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Dietary Protein to Calorie Ratios and Fat Sources for Neonatal Pigs Reared Artificially with Subsequent Performance. II. Serum Variables^{1 ,2,}

University of Missouri³, Columbia 65201

Abstract

Two experiments were conducted to determine the effects of fat sources and protein to calorie ratios in diets upon serum variables of pigs from 1 to 23 days of age. The calculated diet composition ranged from 25.6 to 28.2% crude protein, from 4.20 to 4.85 Meal DE/kg and from 53 to 67 g of crude protein per Meal of digestible energy with dried skim milk and soybean meal each providing 50% of the protein. The poor utilization of the more saturated fat by the neonatal pig resulted in lower (P<.05) serum levels of cholesterol, triglycerides, phospholipids and total lipid compared to the serum levels of pigs fed the more unsaturated fat. The serum levels of glucose, urea nitrogen and total protein of the neonatal pig were markedly resistant to infuence (P>.05) by the range of protein to calorie ratio used in these diets. However, the serum levels of cholesterol, triglyceride, phospholipid and total lipid increased with the level of dietary fat and declined with increasing protein to calorie ratio. The serum levels of total protein, cholesterol, triglycerides and phospholipids decreased with age while the serum levels of glucose increased with age.

¹ Contribution from the Missouri Agricultural Experiment Station.

² Thanks are extended to R. F. Miller, Merck Company; Dr. Maxwell L. Cooley, Syntex Agribusiness, Inc.; V. R. Heaton, Calicium Carbonate Company and Dr. C. R. Adams, Hoffman La Roche Inc., for providing synthetic amino acids, minerals and vitamins.

³ Animal Husbandry Department, 110 Animal Science Research Center.