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Ruminal dry matter, crude protein, and neutral detergent fiber degradation of whole-plant soybean silage.

L. G. Ghizzi



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Ruminal dry matter, crude protein, and neutral detergent fiber degradation of whole-plant soybean silage.
L. G. Ghizzi*1,3, T. A. Del Valle2, C. Heinzen3, M. R. Pupo3, L. F. Ferraretto3, F. P. Renn�1. 1University of S�o Paulo Pirassununga, SP, Brazil, 2University of Pampa Itaqui, Rio Grande do Sul, Brazil, 3University of Florida Gainesville, FL.

This study aimed to evaluate the effects of molasses (MOL) on whole-plant soybean silage (WPSS) with different phenological stages (PS) on the ruminal degradation kinetic parameters and effective degradability (ED) of dry matter (DM), crude protein (CP), and neutral detergent fiber (NDF). Treatments were arranged in a factorial 3 � 2 with a completely randomized design to evaluate both PS of WPSS [R5 (beginning seed), R6 (full seed), and R7 (beginning maturity)] and MOL (0 and 40 g/kg fresh forage). Whole-plant soybean silage was made into 60 experimental silos with 650 kg/m3 bulk density and stored at room temperature for 90 d. Degradation parameters and ED of DM, CP, and NDF, were determined with the in situ nylon bags method by ruminal incubation in 3 lactating Holstein cows for 0, 3, 6, 12, 24, 48, 72, 120, and 240 h. Ruminal rapidly (fraction A), slowly (fraction B) and undegraded (fraction C) fractions, rate constant of degradation (kd), and ED (at ruminal passage rate of 0.03 h−1) were calculated using the exponential model of �rskov and McDonald (1979) using PROC NLMIXED of SAS 9.3. In general MOL increased (P ≤ 0.002) fraction A and ED, decreased (P ≤ 0.016) fraction C without effecting (P ≥ 0.131) fraction B and kd for DM, CP, and NDF except fraction B for DM which decreased (P = 0.037). Increasing PS increased (P < 0.001) fractions A and B, kd, and ED while decreasing (P < 0.001) fraction C for DM and CP. Whereas increasing PS increased (P < 0.001) fraction A and ED and decreased (P < 0.001) fractions B and C and kd for NDF. The magnitude of effect for MOL was lower with increasing PS. Although greater results were observed in early PS, MOL can be used in WPSS to increase DM, CP, and NDF degradation regardless of PS. Additionally, R7 optimizes ruminal DM, CP, and NDF degradation.

Keywords: additive, in situ degradation, legume ensiling.

Biography: Graduated in Medicine Veterinary, M. Sc. in Animal Sciences, currently is Research Scholar at University of Florida - USA and a Ph.D. student in Animal Sciences at University of S�o Paulo, Brazil.