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This study was conducted to test our hypothesis that intramuscular fat ( IMF ) accumulation increases in pigs fed on a low lysine diet during the dark period than those fed on the same diet during the light period. Using barrows aged 6 weeks, we monitored whether serum glucose and insulin levels were affected by light conditions. Two diets with different levels of lysine, 0.78% ( LL  diet) and 1.37% (control diet) were prepared. Eight pigs were fed on the diet during the light period, while the remaining pigs were fed during the dark period. The pigs were fed either the  LL  diet or the control diet. Although  IMF  contents of Longissimus dorsi ( LD ) muscle were higher in the pigs fed on a  LL  diet ( p  < .05), the light conditions had no effect. Low dietary lysine caused reduction in serum glucose levels ( p  < .05) and serum insulin levels ( p  = .0613). However, they were also unaffected by the lighting conditions. To gain further insights, we determined the messenger  RNA  levels of insulin receptor, insulin receptor substrate 1, acetyl CoA carboxylase, and fatty acid synthase in  LD  and Rhomboideus muscles and in the liver.

Effects of dietary lysine levels and lighting conditions on intramuscular fat accumulation in growing pigs