The effect of perroraly added chestnut tannins on daily gain and composition of faeces in sheep and goats | Vpliv peroralno dodanih kostanjevih taninov na dnevni prirast in sestavo iztrebkov pri ovcah in kozah

anglais. The effect of extracted tannins from chestnut wood (Castanea sativa Mill.), which were added to the diet for sheep and goats was studied. Preparation (Tanin, Sevnica) contained 74 % mainly hydrolysable tannins. 21 young sheep and 10 goats, which grazed at the Karst region, were included into the experiment. Every three days the amount of 0.5 g preparation kg–1 body weight was applied to thirteen young sheep and five goats. Eight young sheep and five goats were observed as a control group. All sheep and goats grazed at the same paddocks on the same pasture. The experiment lasted 68 days. The average daily gain of the experimental group of sheep was 37 g day–1 and 18 g day–1 of the control group of sheep. The differences in daily gains of the young sheep were not statistically significant. In the first period (35 days), the experimental group of sheep had less dry matter (189–217 g kg–1 vs. 195–229 g kg–1), more crude protein (177–157 g kg–1 DM vs. 170–142 g kg–1 DM) and more tannins (0.77–0.61 % in DM vs. 0.73–0.52 % in DM) in faeces than the control group of sheep. The correlation between the tannins and crude protein content in the faeces of sheep was highly statistically significant (r = 0.92, P < 0.05). Results demonstrate the effect of added chestnut tannins on the composition of faeces, what is probably due to the place of digestion of the ingested nutritive substances. Both groups of goats lost body weight (–79 g day–1). In the faeces of goats there were more dry matter (192–297 g kg–1) and less crude protein (108–144 g kg–1 DM) and tannins (0.24–0.48 % in DM) than in the faeces of sheep.

slovène. V raziskavi smo proučevali učinek ovcam in kozam v obrok dodanega izvlečka taninov lesa pravega kostanja (Castanea sativa Mill.), ki vsebuje 74 % pretežno hidrolizirajočih taninov. V poskus smo vključili 21 jagnjic in 10 koz, ki so se pasle na kraškem pašniku. Trinajstim jagnjicam in petim kozam smo vsake tri dni peroralno dajali pripravek kostanjevih taninov v odmerku 0,5 g kg–1 telesne mase. Osem jagnjic in pet koz smo spremljali kot kontrolni skupini. Živali so se pasle skupaj v ogradah na istem pašniku. Poskus je trajal 68 dni. Jagnjice poskusne skupine so na paši priraščale v povprečju 37 g dan–1, jagnjice kontrolne skupine pa 18 g dan–1. Razlike v dnevnih prirastih jagnjic niso bile statistično značilne. V prvem obdobju (35 dni) je bilo v iztrebkih jagnjic poskusne skupine manj SS (189–217 g kg–1 vs. 195–229 g kg–1), več SB (177–157 g kg–1 SS vs. 170–142 g kg–1 SS) in več taninov (0,77–0,61 % v SS vs. 0,73–0,52 % v SS) kot v iztrebkih jagnjic kontrolne skupine. Povezava med vsebnostjo taninov in surovih beljakovin v iztrebkih jagnjic je bila statistično značilna (r = 0,92, P < 0,05). Rezultati kažejo, da dodani kostanjevi tanini vplivajo na sestavo blata, kar je verjetno posledica mesta prebave zaužitih hranil. Obe skupini koz sta v poskusu hujšali (–79 g dan–1). V iztrebkih koz je bilo več suhe snovi (192–297 g kg–1) in manj surovih beljakovin (108–144 g kg-1 SS) ter taninov (0,24–0,48 % v SS) kot v iztrebkih jagnjic.