title: Artificial rearing of pigs. 5. The effect of different proportions of beef tallow or soya-bean oil and dried skim milk in the diet on growth, feed utilization, apparent digestibility and carcass compostion.
abstract: 1. Diets containing different proportions of skim milk and fat, either beef tallow or soyabean oil, supplemented with fat-soluble vitamins were given to 2-d-old pigs. Each fat source was used in three diets containing approximately 280, 350 and 420 g fat, and 260, 235 and 210 g protein/kg dry matter respectively. 2. The diets were given as a milk containing 200 g solids/l during a 26 d experiment. The pigs were given the diet at hourly intervals according to a scale based on live weight. 3. Increasing the energy content of the diet, with the accompanying decrease in protein content, had no effect on live-weight gain or feed: gain ratio (g feed dry matter/g live-weight gain) (other than a slight reduction in live-weight gain when beef tallow was used), or on nitrogen retention. However, the fat content of the carcass of the 28-d-old pig was increased, and its protein and ash content were decreased. 4. The apparent digestibilities of the fatty acids ranged from 0-96 to 1-00. The faeces from pigs given the soya-bean-oil diets contained some eicosanoic, docosanoic and tetracosanoic acids, presumably of bacterial origin. In general, palmitic and stearic acids were slightly less well digested than oleic and linoleic acids.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001835:Body Weight; D004041:Dietary Fats / Q000008:administration & dosage; D004063:Digestion; D005227:Fatty Acids / Q000378:metabolism; D005526:Food, Formulated / Q000592:standards; D050356:Lipid Metabolism; D008892:Milk; D008903:Minerals / Q000378:metabolism; D009821:Oils; D011506:Proteins / Q000378:metabolism; D013025:Glycine max; D013552:Swine / Q000378:metabolism*
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D008903:Minerals; D009821:Oils; D011506:Proteins