Effect of site and source of energy supplementation on milk yield in dairy cows

A. Arieli*, S. Abramson, S. J. Mabjeesh, S. Zamwel, I. Bruckental

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The effect of infusing similar energy equivalents of starch into the rumen, or starch or oil into the abomasum was studied in four midlactation cows in a 4 × 4 Latin square design experiment; controls were ruminally infused with water. Cows were fitted with cannulas in the rumen, abomasum, and ileum, and nutrient digestion in the rumen and small intestine was evaluated with Cr as a digesta marker. Ruminai infusions of starch, or abomasal infusions of starch or oil, were associated with a decrease in voluntary feed organic matter intake. Overall energy intake was reduced in oil-infused, but not in starch-infused cows. Nonstructural carbohydrate digestibility in the rumen and in the small intestine was similar among treatments. In abomasally infused cows 3.4 kg/d of nonstructural carbohydrates was apparently digested in the small intestine. Milk production was reduced in oil-infused cows, but the efficiency of milk energy and protein yield was unaffected by treatments. Plasma glucose, insulin, and IGF-1 concentration, mammary glucose extraction rate, rumen ammonia and plasma urea, and arterial and mammary extraction rate of amino acids were all similar among treatments. Large quantities of starch can be digested in the rumen or small intestine of dairy cows. There appear to be no metabolic advantage to increasing the supply of starch to the rumen or the abomasum of mid-lactation dairy cows maintained on highly concentrated diets and exhibiting a positive energy balance.

Original languageAmerican English
Pages (from-to)462-470
Number of pages9
JournalJournal of Dairy Science
Issue number2
StatePublished - Feb 2001

Bibliographical note

Funding Information:
This research was support by a grant from the United States-Israel, Binational Agriculture Research and Development Fund (BARD), No. US-2642-95.


  • Milk yield
  • Small intestine
  • Starch digestibility


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