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Fat Deposition and Fatty Acid Composition in the Neonatal Pig¹

Animal Research Institute, Research Branch, Agriculture Canada, Ottawa, Ontario K1A 0C6

Abstract

Thirty male Yorkshire pigs, from six suckled litters, were killed in equal numbers at 0, 7, 14, 21 or 28 days of age. Blood glucose level increased by 32% in the first week of life but changed little thereafter; ß-hydroxybutyrate level peaked at 14 days of age, which coincided with a decline in the rate of fat deposition. Daily rate of fat deposition exceeded that of protein from 7 days of age onwards. Between 0 and 28 days backfat increased 30-fold, while its lipid concentration increased from 8.7 to 77.5%. The lipid concentration of liver showed no significant change, while that of muscle peaked at 7 days of age. Fatty acid composition of the different tissues was similar at birth but significant changes occurred during the first week; backfat in particular changed towards the fatty acid composition of sows' milk.

¹ Animal Research Institute, Contribution No. 749.

² The authors thank R. A. Arcand and R. S. Fouchard for their technical assistance.