Effects of forages and total mixed rations particle size on physical effectiveness and chewing activity of lactating cows

Abstract

In study are determined effects of four different mean lengths of corn silage, alfalfa haylage and total mixed ration (TMR) for lactating cows on physical effectiveness (pef), physically effective fiber content (peNDF) and total chewing activity. High correlations were found between mean particle length of forages and TMR and their physical effectiveness in lactating cows nutrition as also with physically effective fiber content. Significant effect of ration particle size on stimulating total chewing activity of lactating cows was determined.

U istraživanju je determinisan uticaj četiri različita stepena usitnjenosti silaže cele biljke kukuruza, senaže lucerke i kompletno mešanog obroka za krave u laktaciji, na fizičku efektivnost (pef), sadržaj fizički efektivnih vlakana (peNDF), i ukupnu aktivnost žvakanja. Utvrđena je visoka povezanost stepena usitnjenosti kabastih hraniva i kompletnog obroka sa njihovom fizičkom efektivnošću u ishrani krava, kao i sa sadržajem fizički efektivnih vlakana. Ustanovljen je statistički značajan efekat stepena usitnjenosti obroka na stimulisanje ukupne aktivnosti žvakanja kod krava u laktaciji.