Uticaj usitnjenosti kompletnog obroka za krave u laktaciji na vreme konzumiranja i preživanja hranei hemijski sastav mleka | Effect of lactating cows’ tmr particle size on eating and rumination time and chemical composition of milk
2021
Stojković, Blagoje | Stojanović, Bojan | Đorđević, Nenad | Grubić, Goran | Davidović, Vesna | Božičković, Aleksa | Raković, Radovan
The paper presents research results regarding impact of Total MixedRation (TMR)particle sizeon eating time, rumination time, milk yieldand chemicalcomposition for cows in the late lactation (over 150 days). To determine physicalform and particle fractions’ ratio of TMR, the Pen State Particle Separator (PSPS)wasused. The cow collars with sensors that respond to sound detection (GEACowScout Neck) were used to monitorthe eating timeand rumination time.It wasdetermined that different particle fractions’ ratio of TMRhas a significant effect onrumination 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 positiveeffect in terms of ruminationtime (400.1 min/day), compared to TMR with a smallerparticle size (5.55 mm), where the average rumination timewas (371.1min/day).Also, the positive effect of TMR with a larger average particle size wasreflected in higher milk fat (4.38%) and protein (3.84%) content compared to TMRwith a smaller particle size (4.15% and 3.76%, respectively). By providingappropriate physical form of TMR, better rumination time can be achieved alongwith improving of milk chemical composition.
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