Untersuchungen zum einfluss oraler niacingaben bei unterschiedlicher proteinversorgung auf kennzahlen der pansenfermentation, blutinhaltsstoffe und die mastleistung von jungbullen

Abstract

The influence of added niacin (0, 0.5 or 1 g per animal per day) and different crude protein contents (9.2 to 12.0% of DM) or the supply of various N-sources (urea, rape seed meal, soya bean meal, fish meal) were investigated on rumen fermentation, blood parameters, feed intake, weight gain and dry matter (DM) intake per weight gain in three individual feeding experiments with 156 growing bulls weighing between 175 and 300 kg per animal. Niacin supplementation did not significantly influence (P > 0.05) investigated parameters of rumen fermentation and blood. Ruminal propionate concentration increased insignificantly (from 18.9 to 19.5 moles per 100 moles on the average), inorganic P of blood serum somewhat decreased (from 2.98 to 2.82 mmol per 1) when niacin was added (P > 0.05). Protein level did not significantly influence rumen fermentation and blood parameters except an increased urea concentration in the blood of cattle fed with diets richer in protein. The DM intake of control bulls and niacin supplemented animals amounted to 6.35 and 6.46 kg per animal per day on average. Influence of niacin on DM intake varied in dependence on protein source. The daily weight gain increased from 1003 (control) to 1040 g per animal per day (+ niacin, P > 0.05). Niacin increased weight gain of bulls of urea (+ 43 g) and rape seed or soya bean meal added rations (+ 60 g per animal per day), but did not influence the weight gain in fish meal added rations. Increased weight gain resulted from ruminal and metabolic effects (about 2/3) as well as enhanced feed intake of bulls (about 1/3). Feed efficiency mostly improved.

Effect of niacin supplementation on rumen fermentation characteristics and nutrient flow at the duodenum in lactating dairy cows fed a diet with a negative rumen nitrogen balance

“…A trend for an enhanced content of propionic acid in rumen fluid after niacin supplementation was found in trials with cows (Christensen et al 1996) and growing bulls (Flachowsky et al 1993). According to Itabashi and Kandatsu (1975), there is a positive correlation between number of protozoa and propionic acid release in the rumen which would match the present observations.…”

Niacin for dairy cattle: a review

“…In other studies not included in Table 5, glucose concentrations were equal in control and treatment groups ( 28 , 44 , 57 , 58 ) or there was an increase ( 59 ) in the niacin-supplemented group.…”