RABIA et al.[55] conducted a study for the determination of the effects of L-carnitine supplementation (50, 100 or 500mg/kg diet) on 65-week-old hens kept in cages. Dietary L-carnitine supplementation did not affect the laying performance (egg production rate, mean egg weight, daily feed intake, egg mass and feed conversion) or external egg quality but modified the egg composition. Albumen quality (relative albumen weight) was improved, in supplemented hens, probably because of a higher metabolic rate in the magnum and/or a higher activity of the shell gland. The increase of albumen could be beneficial for the nutritional point of view and also for improving storage time. Yolk index and yolk colour score did not significantly vary, whereas absolute or
relative yolk weights were significantly lowered. L-carnitine has probably induced reduction of hepatic biosynthesis of yolk precursors, or an alteration of their transport from the liver to the ovarian follicle and the oocyte.
RABIA et al.[55] conducted a study for the determination of the effects of L-carnitine supplementation (50, 100 or 500mg/kg diet) on 65-week-old hens kept in cages. Dietary L-carnitine supplementation did not affect the laying performance (egg production rate, mean egg weight, daily feed intake, egg mass and feed conversion) or external egg quality but modified the egg composition. Albumen quality (relative albumen weight) was improved, in supplemented hens, probably because of a higher metabolic rate in the magnum and/or a higher activity of the shell gland. The increase of albumen could be beneficial for the nutritional point of view and also for improving storage time. Yolk index and yolk colour score did not significantly vary, whereas absolute orrelative yolk weights were significantly lowered. L-carnitine has probably induced reduction of hepatic biosynthesis of yolk precursors, or an alteration of their transport from the liver to the ovarian follicle and the oocyte.
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