65 research outputs found
Efeitos de níveis e períodos de adaptação à lasalocida sódica sobre os parâmetros de fermentação ruminal
Concentrations of toxic heavy metals and trace elements in raw milk of Simmental and Holstein-Friesian cows from organic farm
Complexed versus amino acid-chelated trace mineral programs in high-risk calves during receiving1
Effect of supplemental trace minerals from injection on health and performance of highly stressed, newly received beef heifers
Effect of simulated ambient particulate matter exposure on performance, rectal temperature, and leukocytosis of young Spanish goats with or without tilmicosin phosphate1
Effect of Source and Amount of Zinc, Copper, Manganese, and Cobalt Fed to Stressed Heifers on Feedlot Performance and Immune Function
Comparison of methionine hydroxy analogue chelated versus sulfate forms of copper, zinc, and manganese on growth performance and pregnancy rates in yearling beef replacement heifers
Effects of supplementing humates on rumen fermentation in Holstein steers
Humates have nitrogen-binding qualities that could prove to be beneficial in the retention of ammonia nitrogen in the rumen of Holstein steers fed a high-concentrate finishing diet. Therefore, four ruminally fistulated Holstein steers were used in a 4 x 4 Latin Square design to determine the effects of humates (HA) on serum urea nitrogen, rumen pH, rumen ammonia nitrogen and volatile fatty acid (VFA) production. Steers were randomly assigned one of four treatments; a control (0), 5.0, 10.0 or 15.0 g/kg HA (DM basis). The steers were fed ad libitum for 21 days prior to sample collection with dry matter intake (DMI) determined from days 14 to 21. For DMI, a quadratic response was observed; lowest for 5.0 and 10.0 g/kg HA and highest for 15.0 g/kg HA compared to control. Treatment by time interactions was not observed. No treatment differences were observed for total VFA concentrations (mM), or molar proportions of acetate, propionate, butyrate or valerate, but there was a quadratic response observed for butyrate. It was determined that HA do not alter rumen fermentation of Holstein steers fed high-concentrate diets.Keywords: Humic acid, volatile fatty acids, high-concentrate diets, serum urea nitrogen, intak
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