Thermal comfort and grazing behavior of Girolando heifers in integrated crop-livestock (ICL) and crop-livestock-forest (ICLF) systems
| Autor: | P. G. da Cruz, H. M. Veit, G. A. de Carvalho, E. C. de Souza, F. R. F. da Silva, A. K. Salman, E. Schmitt |
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| Rok vydání: | 2019 |
| Předmět: |
040301 veterinary sciences
Agrosilvopastoral Crop livestock Pasture Crossbreed Heat stress heat stress 0403 veterinary science wellbeing Animal science Grazing lcsh:SF1-1100 geography geography.geographical_feature_category Wellbeing business.industry 0402 animal and dairy science agrosilvopastoral Thermal comfort Humidity 04 agricultural and veterinary sciences 040201 dairy & animal science Air temperature Environmental science Animal Science and Zoology Livestock lcsh:Animal culture business Food Science |
| Zdroj: | Acta Scientiarum: Animal Sciences, Vol 41, Iss 1, Pp e46483-e46483 (2019) Acta Scientiarum. Animal Sciences, Volume: 41, Article number: e46483, Published: 04 JUL 2019 Acta Scientiarum. Animal Sciences; Vol 41 (2019): Publicação Contínua; e46483 Acta Scientiarum. Animal Sciences; v. 41 (2019): Publicação Contínua; e46483 Acta Scientiarum. Animal Sciences Universidade Estadual de Maringá (UEM) instacron:UEM |
| ISSN: | 1807-8672 1806-2636 |
| DOI: | 10.4025/actascianimsci.v41i1.46483 |
| Popis: | To compare the integrated crop-livestock-forest (ICLF) and crop-livestock (ICL) systems in relation to thermal comfort and grazing behavior of Girolando heifers, a 2 × 2 crossover trial (two system and two periods) was carried out with eight ¾ Holstein × ¼ Gyr heifers in Xaraés–palisade grass pasture under intermittent stocking with 10 days of occupation period and 20 days of resting. In ICLF, crown cover of eucalyptus planted in rows was 65% at the beginning of the experiment. Animal behavior was assessed through bioacoustics by recording heifers’ sounds for 48 hours. Concomitantly, heifers’ internal temperature (IT,°C) was recorded every 10 min using data logger thermometers adapted to hormone-free intravaginal devices. Air temperature and humidity data were collected by thermohygrometers located in the center of ICLF and ICL for calculating Temperature–Humidity Index (THI). According to THI values, ICLF and ICL did not vary in terms of thermal comfort. However, THI indicated moderate stress (82.26±4.40) during day (06:00 to 17:59h) and mild stress (75.76±4.38) at night (18:00 to 05:59h) in both systems. During day, heifers from ICL had significantly (p < 0.05) higher IT (39.51±0.56oC) than those from ICLF (39.41±0.56oC); the former spent more time grazing and less time drinking water in ICLF (581.35±30.1 and 4.87±1.09 min, respectively) when compared with those from ICL (436.88±28.1 and 10.25±1.09 min, respectively). Therefore, although thermal comfort index did not vary between the systems, under moderate stress, crossbred heifers have lower internal temperatures, resulting in longer diurnal grazing and shorter water drinking time in Eucalyptus-shaded pastures. |
| Databáze: | OpenAIRE |
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