Locally adapted goats efficiently gain and lose heat in an equatorial semi-arid environment
The aim of this study was to gain insights in respect to how locally adapted goats exhibit dynamic body heat in an equatorial semi-arid environment. Ten Canindé goats were used in the study (22.90 ± 2.70 kg). Respiratory rate ( R R ; min breaths −1 ), rectal temperature ( R T ; °C) and sweating rate...
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Veröffentlicht in: | International journal of biometeorology 2020-10, Vol.64 (10), p.1777-1782 |
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Zusammenfassung: | The aim of this study was to gain insights in respect to how locally adapted goats exhibit dynamic body heat in an equatorial semi-arid environment. Ten
Canindé
goats were used in the study (22.90 ± 2.70 kg). Respiratory rate (
R
R
; min breaths
−1
), rectal temperature (
R
T
; °C) and sweating rate (
S
R
; g m
−2
h
−1
) were measured for 8 days, once a week, for 8 consecutive weeks in each animal, with collection intervals of 1 h throughout the day (24 h), together with the meteorological variables. Air temperature (
A
T
, °C) and relative humidity (
R
H
, %) were measured, and then, the temperature humidity index (
T
HI
) was calculated. First, we determined 2 days with stressful climatic conditions and similar environmental characteristics (day 1 and 2) among the 8 experimental days. The
R
T
was evaluated on these 2 days using the means of each hour as the cut-off point, and determining whether the animals are efficient (EF) or inefficient (INEF) in heat loss (β
1
) and gain (β
2
). The
R
T
was separated in β
1
and β
2
for 24 h, setting times to obtain the angular coefficients (β) for both. The days with stressful climatic conditions and similar environmental characteristics were day 1 and 2. The hours in which the
Canindé
goats gained and lost heat were respectively 11 a.m. to 3 p.m. and from 4 p.m. to 10 a.m. The animals classified as EF lost more or equal the amount of heat represented for
R
T
. When the mean of all animals was evaluated for efficiency in heat control, the flock was classified as EF. Differences (
P
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ISSN: | 0020-7128 1432-1254 |
DOI: | 10.1007/s00484-020-01959-0 |