Lipid composition of carcass tissue from transgenic pigs expressing a bovine growth hormone gene.
Fatty acid profiles and cholesterol content of whole-carcass ground tissue were compared from 26 transgenic (T) pigs expressing a bovine growth hormone gene (bGH) to 26 sibling control (C) pigs. All pigs were fed a common diet and were slaughtered at five different live weights: 14, 28, 48, 68, and 92 kg. The left side of each intact carcass was ground and tissue samples were analyzed for lipid composition and cholesterol content. At 14-kg body weight, carcasses from bGH-T pigs contained 38% less fat, 44% less saturated fatty acids (SFA), 48% less monounsaturated fatty acids (MUFA), and 38% less polyunsaturated fatty acids (PUFA) than C pigs. At 28 kg, bGH-T pigs had 38% less total carcass fat, 42% less SFA, 46% less MUFA, and 24% less PUFA than C pigs. At 48-kg body weight, bGH-T pigs contained 48% less carcass fat, 55% less SFA, 59% less MUFA, and 22% less PUFA than C pigs. At 68 kg, bGH-T pigs had 78% less carcass fat, 78% less SFA, 79% less MUFA, and 53% less PUFA than C pigs. At 92 kg, carcasses from bGH-T pigs contained 85% less carcass fat, 85% less SFA, 91% less MUFA, and 66% less PUFA than those from C pigs. Cholesterol content was not different between bGH-T pigs and C pigs at any of the carcass weights. The trend was for cholesterol content to decrease from the 14- to 92-kg weight group. These results suggest a dilution effect of carcass fat and fatty acids in carcass tissue from bGH-T pigs with increasing live weight.
Solomon
M B
MB
Meat Science Research Laboratory, PQDI, Beltsville, MD.
Pursel
V G
VG
Paroczay
E W
EW
Bolt
D J
DJ
D000273:Adipose Tissue / Q000254:growth & development; D000818:Animals; D030801:Animals, Genetically Modified / Q000235:genetics* / Q000254:growth & development; D001823:Body Composition / Q000235:genetics; D002417:Cattle; D002784:Cholesterol / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis; D005786:Gene Expression Regulation; D013006:Growth Hormone / Q000096:biosynthesis / Q000235:genetics*; D008055:Lipids / Q000032:analysis*; D008460:Meat / Q000032:analysis*; D024510:Muscle Development; D013552:Swine / Q000235:genetics* / Q000254:growth & development; D015430:Weight Gain / Q000235:genetics
D005227:Fatty Acids; D008055:Lipids; D013006:Growth Hormone; D002784:Cholesterol