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Effect of Corn Preservation Treatments on In Vitro Digestibility, Ruminal pH and Volatile Fatty Acid Formation^{1, 2, 3,}

Purdue University, West Lafayette, Indiana 47907

Abstract

Dry Corn (DRY), ensiled high moisture corn (HM), ensiled reconstituted high moisture corn (RECON) and fatty acid treated high moisture corn (FA) were subjected to in vitro and in vivo comparisons.

In vitro digestion of dry matter (IVDDM) by mixed rumen inoculum was greatest for the HM and FA corn. IVDDM increased through all incubation periods, ranging from 1 to 72 hours. Regardless of length of incubation the concentration of starch was greatest for the DRY corn. Differences between treatments for the 1, 4, 24 and 48 hr. times, however, were not significant suggesting that differences in starch structure or content among the four types of corn are small.

Ruminal pH was unaffected by treatment but varied (P<.05) with time post-feeding. The concentration of propionic acid was greatest in the rumen fluid of steers fed DRY and FA corn, whereas, RECON and HM corn produced the greatest concentrations of acetic acid. Butyric acid concentration, however, was unaffected by treatment. The concentration of acetic and propionic acid also varied (P<.05) with time after feeding.

¹ Department of Animal Science, Journal Paper No. 5154 Purdue University Agricultural Experiment Station.

² Supported in part by grants-in-aid by Celanese Chemical Company, Corpus Christi, Texas and the Harvestore Division, A. O. Smith Corporation, Arlington Heights, Illinois. Materials and equipment were furnished by both companies.

³ Research in this paper was from a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy.