Open AccessUTICAJ USITNJENOSTI KOMPLETNOG OBROKA ZA KRAVE U LAKTACIJI NA VREME KONZUMIRANJA I PREŽIVANJA HRANEI HEMIJSKI SASTAV MLEKA
Author(s) -
Blagoje Stojkovic,
Bojan Stojanović,
Nenad Đorđević,
G. Grubić,
Vesna Davidović,
Aleksa Božičković,
Radovan Rakovic
Publication year - 2021
Publication title -
zbornik radova
Language(s) - English
Resource type - Conference proceedings
eISSN - 2584-6159
pISSN - 0350-8552
DOI - 10.46793/sbt26.167s
Subject(s) - rumination , particle size , total mixed ration , zoology , chemistry , food science , lactation , medicine , biology , ice calving , pregnancy , cognition , psychiatry , genetics
The paper presents research results regarding impact of Total Mixed Ration (TMR)particle sizeon eating time, rumination time, milk yieldand chemical composition for cows in the late lactation (over 150 days). To determine physical form and particle fractions’ ratio of TMR, the Pen State Particle Separator (PSPS) wasused. The cow collars with sensors that respond to sound detection (GEA CowScout Neck) were used to monitorthe eating timeand rumination time.It was determined that different particle fractions’ ratio of TMRhas a significant effect on rumination time (p <0.01),as also on content of milk fat (p <0.01) andprotein (p <0.05).The use of TMR with larger average particle size (6.87 mm) had a positive effect in terms of ruminationtime (400.1 min/day), compared to TMR with a smaller particle size (5.55 mm), where the average rumination timewas (371.1 min/day).Also, the positive effect of TMR with a larger average particle size was reflected in higher milk fat (4.38%) and protein (3.84%) content compared to TMR with a smaller particle size (4.15% and 3.76%, respectively). By providing appropriate physical form of TMR, better rumination time can be achieved along with improving of milk chemical composition.