Evaluation of rumen fermentation in autumn grazing dairy cows using rumen fluid samples obtained by rumenocentesis
DOI:
https://doi.org/10.29059/cvpa.v1i2.19Keywords:
VFAs, N-NH3, grazing, rumen, dairy cowsAbstract
To evaluate rumen parameters of fermentation, less invasive techniques such as rumenocentesis are preferred. This method was used to evaluate the pH, concentration of NH3-N, and volatile fatty acids (VFAs) in dairy cows. The cows were grazing on two pasture allowances (17 and 25 kg MS/cow/day) and receiving either grass silage (PS) or corn silage (CS) (at a rate of 6.2 kg DM/cow/day). The results showed that including corn silage in the diet compared to grass silage caused changes in rumen pH (p < 0.05). However, there were no significant changes in the concentrations of NH3-N and VFA due to the effect of the pasture supply or type of silage in the diet. In conclusion, rumenocentesis is a less invasive technique that can be used to compare diets of dairy cows. The analysis of rumen samples obtained by rumenocentesis showed that corn silage decreased rumen pH with a higher ratio of glucogenic acids.
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