Variability of cranial morphometrical traits in Suffolk Down Sheep

Abstract: The widespread use of measures and indices associated with the head for racial analysis suggests that such measures have a strong relationship with the underlying bone structure. Few studies analyse the variability of the bones of the head and the relationship with their external expressio...

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Autores principales:	de la Barra,Rodrigo, Carvajal,Andrés M., Martínez,María E.
Lenguaje:	Spanish / Castilian
Publicado:	Universidad Austral de Chile. Facultad de Ciencias Veterinarias 2020
Materias:	morphology sheep skull animal ethnology
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322020000100105
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spelling	oai:scielo:S0719-813220200001001052020-01-30Variability of cranial morphometrical traits in Suffolk Down Sheepde la Barra,RodrigoCarvajal,Andrés M.Martínez,María E. morphology sheep skull animal ethnology Abstract: The widespread use of measures and indices associated with the head for racial analysis suggests that such measures have a strong relationship with the underlying bone structure. Few studies analyse the variability of the bones of the head and the relationship with their external expression. The objective of this work was to identify and measure the magnitudes of the main skull parameters in Suffolk Down adult sheep. This study was carried out on sixteen adult Suffolk Down sheep skulls at INIA Butalcura. Their skeletons were obtained and digital morphometry was performed. Each skull was photographed from dorsal, ventral, lateral and nuchal views with a total of 28 parameters evaluated (10 dorsal, 5 ventral, 6 lateral and 6 nape). The results indicate that the externally observable variability in the cranial zone of a sheep cannot be extrapolated to the rest of the bony components of the cranial zone, either in length, width or height. It was observed that the variability of a cephalic dimension can be contrasted with the variability of individual bones that participate in a certain dimension as part of a plasticity adjustment mechanism independent of the genetic variability of each bone separately. The cranial dimensions are still useful in defining the productive potential of a sheep population; however, they should be taken cautiously for racial definitions, where the individual variability of the bones could be a better reflection of the genetic structure of the population and the dimensionality could be biased by adaptive plasticity.info:eu-repo/semantics/openAccessUniversidad Austral de Chile. Facultad de Ciencias VeterinariasAustral journal of veterinary sciences v.52 n.1 20202020-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322020000100105es10.4067/S0719-81322020000100105
institution	Scielo Chile
collection	Scielo Chile
language	Spanish / Castilian
topic	morphology sheep skull animal ethnology
spellingShingle	morphology sheep skull animal ethnology de la Barra,Rodrigo Carvajal,Andrés M. Martínez,María E. Variability of cranial morphometrical traits in Suffolk Down Sheep
description	Abstract: The widespread use of measures and indices associated with the head for racial analysis suggests that such measures have a strong relationship with the underlying bone structure. Few studies analyse the variability of the bones of the head and the relationship with their external expression. The objective of this work was to identify and measure the magnitudes of the main skull parameters in Suffolk Down adult sheep. This study was carried out on sixteen adult Suffolk Down sheep skulls at INIA Butalcura. Their skeletons were obtained and digital morphometry was performed. Each skull was photographed from dorsal, ventral, lateral and nuchal views with a total of 28 parameters evaluated (10 dorsal, 5 ventral, 6 lateral and 6 nape). The results indicate that the externally observable variability in the cranial zone of a sheep cannot be extrapolated to the rest of the bony components of the cranial zone, either in length, width or height. It was observed that the variability of a cephalic dimension can be contrasted with the variability of individual bones that participate in a certain dimension as part of a plasticity adjustment mechanism independent of the genetic variability of each bone separately. The cranial dimensions are still useful in defining the productive potential of a sheep population; however, they should be taken cautiously for racial definitions, where the individual variability of the bones could be a better reflection of the genetic structure of the population and the dimensionality could be biased by adaptive plasticity.
author	de la Barra,Rodrigo Carvajal,Andrés M. Martínez,María E.
author_facet	de la Barra,Rodrigo Carvajal,Andrés M. Martínez,María E.
author_sort	de la Barra,Rodrigo
title	Variability of cranial morphometrical traits in Suffolk Down Sheep
title_short	Variability of cranial morphometrical traits in Suffolk Down Sheep
title_full	Variability of cranial morphometrical traits in Suffolk Down Sheep
title_fullStr	Variability of cranial morphometrical traits in Suffolk Down Sheep
title_full_unstemmed	Variability of cranial morphometrical traits in Suffolk Down Sheep
title_sort	variability of cranial morphometrical traits in suffolk down sheep
publisher	Universidad Austral de Chile. Facultad de Ciencias Veterinarias
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322020000100105
work_keys_str_mv	AT delabarrarodrigo variabilityofcranialmorphometricaltraitsinsuffolkdownsheep AT carvajalandresm variabilityofcranialmorphometricaltraitsinsuffolkdownsheep AT martinezmariae variabilityofcranialmorphometricaltraitsinsuffolkdownsheep
_version_	1714207281374035968

Variability of cranial morphometrical traits in Suffolk Down Sheep

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