Butanediol and lipid metabolism.

Area of Science:

• Biochemistry
• Animal Nutrition
• Metabolic Studies

Background:

• 1,3-butanediol (BD) is a potential carbohydrate substitute in animal diets.
• Understanding its metabolic effects across different species is crucial for nutritional applications.

Purpose of the Study:

• To investigate the metabolic impact of dietary 1,3-butanediol (BD) in growing rats, chicks, and pigs.
• To determine the effects of BD on body weight, food efficiency, and key metabolic indicators.

Main Methods:

• Rats, chicks, and pigs were fed diets with varying levels of 1,3-butanediol (BD) replacing carbohydrate energy.
• Measurements included body weight gain, food efficiency, blood beta-hydroxybutyrate, plasma triglycerides, hepatic lactate:pyruvate ratio, hepatic long-chain acyl CoA, and fatty acid synthesis rates.

Main Results:

• BD did not affect body weight gain or food efficiency in any species.
• Blood beta-hydroxybutyrate levels increased significantly with BD intake.
• Species-specific variations were observed in plasma triglyceride responses and hepatic metabolic shifts.
• Fatty acid synthesis in rat liver was markedly reduced by BD, while hepatic fatty acid synthesis in chicks and adipose tissue synthesis in rats/pigs were unaffected.

Conclusions:

• Dietary 1,3-butanediol (BD) significantly alters hepatic metabolism, notably reducing fatty acid synthesis in rats.
• The proposed mechanism involves shifts in cytoplasmic and mitochondrial redox states, impacting substrate availability and metabolic flux.
• BD's metabolic effects are species-dependent, highlighting the need for tailored nutritional strategies.