Evaluation of two formulations of progesterone in HeatSynch protocols in lactating Holstein cows in a pasture-based system

Authors

  • M. Martínez-Barbitta Programa de Posgrados, Facultad de Veterinaria, Universidad de la Republica, Montevideo, Uruguay.
  • J. Gil Departamento Producción en los Sistemas Pecuarios, Facultad de Veterinaria, Universidad de la Republica, Paysandú, Uruguay.
  • G. Costa Doctor en Ciencias Veterinarias, Ejercicio Liberal, Uruguay.
  • I. Pombo Doctor en Ciencias Veterinarias, Ejercicio Liberal, Uruguay.
  • J. Peñagaricano Doctor en Ciencias Veterinarias, Ejercicio Liberal, Uruguay.
  • M. Lutz Doctor en Veterinaria, Ejercicio Liberal, Paysandú y Río Negro, Uruguay.
  • A. Freire Doctor en Veterinaria, Ejercicio Liberal, Paysandú y Río Negro, Uruguay.
  • D. Cavestany Departamento de Reproducción, Facultad de Veterinaria, Universidad de la República, Lasplaces 1620, 11600 Montevideo, Uruguay.

Keywords:

Dairy cows, Progesterone, Estrus synchronization, Postpartum anestrus

Abstract

To evaluate two formulations of progesterone (inject­able: MAD-4, or intravaginal: DIV) included in the estrus synchronization protocol HeatSynch, 377 lactating Hol­stein cows, primiparous and multiparous, cycling and in anestrus, located in three dairies were used. The Protocol consisted of: Day 0: GnRH and administration of MAD-4 or DIV; Day 7: Prostaglandin (PG); Day 8: (BE) Estradiol Benzoate; Day 9: heat detection and AI; Day 10: Fixed Time Artificial Insemination (FTAI) to cows that did not show heat; Day 45: pregnancy diagnosis using ultrasound. Milk samples were obtained at Days - 7 and 0 for deter­mination ovarian activity according to levels of progester­one. First service pregnancy rates were: 20.5% in Farm 1, 30.8% in Farm 2, and 43.3% in Farm 3 (P<0.05). Fertility of treatment was not affected by progesterone formulation (DIV: 33.0%, MAD-4: 33.1%; P>0.01) cyclicity (Cycling: 32.3%, Anestrus: 35.3%; P>0.01) or parity (Primiparous: 36.1%, Multiparous: 30.2%; P>0.01). An interaction was found between farm and cyclicity (P<0.05). Pregnancy rate was lower in Primiparous of farm 1 than in farms 2 and 3 (12.9% vs. 49.8% and 33.3%; P<0.05). Bases on the lack of differences between treatments it was concluded that it is possible to replace intravaginal devices with injectable progesterone, as a presentation easier to apply and that does not generate wastes of hormonal pollutants.

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Published

2015-12-01

How to Cite

Martínez-Barbitta, M., Gil, J., Costa, G., Pombo, I., Peñagaricano, J., Lutz, M., … Cavestany, D. (2015). Evaluation of two formulations of progesterone in HeatSynch protocols in lactating Holstein cows in a pasture-based system. Veterinaria (Montevideo), 51(200), 26–35. Retrieved from https://revistasmvu.com.uy/index.php/smvu/article/view/116

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Original Articles

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