Physiological and behavioural response of two dairy cows’ genotypes during summertime in the central region of Chile

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dc.contributor.authorArias, Rodrigo A.
dc.contributor.authorHerrera, Camila
dc.contributor.authorLarraín, Rafael
dc.contributor.authorGonzález, Fernando
dc.contributor.authorMader, Terry L.
dc.contributor.authorVelásquez, Alejandro
dc.date2018
dc.date.accessioned2019-11-12T18:20:26Z
dc.date.available2019-11-12T18:20:26Z
dc.date.issued2019-11-12
dc.description.abstractHeat stress has been recognised as a serious problem in dairy farms. The study goal was to assess the effects of climatic conditions on physiological and behavioural responses of dairy cows in Central Chile. Data of tympanic temperature (TT), panting score, respiration rate (RR), and shade utilization of cows from two genotypes, Holstein (H) and Holstein x Montbeliarde (HM), were collected twice per day (AM/PM) during three periods of the summer season in Central Chile. Moreover, three thermal comfort indices: Comprehensive climate index (CCI), temperature humidity-index (THI), and adjusted THI were estimated using meteorological data. The hour of each day was classified as “Normal” or “Stressful” based on CCI threshold of 25 °C. Statistical analysis included ANOVA, repeated measures analysis and Chi square test (a=0.05). There was an interaction of genotype x CCI condition x period (P=0.0026) with the highest TT of both genotypes under a stressful condition within each period. In addition, interactions of genotype x hour (P<0.0001) and genotype x CCI condition (P<0.0002) were also observed. The HM cows showed greater TT than H cows in both CCI conditions. The RR was higher during the afternoon and a greater proportion of cows used shade at “Mild” and “Moderate” CCI categories (P<0.001). Both genotypes showed some degree of heat stress, but cool nights and shade seem to be enough to allow to cows’ cope with the challenging diurnal conditions observed in the summer season. A study of these effects on milk production is necessary to confirm or discard the previous.es_ES
dc.formatPDFes_ES
dc.identifier.citationAustral journal of veterinary sciences, Vol. 50, N°1, 9-14, 2018
dc.identifier.doi10.4067/S0719-81322018000100103es_ES
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/2077
dc.language.isoenes_ES
dc.sourceAustral journal of veterinary scienceses_ES
dc.subjectTemperatura timpánicaes_ES
dc.subjectComodidad térmicaes_ES
dc.subjectRitmo respiratorioes_ES
dc.subjectEstrés por calores_ES
dc.titlePhysiological and behavioural response of two dairy cows’ genotypes during summertime in the central region of Chilees_ES
dc.typeArtículo de Revistaes_ES
uct.catalogadorpbces_ES
uct.comunidadRecursos Naturaleses_ES
uct.indizacionISI - Science Citation Indexes_ES
uct.indizacionSCIELOes_ES
uct.indizacionSCOPUSes_ES
uct.nucleosNúcleo en Producción Alimentariaes_ES
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