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Effect of environmental temperature during the of brooding period on growing period of pullets viscera and tibia

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dc.contributor.authorCândido, M.G.L.
dc.contributor.authorTinôco, I.F.F.
dc.contributor.authorBarbari, M.
dc.contributor.authorFreitas, L.C.S.R.
dc.contributor.authorDos Santos, T.C.
dc.contributor.authorAndrade, R.R.
dc.contributor.authorGates, R.S.
dc.contributor.authorConti, L.
dc.contributor.authorRossi, G.
dc.date.accessioned2019-05-13T10:08:39Z
dc.date.available2019-05-13T10:08:39Z
dc.date.issued2019
dc.descriptionArticleeng
dc.description.abstractPoultry production in subtropical and tropical regions faces many problems, one of which is the high air temperature causing thermal stress, particularly dangerous in high-producing birds. Thus, the negative effects caused by heat stress (HS) must be managed. The objective of this study was to evaluate the effects of four different levels of HS in viscera and tibia of pullets. A total of 648 chicks (Lohmann LSL Lite) were used in this study in two different phases. The pre-experimental phase (PEP) was from day 1 through 6 weeks of age. The birds were reared with three different environmental temperatures: thermal comfort, hot and cold. The experimental phase (EP) was conducted from the 7th to the 17th week. Pullets from each thermal environment of the PEP were submitted to: 20 °C, 25 °C, 30 °C, 35 °C. At the end of the 17th week of age 120 pullets were euthanatized and the organs, heart, liver, spleen and gizzard were weighed, as also their tibias. Effects of PEP, and its interaction with EP, were not significant (P < 0.05) for viscera and tibia weight. However, a significant increase (P < 0.05) in heart weight with the decrease of the environmental temperature was observed, being the pullets subject to 20ºC and 25 °C with the heaviest weights. For the liver, pullets subject to the 35 °C had the lowest weight and were different (P < 0.05) from the other three treatments. For gizzard, the difference (P < 0.05) was between the treatments 20ºC and 35 °C. These results indicate that brooding temperatures tested during the first 6 weeks of life did not affect the viscera and bone weight during the growing phase.eng
dc.identifier.issn1406-894X
dc.identifier.publicationAgronomy Research, 2019, vol. 17, no. 2, pp. 371–377eng
dc.identifier.urihttp://hdl.handle.net/10492/4787
dc.identifier.urihttps://doi.org/10.15159/ar.19.106
dc.rights.holderCopyright 2009 by Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry. No part of this publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, incl. photocopying, electronic recording, or otherwise without the prior written permission from the Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry.eng
dc.subjectheat stresseng
dc.subjectpoultryeng
dc.subjectpulleteng
dc.subjectthermoregulationeng
dc.subjectvisceraeng
dc.subjectarticleseng
dc.titleEffect of environmental temperature during the of brooding period on growing period of pullets viscera and tibiaeng
dc.typeArticleeng

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2019, Vol. 17, No. 2