The aim of the study was to measure the effect of different strains of live and viable Saccharomyces cerevisiae yeast cultures (Sc) with different dosage on rumen fermentation, metabolic status, and milk production in dairy cows. Holstein-Friesian cows in early lactation were randomly assigned to 5 groups of 25 cows and fed on daily rations that contained Sc as follows: Group K: control, not treated; A: 20 g (2.1×1010 CFU/g) Sc- B: 5 g (1.7times;1010 CFU/g) Sc; C: 5 g (2.5×1010 CFU/g) Sc; D: 10 g (4×107CFU/g) Sc daily. In each group 12 cows were randomly selected for monitoring the metabolic status and parameters of rumen fermentation. Milk yield and milk quality indices were measured by the Hungarian Milk Recording Ltd on monthly basis with 25 cows/group. Blood, urine and rumen fluid samples were taken monthly, 3-5 hours after morning feeding; at the beginning of the experiment and once a month onward until 90th day of the experiment. Parameters of energy metabolism (blood aceto-acetic acid, NEFA, glucose), protein supply (blood and urine urea, blood total protein), acid-base metabolism (urine and rumen pH, urine NABE) and volatile fatty acid (VFA) concentration (rumen fluid total volatile fatty acid, acetate, propionate, butyrate) was determined. At the first sampling that preceeded the start of the 90 day period of feeding the experimental diet no differences were found between parameters of the control and experimental groups. There was, however, significant (P<0.001) increase in rumen pH, acetate molar ratio, acetate:propionate ratio and a decrease in the propionate and butirate molar ratio and total VFA concentration in group C and D but not in others in later phase of the investigation. There was no significant and remarkable difference in metabolic parameters during the experimental period, but there was significant (P<0.01) increase in body condition scores in treated cows. Significant (P<0.05) increase was detected in milk protein percentage in all treated groups, but not in the control. There was no significant difference in butter fat percentage between the groups. The milk yield (4% FCM milk kg) was higher in the treated animals, compared to control, but the difference was significant (P<0.01) only in case of group D.
|Number of pages||10|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Dec 1 2007|
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