J. Anim Sci.
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J. Anim Sci. 1969. 29:62-68.
© 1969 American Society of Animal Science
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Digesta of Sheep Fed Different Hay-Grain Ratios

H. M. Vidal1, D. E. Hogue, J. M. Elliot and E. F. Walker, Jr.

Cornell University, Ithaca, New York2

Abstract

Four groups of four lambs each were fed chromic oxide containing diets of varying hay-grain ratios (100:0, 75:25, 50:50, 25:75), digestion trials were conducted, the animals killed and samples of the digesta collected from the rumen-reticulum, omasum, abomasum, duodenum-jejunum, ileum, cecum and large intestine. These were analyzed for dry matter, ether extract, chromic oxide and neutral detergent fiber. Samples of the feed, feces and abomasal and ileal samples were analyzed for starch and additional rumen fluid samples collected and analyzed for acetic, propionic and butyric acids.

Expected differences were observed in the chemical composition and digestibility of the diets. The chromic oxide concentration in the duodenum showed a marked decrease and this is attributed to the massive influx of endogenous dry matter. This is calculated to be from 1 (100% hay) to 2 (25% hay) times the contribution of dietary origin to the duodenal contents. The estimations of digestible dry matter of the diets by total collection and by chromic oxide ratio calculations were not different.

Estimations of the starch reaching the abomasum and disappearing from the lower tract were made based on chromic oxide ratios. These estimates were 10, 33, 52 and 120 gm./kg. of diet on the 100, 75, 50 and 25% hay diets, respectively. This starch in the abomasum is offered as a possible explanation for the differences in efficiency of utilization of digestible energy from hay and concentrate diets.

Footnotes

1 Present address: Estacion Experimental Agropecuaria, Lambayeque, Peru.

2 Department of Animal Science.






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