SciELO - Scientific Electronic Library Online

 
vol.55 issue2Effects of desflurane, sevoflurane and isoflurane on pulmonary shunt in dogs during spontaneous ventilationEstrus behaviour in Gir cows (Bos taurus indicus) author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Arquivo Brasileiro de Medicina Veterinária e Zootecnia

Print version ISSN 0102-0935On-line version ISSN 1678-4162

Abstract

GUIMARAES, E.B. et al. Parenchymal percentage and apoptotic index of cloacal bursa of broiler chickens maintained in thermal comfort or stress. Arq. Bras. Med. Vet. Zootec. [online]. 2003, vol.55, n.2, pp.178-186. ISSN 0102-0935.  http://dx.doi.org/10.1590/S0102-09352003000200009.

Ninety six broiler chickens were kept in climatic chambers and submitted to three different environmental temperatures 24h/day: 29ºC (hot), 24ºC (neutral) and 15ºC (cold). Eight chickens of each temperature group were sacrificed at 1, 7, 14, 21, 28, 35 and 42 days, and the cloacal bursae (CB) were collected, processed and embedded in paraffin. Sections were stained with HE and histometric evaluation was carried out. From each section, parenchyma ratio (PR) and apoptotic index (AI) were measured. The CB of five week-old chickens kept in lower temperature showed PR lower than CB of chickens kept in neutral temperature. The CB of five week-old chickens kept in lower temperature showed an AI greater than CB of chickens submitted to neutral temperature. The present study shows that environmental temperature stress induces lymphocytes apoptosis, cloacal bursae atrophy and affects CB maturation.

Keywords : broiler; bursa of Fabricius; apoptosis; stress; environmental temperature immunossupression.

        · abstract in Portuguese     · text in Portuguese

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License