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Effect of carazolol on the oestrous behaviour and concentrations of luteinising hormone and steroids in lactating cows during the periovulatory period
  1. F. España, DMV, PhD1,
  2. C. C. Pérez-Marín, DMV, PhD2,
  3. J. Santiago-Moreno, DMV, PhD3 and
  4. A. Ziecik, DMV, PhD4
  1. 1 Centro de Investigación y Formación Agraria ‘Alameda del Obispo’, Junta de Andalucía, 14000, Córdoba, Spain
  2. 2 Department of Animal Medicine and Surgery, Faculty of Veterinary Medicine, University of Córdoba, 14014 Córdoba, Spain
  3. 3 Departamento de Reproducción Animal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (SGIT-INIA), 28040 Madrid, Spain
  4. 4 Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, 10-747 Olsztyn, Poland
  1. Correspondence to Dr Pérez-Marín

Abstract

Twelve multiparous, cycling, lactating Holstein-Friesian cows were synchronised with prostaglandin F and treated with either 2·5 mg carazolol or saline. There were no differences between the peripheral blood concentrations of oestradiol or progesterone, but in the cows treated with carazolol the periovulatory surge of luteinising hormone was delayed, and oestrous behaviour was expressed later than in the control cows.

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