Circannual estrous behavior in Pelibuey ewes under aridconditions of Northwestern of Mexico
In order to determine the circannual estrus behavior of Pelibuey ewes under arid conditions of Northwestern Mexico(32o NL), 22 adult ewes were maintained in confinement conditions with constant feeding during one year. Daily,morning and afternoon, the ewe group was exposed to one of three ram fitted with an apron to detect estrusbehavior. Annual averages of temperature, relative humidity and temperature-humidity index were 25.3±8.1 ºC,33.1±10.7 % and 72.0±8.4 units, respectively. Monthly percentage of ewes in estrus was lower (P<0.05) fromJanuary to June than from July to December. The 100 % of ewes showed estrus signs in each month from July toDecember (P>0.05). Compared with others months, a higher (P<0.05) percentage of ewes showed shorter estrus(<24 h) in February and March, contrarily, the proportion of ewes with longer estrus (>36 and <48 h) was higher(P<0.05) in June and August. In conclusion, under arid-dry conditions of Northwestern Mexico, Pelibuey ewesdecrease their estrus activity from January to June, and high environmental temperatures of summer are not a factoraffecting the estrus presence in this sheep breed.
| Main Authors: | , , , , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias
2015
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| Online Access: | https://cienciaspecuarias.inifap.gob.mx/index.php/Pecuarias/article/view/4027 |
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