Hematological profile of beef cattle with divergent residual feed intake, following feed deprivation

Rodrigo da Costa Gomes, Renata Farinelli de Siqueira, Michael Alan Ballou, Tiago Roberto Stella, Paulo Roberto Leme

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The objective of this work was to characterize the hematological profiles of steers and bulls, according to residual feed intake (RFI), after feed deprivation. Twenty-month-old Nellore steers and bulls were fed feedlot diets for 70 and 56 days, respectively. RFI was calculated as the difference between actual feed intake and expected feed intake. More and less efficient steers and bulls, according to RFI, were subjected to 24 hours of food deprivation. Blood was sampled prior to and following the withdrawal period. Hematological analyses included total and differential white blood cell count, red blood cell count and morphology, and plasma glucose concentration. Variation in RFI did not influence plasma glucose concentration or blood cell profiles. Glucose concentrations in bulls decreased from 114 to 97 mg dL-1, but remained unchanged in steers, and the neutrophil: lymphocyte ratio increased from 0.39 to 0.57 following deprivation. Hematological profiles do not differ between more and less efficient steers and bulls, according to RFI.

Original languageEnglish
Pages (from-to)1105-1111
Number of pages7
JournalPesquisa Agropecuaria Brasileira
Volume46
Issue number9
DOIs
StatePublished - Sep 2011

Keywords

  • Bos indicus
  • Fasting
  • Feed efficiency
  • Leukocytes
  • Stress

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