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The effect of the use of the emulgator Lysoforte was investigated in the 33 days” experiment on piglets. Piglets weaned at the age of 28 days were divided into two groups - experiment (E) and control (C) - 10 piglets in each. In E group Lysoforte was fed as an additive (1 kg/ton) to the commercial mixture ČOS without growth promoters. The live weight and feed consumption were recorded individually. At the end of the first week of the experiment the piglets” faeces were collected during two days to determine the digestibility of dry matter, nitrogenous substances, fibre, fat,organic matter and ash by means of a calculation of the proportion of ash insoluble in HCl. There was no effect of Lysoforte on the daily gain of piglets (C = 339 g, E = 342 g), but the feed intake per kg live weight gain was found lower (C = 1.899, E = 1.770 kg). The digestibility of all proximate feed components was found higher in E piglets - the inter-group difference for dry and organic matter reached approx. 5%, those for fibre, nitrogenous substances and ash from 9.5 to 13.4 %, and 49% for fat. The economic evaluation proved the return of increased expenses per 1 kg of the feeding mixture by adding Lysoforte from 14.40 to 14.60 CZK/kg. The cost of feed per 1 kg live weight gain was reduced by 5.5% (C = 27.346, E = 25.842 CZK).
The objective of this research was to determine the effect of group size on pig performance. A field study was carried out during 15 months. The building had 52 pens in total, which housed grower pigs to 35-38 kg body weight. During the first 8 months the average number of animals was 726. During the time of most significant decrease of performance in months 9 and 10 the average number went up to 751 animals. A reduction in total feed intake was observed during months 9, 10 and 11 and the average consumption of compound feed per animal and day dropped to 1.68, 1.32 and 1.09 kg. Consequently the weight gain decreased to 615, 535 and 505 g, respectively. The example showed the negative influence of overstocking of grower pigs on the essential performance indicators, such as weight gain, compound feed consumption per feeding day and feed conversion. The number of animals in pens should be decided on the basis of stocking density which influence positively performance. The size of the lying area for this particular age group and this particular building should be between 0.48 and 0.51 sq m per animal.
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