Abstract #379

# 379
Dynamics of rumination, activity, and milk yield around hoof trimming.
Sushil Paudyal*1, Fiona Maunsell2, Pablo Pinedo1, 1Colorado State University, Fort Collins, CO, 2University of Florida, Gainesville, FL.

Preventive and therapeutic hoof trimming in dairy cattle is associated with stress and may result in temporary alterations in behavior and production. Our objective was to characterize the dynamics of rumination time (RT), activity (ACT), and milk yield (MY) in animals submitted for hoof trimming (HT) during early lactation. A total of 198 multiparous Holstein cows from the University of Florida Dairy Unit, were enrolled and monitored until 60 d in milk for daily RT (min), ACT (min), and MY (kg). Cows submitted for HT were differentiated as receiving corrective interventions (TRM) or as being diagnosed with a lameness disorder (LAM). Cows not submitted to HT were considered controls (CON). A rolling index was created for each parameter, based on the deviation from a specific day (d 0), relative to the average reading for the previous 3 to 5 d, standardized by this average (−3 to −5d). To determine the effect of HT, the index was calculated daily, considering d 0 at 5 different points (d of HT to d 4 post-treatment). Data were examined by repeated measures analysis, with the index value as outcome and the foot condition at HT as the independent variable, adjusting for DIM and parity. No significant differences were determined for RT index between groups. For TRM animals, the index on daily RT decreased at d 1 after HT to subsequently increase to reach the level of CON animals at d 4. In LAM animals, the RT index started to increase on the day of HT and surpassed the CON animals at d 3. The ACT index for TRM animals started to increase on the day of treatment and surpassed the CON animals on d 2 (P = 0.002). The ACT index for LAM animals followed a similar pattern; however, ACT indices were only different from the CON group on the day of treatment (P = 0.02). The ACT index surpassed the CON animals on d2 after treatment and remained similar to CON animals until d 4 post-treatment. Average MY index was greater in TRM animals than in CON animals on the day of HT (P < 0.001), whereas in the LAM animals, MY index was only significantly greater than in CON group at d 3 and d 4 after treatment. We conclude that the dynamics of RT, ACT, and MY around HT are specific and require different recovery times to reach normal levels.

Key Words: hoof trimming, rumination, activity