Expeller Soybean Meal: Evaluation of Holstein Cow Production and in Vitro Ruminal Kinetic

Abstract

We aimed to evaluate the inclusion of expeller soybean meal on the quality and milk production of Holstein cows, as well to estimate and compare the inherent parameters of the in vitro ruminal kinetics. Data collection was carried out on a private property, in the interior of the municipality of Dois Vizinhos - Paraná, Brazil. Twenty Holstein cows were used, divided into two treatments: one with the inclusion of expeller soybean meal and the other with conventional soybean meal. The design used was completely randomized with parity. Milk production was evaluated through weighing. Milk samples were collected on days 0, 15, 30 and 45 to evaluate the milk protein, fat, urea nitrogen, lactose and total solids. The In vitro ruminal kinetics of convencional and expeller soybean meal was performed at the Universidade Tecnológica Federal do Paraná – Paraná, Dois Vizinhos. The gas pressure and volume measures were taken after 1, 2, 3, 6, 8, 10, 12, 16, 20, 24, 30, 36, 48 and 72 hours of sample incubation. The results obtained were applied in a two-compartmental mathematical model with no latency time in the first compartment for description of ruminal kinetics. Data were analyzed by variance (ANOVA) and compared by the F test. There was no significant difference in any of the variables evaluated from mil production and quality when soybean meal expeller was included in the animals' diet (P>0.05). The expeller soybean meal showed a lower degradation compared to the conventional meal. There were no significant differences for milk production as for concentration of solids in milk.

Keywords

• Protein degradability
• protein sources
• milk fat
• rumen
• undegradable protein