Two protocols to synchronize the oestrus of lactating ewes using progestogens

Authors

  • Saúl Espinoza Molina Universidad Nacional del Centro del Perú, Instituto General de Investigación, El Tambo, Huancayo, Perú https://orcid.org/0000-0002-6070-5155
  • Gabriela Espinoza Rojas Universidad Nacional del Centro del Perú, Instituto General de Investigación, El Tambo, Huancayo, Perú
  • Chessyra Ticona Huaroco Programa de ganadería de la Estación Experimental Agropecuaria de Satipo, Universidad Nacional del Centro del Perú, Río Negro, Satipo https://orcid.org/0000-0002-0997-9353
  • Mario CCari Huayta Instituto Nacional de Innovación Agraria (INIA), Estación Experimental Agraria Santa Ana, El Tambo, Huancayo, Perú https://orcid.org/0000-0003-4713-0577
  • Uri Harold Pérez Guerra Universidad Nacional del Altiplano, Facultad de Medicina Veterinaria y Zootecnia, Laboratorio de Reproducción Animal, Puno, Perú https://orcid.org/0000-0001-8321-8651
  • Danny Julio Cruz Universidad Peruana Los Andes, Facultad de Ciencias de la Salud, Escuela Profesional de Medicina Veterinaria y Zootecnia, Huancayo, Perú https://orcid.org/0000-0003-0849-0051

DOI:

https://doi.org/10.15381/rivep.v33i6.24095

Keywords:

lactating sheep, temporary weaning, synchronization protocol, short, conventional

Abstract

The aim of this study was to evaluate two protocols for oestrus synchronization using intravaginal progestogens. In the study, 64 ewes with lambs at foot of 30-40 days old were used. The animals were assigned to two groups: (T1): application of a short synchronization protocol (6 days) with suppression of suckling for 30 hours (n1=32) and (T2): application of a long or conventional protocol (12 days) with suppression of suckling for 54 hours (n2=32). Fixed-time artificial insemination (FTAI) was performed with refrigerated semen through the transcervical route at the end of temporary weaning. The pregnancy rate without heat return at 16-17 days post-FTAI, pregnancy rate at 41 days by ultrasound, pregnancy rate at 90 days by balloting and type of delivery were determined. The rate of non-return to oestrus at 15-17 days post-FTAI was 81.25% for T1 and 87.50% for T2 (p<0.05). Likewise, the pregnancy percentages by ultrasound and by balloting were statistically similar between treatments. The twin birth rate was slightly, but not significantly different in T2 (26.92%) than in T1 (19.2%). The results show that when applying a short synchronization protocol, similar results are achieved as when applying the conventional synchronization protocol and with the advantage that it is carried out in less time.

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Published

2022-12-22

Issue

Vol. 33 No. 6 (2022)

Section

Artículos Primarios

License

Copyright (c) 2022 Saúl Espinoza Molina, Gabriela Espinoza Rojas, Chessyra Ticona Huaroco, Mario CCari Huayta, Uri Harold Pérez Guerra, Danny Julio Cruz

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

AUTHORS RETAIN THEIR RIGHTS:

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How to Cite

Espinoza Molina, S., Espinoza Rojas, G., Ticona Huaroco, C., CCari Huayta, M., Pérez Guerra, U. H., & Julio Cruz, D. (2022). Two protocols to synchronize the oestrus of lactating ewes using progestogens. Revista De Investigaciones Veterinarias Del Perú, 33(6), e24095. https://doi.org/10.15381/rivep.v33i6.24095