Effect of dietary conjugated linoleic acid on body composition and energy balance in broiler chickens

Department of Nutrition, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 104 P.O. Box 80.152, 3508 TD Utrecht, The Netherlands.
British Journal Of Nutrition (Impact Factor: 3.45). 01/2008; 98(6):1152-8. DOI: 10.1017/S0007114507772677
Source: PubMed


The effect of dietary conjugated linoleic acid (CLA) on body composition and energy metabolism was investigated in broiler chickens. Male broiler chicks were assigned to receive either a control diet (1 % sunflower oil) or a diet containing CLA (1 % of a 1:1 mixture of trans-10, cis-12 and cis-9, trans-11 isomers of octadecadienoic acid). The diets were fed ad libitum for 3 weeks and there were eight replicates per diet, each replicate including four chickens so that each treatment had thirty-two animals. The proportion of body fat was lower in the control group than in the CLA group. No significant differences as to the proportions of body water, ash and protein were observed. Feed and energy intake were significantly lower in CLA-fed birds. The percentage of ingested energy lost in excreta was higher after CLA feeding and heat expenditure as a percentage of ingested energy was lower in the CLA-fed group. The CLA-fed group showed a higher percentage of SFA and lower percentages of MUFA and PUFA in carcass fat. It is concluded that CLA stimulated de novo fatty acid synthesis and lowered desaturase activity.

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    • "Zhang et al. (2007) measured increased PUFA proportion of breast muscle compared to the present study. Javadi et al. (2007) and Szymczyk et al. (2001) found a decreased PUFA proportion in the abdominal fat and muscles. "
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    ABSTRACT: The effects of dietary conjugated linoleic acid (CLA) supplementation on feed intake, growth performance, carcass composition and fatty acid composition of meat tissue were investigated in broiler chickens and Pekin ducks. A total of 108 male chickens for fattening and a total of 96 male and 96 female Pekin ducks were allocated to 3 dietary treatments (0.0, 0.1 and 0.2 % CLA) and fed for 35 or 49 days. The results showed that 0.2 % CLA supplementation in the first 3 weeks improved the daily feed intake of the broilers and the feed to gain ratio, but did not significantly influence body weight, weight and the percentage of abdominal and visceral fat as well as the intramuscular fat in breast muscles. In the duck trial, the daily feed intake was significantly higher through the first 3 weeks of male control group and male 2 g CLA group compared with the female control group. The daily weight gain of all male ducks was significantly higher compared to female ducks of all groups and was not influenced by the CLA supplementation. The feed to gain ratio of the 1 g CLA-male ducks was lowest compared to male and female control ducks and 1 and 2 g CLA female ducks. Supplementing diets with CLA modified the fatty acid composition of breast muscle. The proportion of CLA was increased in broiler meat. In duck meat, the proportions of CLA, saturated fatty acids and polyunsaturated fatty acids were increased and monounsaturated fatty acids were decreased.
    Journal für Verbraucherschutz und Lebensmittelsicherheit 03/2011; 7(1). DOI:10.1007/s00003-011-0749-5 · 0.72 Impact Factor
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    • "Du and Ahn (2002) found that feeding a diet containing 0·5% CLA to broilers at three weeks of age, for a period of three weeks, resulted in an increase in abdominal fat content. Javadi et al. (2007) reported same observation using 1% dietary CLA. It is reported that dietary CLA reduces lipogenesis in adipose tissues and mammary glands, but not in liver. "
    AFRICAN JOURNAL OF BIOTECHNOLOGY 01/2011; 10(75):17379-17384. · 0.57 Impact Factor
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