Journal of Food, Agriculture and Environment

In situ ruminal degradation characteristics of dry matter and crude protein of imported hays marketed to the Korean cattle industry: A field study


Farhad Ahmadi, Youn Hee Lee, Mi Joo Ko, Do Young Choi, Wan Sup Kwak*

Recieved Date: 2017-02-03, Accepted Date: 2017-03-17


The appropriate inclusion of forages in ruminant diets is complicated by inconsistent nutritive qualities, and thus requires a more specific characterization of their degradation profiles in the rumen than currently exists in the literature. The objective of this study was to estimate ruminal dry matter (DM) and crude protein (CP) degradation kinetics of imported hays, namely timothy (Phleum pratense), tall fescue (Festuca arundinacea), kleingrass (Panicum coloratum), annual ryegrass (Lolium rigidum) and alfalfa (Medicago sativa), marketed to the Korean cattle industry. Duplicate dacron bags containing the hays (mean particle size of 2 mm) were incubated in situ in the rumen of three Hanwoo cattle and removed at 1, 2, 4, 6, 12, 24, 48, and 72 h after incubations. The soluble A fraction of DM and CP was the lowest for annual ryegrass and the greatest for alfalfa hay. The B and C fractions of DM and CP were similar among the hays. The degradation rate of the B fraction of DM was similar among the hays; however, that of CP was fastest in the order of: alfalfa, kleingrass, tall fescue, and timothy (average 3.8% h”1), and slowest for annual ryegrass (1.6% h”1). The in situ degradability of CP, assuming a passage rate of 0.05 h”1, was highest for alfalfa (67.7%) and kleingrass (64.0%), intermediate for tall fescue (54.3%) and timothy (52.0%), and lowest for annual ryegrass (42.0%). This study provided estimates of the ruminal DM and CP degradation kinetics of selected hays, which might be useful for dynamic models of protein and carbohydrate digestion and are thus valuable to determine their appropriate inclusion in the diet through ration formulation programs.


Crude protein, hay, cattle, rumen degradable protein (RDP), degradability

Journal: Journal of Food, Agriculture and Environment
Year: 2017
Volume: 15
Issue: 2
Category: Agriculture
Pages: 80-85

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