Testing the biological availability of fattening pigs diets made of vegetable components in trials on rats
1991
Korenek, M. | Lohajova, L. | Ivanko, S. | Dicakova, Z. | Ivankova, I. (Vysoka Skola Veterinarska, Kosice (CSFR))
The relations of metabolic changes in crude protein (NL) of various diets for pigs /feed mixtures (KZ) A1, A1R, VOR and VOR1, consisting exclusively of vegetable components/ which, containing only a negligible quantity of animal components in the KZ A1, are connected with digestion and with activities of some hepatic enzymes. Balance experiments have been made, using laboratory sewer-rats - males of the Wistar strain. Blended diets were made according to the KZ formulae and they were fed "ad libitum" during a six-day balance period (BP). Larsen's diet (LS) was used as a check, during a four-day preparatory period, as well as during the balance experiment. The highest weight gain was obtained when using the A1, (35,02 g) and as for the KZ A1R, VOR, VOR1 and LS diets, the weight gains were 29.3; 31.0; 30.1 and 33.4 g, resp. Diets containing the higher quantity of NL proved lower feed consumption and feed conversion efficiency; compared with diets containing the lower content of NL, where both consumption and conversion of fodder were higher. Along with the high digestibility 94.9-99.9 per cent, nitrogen (N) was retained mostly in the A1, A1R diets, compared with the nitrogen retention in the VOR, VOR1 and LS diets. The highest values of excreted nitrogen were in the LS diet, in even higher proportions than in the case of the KZ VOR1. Certain differences in the composition of amino acids and NL feed mixtures continuously reflect the relationships of examined biological factors; and in some comparisons, they also reflect the relationship of growth factors.
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