A study to compare differents protein sources in the diets of pigs weaned at three weeks age. 1. Digestibility and performance to 25 kg live weight
Abstract
One hundred and sixty-eight piglets were used in an experiment to avaluate 4 diets given from weaning at 3 weeks of age until the animal reached a live weight of 25 kg. The control diet (3) contained in each kilogram 255 g of crude protein (CP), 17 g of lysine, 62 g of added soya oil and 17.7 MJ of digestible energy (DE). Twenty-eight piglets were used in a metabolism trial. The other diets were formulated to contain the same ratio of crude protein and lysine per MJ. The cereal component of all diets was provided by equal portions of flaked maize and rolled oat groats. The protein supplement was either equal parts of white fishmeal and milk (3), heat-treated full-fat soyabean meal (1). soyabean meal with added lysine hydrochloride and soya oil to give the same oil as in the previous diet (2), and soyabean meal added lysine but no added oil (4). After weaning piglets were accomodated in small cages in groups of 7, each group constituting one experimental unit. The growth of piglets on the control diet (3) was outstanding, daily gains being 484 g/day in the first 5 weeks. Comparable pairs of results were 373 and 474, 361 and 447, and 351 and 447 g/day for pigs on treatments 1, 2 and 4 respectively (P < 0.05) and kcal required per kilogram of live-weight gain were 6,550, 6,520, 5.810 and 6,430 for 1, 2. 3 and 4 respectively (P < 0.05). The metabolism trial showed diet 3 as superior, digestibilities of dry matter (%) and nitrogens (%) and nitrogen ratio (g/day/kW0,75) were 83.3, 81.8 and 41.7; 85.8, 86.2 and 12.7; 91.7, 94.0 and 16.2, 84.9, 83.0 and 12.6 to diets 1, 2, 3 and 4 respectively. It is concluded the advantage of the control diets is in the suitability of the protein fraction to the digestive capacity of the young pig.Downloads
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