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Effects of dietary inclusion of citrus pulp and rockrose soft stems and leaves on lamb meat quality and fatty acid composition

Published online by Cambridge University Press:  09 October 2017

A. Francisco
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Faculdade de Medicina Veterinária, Universidade Lisboa (ULisboa), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Instituto Nacional de Investigação Agrária e Veterinária, Pólo Investigação da Fonte Boa (INIAV-Fonte Boa), 2005-048 Santarém, Portugal
S. P. Alves
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Faculdade de Medicina Veterinária, Universidade Lisboa (ULisboa), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal
P. V. Portugal
Affiliation:
Instituto Nacional de Investigação Agrária e Veterinária, Pólo Investigação da Fonte Boa (INIAV-Fonte Boa), 2005-048 Santarém, Portugal
M. T. Dentinho
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Instituto Nacional de Investigação Agrária e Veterinária, Pólo Investigação da Fonte Boa (INIAV-Fonte Boa), 2005-048 Santarém, Portugal
E. Jerónimo
Affiliation:
Centro de Biotecnologia Agrícola e Agro-Alimentar do Alentejo (CEBAL), Instituto Politécnico Beja (IPBeja), 7801-908 Beja, Portugal
S. Sengo
Affiliation:
Centro de Biotecnologia Agrícola e Agro-Alimentar do Alentejo (CEBAL), Instituto Politécnico Beja (IPBeja), 7801-908 Beja, Portugal
J. Almeida
Affiliation:
Instituto Nacional de Investigação Agrária e Veterinária, Pólo Investigação da Fonte Boa (INIAV-Fonte Boa), 2005-048 Santarém, Portugal
M. C. Bressan
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Instituto Nacional de Investigação Agrária e Veterinária, Pólo Investigação da Fonte Boa (INIAV-Fonte Boa), 2005-048 Santarém, Portugal
V. M. R. Pires
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Faculdade de Medicina Veterinária, Universidade Lisboa (ULisboa), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal
C. M. Alfaia
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Faculdade de Medicina Veterinária, Universidade Lisboa (ULisboa), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal
J. A. M. Prates
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Faculdade de Medicina Veterinária, Universidade Lisboa (ULisboa), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal
R. J. B. Bessa*
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Faculdade de Medicina Veterinária, Universidade Lisboa (ULisboa), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal
J. Santos-Silva
Affiliation:
Centro Investigação Interdisciplinar em Sanidade Animal (CIISA), Avenida Universidade Técnica, 1300-477 Lisbon, Portugal Instituto Nacional de Investigação Agrária e Veterinária, Pólo Investigação da Fonte Boa (INIAV-Fonte Boa), 2005-048 Santarém, Portugal
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Abstract

Meat from lambs finished with high-starch diets often contains low concentration of vaccenic (t11-18:1) and rumenic (c9,t11-18:2) acids and high concentration of t10-18:1. We hypothesized that replacing cereals by dehydrated citrus pulp (DCP) and the inclusion of tanniferous feed sources in oil supplemented diets might reduce the accumulation of t10-18:1 and increase the t11-18:1 and c9,t11-18:2 in lamb meat, without affecting the productive performance. In total, 32 lambs were assigned to four diets which combine two factors: basal diet (BD) (cereals v. DCP) and Cistus ladanifer (CL) (0 v. 150 g/kg dry matter). Feed intake, average daily weight gain and carcass traits were not affected by treatments, except for dressing percentage that was reduced with DCP (P=0.046). Both DCP and C. ladanifer reduced tenderness and juiciness of meat, and C. ladanifer also reduced (P<0.001) meat overall acceptability. Intramuscular fat and the concentration of saturated and polyunsaturated fatty acids (FA) were not affected (P>0.05) by diets. However, DCP increased the proportions of odd-chain FA (P=0.005) and several minor biohydrogenation (BH) intermediates in meat lipids. C. ladanifer had few effects on meat FA profile. The proportions of t11-18:1 and c9,t11-18:2 were high in all diets (5.4% and 1.5% of total FA, respectively) and were not influenced by the treatments. Basal diet and CL showed some significant interactions concerning FA composition of intramuscular fat. In diets without C. ladanifer, replacement of cereals by DCP increased the 18:0 (P<0.05) and decreased t10,c12-18:2 (P<0.05), t10-18:1 (P<0.10) and t10-/t11-18:1 ratio (P<0.10) with a large reduction of the individual variation for t10-18:1 and of t10-/t11-18:1 ratio. Combined with cereals, C. ladanifer increased 18:0 and reduced the BH intermediates in meat. Replacement of cereals by DCP seems to promote a more predictable FA profile in lamb meat, reducing the risk of t10-shifted BH pathways in the rumen.

Type
Research Article
Copyright
© The Animal Consortium 2017 

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