Effects of recovery from short-term heat stress exposure on feed intake, plasma amino acid profiles, and metabolites in growing pigs
Heat stress (HS) damages health and decreases performance variables in pigs, and if severe enough, causes mortality. However, metabolic changes under HS and recovery following HS are poorly understood. Therefore, this study was aimed to exp...
Main Authors: | , , , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Korean Society of Animal Sciences and Technology
2021-05-01
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Series: | Journal of Animal Science and Technology |
Subjects: | |
Online Access: | http://www.ejast.org/archive/view_article?pid=jast-63-3-531 |
Summary: | Heat stress (HS) damages health and decreases performance variables in pigs, and
if severe enough, causes mortality. However, metabolic changes under HS and
recovery following HS are poorly understood. Therefore, this study was aimed to
expose the essential mechanisms by which growing pigs respond to HS and the
temporal pattern of plasma concentrations (PC) of amino acids (AAs) and
metabolites. Crossbred male growing pigs were penned separately and allowed to
adapt to thermal-neutral (TN) conditions (20°C and 80% relative humidity;
TN[-1D]). On the first day, all pigs were exposed to HS for 24 h (36°C
and 60% relative humidity), then to TN conditions for 5 days (TN[2D] to TN[5D]).
All pigs had ad libitum access to water and 3 kg feed twice
daily. Rectal temperature (RT) and feed intake (FI) were determined daily. HS
pigs had higher RT (40.72°C) and lower (50%) FI than TN(-1D) pigs
(p < 0.01). The PC of indispensable (threonine,
valine, and methionine) and dispensable (cysteine and tyrosine) AAs were higher
(p < 0.05) in HS than TN(-1D) pigs and remained
increased during recovery time. Nonprotein α-aminobutyric acid and
β-alanine concentrations were higher (p < 0.05)
in HS than TN(-1D) pigs. The metabolite concentration of creatinine was higher
(p < 0.01) under HS treatment than other treatments,
but that of alanine and leucine remained increased (p <
0.05) through 5 d of recovery. In summary, some major differences were found in
plasma AA profiles and metabolites between HS- and TN-condition pigs. This
indicates that the HS pigs were forced to alter their metabolism, and these
results provide information about mechanisms of acute HS responses relative to
the recovery time. |
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ISSN: | 2672-0191 2055-0391 |