Tropical Animal Health and Production

, Volume 48, Issue 4, pp 699–703 | Cite as

Lambing rate and prolificacy in inseminated hair sheep treated with bovine somatotropin

  • José Maria Carrera-Chávez
  • Joel Hernández-Cerón
  • Carlos Fernando Aréchiga-FloresEmail author
  • Marco Antonio López-Carlos
  • Raúl Renato Lozano-Domínguez
  • Andrés Quezada-Casasola
  • Francisco Guadalupe Echavarría-Cháirez
Regular Articles


This study evaluated whether the administration of 50 and 100 mg bovine somatotropin (bST) at the start of estrous synchronization and at the time of artificial insemination improves lambing rate and prolificacy in hair sheep. Four hundred eighty adult hair ewes (Pelibuey, Blackbelly, Dorper, Katahdin, and their crosses) were synchronized with intravaginal sponge containing 40 mg of fluorogestone acetate. On the day of sponge insertion, ewes were assigned to three treatments: the bST-100 treatment (n = 156) received 100 mg bST at the start of synchronization (d 0) and at the time of insemination (d 14), the bST-50 treatment (n = 159) received 50 mg bST in the same schedule as the previous group, and the control (n = 165) did not receive any bST. Lambing rate and percentage of multiple births were analyzed using the GENMOD procedure of SAS. Prolificacy data were analyzed using the MIXED procedure of SAS. The IGF-1 and insulin concentrations were analyzed with ANOVA for repeated measures. The bST application did not affect the lambing rate (P = 0.06). The proportion of ewes with multiple births (P = 0.01) and prolificacy (P = 0.04) were higher in the bST-50 (54.3 % and 1.57 ± 0.1) than the bST-100 (18.2 % and 1.25 ± 0.1) and control (33.3 % and 1.28 ± 0.1) groups. The IGF-1 and insulin concentrations were higher (P < 0.05) in the bST-treated groups, but the insulin concentration was higher (P = 0.001) in the bST-100 group than in the bST-50 group. The administration of 50 or 100 mg bST at the start of synchronization and at the time of artificial insemination does not increase lambing rate. However, the dose of 50 mg increased the proportion of multiple births and prolificacy.


Artificial insemination Sheep Somatotropin Lambing rate Prolificacy 



This study was partly supported by the Fundación Produce Zacatecas A.C. (Zacatecas, México) (Project number 32-2010-0013). The authors thank participating farmers and MSD Salud Animal México for the donation of somatotropin (Boostin-S) and Dr. Eugenio Villagómez Amezcua from Centro Nacional de Investigación Disciplinaria en Microbiología—Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias for his assistance in the determination of hormone levels.

Compliance with ethical standards

Statement of animal rights

All experimental procedures were conducted according to protocols approved by the Unidad Académica de Medicina Veterinaria y Zootecnia de la Universidad Autónoma de Zacatecas Animal Care and Use Committee.

Conflict of interest

The authors declare that they have no competing interests, and this document is their original research work.


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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • José Maria Carrera-Chávez
    • 1
    • 2
  • Joel Hernández-Cerón
    • 3
  • Carlos Fernando Aréchiga-Flores
    • 1
    Email author
  • Marco Antonio López-Carlos
    • 1
  • Raúl Renato Lozano-Domínguez
    • 1
  • Andrés Quezada-Casasola
    • 2
  • Francisco Guadalupe Echavarría-Cháirez
    • 1
  1. 1.Unidad Académica de Medicina Veterinaria y ZootecniaUniversidad Autónoma de ZacatecasEl Cordovel Enrique EstradaMéxico
  2. 2.Departamento de Ciencias Veterinarias, Instituto de Ciencias BiomédicasUniversidad Autónoma de Ciudad JuárezCiudad JuárezMéxico
  3. 3.Facultad de Medicina Veterinaria y ZootecniaUniversidad Nacional Autónoma de MéxicoMéxico DFMéxico

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