Central and peripheral oxytocin profiles during milking in ewes

Authors

  • João Carlos Bochini Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Patologia, São Paulo, SP
  • Renato Duarte Alvisi Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Patologia, São Paulo, SP
  • João Alberto Negrão Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Pirassununga, SP
  • Erica Engelberg Teixeira da Silva Hucke Fundação de Ensino Octávio Bastos, Centro Universitário, Faculdade de Medicina Veterinária, Laboratório de Fisiologia e Farmacologia, São João da Boa Vista, SP
  • Luciano Freitas Felicio Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Patologia, São Paulo, SP

DOI:

https://doi.org/10.11606/issn.1678-4456.v51i1p68-77

Keywords:

Catheterization, Milk ejection, Cerebrospinal fluid, Sheep, Lactation

Abstract

The present work investigated the possible relationship between central and peripheral oxytocin (OT) release during milking in experimental ewes. Ten multiparous ewes were divided into four groups according to milk ejection stimuli: exclusive machine milking (EM), mixed-management milking and suckling, lambs separated during the night and reunited with their mother after morning milking (MMS); mixed-management with manual milking (MMM), and exclusive suckling (ES) lambs also separated during the night. Simultaneous sampling of cerebrospinal fluid (CSF) and blood was performed during milking. The means, standard deviations, variation coefficients, and minimum and maximum CSF and plasma OT concentrations were the following, respectively: 257.88 ± 265.90 pg/ml, 103.11%, and 11.70 and 1000.00 pg/ml. No statistically significant correlations were found between OT concentrations in the CSF and plasma samples (EM: -0.26; ES: -0.19; MMM: 0.05; MMS: 0.04). The OT concentration in CSF was not influenced by milk ejection stimuli, although plasma OT was higher in the MMM (679.80 ± 25.63) and MMS (591.82 ± 30.56) groups compared with the EM and ES groups. Additionally, plasma OT concentrations were higher in the OME group (381.04 ± 22.09) compared with the AE group (218.82 ± 27.04). In conclusion, no positive correlations were found between central and peripheral OT concentrations during milking and suckling. Plasma OT concentrations differed as a function of milking management and had consequences for both milk ejection and production. Plasma but not CSF oxytocin concentrations were influenced by different milk ejection stimuli.

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Published

2014-08-09

How to Cite

Bochini, J. C., Alvisi, R. D., Negrão, J. A., Hucke, E. E. T. da S., & Felicio, L. F. (2014). Central and peripheral oxytocin profiles during milking in ewes. Brazilian Journal of Veterinary Research and Animal Science, 51(1), 68-77. https://doi.org/10.11606/issn.1678-4456.v51i1p68-77

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