The influence of fat mobilizing substance and dietary linoleic acid on blood plasma fatty acid composition and linoleic acid metabolism in the laying hen

Balnave, D.

International Journal of Biochemistry 6(12): 911-918

1975


ISSN/ISBN: 0020-711X
DOI: 10.1016/0020-711x(75)90012-9
Accession: 000543411

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Abstract
Five-week old female chicks were given 5 times by the pectoralis muscle 2 mg of fat-mobilizing substance (FMS) obtained from adult cockerels, while controls were given sodium carbonate injection. Injections were given on alternate days. There was no difference between the 2 groups in liver weight and lipid content or in liver ATP citrate lyase, NADP-malate dehydrogenase or NADP-isocitrate dehydrogenase.Mature laying hens were given a linoleic acid-deficient diet, containing only 3 g/kg, and were starved, given 3 times by mouth 3 mg FMS over a period of 9 days, and later, daily injections of 4 mg FMS. In a third experiment they were given FMS isolated from pig urine. Some had FMS prepared from urine collected on the first day of fasting, some had FMS prepared from urine on the second day of fasting. Changes were produced in plasma fatty acid values both by fasting and by FMS, but the changes were not parallel. Changes in egg fatty acid composition were not seen. Feeding supplementary linoleic acid increased hen egg weight. There was some difference in behaviour between porcine and avian FMS, and between FMS obtained on the first and on the second day of fasting.