Characterization of the nutritional value of Manitoba-grown peas (Pisum sativum) for pigs
Friesen, Melanie Joy
Four studies were conducted to investigate the chemical composition, AA digestibilities, feeding value, and economic value of field peas for pigs. In Study 1, nine pea cultivars (yellow-, and green-seeded) were analyzed for dry matter, crude protein, fat, NDF, ADF, starch and NSPs. Crude protein, starch and NSPs averaged 22.1% (range 20.0 to 24.2%),385 mg g-1 (range 331 to -428), and 87.7 mg g-1 (range 75 to 104) respectively among the cultivars. In Study 2, apparent, standardized and true ileal AA digestibilities of four pea-based diets (Profi, Swing, Croma and a mixture of AC Melfort, CDC Mozart, and Eclipse) were determined using ileal cannulated barrows (average initial body weight = 24.4 +- 1.8 kg) according to a 4 x 4 Latin square design. True ileal digestibilities were determined with the homoarginine or reactive lysine techniques. Apparent and standardized ileal AA digestibilities of the essential AA were different (P < 0.05) only for phenylalanine and leucine among diets, and averaged 74.3%o and 80.8%, respectively. True ileal AA digestibilities determined with the homoarginine method were similar among diets except for lysine, phenylalanine and valine. Overall true digestibilities for all AA were 97.0% and 99.8%, for the homoarginine and reactive lysine methods, respectively. In Study 3, the performance of nursery pigs fed increasing dietary levels of peas was evaluated. Ninety-six 17-day old weaned Cotswold (Platinum) pigs (6.05 +- 1.08 kg initial body weight) were randomly assigned to a corn-soybean-meal-based control (4 pens of 4 pigs each) and four pea-based diets (5 pens of 4 pigs each) containing 15,20, 25 or 30% peas (cultivar Swing) during a five week experiment...