J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1976. 42:724-735.
© 1976 American Society of Animal Science
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 Jahn, E.
Right arrow Articles by Chandler, P. T.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Jahn, E.
Right arrow Articles by Chandler, P. T.

Performance and Nutrient Requirements of Calves Fed Varying Percentages of Protein and Fiber1

E. Jahn2 and P. T. Chandler

Virginia Polytechnic Institute and State University3, Blacksburg 24061

Abstract

Four protein (CP) (9.0, 11.5, 14.5 and 17.5%) and three acid detergent fiber (ADF) (11, 18 and 25%) percentages were evaluated in a complete factorial experiment. Five calves were randomly assigned to an experimental ration at 8 weeks of age and fed ad libitum during two consecutive 6-week periods. Live weights and feed intakes were determined weekly. Significant protein x fiber interaction for body gains, corrected for digestive fill, indicated that response to added protein depended on the amount of ration fiber. Protein intakes for maximum live weight gains for 11, 18 and 25% ADF were .47, .66 and .58 kg and produced gains of .97, .91 and .76 kg/day. Dry matter intake increased at all fiber percentages as protein increased from 9 to 14.5% and decreased as protein was further elevated in 11 and 25% ADF diets. Serum urea did not increase, when protein was raised from 9 to 11.5%, but increased sharply as ration protein was elevated above 11.5%. For a corrected body weight gain of .60 kg/day (corrected for digestive tract contents), protein requirements were 271, 318, and 407 g/day for 11, 18 and 25% ADF rations. Net energy gain requirements did not change with varying protein and were determined as .52, .96, 1.32 and 1.61 Mcal/day for corrected body weight gains of .2, .4, .6 and .8 kg/day for the 100 kg live weight calf.

Footnotes

1 Published with the approval of the director of the Division and Animal and Veterinary Science, Virginia Polytechnic Institute and State University, Blacksburg.

2 Present address: Animal Science Research, Merck and Co., Inc., Rahway, NJ 07065.

3 Department of Dairy Science.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1976 by the American Society of Animal Science.