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To establish reference values and to assess the influence of age on the leukograms of healthy Holstein calves, blood samples were obtained from 300 animals. These samples were distributed equally (n=20) among 15 experimental groups according to age: birth to 8 hours, 9 to 16 hours, 17 to 24 hours, 2 days, 3 days, 4 days, 5 days, 6 to 7 days, 8 to 9 days, 10 to 11 days, 12 to 13 days, 14 to 15 days, 16 to 20 days, 21 to 25 days and 26 to 30 days of age. The maximum numbers of leukocytes (9,305.0/mL), segmented neutrophils (6,551.2/mL) and total neutrophils (6,678.3/mL) were noted within the first 8 hours of life, while band neutrophils peaked in number (133.3/mL) between 9 and 16 hours after birth. Meanwhile, the maximum total lymphocyte (4,992.1/µL) and typical lymphocyte (4,686.1/µL) counts occurred between 21 and 25 days, whereas atypical lymphocytes (388.5/µL) reached their maximum number between 26 and 30 days, demonstrating an inversion of the neutrophil:lymphocyte ratio over time. Thus, the influence of age on the leukocyte count of the evaluated calves was verified. The release of endogenous corticosteroids during labor or at birth may contribute to this variation in leukograms with age.

This work aimed to study the possible relationships among the magnitude of abomasal worm burden and the proliferation of globular leucocytes and mucosal mast cells in the abomasal mucosa, and the white blood cell count. Eighteen Suffolk × Greyface lambs were infected with Haemonchus contortus, and 12 were kept free of nematodes. Blood samples were collected on days 0, 30, and 57 post-infection (p.i.) for leucogram determination. At day 62, all animals were euthanized to count the total number of nematodes recovered in the abomasum and to count the number of mucosal mast cells and globular leucocytes. On day 57, higher levels of parasitism corresponded to lower leucocyte counts. The infected groups had lower lymphocyte counts throughout the experimental period. Animals with higher numbers of parasites had lower neutrophil and eosinophil counts on day 57. The lower the worm burden, the greater the number of mucosal mast cells (r=-0.85; p<0.01) and globular leucocytes (r=-0.87, p<0.01) observed. The sheep most resistant to haemochosis had greater peripheral and tissue cellular immune responses.

RESUMO Foram estabelecidos critérios de interpretação do teste de tuberculinização aplicado ao diagnóstico da

Com a finalidade de estabelecer valores de referência e de avaliar a influência do fator etário sobre o eritrograma de bezerras sadias, da raça Holandesa, utilizaram-se amostras de sangue de 300 animais, distribuídos por 15 grupos experimentais, de acordo com a idade, no primeiro mês de vida. As variações dos valores médios obtidos para os componentes do eritrograma foram as seguintes: número de hemácias (x10(6)/mm³) = 6,68-7,60, volume globular (%) = 29,80-33,35, taxa de hemoglobina (g/dl) = 9,00-10,43, volume corpuscular médio (fl) = 38,93 47,68, hemoglobina corpuscular média (pg) = 11,75-14,69, concentração de hemoglobina corpuscular média (%) = 29,53-31,63% e número de reticulócitos (x10³/mm³) = 0,00-11,86. A influência do fator etário provou-se significativa para o volume corpuscular médio, hemoglobina corpuscular média e número de reticulócitos.

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RESUMOPara o estabelecimento de valores bioquímicos de referência utilizados para avaliar a função hepática de bezerras sadias, da raça Holandesa, utilizaram-se amostras de soro sangüíneo de 300 animais, distribuídos por 15 grupos experimentais, de acordo com a idade, no primeiro mês de vida. Os constituintes bioquímicos estudados foram as bilirrubinas (total ,conjugada e livre) e as enzimas gama glutamiltransferase (GGT), aspartato aminotransferase (AST) e creatina quinase (CK). Considerou-se na análise dos resultados a influência do fator etário. As taxas séricas das bilirrubinas demonstraram maiores valores no primeiro dia de vida (BT-1,360mg/dl; BC-0,150mg/dl e BL-1,175mg/dl), apresentando a seguir diminuições significativas até os trinta dias de vida (BT-0,350mg/dl; BC-0,050mg/dl e BL-0,300mg/dl). A atividade sérica da GGT foi máxima entre 16 e 24 horas de idade (945,00UI/L), sendo seguida por diminuições dos valores, de forma significativa a partir do 11º dia de vida (86,00UI/), atingindo valores descritos para animais adultos aos 30 dias de idade (24,00UI/). As enzimas AST e CK apresentaram taxas máximas no primeiro dia de vida (AST-27,50UI/L e CK-73,00UI/L), seguidas por diminuições e pequenas oscilações até o final do período analisado (AST-19,00UI/L e CK-41,50UI/L). A influência do fator etário provou-se significativa para todos os constituintes bioquímicos estudados.Palavras-chaves: função hepática, bezerros, neonatos, bioquímica clínica. ABSTRACTThree hundred healthy female Holstein calves were used for assess the liver function throughout the first month of life. The following serum biochemical variables were analysed: bilirrubin (total, direct and indirect) and the activities of gamma glutamyltransferase (GGT), aspartate aminotransferase (AST) and creatine kinase (CK). The influence of age on the biochemical values was also studied. The bilirrubin values had highest levels on the 1 st d of life (BT-1.360mg/dl; BC-0.150mg/ dl e BL-1.175mg/dl) and then showed a continuing decrease until the 30 th d of life (BT-0.350mg/dl; BC-0.050mg/dl e BL-0.300mg/dl). The serum GGT activities were at they highest point between the 16 th to 24 th h (945.00UI/L). There was a downward trend from the 11 th d (86.00UI/), presenting the lowest activity at the 30 th d (24.00UI/) similar to the activities usually found in healthy adult dairy cattle. The activities of AST and CK were higher at the 1 st d of life (AST-27.

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