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Title: DUAL-ENERGY X-RAY ABSORPTIOMETRY (DXA) ANALYSIS OF GROWTH AND COMPOSITION OF PIGS OF DIFFERENT RYANODINE RECEPTOR GENOTYPES

Author
item Mitchell, Alva
item SCHOLZ, ARMIN - BERLIN UNIVERSITY

Submitted to: Archives of Animal Breeding
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/6/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: Carcass data has shown that stress susceptible pigs have less fat and more lean than do non-stress susceptible pigs. Dual energy x-ray absorptiometry (DXA) was used to evaluate live body composition of non-stress susceptible, carrier and stress susceptible pigs. DXA measurements of percent fat and lean revealed no differences among genotypes for the 10 kg pigs. However, at 30, 60 and 90 kg, non-stress susceptible pigs were observed to have more fat and less lean than the susceptible pigs while the carrier pigs were intermediate with respect to both fat and lean percentages. There were no differences in the DXA measurements of bone mineral content among the three groups for any weight group. Calculations of fat and lean growth, based on DXA measurements for the period of growth from 30 to 90 kg live weight, revealed that differences in body composition were the result of differences in fat growth, but not accompanied by differences in lean growth.

Technical Abstract: Dual energy x-ray absorptiometry (DXA) was used to evaluate live body composition of homozygous stress nonsensitive (NN, 27 pigs), heterozygous (Nn, 28 pigs) and homozygous stress sensitive pigs (nn, 18 pigs). The pigs were anesthetized and scanned by DXA at 10, 30, 60 and 90 kg live body weight. From each weight group, pigs were slaughtered (10 kg, 22 pigs; 30 kg, 19 pigs; 60 kg, 15 pigs; and 90 kg, 17 pigs) and carcass composition determined by chemical analysis. DXA measurements of percent fat and lean revealed no differences among genotypes for the 10 kg pigs. At 30, 60 and 90 kg, NN pigs were observed to have more fat and less lean (P<0.05) than the nn pigs while the Nn pigs were intermediate with respect to both fat and lean percentages. There were no differences in the DXA measurements of bone mineral content among genotypes for any weight group. Calculations of fat and lean growth, based on DXA measurements for the period of growth from 30 to 90 kg live weight, revealed that differences in body composition were the result of differences in fat growth (more in the NN pigs followed by the Nn and nn pigs), but not accompanied by differences in lean growth.