ESTRUS DETECTION IN PELIBUEY EWES WITH ANDROGENIZED EWE OR VASECTOMIZED RAM

Authors

  • Rubén D. Martínez-Rojero
  • Silvino Carrillo-Pita
  • Moisés Rubio-Rubio

Keywords:

Sexual behavior, hormone response, vasectomized male, androgenized ewe

Abstract

The efficiency of a vasectomized ram versus an androgenized ewe for estrus detection in Pelibuey ewes, was compared. The experiment was carried out for 35 days (June-July of 1996) at the Colegio Superior Agropecuario del Estado de Guerrero. The ewe was androgenized with two intramuscular doses of 250 mg of Testosterone Enanthate given ten days apart. Thirty two adult ewes were subjected to estrus detection every day (from 07:00 to 07:30 hours). The detection was carried out for 15 minutes with the vasectomized male and 15 minutes with the androgenized ewe. The variables evaluated were the percentage of ewes detected in estrus by each animal, the interval between the introduction of the teaser and the detection of first estrus and the interval between each detected estrus. Statistical analysis was carried out by means of the z and Student t tests. Estrus detection was higher (p

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Published

31-12-1999

Issue

Vol. 33 No. 4 (1999): 1999-oct-dic

Section

Notes

License

Agrociencia is published every 45 days, in an English format, and it is edited by the Colegio de Postgraduados. Mexico-Texcoco highway Km. 36.5, Montecillo, Texcoco, Estado de México, CP 56264, Telephone (52) 5959284427. www.colpos.mx. Editor-in-Chief: Dr. Fernando Carlos Gómez Merino. Rights Reserved for Exclusive Use: 04-2021-031913431800-203, e-ISSN: 2521-9766, granted by the National Institute for Author Right.