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dc.contributor.author
Lopez Armengol, Maria Fernanda  
dc.contributor.author
Sabino, G. A.  
dc.contributor.author
Forquera, J. C.  
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de la Casa, Antonio Carlos  
dc.contributor.author
Aisen, Eduardo Gabriel  
dc.date.available
2018-03-02T20:25:57Z  
dc.date.issued
2015-03  
dc.identifier.citation
Lopez Armengol, Maria Fernanda; Sabino, G. A.; Forquera, J. C.; de la Casa, Antonio Carlos; Aisen, Eduardo Gabriel; Sperm head ellipticity as a heat stress indicator in Australian Merino rams (Ovis aries) in Northern Patagonia, Argentina; Elsevier Science Inc; Theriogenology; 83; 4; 3-2015; 553-559  
dc.identifier.issn
0093-691X  
dc.identifier.uri
http://hdl.handle.net/11336/37736  
dc.description.abstract
In Northern Patagonia, Argentina, the ovine mating season starts on March 15, which is the time when rams are submitted to summer temperatures. This study assessed the adaptability of 12 Australian Merino rams, six unshorn and six shorn, half of which were treated in a heat chamber for fivedays (09.00hours to 17.00hours) that gradually reached 40°C. In an attempt to quantify the effects of heat stress on sperm head morphology, ellipticity was analyzed to establish the relationship between the distributions of subpopulations, light hours, temperature and humidity. Ellipticity was measured on 9224 sperm heads that were obtained over 12 weeks starting in the summer time. Four sperm head subpopulations (S) were identified by comparison with a sperm head population of ejaculates obtained in the late breeding season without the effect of heat stress (S1=heads with ellipticity≥2.00; S2=sperm head with range of ellipticity between 1.80 and 1.99; S3=sperm head with range of ellipticity from 1.60 to 1.79; and S4=sperm head with range of ellipticity from 1.30 to 1.59). The variable sperm head ellipticity for each ejaculate was expressed as the means and frequencies of subpopulation. The results demonstrate changes in ram sperm head ellipticity in different conditions (control/treated, unshorn/shorn) throughout the experiment (P<0.05). Treated shorn rams had a higher mean ellipticity and frequency of elliptical heads (mean ellipticity value=2.06 and S1 frequency=76.35%), peaking in the seventh week posttreatment (on the basis of the action of heat stress on seminiferous tubules). According to this study, unshorn rams were better adapted to heat stress than the shorn ones.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Elsevier Science Inc  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-nd/2.5/ar/  
dc.subject
Heat Stress  
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Merino Ram  
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Sperm Head Ellipticity  
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Unshorn/Shorn  
dc.subject.classification
Otras Producción Animal y Lechería  
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Producción Animal y Lechería  
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CIENCIAS AGRÍCOLAS  
dc.title
Sperm head ellipticity as a heat stress indicator in Australian Merino rams (Ovis aries) in Northern Patagonia, Argentina  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2018-03-02T14:19:39Z  
dc.journal.volume
83  
dc.journal.number
4  
dc.journal.pagination
553-559  
dc.journal.pais
Estados Unidos  
dc.description.fil
Fil: Lopez Armengol, Maria Fernanda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigaciones En Toxicología Ambiental y Agrobiotecnología del Comahue. Instituto de Biotecnología Agropecuaria del Comahue | Universidad Nacional del Comahue. Facultad de Cs.agrarias. Centro de Investigaciones En Toxicología Ambiental y Agrobiotecnología del Comahue. Instituto de Biotecnología Agropecuaria del Comahue; Argentina  
dc.description.fil
Fil: Sabino, G. A.. Universidad Nacional del Comahue. Facultad de Economía y Administración; Argentina  
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Fil: Forquera, J. C.. Universidad Nacional del Comahue. Facultad de Ciencias Agrarias; Argentina  
dc.description.fil
Fil: de la Casa, Antonio Carlos. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Aisen, Eduardo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Centro de Investigaciones En Toxicología Ambiental y Agrobiotecnología del Comahue. Instituto de Biotecnología Agropecuaria del Comahue | Universidad Nacional del Comahue. Facultad de Cs.agrarias. Centro de Investigaciones En Toxicología Ambiental y Agrobiotecnología del Comahue. Instituto de Biotecnología Agropecuaria del Comahue; Argentina  
dc.journal.title
Theriogenology  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.theriogenology.2014.10.020  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0093691X14005731