title: Fatty acid profile of hair lambs and their crossbreds slaughtered at different weights.
abstract: This study aims to investigate the effect of breed and slaughter weight on fatty the acid profile of the Longissimus dorsi muscle in lambs. Twenty-four Santa Inês (SI), 24.5 Ile de France × 0.5 Santa Inês (Ile × SI) and 12.5 Texel × 0.5 Santa Inês (Te × SI), slaughtered at different weights (30, 35, 40, and 45 kg), were evaluated. The animals were reared with creep feeding to weaning and were feedlot finished, receiving a diet composed of 30% hay and 70% concentrate. The analyses of fatty acids were carried out on the Longissimus muscle of the 13th rib. The experiment was in a three by four factorial design. The total mean saturated fatty acid level was 44.88%, with 43.30% monounsaturated fats and 1.72% polyunsaturated. The major fatty acids found included oleic (43%), palmitic (22%), and stearic (18%). The concentration of desirable fatty acids varied from 61.56% to 66.78%, with Te × SI (66.78%) having the highest levels (P < 0.05). The slaughter weight affected (P < 0.05) the saturated and unsaturated (both mono and poly) fatty acid profiles. The 35-kg slaughter weight showed the most desirable fatty acid profile. The saturated myristic and stearic fatty acids decreased with an increase in the slaughter weight, but oleic acid increased. In the conditions of the present study, the meat from Santa Ines and Texel × Santa Ines lambs had fatty acid profiles more beneficial for human health due to the higher levels of unsaturated fatty acids.
authors: Escola de Veterinária, Universidade Federal de Goiás, Goiânia, Goiás, Brazil. alinelandim@yahoo.com.br
authors: Aline Vieira
authors: AV
authors: Landim
authors: Maximiliano Tadeu Memória
authors: MT
authors: Cardoso
authors: Marlos
authors: M
authors: Castanheira
authors: Maria Clorinda Soares
authors: MC
authors: Fioravanti
authors: Helder
authors: H
authors: Louvandini
authors: Concepta
authors: C
authors: McManus
mesh_terms: D000818:Animals; D001823:Body Composition; D001835:Body Weight; D001938:Brazil; D004032:Diet; D005227:Fatty Acids / Q000032:analysis*; D005231:Fatty Acids, Unsaturated / Q000032:analysis; D006824:Hybridization, Genetic; D008460:Meat / Q000032:analysis / Q000592:standards*; D018482:Muscle, Skeletal / Q000737:chemistry; D011897:Random Allocation; D034561:Sheep, Domestic / Q000254:growth & development* / Q000378:metabolism
chemical_list: D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated