Protein and energy relations in the broiler chicken. 8. Comparison involving protein- and lysine-adequate and inadequate diets on lipid metabolism.
Chickens were fed on diets containing either 12.8 MJ, 150 g crude protein (nitrogen x 6.25)/kg or 12.8 MJ, 200 g crude protein/kg to determine differences in metabolism. The diet containing 12.8 MJ, 150 g crude protein/kg contained either 8 or 12 g lysine/kg. Treatment variables examined in vitro were lipogenesis, glucose production and hepatic enzyme activities to compare metabolism in chicks fed on a low-protein, lysine-supplemented diet and a diet formulated to contain the required amount of lysine from intact protein. Growth was similar in chicks fed on diets containing either 12.8 MJ, 154 g crude protein with 12 g lysine/kg or 12.8 MJ, 200 g crude protein/kg. Net glucose production was greater (P less than 0.05) in liver explants from chickens fed on diets containing either 12.8 MJ, 154 g crude protein with 12 g lysine/kg or 12.8 MJ, 200 g crude protein/kg than in explants from chickens fed on 12.8 MJ, 150 g crude protein with 8 g lysine/kg. Pyruvate use for glucose production was greater (P less than 0.05) in chickens fed on a diet containing 12.8 MJ, 150 g crude protein with 8 g lysine/kg. The findings from the present study suggest that crystalline and 'natural' lysine additions to chick diets may influence metabolism differently.
Rosebrough
R W
RW
Non-ruminant Animal Nutrition Laboratory, United States Department of Agriculture-Agricultural Research Service, Beltsville, MD 20705.
Mitchell
A D
AD
Von Vleck
M F
MF
Steele
N C
NC
D000818:Animals; D001219:Aspartate Aminotransferases / Q000378:metabolism; D001835:Body Weight; D002645:Chickens / Q000378:metabolism*; D004044:Dietary Proteins / Q000008:administration & dosage*; D002149:Energy Intake / Q000502:physiology*; D005943:Gluconeogenesis; D007521:Isocitrate Dehydrogenase / Q000378:metabolism; D050356:Lipid Metabolism; D008099:Liver / Q000201:enzymology; D008239:Lysine / Q000008:administration & dosage; D008291:Malate Dehydrogenase / Q000378:metabolism; D011773:Pyruvates / Q000378:metabolism
D004044:Dietary Proteins; D011773:Pyruvates; D008291:Malate Dehydrogenase; D007521:Isocitrate Dehydrogenase; D001219:Aspartate Aminotransferases; D008239:Lysine