Effects of conjugated linoleic acid (cla) supplementation on milk composition, fatty acids profile and lipogenic enzymes activity in lactating rats. / Efeito da suplementação com ácido linoléico conjugado (CLA) na composição do leite, no perfil de ácidos graxos e na atividade de enzimas lipogênicas em ratas lactantes.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

CLA has a range of biological properties, including effects on lipid metabolism, milk and body composition in animals. This study investigated the effects of dietary CLA on lactating rats and development of the suckling rats. Dams were fed either with a control diet or a diet supplemented with 2.5% of calcium salts of CLA containing 60% of CLA (CLA-60, Church &Dwight, Princeton, NJ) from parturition to the 15 th day post-partum. The CLA-60 contained different isomers of CLA (24% cis/trans 9,11, 35% cis/trans 10,12, 15% cis/trans 8,10, 17% trans/trans 11,13 and 9% others). Treatment reduced milk fat content by 33% (P<0.05). The fatty acid profile of milk suggest CLA effects were more pronounced on de novo synthesis. In accordance with that, the activities of fatty acid synthase (FAS), glucose 6-phosphate dehydrogenase (G6PDH) and 6-phophogluconate dehydrogenase (6PGDH) were reduced by CLA treatment in the mammary gland and liver. In contrast, the activity of NADP-malate dehydrogenase was unaffected. The CLA supplementation of the dams induced a significant reduction on the pups growth. Overall, feeding a diet supplemented with CLA to lactating rats for 15 days of lactation resulted in a marked reduction in milk fat content and in a shift in milk fatty acid composition. The data demonstrated that while inhibiting milk fat synthesis, CLA decreased activities of enzymes involved on de novo fatty acid synthesis.

ASSUNTO(S)

enzimas composição corporal metabolismo animal. body composition ácido linoléico linoleic acid animal metabolism. enzymes

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