Ragaller, Veronika: Effects of folic acid and pantothenic acid supplementation to two rations on rumen fermentation, duodenal nutrient flow and serum and milk variables of dairy cows. - Bonn, 2010. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5N-20548
@phdthesis{handle:20.500.11811/4197,
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5N-20548,
author = {{Veronika Ragaller}},
title = {Effects of folic acid and pantothenic acid supplementation to two rations on rumen fermentation, duodenal nutrient flow and serum and milk variables of dairy cows},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2010,
month = apr,

note = {The aim of the present experiments was to investigate the influences of a daily supplementation of 1 g folic acid (FA), respectively pantothenic acid (PA) on ruminal fermentation, as well as on serum and milk variables. German Holstein cows with one cannula in the dorsal sac of the rumen and another in the proximal duodenum received a ration with a forage to concentrate ratio (F:C) of 34:66 (high concentrate, HC) in the first part of each experiment and in the second part of 66:34 (high forage, HF). Each ration was fed with and without FA or PA supplementation. Thereby, the influences of the ration composition on the synthesis and/or degradation of folates, FA and PA due to ruminal microorganisms were to be investigated. The number of lactating and dry cows was in the first part of the FA experiment four and two, and in the second part four and four. In the first part of the PA experiment it was six and two and in the second part five and four. Regardless of the dietary F:C ratio, both vitamins had rather minor effects on ruminal fermentation as well as on the serum and milk variables. However, irrespective of the ration the FA supplementation increased the serum 5-methyl-tetrahydrofolate concentration. The PA supplementation only increased the duodenal PA flow during the feeding of the HF ration. Irrespective of the ration, the serum and milk PA concentrations as well as the milk PA yields were not influenced by the PA supplementation. However, feeding the HC ration always resulted in higher PA amounts in all considered fluids compared to the HF ration. This was the same for the folate amounts in the serum. Thus, the results of the present experiments show that a 1 g FA supplementation increases the 5-methyl-tetrahyrofolate concentration in the serum, but no positive effects for the dairy cows were detectable, while a 1 g PA supplementation neither increases the PA concentrations in the serum or in the milk. However, the apparent disappearance between mouth and duodenum for PA was between 88 and 97%.},
url = {http://hdl.handle.net/20.500.11811/4197}
}

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