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The aim of the study was to determine the influence of diet on CLA, cholesterol and fatty acids content in the most valuable parts of rabbits’ carcasses (saddle, thigh). The research material consisted of muscles taken from 12 male rabbits (crossbreeds), at the age of 9 months and at the body weight of 3.5-4 kg. The rabbits were divided into two research groups depending on the kind of diet they were fed. The first group consisted of rabbits fed according to a typical ecological model while the second group was fed an all-mash diet. The results confirm an influence of the diet on CLA, cholesterol and fatty acids content in rabbits’ meat. The highest values of CLA content were in the thighs and saddle for group II and were 16.9 and 13.59 mg/kg of fresh tissue respectively. The meat from group I of rabbits contained a lower level of cholesterol from 28.81 mg/100 g of comber to 31.39 mg/100 g of thigh muscle while for the same parts of rabbits’ carcasses from group II these values were 29.99 and 36.03 mg/100 g respectively. It is worth noting that a more advantageous profile of fatty acids occurs in the meat from the ecological group, especially PUFA n-6 to PUFA n-3 ratio.
The aim of the study was to examine CLA (cis 9 trans 11) content in milk depending on rations used, number of lactation, its phase and the productivity of cows as well as fat content in milk. The studies were carried out on 429 cows fed pasture during summer and 41 cows fed TMR. It was found that the CLA content in milk is determined by feeding as well as by other, unconnected factors. From the consumer’s point of view, the most beneficial influence had a ration in which the only juicy roughage was green pasture forage while the concentrate constituted an addition of about 10% of dry matter. Among winter rations based on conserved fodders, the one with a predominance of wilted grass silage was observed to have a more beneficial influence. However, feeding with the TMR system resulted in the smallest CLA content. It was found that the CLA content was the highest in milk from older cows in their 4th lactation and in the period beyond the 120th day of lactation. Moreover, the highest content of CLA was observed in cows with a moderate level of milk production (below 6.000 kg). These findings justify creating ecological farms keeping cows. The analysis of minimal and maximal values of CLA content in the milk of investigated cows reveals big individual differences, so that further research should be carried out in order to explain the existing divergences. Milk collected from family farms dominating in Poland - where summer feeding is based on green forages and pasture thanks to its healthful properties (measured by the CLA content) may constitute a serious competition to milk produced in other EU countries, where the TMR feeding system prevails and farmers increasingly abandon grazing their cows on pasture.
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