J. Anim Sci.
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J. Anim Sci. 1979. 48:810-822.
© 1979 American Society of Animal Science
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Effects of Pregnancy and Mating Age on Protein and Fat Deposition in Polygenic Obese Mice1,2,

E. J. Eisen3 and J. M. Leatherwood3

North Carolina State University, Raleigh 27650

Abstract

Effects of pregnancy and mating age on rate (gain/day) and efficiency (gain/feed) of lean and fat deposition were determined in the M16 line of mice selected for rapid postweaning weight gain. Correlated responses in M16 mice included increased lean and fat gain and efficiency. Exclusive of their litters, M16 females had greater (P<.01) lean tissue growth and efficiency during pregnancy than M16 virgin female contemporaries. Gain and efficiency of lean during pregnancy were higher (P<.01) in females mated at an early age (28.7 ± .5 days) than those mated at a normally later age (52.7 ± .5 days). Pregnant females had decreased (P<.01) fat and energy retention and efficiency when compared with virgin controls of similar age. Early-pregnant females gained body fat and energy during pregnancy, whereas normal-pregnant females showed a loss of body fat and energy. Total (female + litter) gain and efficiency of lean, fat and energy were higher (P<.01) in early-pregnant than normal-pregnant females. Total lean gain and efficiency were higher (P<.01) in gestating than virgin controls, but total fat and energy gain and efficiency were less (P<.01). During a 3-week postpartum test period, early-pregnant females did not differ from virgin controls in lean gain and efficiency, whereas normal-pregnant females were lower (P<.01) than virgin controls. Early-pregnant and normal-pregnant females had higher (P7#x00C;.01) fat and energy gain and efficiency than virgins during the 3-week postpartum period.

Footnotes

1 Paper No. 5725 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Experiment Station of the products named nor criticism of similar ones not mentioned.

2 The authors acknowledge the excellent technical assistance of Ms. Billie Jean Edwards and Ms. Kathleen M. Weller.

3 Department of Animal Science.






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Copyright © 1979 by the American Society of Animal Science.