Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus

Sexual behaviour decreases in sheep breeds of temperate origin during long day length, while tropical rams have been reported to be almost aseasonal. However, changes in sexual behaviour have not been compared between these two breeds, and besides day length no further analysis has been made for oth...

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Autores principales:	Clemente,N, Orihuela,A, Flores-Pérez,I, Aguirre,V, Valencia,J
Lenguaje:	English
Publicado:	Facultad de Ciencias Veterinarias, Universidad Austral de Chile 2013
Materias:	Saint Croix Suffolk sexual behaviour seasonal reproduction
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0301-732X2013000100011
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spelling	oai:scielo:S0301-732X20130001000112013-05-24Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrusClemente,NOrihuela,AFlores-Pérez,IAguirre,VValencia,J Saint Croix Suffolk sexual behaviour seasonal reproduction Sexual behaviour decreases in sheep breeds of temperate origin during long day length, while tropical rams have been reported to be almost aseasonal. However, changes in sexual behaviour have not been compared between these two breeds, and besides day length no further analysis has been made for other environmental factors. The purpose of this preliminary study was to evaluate the sexual behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long day length, while being exposed to Suffolk ewes in seasonal anestrus, to avoid sexual feedback from the females. In the first group (T1), three Suffolk males were exposed continuously to females during 13 days, while in the second group (T2) three Saint Croix rams were used. Saint Croix rams displayed more (P < 0.05) vocalizations and sniffs than Suffolks (60.6 ± 12.4 vs. 26.8 ± 5.4 and 141.9 ± 17.1 vs. 62.5 ± 11.2, frequencies/h, respectively). Sexual behaviour decreased (P < 0.01) in Suffolk males as the experiment progressed (y = -1.72x + 42.76; P < 0.05) suggesting habituation to the females. In addition, sexual activity also decreased during noon hours in a pattern that was highly correlated (r = -0,8; P < 0.05) with sunlight, while Saint Croix rams maintained a more constant pattern of sexual activity among and within days. It is concluded that at medium latitudes (19º N), sexual behaviour in Suffolk compared to Saint Croix rams during long days decreases as a consequence of the solar radiation and habituation to the anestrous ewes.info:eu-repo/semantics/openAccessFacultad de Ciencias Veterinarias, Universidad Austral de ChileArchivos de medicina veterinaria v.45 n.1 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0301-732X2013000100011en10.4067/S0301-732X2013000100011
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Saint Croix Suffolk sexual behaviour seasonal reproduction
spellingShingle	Saint Croix Suffolk sexual behaviour seasonal reproduction Clemente,N Orihuela,A Flores-Pérez,I Aguirre,V Valencia,J Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus
description	Sexual behaviour decreases in sheep breeds of temperate origin during long day length, while tropical rams have been reported to be almost aseasonal. However, changes in sexual behaviour have not been compared between these two breeds, and besides day length no further analysis has been made for other environmental factors. The purpose of this preliminary study was to evaluate the sexual behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long day length, while being exposed to Suffolk ewes in seasonal anestrus, to avoid sexual feedback from the females. In the first group (T1), three Suffolk males were exposed continuously to females during 13 days, while in the second group (T2) three Saint Croix rams were used. Saint Croix rams displayed more (P < 0.05) vocalizations and sniffs than Suffolks (60.6 ± 12.4 vs. 26.8 ± 5.4 and 141.9 ± 17.1 vs. 62.5 ± 11.2, frequencies/h, respectively). Sexual behaviour decreased (P < 0.01) in Suffolk males as the experiment progressed (y = -1.72x + 42.76; P < 0.05) suggesting habituation to the females. In addition, sexual activity also decreased during noon hours in a pattern that was highly correlated (r = -0,8; P < 0.05) with sunlight, while Saint Croix rams maintained a more constant pattern of sexual activity among and within days. It is concluded that at medium latitudes (19º N), sexual behaviour in Suffolk compared to Saint Croix rams during long days decreases as a consequence of the solar radiation and habituation to the anestrous ewes.
author	Clemente,N Orihuela,A Flores-Pérez,I Aguirre,V Valencia,J
author_facet	Clemente,N Orihuela,A Flores-Pérez,I Aguirre,V Valencia,J
author_sort	Clemente,N
title	Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus
title_short	Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus
title_full	Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus
title_fullStr	Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus
title_full_unstemmed	Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus
title_sort	reproductive behaviour of saint croix and suffolk rams at medium latitudes (19º n) during long days while being exposed to suffolk ewes in seasonal anestrus
publisher	Facultad de Ciencias Veterinarias, Universidad Austral de Chile
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0301-732X2013000100011
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Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus

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