Adsa Logo White Adsa Title White

Effects of shade provision on the behavior of prepartum dairy cows in southern Chile.

D. Cartes

Events

06-23-2020

Abstract:

259
Effects of shade provision on the behavior of prepartum dairy cows in southern Chile.
D. Cartes*1, F. Matamala1, A. Strappini2, P. Sep�lveda-Varas3. 1Escuela de Graduados, Facultad de Ciencias Veterinarias, Universidad Austral de Chile Valdivia, Chile, 2Instituto de Ciencia Animal, Facultad de Ciencias Veterinarias, Universidad Austral de Chile Valdivia, Chile, 3Instituto de Ciencias Cl�nicas Veterinarias, Facultad de Ciencias Veterinarias, Universidad Austral de Chile Valdivia, Chile.

The aim of this study was to investigate the effects of providing shade on the behavior of prepartum dairy cows managed outdoors and exposed to warm weather conditions in a temperate climate. Twenty-four multiparous Holstein prepartum dairy cows were randomly assigned to 6 groups approximately 21 d before their expected calving date based on BW, body condition score and parity. Each group (n = 4/group) were housed in open dirt corrals at the Experimental Dairy Farm of the Universidad Austral de Chile (Valdivia, Chile) during the summer months (January and February) until calving. Three groups had access to shade and 3 groups in adjacent corrals had no shade. Shade use and drinking time were daily recorded using scan sampling every 3 min during the hottest part of the day (1100 to 1800 h), whereas feeding time was daily recorded from 0830 to 2030 h. The daily lying time was measured with data loggers and rumination time was recorded using an automated monitoring system over the study period. Data were summarized by wk, compared between groups (shaded vs non-shaded) and analyzed using mixed linear models (R-Studio). On average, cows used shade during 47%, 46% and 20% of the observation period per day during wk 3, 2 and 1 before calving, respectively. During the morning, shaded cows spent more time feeding on wk 3 (72.6 vs. 59.4 min; P = 0.02), wk 2 (79.2 vs. 61.1 min; P = 0.003) and wk 1 (88.2 vs. 69.1 min; P = 0.006) before calving compared with non-shaded cows. Drinking time was lower in cows that had access to shade during the wk 3 (9.1 vs. 21.8 min; P = 0.004), wk 2 (11.6 vs. 20.4 min; P = 0.05) and wk 1 (11.0 vs. 20.8 min; P = 0.02) before calving compared with those without. Total time spent ruminating tended to be higher when cows had access to shade during the prepartum period compared with non-shaded cows (wk 3: 534 vs. 471 min/d; P = 0.09 / wk 2: 539 vs. 472 min/d; P < 0.08/ wk 1: 517 vs. 453 min/d; P = 0.07), but the daily lying time was not affected by shade treatment. These results confirm the importance of providing shade to prepartum dairy cows exposed to summer conditions under temperate regions. Project founded by FONDECYT 11170820

Keywords: shade, prepartum, dairy cow.

Biography: I am a DVM, M.Sc. and collaborate with some lessons of dairy production systems at the university. Currently, I am a doctorate student in Veterinary Science at the Universidad Austral of Chile. I am interested in the impact of climate conditions (in summer and winter) on behavior, energy balance, and health of transition dairy cows in pasture-based systems.