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


     

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 Similar articles in PubMed
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 von Keyserlingk, G. E.
Right arrow Articles by Mathison, G. W.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by von Keyserlingk, G. E.
Right arrow Articles by Mathison, G. W.

Journal of Animal Science, Vol 71, Issue 8 2206-2217, Copyright © 1993 by American Society of Animal Science

JOURNAL ARTICLE

The effect of ruminal escape protein and ambient temperature on the efficiency of utilization of metabolizable energy by lambs

G. E. von Keyserlingk and G. W. Mathison
Department of Animal Science, University of Alberta, Edmonton, Canada.

Forty-eight crossbred lambs (22.5 +/- 2.6 kg average BW) of equal numbers from both sexes were used to observe the effect of protein supplement (none, canola meal, or fish meal) and temperature (21 +/- 1.8 degrees C or 4.7 +/- 1.7 degrees C) on growth and energetic efficiency in a 2 x 3 x 2 factorial experiment. Twelve lambs were slaughtered at the onset of the trial to determine initial body composition. The remaining 36 were fed diets consisting of 50% concentrate and 50% straw at DMI of 77 and 83 g/kg.75 daily in the warm and cold, respectively, for an 85-d period. Daily gains of the control lambs and of those supplemented with canola and fish meal were 80, 94, and 101 g/d, respectively; however, no differences in efficiency of live weight gain could be detected. Apparent digestibilities of DM, GE, OM, and fiber were decreased (P < .05) in response to the cold. Methane production was increased (P < .01) in the cold. Metabolizable energy intake was not increased by exposure to cold, even though DMI was higher (P < .1) in the cold. Cold-treated lambs retained less (P < .01) total energy as well as less (P = .02) fat energy as determined by comparative slaughter. Supplementation with protein increased (P < .05) energy retained as protein; however, it did not affect total energy retained or energetic efficiency. Energy retention estimated from the calorimetry-balance technique was 30 to 80% greater than that estimated from the comparative slaughter technique. It was concluded that methane production in lambs with short fleece was increased when the temperature was reduced from 21 to 5 degrees C and that energetic efficiency was not affected by the concentration or type of protein in the diet.




HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1993 by the American Society of Animal Science.