Effect of Estradiol Benzoate on the Size of Follicle and Corpus Luteum of Holstein Cows Treated with D-Cloprostenol.

  • Manuel E. Soria Parra Faculty of Agricultural Sciences, University of Cuenca, Campus Yanuncay, Cuenca, Ecuador.
  • Johnny Narváez Terán Faculty of Agricultural Sciences, University of Cuenca, Campus Yanuncay, Cuenca, Ecuador.
  • Carlos Torres Inga Faculty of Agricultural Sciences, University of Cuenca, Campus Yanuncay, Cuenca, Ecuador.
  • Silvana Méndez Álvarez Faculty of Agricultural Sciences, University of Cuenca, Campus Yanuncay, Cuenca, Ecuador.
  • Carlos A. Soria Parra Faculty of Agricultural Sciences, University of Cuenca, Campus Yanuncay, Cuenca, Ecuador.
Palabras clave: body condition, hormones, estrus cycle, reproduction

Resumen

The effect of two treatments, farms, and body  shape on the size of the follicle and  Corpus Luteum  were evaluated.
D-Cloprostenol (150 ug) was used in one of the treatments; in the other,  D-Cloprostenol (150 ug) and Estradiol Ben-zoate (1 mg), were used. Two groups of 32 Holstein dairy cows each, from the Nero and Irquis farms in Cuenca, Ec-uador, were set up.  Body condition  (2.75-3.50) was considered. The calving number was 1-6; the farms,  Irquis and
Nero; and animal age, 3-10 years. Ultrasound scanning was used on days 0; 3 and 7, in order to measure the  Luteum
first, then the  dominant ovarian follicle, and finally, the Corpus Luteum.  Factor analysis of variance  was  performed.
No significant differences were found for follicle size due to any factors; nor due to interaction.  Concerning luteum,
significant differences (P < 0.05) were observed for the treatments and for the farm. The values were 0.33 cm higher
for the treatment with Benzoate, and 0.36 cm,  at  Irquis, in comparison to Nero. The treatment with Benzoate, along
with better husbandry at Irquis played a critical role in the appearance and evolution of the luteum.

Citas

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Publicado
2017-06-13
Sección
Salud Animal