Effect of thermal environment on body temperature of early-stage laying hens
Laen...
Kuupäev
2018
Kättesaadav alates
Autorid
Andrade, R.R.
Tinôco, I.F.F.
Souza, C.F.
Oliveira, K.P.
Barbari, M.
Cruz, V.M.F.
Baptista, F.J.F.
Vilela, M.O.
Conti, L.
Rossi, G.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
The thermal comfort condition of early
-
stage laying hens can be verified by means of
physiological variations. The mean surface temperature and cloacal temperature are important
parameters to d
emonstrate the effect of the thermal environment on the birds. The objective of
the present study was to correlate homeostasis and stress with physiological responses (mean
surface temperature and cloacal temperature) of lightweight laying hens of the Lohm
ann LSL
Lite line aged from one to forty
-
two days when submitted to different thermal environments.
A total of 864 birds with the same age, origin and uniform body weight were randomly distributed
in four climatic chambers. The characterization of the dif
ferent environments was as follows:
thermal comfort temperature (33.0
–
19.0
°C
), two cold stress levels (28.0
–
17.0
°C
and 25.0
–
17.0
°C
) and one level of heat stress (38.0
°C
–
22.0
°C
). The experiment was performed in a
completely randomized design in the s
ubdivided plots scheme, with four treatments in the plots
and the evaluations (days) in the subplots. The means were compared using the Tukey test,
adopting the 5% probability level. The birds maintained the physiological responses,
based on
cloacal and su
rface temperatures,
within the normal range for all evaluated treatments during the
period between 01 and 42 days of life. The surface temperature of the birds varied as a function
of the air temperature of each breeding environment, with lower surface temperatures for mild
cold and moderate cold treatments.
Kirjeldus
Article
Märksõnad
environmental conditions, poultry, surface temperature, layer chicks, articles