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Food, fibre and pharmaceuticals from animals
RESEARCH ARTICLE

Metabolism of glycerol in pigs fed diets containing mixed crude glycerin and β-adrenergic agonist

A. B. F. Pinto A , L. de P. Naves B D , I. G. Lima A , C. A. P. Garbossa C , S. R. Silva Júnior B , A. M. S. Barbosa B , C. L. Maluf A , P. V. Rosa B , M. G. Zangeronimo A , V. de S. Cantarelli B and R. V. Sousa A *
+ Author Affiliations
- Author Affiliations

A Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Caixa Postal 3037, CEP 37200000, Brazil.

B Departamento de Zootecnia, Universidade Federal de Lavras, Lavras, Minas Gerais, Caixa Postal 3037, CEP 37200000, Brazil.

C Departamento de Nutrição e Produção Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, São Paulo, CEP 13635900, Brazil.

D Corresponding author. Email: luciananaves@ufla.br

Animal Production Science 59(9) 1631-1639 https://doi.org/10.1071/AN18210
Submitted: 24 March 2018  Accepted: 3 January 2019   Published: 8 February 2019

Abstract

The optimised use of mixed crude glycerin (MCG) and ractopamine hydrochloride (RH) in diets for finishing pigs requires a better understanding of glycerol metabolism. Therefore, the present study evaluated the performance, blood parameters, metabolite concentrations in the Longissimus lumborum muscle and the activity of enzymes in the liver, subcutaneous adipose tissue and kidney of pigs fed diets containing MCG and/or RH. According to the initial weight, 64 barrows were distributed in a 4 × 2 factorial design, corresponding to four concentrations of MCG (0, 100, 150, and 200 g/kg) in diets containing 0 or 10 mg/kg of RH. There was no MCG × RH interaction for any of the evaluated parameters (P > 0.05). Moreover, there was no isolated effect of dietary MCG or RH on the weight gain and the blood concentrations of glucose, insulin, triacylglycerols, total cholesterol, total protein, albumin, creatinine, cortisol and lactate (P > 0.05). There was a higher rate of phosphorylation of glycerol in the liver, stimulation of lipogenesis in adipose tissue and a likely increase in the utilisation of glycerol by muscle fibres in response to an increased concentration of circulating glycerol from the diet (P < 0.05). In contrast, when the diet contained up to 200 g/kg MCG and 10 mg/kg RH, there were indications of a lower utilisation of glycerol for the synthesis of triacylglycerols in muscle, liver and adipose tissue, in addition to increased oxidation of amino acids in the liver followed by improved feed conversion of pigs (P < 0.05).

Additional keywords: animal metabolism, glucose-6-phosphate dehydrogenase, glutamate dehydrogenase, glycerol kinase, glycerol-3-phosphate dehydrogenase, malic enzyme.


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