Effect of physically effective fiber content in dairy cows rations on chewing activity | Uticaj sadržaja fizički efektivnih vlakana u obroku za mlečne krave na aktivnost žvakanja
2011
Stojanović, B., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Grubić, G., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Đorđević, N., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Božičković, A., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Ivetić, A., Poljoprivredni fakultet, Beograd - Zemun (Serbia)
The effects of physically effective fiber concentration in rations for lactating cows on chewing activity, physiological and production characteristics are reviewed in the paper. In numerous investigations negative effects of decreasing of forage particle size were found, first of all in corn silage, alfalfa haylage and hay, on total chewing activity of dairy cows, ruminal pH, ruminal acetate to propionate ratio, digestibility of diet, milk yield and composition. Aside from the minimal chemical concentration of fibers, it is necessary to meet the required content of physically effective fiber from forages, which can be achieved with adequate chopping size of feeds. Optimal rations considering physical effectiveness, supply the required total chewing activity, adequate salivation and ruminal fermentation processes, efficient utilization of the diet, adequate milk yield and composition, and health in production animals.
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