Conducta estral circanual en ovejas Pelibuey bajo condiciones áridas del noroeste de México
2015
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). Compared with others months, a higher (P 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.
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