The purpose of carried investigations was to compare the digestive tracts in swine, wild boars and in the swine × boars hybrids (S×BH). The parts of animal digestive tracts were evaluated in the group of animals comprised of 3 wild boars (in the similar body weight and age – 40 kg and full physiological maturity) as well as five swine and five male S×BH characterized by a full physiological maturity and average body weight about 100 kg. The measurements of the digestive tracts in experimental animals were performed according to method described by Horszczaruk. As an effect of carried investigations the better development of this part of digestive tract where the enzymatic fermentation is much more efficient than microbial one was stated. Obtained results indicate that in wild boars and in S×BH the parts where the fermentative processes happen were the best developed. The length of small intestine in swine amounted about 83% of total length of digestive tract. In boars this value was lower by 11% and in the S×BH the small intestine constituted of 79% of total length of gastrointestinal tract. From obtained data it can be concluded that in examined animals the diversification of particular parts of digestive tracts occurred.

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