Background: Branched chain amino acids (BCAAs) are important substrates for milk protein synthesis in the mammary gland, and are tightly related to lipid metabolism. No study has been performed examining the role of BCAAs with high fat diets on milk fat synthesis. This study was designed to investigate the effect of dietary BCAAs on growth performance of piglets, progeny body weight, and milk fat composition in sows fed a high fat diet. Four diets (CON = control diet; HF = high fat diet with 8% soybean oil; HF-MB=HF plus 0.39% BCAAs; HF-HB=HF plus 0.78% BCAAs) were fed to sows from late gestation to weaning. Results: Compared to HF, BCAAs (HF-MB and HF-HB) increased the litter weight (P < 0.05) and overall litter weight gain (P < 0.05) at weaning and increased colostrum fat content by 27.3-35.8% (P < 0.01). Fatty acid profiles between the two doses of BCAAs were similar. Compared with HF, HF-MB tended to decrease the percentage of C18:3n3 (P = 0.063) and increased the percentage of C18:1n9c (P = 0.03). In addition, BCAAs in HF-MB increased the concentration of total fatty acid by 22.1% in colostrum (P = 0.03) but decreased that in serum at parturition by 53.2% (P = 0.027). The fatty acids in colostrum that increased with BCAAs were C15:
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