Effect of solar radiation on Holstein heifers’ physiological variables and grazing behavior
نویسندگان
چکیده
The objective was to assess the physiological and behavioral variables of pasture-raised Holstein heifers on basis their coat color. Eight were used, four with black coat, white coat. In morning afternoon periods, measured, namely respiratory rate (RR, mov min. -1), rectal temperature (TR, ºC), surface (TS, ºC). behavior analysis considered site (sun or shade), position (standing lying down), activities (idleness, rumination, grazing, others). data assessed through variance, significance, Tukey’s test at 5%, while using Chi-squared (SAS Software). There a difference for all heifers’ as function color (p < 0.0001) period 0.0001), ones showing greater results than in 0.0001). Grazing is reduced during hottest hours day. We conclude that solar radiation changes grazing heifers.
منابع مشابه
Physiological performance and grazing behavior of Senepol, Brahman and Holstein heifers in Puerto Rico
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ژورنال
عنوان ژورنال: Acta Scientiarum. Animal Sciences
سال: 2023
ISSN: ['1806-2636', '1807-8672']
DOI: https://doi.org/10.4025/actascianimsci.v45i1.59307