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Nutrition-induced differences in body composition, compensatory growth and endocrine status in growing pigs*,**

Published online by Cambridge University Press:  20 November 2008

H. R. Martínez-Ramírez ,
E. A. Jeaurond  and
C. F. M. de Lange
H. R. Martínez-Ramírez
Affiliation:
Centre for Nutritional Modeling, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
E. A. Jeaurond
Affiliation:
Centre for Nutritional Modeling, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
C. F. M. de Lange*
Affiliation:
Centre for Nutritional Modeling, Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada N1G 2W1
*
E-mail: [email protected]
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Abstract

In this experiment, we assessed the effect of amino acid (AA) intake restriction in entire male Yorkshire pigs between 15 and 38 kg BW (restriction phase) on BW gain, body composition and plasma levels of blood urea nitrogen (BUN), cortisol, insulin-like growth factor I (IGF-I), growth hormone (GH) and leptin during the subsequent re-alimentation phase. During the restriction phase, 36 pigs were allotted to one of two dietary treatments: adequate AA intake (control) or AA-limiting diets (AA-30%). Thereafter, pigs were fed common non-limiting diets up to 110 kg BW. Throughout the experiment, pigs were scale-fed at 90% of the estimated voluntary daily digestible energy intake. At the end of the restriction phase, pigs on AA-30% had lesser BW gain (650 v. 784 g/day; P < 0.001), loin area (LA; 12.2 v. 14.2 cm2; P < 0.001), BUN (4.6 v. 6.3 mg/dl; P < 0.02), lesser plasma levels of IGF-I (440 v. 640 ng/m; P < 0.001) and cortisol (8.2 v. 19.2 μg/dl; P < 0.001), greater backfat thickness (BF; 7.56 v. 6.56 mm; P < 0.02), and greater plasma levels of leptin (2.7 v. 1.8 ng/ml; P = 0.027) and GH (3.3 v. 2.0 ng/ml; P = 0.05) than pigs on control. During the re-alimentation phase, previously restricted pigs showed full compensatory growth (CG) in terms of BW gain (1170 v. 1077 g/day; P < 0.002), whole-body protein deposition (Pd) (179 v. 163 g/day; P < 0.001) as well as physical and chemical body composition (whole-body lipid to body protein mass ratio, LB/PB; 1.14 v. 1.15; P > 0.10). Besides GH at 45 kg BW (4.2 v. 2.4 ng/ml; P = 0.066), there were no effects of previous AA intake restriction on leptin, IGF-I and BUN during the re-alimentation phase (P > 0.10). Plasma cortisol and IGF-I levels may act as an indicator of AA-induced restriction in Pd in growing pigs. Plasma BUN level does not appear as a sensitive indicator for compensatory Pd. Plasma leptin and GH levels allow for the involvement of the brain in controlling chemical body composition. Full CG was observed during the energy-dependent phase of Pd in growing pigs and might be driven by a target LB/PB, possibly mediated via plasma leptin, IGF-I and GH levels.

Keywords

amino acid restrictionbody compositioncompensatory growthendocrine statuspigs
Type
Full Paper
Information
animal , Volume 3 , Issue 2 , February 2009 , pp. 228 - 236
Copyright
Copyright © The Animal Consortium 2008

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Footnotes

*

Presented in part at the ADSA/CSAS/ASAS Annual Joint Meeting, Cincinnati, OH, USA, 2005, Abstract 295, Volume 83, Supplement 1.

**

The animal utilization protocol was reviewed and approved by the Animal Care Committee of the University of Guelph.

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