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http://dx.doi.org/10.5187/JAST.2003.45.3.433

The Effects of Processing Methods of Corn on In vitro DM Digestability and In sacco Degradability in Rumen  

Son, K.N. (Devision of Animal Science & Resources, Chungnam National university)
Kim, Y.K. Kim (Devision of Animal Science & Resources, Chungnam National university)
Lee, S.K. (Devision of Animal Science & Resources, Chungnam National university)
Kim, H.S. (National Livestock Research Institute)
Publication Information
Journal of Animal Science and Technology / v.45, no.3, 2003 , pp. 433-442 More about this Journal
Abstract
The objective of these studies were to examine the effects of processing methods of corn grains on in vitro dry matter digestability and in sacco degradability in the rumen by three ruminally cannulated dry Holstein cows. The corns for these experiments were untreated; whole corn L(density; 660 g/$\ell$), whole corn H(density; 740 g/$\ell$), and treated by four different types: Ground corn, 3.8 mm, 2.8 mm, and 1.5 mm flaked corns. The results obtained were summarized as follows: The DM degradabilities, after 48 hr incubation by in sacco method, were the highest(94.4, 88.0 and 87.0%, respectively) in 1.5 mm flaked corn, ground corn, and 2.8 mm flaked corn. The 3.8 mm flaked corn was degraded significantly lower than these. Until 12 hr incubation, whole corn L tended to be degraded little more than whole corn H, was not significantly different. However, after 24 hr incubation, the significant differences between whole corn L and whole corn H were shown(P<0.05). The DM digestabilities by in vitro digestion were the highest for 1.5 mm flaked corn and ground corn(92.3 and 91.2%, respectively)(P<0.05), followed by 2.8 mm and 3.8 mm flaked corn(83.9 and 83.4%, respectively), tended to be similar to those by in sacco method. Whole corn L was digested twice more rapidly than whole corn H. Summarizing the experimental data, compared with unprocessed corns, the flaked corns were significantly increased in the degradabilities of dry matter in the rumen. In addition, as increasing the flaking degree of corn, the degradabilities of dry matter were significantly improved. Referring to these kinds of physical characteristics of grain sources in the ruminal degradabilities, it is believed to be possible to optimize the environment of the fermentation in the rumen.
Keywords
In vitro digestability; In sacco dry matter degradability; Processing methods; Corn grains;
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