Comparison of Tropical Forages of Known Composition with Samples of These Forages Collected by Esophageal Fistulated Animals

Abstract

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Measurement of Selective Grazing of Tropical Pastures Using Esophageal Fistulated Steers

“…Techniques described by Marshall et al (1967) were used in a field trial situated in Ankole Kingdom, Uganda.…”

Technical Note: Collection and preparation techniques change nutrient composition of masticate collected from esophageally fistulated cattle1

“…Serum urea nitrogen levels tended to be greater for cows on the high-CP diet (27.6 ± 4.0 vs. 23.5 ± 3.2 mL/dL for high vs. low CP, respectively; P = 0.08). Although saliva contains only a small amount of N, previous studies demonstrate increased N concentration in masticate samples (Lesperance and Bohman, 1963;Blackstone et al, 1965;Marshall et al, 1967), whereas others indicate it has little effect on N content of masticate (Bath et al, 1956). Weir and Torell (1959) calculated added N attributed to salivary contamination of masticate samples collected from esophageally fistulated sheep would raise the protein content only less than 0.01%.…”

Correcting for Salivary Contamination of Esophageal Fistula Samples

“…Cr= (C.-C&i)/ Ed. (11) Marshall, et al (1967) found 0.9% dry matter in bovine saliva and reported the composition of saliva dry matter (Table I). Hart et al (1983) noted dry matter concentrations of SO and 23% in range forage and ejecta, respectively, when samples of each were collected simultaneously.…”

“…Furthermore, the composition of saliva can be determined and the dry matter content of the Table 1. Composition of bovine saliva (Marshall, et. al.…”