Influence of ruminai and postruminai starch infusion on energy balance in growing steers

K.R. Mcleod; R.L. Baldwin; D.L. Harmon; C.J. Richards; W.V. Rumpler

Influence of ruminai and postruminai starch infusion on energy balance in growing steers

In: Energy metabolism in animals

Authors:

K.R. Mcleod

K.R. Mcleod US Dept. of Agriculture, Agricultural Research Service, Nutrient Conservation and Metabolism Laboratory, Beltsville, MD 20705, USA

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R.L. Baldwin VI

R.L. Baldwin VI US Dept. of Agriculture, Agricultural Research Service, Nutrient Conservation and Metabolism Laboratory, Beltsville, MD 20705, USA

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D.L. Harmon

D.L. Harmon University of Kentucky, Lexington 40546, USA

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C.J. Richards

C.J. Richards University of Kentucky, Lexington 40546, USA

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W.V. Rumpler

W.V. Rumpler Energy and Protein Laboratory, Beltsville, MD 20705, USA

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Type:: Chapter

Pages:: 385–388

DOI:: https://doi.org/10.1163/9789004683600_094

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Summary

Influence of site of carbohydrate digestion on whole body energy balance was studied in growing steers. Eight beef steers with ruminai and abomasai infusion catheters were assigned to replicated 4 × 4 latin squares with 21-d periods. Treatments included a pelleted basal diet (89% orchard grass hay, 5% Soypass®, and 5% corn gluten meal) fed at 0.68 (LE) or 0.90 MJ ME • (kg BW.⁷⁵)⁻¹ •d⁻¹ and LE plus ruminai or abomasai infusion of partially hydrolysed maize starch. Starch was infused at a rate of 12.8 g • (kg BW^.75)⁻¹ •d⁻¹ approximately 20% of total metabolisable energy (ME) intake, and total volume (5 kg • site⁻¹ •d⁻¹) of infuscate was equalized across treatments and infusion sites by infusion of water. Energy balance was determined the final 7 d of each by total collection of excreta and measurements of respiratory exchange. Ruminai and abomasai starch infusion increased (P<0.01) digestible energy, ME, and retained tissue energy (TE) and nitrogen (RN) relative to LE. Digestible energy, ME, and RN were unaffected by site of starch infusion. However, shifting site of starch infusion from the rumen to the abomasum decreased energy losses from methane (P<0.01) and body heat production (P<0.15) and increased (P<0.10) TE. Partial efficiency of converting ME from ruminally and abomasally infused starch to TE were .482 and .594, respectively. These results indicate that energetic efficiency of ruminally fermented starch is 74% of that of starch digested in the small intestine.

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Energy metabolism in animals

Proceedings of the 15th symposium on energy metabolism in animals

E-Book ISBN:: 9789004683600

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 2001

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- Life Sciences
  - General
  - Animal & Veterinary

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Influence of ruminai and postruminai starch infusion on energy balance in growing steers

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Energy metabolism in animals

Proceedings of the 15th symposium on energy metabolism in animals

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