early gestation, fatty acids,fetal development, liver, offspring, omega-3
Ewe early gestation supplementation with eicosapentaenoic and docosahexaenoic acids affects the liver, muscle, and adipose tissue fatty acid profile and liver mRNA expression in the offspring
Our objectives were to assess the effects of eicosapentaenoic (EPA) and docosahexaenoic acids (DHA) supplementation to pregnant ewes during the first third of gestation on their offspring\%27s liver, adipose, and muscle tissues fatty acid (FA) profile and liver mRNA expression after a finishing period receiving diets with different FA profiles. Twenty-four post-weaning lambs, blocked by sex and body weight, were used in a 2 x 2 factorial arrangement of treatments. The first factor was dam supplementation (DS) in the first third of gestation with 1.61%25 of Ca salts of palm fatty acid distillate (PFAD) or Ca salts enriched with EPA-DHA. Ewes were exposed to rams with marking paint harnesses during the breeding. Ewes started DS at the day of mating, considered day 1 of conception. Twenty-eight days after mating, ultrasonography was used to confirm pregnancy, and nonpregnant ewes were removed from the groups. After weaning, the offspring lambs were supplemented (LS, second main factor) with two different FA sources (1.48%25 of PFAD or 1.48%25 of EPA-DHA) during the growing and fattening phase. Lambs were fed the LS diet for 56 d and sent to slaughter, where the liver, muscle, and adipose tissue samples were collected for FA analysis. Liver samples were collected for relative mRNA expression for genes associated with FA transport and metabolism. The data were analyzed as a mixed model in SAS (9.4). In the liver, the amount of C20:5 and C22:6 (P < 0.01) increased in lambs with LS-EPA-DHA, while some C18:1 cis FA isomers were greater in the lambs from DS-PFAD. In muscle, amounts of C22:1, C20:5, and C22:5 increased (P < 0.05) in lambs born from DS-EPA-DHA. The adipose tissue amounts of C20:5, C22:5, and C22:6 were greater (P < 0.01) in lambs from LS-EPA-DHA. Interactions (DS x LS; P < 0.05) were observed for DNMT3 beta, FABP-1, FABP-5, SCD, and SREBP-1; having greater mRNA expression in liver tissue of LS-EPA-DHA, DS-PFAD and LS-PFAD, DS-EPA-DHA lambs compared with the lambs in the other two treatments. Liver ELOVL2 mRNA relative expression (P < 0.03) was greater in the offspring of DS-PFAD. Relative mRNA expression (P < 0.05) of GLUT1, IGF-1, LPL, and PPAR gamma increased in the liver from LS-EPA-DHA lambs. Dam supplementation during early gestation using with different FA sources changed the lipid FA profile in MT, LT, and SAT during the finishing period depending on the tissue and type of FA source administered during the growing phase. Lay Summary Previous research has identified that polyunsaturated fatty acids take part in many health benefits, including fetal development during pregnancy. Also, other types of fatty acids, such as monounsaturated, have been linked to reduction of cardiovascular disease. Our study aimed to assess the effect of supplementation with different types of fatty acids, offered at 1.61%25 of the feed intake (as calcium salts of fatty acids), during the first 50 d of pregnancy in ewes and later continue the fatty acids supplementation during the growing phase of the offspring (at 1.48%25 of the feed intake). The proportions of different fatty acids were evaluated in the lambs\%27 liver, muscle, and adipose tissue. Also, the mRNA expression of genes involved in fatty acid metabolism was analyzed in the lambs\%27 liver. Our study demonstrated that depending on the type of fatty acids (polyunsaturated vs. monounsaturated) during early gestation, the profile of fatty acids changes in the different tissues evaluated. Also, fatty acid supplementation during early gestation modifies the expression of mRNA of genes involved in fat metabolism in the liver in the mature offspring.
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