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Este estudo visou a determinar os valores eritroleucométricos e quantificar as subpopulações linfocitárias no sangue do cordão umbilical (SCU) e no sangue jugular de eqüinos neonatos. Foi realizada a colheita de SCU e do sangue jugular de 20 potros ao nascimento. As amostras foram submetidas às determinações dos valores eritroleucométricos e à quantificação de subpopulações de linfócitos-T, pela técnica citofluorométrica. Não foram verificadas diferenças significativas (P<0,05) entre os valores médios de tais parâmetros, entre o sangue jugular de neonatos e o SCU eqüino. O valor total para neutrófilos segmentados, no SCU e na jugular dos neonatos, foi inferior ao reportado para eqüinos ao nascimento. As contagens de linfócitos CD5+ e CD4+ no SCU e jugular de neonatos eqüinos foram inferiores àquelas admitidas para o sangue periférico de eqüinos adultos, indicando um componente imunológico imaturo. No entanto, a contagem de linfócitos CD8+ foi semelhante à descrita em sangue periférico de eqüinos adultos. A proporção CD4:CD8 obtida nesse ensaio, tanto para o SCU (2,64±0,91), como no sangue jugular de eqüinos neonatos (2,41±0,81), demonstrou uma dominância das células T CD4+ sobre os linfócitos T CD8+. The objective of the present study was to determine erythometric and leukometic values and quantify subpopulations of lymphocytes in umbilical cord blood (UCB) and jugular blood of neonate foals. UCB and jugular blood were collected from 20 foals at birth and processed for determination of erythometric and leukometric values and quantification of subpopulations of T lymphocytes by cytofluorometry. No significant difference (P<0.05) was noted between average values in neonate jugular blood and equine UCB. Total values observed for segmented neutrophils in UCB and neonate jugular blood were lower than those reported for horses at birth. The quantity of CD5+ and CD4+ lymphocytes was lower in UCB and neonate jugular blood than in peripheral blood of adult horses, which indicates immunological immaturity. The frequency of CD8+ lymphocytes, however, was similar to that described for peripheral blood of adult horses. CD4:CD8 ratio observed in the present study both for UCB (2.64±0.91) and for neonate jugular blood (2.41±0.81) demonstrated the predominance of CD4+ T lymphocytes over CD8+ T cells

Quantificação de subpopulações linfocitárias no sangue do cordão umbilical de eqüinos