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The study was carried out during the finishing period of 70 days. A total of 18 Limousin bulls at an initial weight of approx. 440 kg were divided into three analogous feeding groups (6 animals per group) according to body weight. Each feeding group was given a different bulky feed on an ad libitum basis: maize silage (group KK), wilted meadow grass silage (group KT) or both silages (group KKKT). These were supplemented with meadow hay (1 kg/day) and concentrate mixture (1-1.2 kg/100 kg body weight). Body weight, chemical composition and fatty acid profile of the feeds were determined. Chemical composition, levels of fatty acids and total cholesterol in the meat samples from the thoracis muscle (TM), and dressing percentage were also determined. Limousin bulls fed meadow grass silage had lower levels of saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA), higher levels of polyunsaturated fatty acids (PUFA, especially C 18:3 n-3) and a narrower n-6/n-3 PUFA ratio than animals fed maize silage or both silages. Similar results were obtained in groups for carcass meat content, dressing percentage and total cholesterol content.
Impact of food type on long term consumption kinetics in group-housed domestic cats (Felis catus). The aim of the current research was to assess the impact of the type of dry food on the long term acceptance in cats, expressed as consumption curves. A group of 14 adult neutered domestic cats were subsequently offered three types of products: economy, medium and premium. The consumption of food has been carefully monitored each day of the experiment, which enabled the drawing of the precise consumption curve. The average daily consumption showed differences between feeding periods (98.33%, 61.17% and 55.04% for premium, medium and economy diet type, respectively). In all groups the monotony effect has been observed, but the relative stability of the consumption has been observed only in cats fed with the premium type of food. The attractiveness of the economy type of food was distinctively low, resulting in a regularly waved consumption curve. It can be concluded, that the prolonged offering of a particular type of complete dry pet food within the limits of metabolizable energy requirements may potentially lead to adverse consequences for cats. The food consumption level that supplies the minimal daily energy amount can likely result in imbalanced macronutrient intake.
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