Plasmatic urea levels influence on citogenetic parameters of wool-less rams

Authors

  • Carmen Neusa Martins Cortada Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Reprodução Animal, São Paulo, SP
  • Carlos de Sousa Lucci Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Nutrição e Produção Animal, Pirassununga, SP
  • Rodrigo Alonso Forero Forero Gonzalez Universidade de São Paulo; Faculdade de Medicina Veterinária e Zootecnia; Departamento de Reprodução Animal, São Paulo, SP
  • Carla Balzano de Mattos Universidade Paulista, São Paulo, SP
  • Maria Amélia Zogno Universidade de São Paulo; Faculdade de Medicina Veterinária e Zootecnia; Departamento de Nutrição e Produção Animal, Pirassununga, SP

DOI:

https://doi.org/10.1590/S1413-95962000000600005

Keywords:

Urea, Cytogenetics, Chromosomes, Rams

Abstract

The experiment was planned to verify the effects of increasing blood urea levels resulting from increasing urea in the diet on cytogenetic parameters of Santa Ines Brazilian breed rams (Ovis aries), aged 13 to 18 months. Eighteen animals were divided into three experimental treatments consisted of: diet A ration with nitrogen levels, according to NRC (1985); diet B - ration with a 133% higher level of nitrogen than diet A; and C- ration with a 166% higher level of nitrogen than diet A. The increase in nitrogen level was obtained by adding 20, 40 g of feed grade urea in treatments B and C, respectively. Blood was collected on a weekly basis to determine urea concentration. Blood was also collected from each animal, 60 days after desired diet urea levels were reached, to obtain a lymphocyte culture in order to count chromosome number and determine mitotic index. Increases in plasma urea level were observed (p < 0.0001), but did not affect the observed traits.

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Published

2000-12-01

Issue

Section

BASIC SCIENCES

How to Cite

Plasmatic urea levels influence on citogenetic parameters of wool-less rams. (2000). Brazilian Journal of Veterinary Research and Animal Science, 37(6), 449-452. https://doi.org/10.1590/S1413-95962000000600005