Research Article Open Access

The Association between Total Mixed Ration Particle Size and Fecal Scores in Holstein Lactating Dairy Cows from Florida, USA

Pedro Melendez1 and Elizabeth Roy2
  • 1 University of Missouri, United States
  • 2 University of Florida, United States

Abstract

The objective of this study was to determine the association between the proportion of particles greater than 19 mm in a total mixed ration fed to dairy cattle and their fecal score. Over a 22 day period, random feed samples were collected twice a day from a one-side barn and assessed for particle size using the Pennsylvania State Particle Separator. In addition, at each feeding sampling, the same barn was inspected and fresh feces were scored on a four point scale. Multiple regression models were developed to associate the proportion of particles >19 mm with fecal scores at one, two and three days after that specific particle evaluation. Results of this observational study showed a significant relationship between particle size and fecal scores two days later. The results demonstrated a cubic polynomial effect: Fecal scores improved with increasing of the proportion of particle size >19 mm at a low proportion of large particles, then it was maintained constant at intermediate proportion (10-15%) of large particles and finally increased again with a high proportion (up to 17%) of particle >19 mm.

American Journal of Animal and Veterinary Sciences
Volume 11 No. 1, 2016, 33-40

DOI: https://doi.org/10.3844/ajavsp.2016.33.40

Submitted On: 8 June 2015 Published On: 6 January 2016

How to Cite: Melendez, P. & Roy, E. (2016). The Association between Total Mixed Ration Particle Size and Fecal Scores in Holstein Lactating Dairy Cows from Florida, USA. American Journal of Animal and Veterinary Sciences, 11(1), 33-40. https://doi.org/10.3844/ajavsp.2016.33.40

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Keywords

  • Dairy Cattle
  • Particle Size
  • Fecal Score