Author
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Mitchell, Alva |
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SCHOLZ, A. - HUMBOLDT UNIV. GERMANY |
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Submitted to: Energy Metabolism of Farm Animals Symposium Proceedings
Publication Type: Proceedings Publication Acceptance Date: 4/11/1997 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: Dual energy x-ray absorptiometry (DXA) was used for in vivo assessment of body composition and energy deposition in pigs that were either homozygous stress non-sensitive, heterozygous or homozygous stress sensitive. DXA evaluation of pigs at 30 kg revealed no differences among genotypes with respect to total body fat content, however, it was estimated that the nn pigs contained more protein than either the Nn or NN pigs. During growth from 30 to 60 kg, the nn pigs deposited less fat than the NN pigs, while Nn were intermediate. This pattern continued during growth from 60 to 90 kg, resulting in the nn pigs having less fat and less total energy than the other two genotypes. There were no differences in protein deposition during these periods. A summary of the DXA evaluation of the energy status of the three genotypes at the three body weights is shown below. Based on this data and measurements of energy intake during these periods, there were no differences among genotypes in the efficiency with which dietary energy was retained. Thus, DXA scans of live pigs permitted evaluation of incremental changes in body composition and energy status of different ryanodine receptor genotypes as the pigs grew from 30 to 90 kg; with the conclusion being that differences in total body energy content were the of genotypic differences in fat deposition. |
