CIVETAN   23983
CENTRO DE INVESTIGACION VETERINARIA DE TANDIL
Unidad Ejecutora - UE
artículos
Título:
Estrés por calor: su efecto sobre el estado inmunológico de las vacas lecheras
Autor/es:
MARTÍNEZ CUESTA, LUCÍA; MOTA- ROJAS, DANIEL; LENDEZ, PAMELA ANAHI; VATER, ADRIAN ALEJANDRO; DOLCINI, GUILLERMINA LAURA; NIETO FARIAS, MARIA VICTORIA; GHEZZI, MARCELO DANIEL; CERIANI, MARIA CAROLINA
Revista:
Revista de Medicina Veterinaria
Editorial:
Sociedad de Medicina Veterinaria (SOMEVE) de la República Argentina,
Referencias:
Lugar: CABA; Año: 2020 vol. 101 p. 7 - 13
ISSN:
1852-771X
Resumen:
Heat stress constitutes a major challenge for dairyindustry. European breed cattle (Bos taurus) areadapted to low temperatures, with morpho-physiologicalcharacteristics that make them vulnerable to heatstress. The increase in global temperature, the numberof high production dairy cows, and the intensificationof productive systems might affect their productiveand reproductive potential, and immune system. Forthe first time, expression pattern of TNF-α mRNA andits receptors is evaluated in animals exposed to heatstress. Expression of this inflammatory cytokine andits receptors in Holando Argentino cows from Tandil,Argentina, was evaluated by real time PCR (qPCR).Animals were evaluated throughout a year, in threeperiods: spring (n=15), summer (n=14) and autumn(n=11). Data from the Sistema Meteorológico Nacionalfrom Argentina were used to estimate the Humidityand Temperature Index (HTI). During the summer, 609events were analyzed, and 471 (77.33%) exceeded thecritical threshold of 72. In spring, 6 out of 537 analyzedevents (1.11%) exceeded the threshold, and duringthe autumn season none of the 993 events had anHTI>72. Our results show a decrease in TNF-α and itsreceptors mRNA expression in animals in environmentalconditions compatible with distress along 8,5±1,09 dailyhours. This discomfort provokes negative effects inimmune system that could affect vaccine response andincrease susceptibility to opportunistic infections.