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Free-Range and Low-Protein Concentrated Diets in Iberian Pigs: Effect on Plasma Insulin and Leptin Concentration, Lipogenic Enzyme Activity, and Fatty Acid Composition of Adipose Tissue
Animals ( IF 3 ) Pub Date : 2020-10-19 , DOI: 10.3390/ani10101917
Juan F. Tejeda , Alejandro Hernández-Matamoros , Elena González

The purpose of this study was to investigate the effect of diets with different protein contents on carcass traits, plasma hormone concentration, lipogenic enzyme activities, and fatty acid (FA) composition in the adipose tissue of Iberian pigs. Twenty-four castrated male Iberian pigs (eight per feeding diet) were fed under free-range conditions with acorns and grass (FR), and in confinement with concentrated diets with standard (SP) and low-protein contents (LP) from 116.0 to 174.2 kg live weight. Backfat thickness was not affected by diet. The plasma leptin concentration was higher (p < 0.001) in the FR group than in the LP and SP groups, while insulin concentration was higher in the SP group than in the LP and FR groups. The lipogenic enzyme activities of glucose-6-phosphate dehydrogenase, malic enzyme, and glycerol-3-phosphate dehydrogenase were lower in the FR group compared to the LP and SP pigs. The activities of these enzymes were adipose-tissue-specific. No differences were found in FA composition of adipose tissue between the SP and LP groups, while the FR pigs had lower proportions of saturated FA and higher proportions of monounsaturated and polyunsaturated FA than the SP and LP pigs. In conclusion, feeding low-protein diets in Iberian pigs does not seem to affect adipose carcass traits, strengthening previous findings that indicate that this is a good strategy to improve meat and dry-cured product quality.

中文翻译:

伊比利亚猪的自由饮食和低蛋白饮食:对血浆胰岛素和瘦素浓度,脂肪酶活性和脂肪组织脂肪酸组成的影响

这项研究的目的是研究不同蛋白质含量的日粮对伊比利亚猪脂肪组织的car体性状,血浆激素浓度,脂肪酶活性和脂肪酸(FA)组成的影响。在自由放养的条件下,对二十四只cast割的伊比利亚雄性猪(每头饲喂日粮)饲喂橡子和草(FR),并在标准(SP)和低蛋白含量(LP)为116.0至60的集中日粮中进行饲养。 174.2公斤活重。背脂厚度不受饮食影响。血浆瘦素浓度较高(pFR组的<0.001)高于LP和SP组,而SP组的胰岛素浓度高于LP和FR组。与LP和SP猪相比,FR组的6-磷酸葡萄糖脱氢酶,苹果酸酶和-3-磷酸甘油脱氢酶的脂肪酶较低。这些酶的活性是脂肪组织特异性的。SP和LP组之间脂肪组织的FA组成没有发现差异,而FR猪比SP和LP猪具有较低的饱和FA比例和较高的单不饱和和多不饱和FA比例。总之,在伊比利亚猪中饲喂低蛋白日粮似乎不会影响a体脂肪性状,从而加强了先前的发现,表明这是提高肉和干腌产品质量的良好策略。
更新日期:2020-10-19
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