The paper presents some current problems related to pig nutrition at the intensive and organic rearing systems. Issues shared by both sectors of the pig management as well as specific organic feeding regimes are discussed. A growing concern in nutrient balance has been emphasized, especially protein digested in the caudal segment of the small intestine. Besides, the problems of animal welfare in both management systems were addressed along with the ban on growth promoter application (hormones and antibiotics) that appear to be redundant or even hazardous for human health.
Podjęto próbę określenia wpływu stosowania w żywieniu tuczników dawek z udziałem CCM, ziemniaków parowanych, pasz przemysłowych oraz śrut zbożowych i serwatki. Najkorzystniejszy wskaźnik paszochłonności uzyskano przy zastosowaniu CCM i śrut zbożowych z udziałem serwatki. Pasze te charakteryzowały się także najniższym przeciętnym kosztem jednostki owsianej, co spowodowało, że jednostkowy koszt przyrostu masy był najniższy, w grupach tych uzyskano także najniższą energochłonność przyrostu masy tuczników oraz najkorzystniejszy wskaźnik sprawności energetycznej .
During the summer season, plasma concentrations of insulin-like growth factor I (IGF-I) inArabian,Anglo-Arabian and Hucul horses as well as colts and fillies were higher compared to the winter season. Significant differences in IGF-I concentration between the seasons were found in Hucul horses (P≤0.01) and in colts (P≤0.05). Season had no significant effect on 1.25(OH)2-D3 concentration in the horse breeds studied. However, plasma concentrations of this hormone were always higher in the summer than in the winter season regardless of the breed (exceptAnglo-Arabians) and sex. Knowledge and monitoring of the physiological concentrations of IGF-1 and vitamin D3 metabolites in different seasons of the year, combined with analysis of growth rate during these periods may contribute to the improvement of the horse management and feeding system. Because of the association between these hormones and the frequency of developmental orthopaedic diseases, this information could be potentially used in veterinary practice.