Relation among back fat thickness, fat cell size and fatty acid composition of swine

• Published in: Japanese Journal of Swine Husbandry Research (Japan) Vol. 22; no. 3; pp. 181 - 187
• Main Authors: Chikuni, K, Jimbu, M, Ozawa, S, Koishikawa, T, Yoshitake, M, Yano, N. (National Inst. of Animal Industry, Kukizaki, Ibaraki (Japan))
• Format: Journal Article
• Language: Japanese
• Published: The Japanese Society of Swine Science 1985; 日本養豚学会
• Subjects: ACIDE GRAS; ACIDOS GRASOS; ADIPOSE TISSUES; BACK; CELLS; CELLULE; CELULAS; CERDO; COMPOSICION; COMPOSITION; DORSO; DOS; EPAISSEUR; ESPESOR; FATTY ACIDS; GROSSEUR; PORCIN; SIZE; SWINE; TAMANO; TEJIDO ADIPOSO; THICKNESS; TISSU ADIPEUX
• ISSN: 0388-8460; 2186-2567
• DOI: 10.14899/youton1964.22.181

Barrows and gilts of Landrace, Hampshire and Duroc were used to clarify the relation between adipose tissue development and fatty acid composition of back fat. Two kinds of feeds with different TDN levels (A and B) were allocated to these animals ad libitum from their live weight of 30kg up to 90kg. Samples for analysis were collected from the back fat layers of the animals slaughtered at 90kg live weight. Significant correlation was found out between the thickness of back fat layer and the composition of fatty acids in it in both groups. Especially close correlation was noted between the amount of linoleic acid in the fat and the thickness. A negative correlation was found between the amount of linoleic acid in the fat and the sizes of the adipose cells, whereas positive correlation was found between the sizes of the adipose cells and the amount of saturated fatty acios. It was assumed that the relation between the thickness of the back fat layer and the composition of fatty acids is expressed subject to the variations in the ability for synthesis of fatty acids. The results of the distribution analysis of the thickness of the back fat layer, sizes of the adipose cells and the composition of fatty acids in the back fat using the breeds, sexes and the kinds of feedstuffs as the factors revealed that there were significant differences in almost all the assay items due to these factors. The mean values of these items by dreeds revealed that the thickness of back fat layer and the sizes of the adipose cells were in the decreasing order of Landrace>Hampshire>and Duroc in this decreasing order, whereas the content of linoleic acid in the back fat layer was in the decreasing order of Hampshire>Duroc>Landrace. The thickness of the back fat layer in conjunction with sexes was in the decreasing order of barrows>gilts, while the content of linoleic acid in the back fat was in the decreasing order of gilts>barrows. Therefore, it was assumed that there were variations in the abilities of biosynthesis of fatty acids with the breeds and with the sexes, both of which are the causes for the differences in the thickness of back fat layer and in the composition of fatty acids. A similar tendency was also noted among the thickness of back fat layer, sizes of fatt cells and composition of fatty acids subject to the differences in the litters even in the same breed.