), 8.04% of sugars, 6.1% of ash, 1.0% of total P, 0.5% of non-phytate P, and 7.85 µmol/g of glucosinolates (GLS). The AMEn averaged 2386 kcal/kg but ranged from 2128 to 2604 kcal/kg, on a DM basis. Prediction equations for energy availability demonstrated a strong relationship between the fat, CP, ash, and NDF and the AMEn content (R2 = 0.94-0.99; P<0.05). The SIAAD of Lys, Met, Arg, and Thr averaged 85.2%, 93.5%, 88.1%, and 80.4%, respectively, and their standardized ileal digestible content averaged 1.61, 0.45, 1.57, and 1.17% on a DM basis, respectively. There were significant differences between plants in the standardized ileal digestibility of all amino acids except for Thr. Moreover, the significant variations were observed in the standardized ileal digestible content of all amino acids. The results of the growth performance study showed that there were no significant differences in the growth performance of broilers fed ECPC compared to the control treatment when diets were formulated based on digestible amino acid and metabolizable energy contents. Additionally, the developed prediction equations were successfully validated in growth performance study. Expeller/cold-pressed canola; chemical composition; broiler; AMEn; amino acids; growth performance