Resumen

BARRIOS, Mariana et al. Leucogram and protein profile in dual purpose crossbred calves, resistant and susceptible to natural infection by gastrointestinal nematodes. Zootecnia Trop. [online]. 2011, vol.29, n.3, pp.313-322. ISSN 0798-7269.

This study was carried out to evaluate white blood cell count alterations (cell component) and the protein profile (humoral component) in dual purpose calves, categorized as resistant and susceptible, after exposure to infested pastures. The study was conducted in 75 crossbred calves of both sexes (37 males and 33 females) from to dual-purpose operating units of the municipality Manuel Monge, Yaracuy state of Venezuela. Animals were divided into three age groups: ≤ 60 days, from 61 to 210 days, > 210 days and grouped according to their racial dominance as: Cebu, European, Carora. According to number of strongyle eggs per gram of feces (HPG) and hematocrit (HTO), animals were classified as: resistant type I (R1) with HPG <700 and HTO> 30%, resistant type II (R2 ) with HPG <700 and HTO <30%, subject to type I (S1) with HPG> HTO 700 and> 30% and likely type II (S2) with HPG> HTO 700 and <30%. A blood sample was aseptically taken from all animals for haematological evaluations and for serum and faeces sample for the coprologyc study. R1 and R2 groups showed leukocytosis with lymphocytosis, moderate levels of eosinophils and normal values of totals proteins (PT) and its fractions, unlike S1 and S2 groups which had normal leukocyte counts wit hout significant changes among types and hypoproteinemia with decreased globulin fraction. Negative correlation was found between HPG and the levels of leukocytes, lymphocytes, eosinophils, neutrophils, totals proteins and globulins. The racial dominance for resistance to nematodes was: Carora> Cebu> European. The animals >210 days are the most resistant to nematode infection, 26% for R1 and R2 52% (p<0.05). Group R2 are also the most susceptible animals to other infections. Animals most susceptible to nematode infection are those with less than 60 days of age.

Palabras clave : leukocytes; protein; nematode; resistance.

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