Myeloperoxidase expression in diencephalon is potentially associated with fear‐related behavior in chicks of laying hen

Myeloperoxidase expression in diencephalon is potentially associated with fear‐related behavior in chicks of laying hen

Preventing feather pecking (FP) in adult laying hens is important for the welfare of intensively poultry farming. Fear‐related behavior in growing female layer chicks may predict FP in adult hens. In this study, in two representative laying breeds (White Leghorn [WL] and Rhode Island Red [RIR]) that...

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Bibliographic Details
Published in:Animal science journal Vol. 93; no. 1; pp. e13779 - n/a
Main Authors: Kohno, Suzuka, Ogawa, Shinichiro, Shimmura, Tsuyoshi, Sato, Kan, Tokutake, Yukako
Format: Journal Article
Language:English
Published: Australia Blackwell Publishing Ltd 01-01-2022
Subjects:
Animals
Behavior, Animal
behavioral test
chick brain
Chickens
Chickens - genetics
Chickens - metabolism
Chicks
Diencephalon
Diencephalon - metabolism
Fear
feather pecking
Feathers
Female
Females
Field tests
Gene expression
Genes
Juveniles
myeloperoxidase
Peroxidase
Peroxidase - genetics
Poultry
Poultry farming
Tonic immobility
myeloperoxidase
behavioral test
feather pecking
chick brain
fear
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Summary:Preventing feather pecking (FP) in adult laying hens is important for the welfare of intensively poultry farming. Fear‐related behavior in growing female layer chicks may predict FP in adult hens. In this study, in two representative laying breeds (White Leghorn [WL] and Rhode Island Red [RIR]) that have different FP frequencies, we identified a candidate gene associated with fear‐related behavior in chicks and FP in adult hens. In the tonic immobility test and open‐field test, the behavioral activity was lower in WL chicks than in RIR chicks (P < 0.01), suggesting that WL chicks were more fearful than RIR chicks. Based on previous studies, 51 genes that have been found to be differentially expressed in the brain between high‐ and low‐FP populations were chosen, and their expression levels were screened in the chick diencephalon. This analysis revealed that myeloperoxidase (MPO) gene expression level was higher in WL chicks than that in RIR chicks (P < 0.05). Furthermore, STRING analysis predicted the gene network including MPO and MPO‐related genes and revealed the association of these genes with fear‐related behavior. These results suggest that MPO is potentially associated with fear‐related behavior in growing female layer chicks and FP in adult hens.
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ISSN:1344-3941
1740-0929
DOI:10.1111/asj.13779