title: Lipid composition of muscle and adipose tissue from crossbred ram, wether and cryptorchid lambs.
abstract: Lambs from rams (R), cryptorchids (C) and wethers (W) were examined to compare with the dietary guidelines for humans on fat and cholesterol intake. Twenty-four lambs were assigned to treatments as R, C or W at weaning (60 d). Each lamb had ad libitum access to a 77:23% forage:concentrate diet containing 11.7% crude protein and 1.84 Mcal ME/kg. The experiment was terminated when the lambs reached 50 kg body weight. Lipid composition of the longissimus muscle (LM) and s.c. adipose tissue was determined by gas-liquid chromatography. Rams has less (P less than .01) s.c. fat (cm) and i.m. lipid (%) (.26 cm; 3.*%) than W (.56 cm; 4.9%). Total polyunsaturated fatty acids were greater (P less than .01) in the LM of R (7.06%) than in LM of W (5.21%). Rams had higher percentages of C18:2, C18:3, C20:4 and C18:1 in their LM than W did. On the basis of a 100-g serving of LM, R had 1.73, C had 2.15 and W had 2.21 g saturated fatty acids. There were no (P less than .01) differences among sex types for cholesterol content of LM, which averaged 66.6 mg/100 g wet tissue. The only major difference of the s.c. fat lipid composition was in saturated fatty acids. Wethers had higher (P less than .01) saturated fatty acids (51.4%) than C 46.8%) and R (43.3%). Based on the lipid composition of these three types of lambs, the LM muscle from young R lambs approached dietary fat guidelines for humans more closely than did that from castrates.
authors.affiliation: U.S. Department of Agriculture, Beltsville, MD 20705.
authors.forename: M B
authors.initials: MB
authors.lastname: Solomon
authors.forename: G P
authors.initials: GP
authors.lastname: Lynch
authors.forename: K
authors.initials: K
authors.lastname: Ono
authors.forename: E
authors.initials: E
authors.lastname: Paroczay
mesh_terms: D000273:Adipose Tissue / Q000032:analysis*; D000818:Animals; D002784:Cholesterol / Q000032:analysis; D003456:Cryptorchidism / Q000378:metabolism / Q000662:veterinary; D005227:Fatty Acids / Q000032:analysis; D008055:Lipids / Q000032:analysis*; D008297:Male; D009132:Muscles / Q000032:analysis*; D012756:Sheep / Q000378:metabolism*; D012757:Sheep Diseases / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D008055:Lipids; D002784:Cholesterol