Affiliation:
1. Universidade de São Paulo, Brazil
2. USP
Abstract
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.
Reference24 articles.
1. Haematologic values in newborn beef calves;Adams R.R.;Am. J. Vet. Res.,1992
2. Ein Beitrag zum Blutbild des Kalbes;Anders A.,1966
3. Hematologia de bezerros recém-nascidos: Influência da asfixia neonatal, do tipo do parto e da ingestão de colostro sobre a crase sanguínea;Benesi F.J.,1992
4. Síndrome asfixia neonatal dos bezerros: importância e avaliação crítica;Benesi F.J.;Arqs Esc. Med. Vet. UFBA,1993
5. Hemograma de bovinos sadios da raça Nelore no primeiro mês de vida, criados no estado de São Paulo: influência de fatores etários e sexuais;Biondo A.W.,1996
Cited by
19 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献