JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 47 No. 12 1352-1358
© 1964 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Yadava, I. S.
Right arrow Articles by Bartley, E. E.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Yadava, I. S.
Right arrow Articles by Bartley, E. E.

Interrelationships of Rumen Ingesta Composition, Removal Rate from the Rumen, and Digestibility in Identical Twin Cows Fed Alfalfa Hay1

I. S. Yadava2 and E. E. Bartley

Department of Dairy Science, Kansas State University, Manhattan

ABSTRACT

Four sets of fistulated, identical-twin cows were used to determine the relationship between the rate of removal of nutrients from the rumen and nutrient digestibility. The cows were fed alfalfa hay at 12-hr intervals. The day after each digestion trial the rumen was emptied and the contents weighed, sampled, and returned to the rumen three times: before the cows were fed and 6 and 12 hr after they were fed. Except for rumen dry matter, which increased in amount 6 hr after feeding, there was little change in the composition of rumen ingesta from sample to sample when sampled three times in 12 hr. The percentages of crude fiber and ash in rumen ingesta were greater than, and the percentages of protein and nitrogen-free extract were less than, the percentages of these constituents in the hay fed. The ratio of nutrients fed to those present in the rumen before the cows were fed is an indication of rate nutrients are removed from the rumen. On the average, an amount of dry matter (13.2 lb) equivalent to approximately twice the intake (7.75 lb) was present in the rumen before hay was fed.

A small variation was observed within twin pairs and between twin pairs in digestibility; a large variation within and between twin pairs in nutrient removal rate from the rumen. Consequently, no correlation was shown among individual animals between rate of removal and digestibility. Within individual animals, the most digestible nutrient was removed from the rumen fastest.

FOOTNOTES

1 Contribution no. 329, Department of Dairy Science, Kansas Agricultural Experiment Station, Manhattan, Kansas.

2 Present address: Animal Nutrition Section, Punjab College of Veterinary and Animal Sciences, Hissar, India.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1964 by the American Dairy Science Association ®.