QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Canolty, N. L. Articles by Koong, L. J. Search for Related Content PubMed PubMed Citation Articles by Canolty, N. L. Articles by Koong, L. J.

Utilization of Energy for Maintenance and for Fat and Lean Gains by Mice Selected for Rapid Postweaning Growth Rate¹

Department of Nutrition and Department of Animal Science, University of California, Davis, California 95616

The metabolizable energy intake (MEI) required for maintenance and the efficiency of utilization of metabolizable energy available for gain (MEA) were determined for a line of mice (rapid growth) selected for 41 generations for rapid postweaning weight gain and for a contemporarily mated line (control) that had been randomly selected. Feed intake of individually housed rapid growth and control males was restricted above maintenance or was ad libitum from 21 to 42 days of age. Regressions of change in body energy per unit metabolic body size on MEI per unit metabolic body size showed that the maintenance requirement for each line of mice was 176 kcal per unit metabolic body size per day and that the rapid growth line was more efficient than the control line in utilizing MEA (50% vs. 23%) to promote an increase in body energy. Although the proportions of MEA used for fat (PF) and lean (PL) gains and the net efficiencies with which those proportions were utilized for fat (NF) and lean (NL) gains were unknown, the products of proportion and efficiency for fat gain (PF x NF or fat energy deposition coefficient) and for lean gain (PL x NL or lean energy deposition coefficient) were determined. The results demonstrate that 41 generations of selection for rapid postweaning weight gain did not change the lean energy deposition coefficient, but did alter the fat energy deposition coefficient. These data suggest that the two lines of mice use different proportions of MEA for fat gain and/or utilize MEA for fat gain at different efficiencies.

KEY WORDS: • energy utilization • maintenance requirement • net efficiency • fat energy gain • lean energy gain • fat energy deposition coefficient • lean energy deposition coefficient

¹ This work was reported at the 60th Annual Meeting of the Federation of American Societies for Experimental Biology in Anahelm. California. An abstract is published in Federation Proceedings, 35, 402, 1976.

Manuscript received 28 January 1976.

This article has been cited by other articles:

				D. L. Eggert and M. K. Nielsen Comparison of feed energy costs of maintenance, lean deposition, and fat deposition in three lines of mice selected for heat loss J Anim Sci, February 1, 2006; 84(2): 276 - 282. [Abstract] [Full Text] [PDF]