Elsevier

The Journal of Nutrition

Volume 129, Issue 11, November 1999, Pages 2037-2042
The Journal of Nutrition

Dietary Conjugated Linoleic Acids Increase Lean Tissue and Decrease Fat Deposition in Growing Pigs12

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Abstract

Conjugated linoleic acids (CLA) decrease the body fat content of rodents; the aim of this study was to determine whether dietary CLA altered carcass composition of pigs. Female Large White x Landrace pigs (n = 66) were used in this study. To obtain initial body composition, six pigs were slaughtered at 57 kg live weight, whereas the remaining pigs were allocated to one of six dietary treatments (0, 1.25, 2.5, 5.0, 7.5 and 10.0 g/kg CLA, containing 55% of CLA isomers). The diets, containing 14.3 MJ digestible energy (DE) and 9.3 g available lysine per kg, were fed ad libitum for 8 wk. Dietary CLA had no significant effect on average daily gain (861 vs. 911 g/d for pigs fed diets with and without CLA, P = 0.15) or feed intake (2.83 vs. 2.80 kg/d, P = 0.74). The gain to feed ratio was increased by dietary CLA by 6.3% (0.328 vs. 0.348, P = 0.009). Fat deposition decreased linearly (−8.2 ± 2.09 g/d for each gram per kilogram increase in CLA concentration; P < 0.001) with increasing inclusion of CLA. At the highest level of CLA inclusion, fat deposition was decreased by 88 g/d (−31%). Similarly, the ratio of fat to lean tissue deposition decreased linearly (−0.093 ± 0.0216 for each gram per kilogram increase in CLA concentration; P < 0.001) with increasing dietary CLA. The carcass lean tissue deposition response to dietary CLA was quadratic in nature and was maximized (+25%) at 5.0 g/kg dietary CLA. Overall, dietary CLA increased the gain to feed ratio and lean tissue deposition and decreased fat deposition in finisher pigs.

pigs
conjugated linoleic acid
body composition
lipid deposition
growth

Cited by (0)

1

Presented in part in abstract form at the 1998 American Society of Animal Science meeting [Dunshea, F. R., Ostrowska, E., Muralitharan, M., Cross, R., Bauman, D. E., Pariza, M. W. & Skarie, C. (1998) Dietary conjugated linoleic acid decreases backfat in growing gilts. J. Anim. Sci. 76 (suppl. 1):131] and the 1998 Nutrition Society of Australia meeting [Ostrowska, E., Muralitharan, M., Cross, R. F., Bauman, D. E. & Dunshea, F. R. (1998) Dietary conjugated linoleic acid decreases fat deposition in growing pigs. Proc. Nutr. Soc. Aust. 22:171].

2

Supported by Pig Research and Development Corporation.

3

Recipient of a Swinburne University of Technology postgraduate award.