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Effects of warm exposure on adipose tissue and muscle metabolism in growing pigs

Effects of warm exposure on adipose tissue and muscle metabolism in growing pigs

Comparative Biochemistry & Physiology A 100(4): 995-1002

Forty-eight pigs weaned at 3 weeks old and acclimated to the experimental temperatures for 2 weeks before the start of the experiment, were fed ad lib and used between 9 and 33 kg live weight to determine the effects of warm exposure (31.5 vs on adipose tissue and muscle metabolism. Warm exposure induced a decline in the lipid content (P < 0.01) of backfat whereas degree of saturation (P < 0.05) and adipocytes size were increased (P < 0.05). At, as compared to, activities of malic enzyme and glucose-6-phosphate dehydrogenase were depressed by an average 33% in backfat (P < 0.01) and 23% in leaf fat (P < 0.05) while lipoprotein-lipase activity was stimulated by 60% (P < 0.01) in leaf fat. In warm conditions, the activities of the enzymes indicative of oxidative and glycolytic metabolism in muscle, i.e., lactate dehydrogenase, .beta.-hydroxyacyl coenzyme-A dehydrogenase, citrate synthase and cytochrome oxidase, were reduced in the longissimus dorsi muscle (P < 0.05) and to a lesser extent in the trapezius muscle. At, pigs exhibit lower average plasma levels of insulin, T3 and T4 than those maintained at

Accession: 002367144

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PMID: 1685395

DOI: 10.1016/0300-9629(91)90327-9

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