Heat stress impairs egg production in commercial laying hens infected by fowl typhoid

Rubio, Marcela da Silva; Alves, Lucas Bocchini Rodrigues; Viana, Guilherme de Brito; Benevides, Valdinete Pereira; Lima, Túlio Spina de; Ferreira, Taísa Santiago; Almeida, A. Bugalho de; Barrow, Paul; Berchieri, Ângelo

doi:10.1080/03079457.2020.1845302

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…In our study, heat treatment (32 °C) led to negative effects, including a decrease in egg production (25%), egg weight (4.9 g), and egg mass (18.43 g/day), in hens reared under heat stress. Our current results showing decreased laying rates are consistent with previous findings [ 6 , 29 ], which reported that heat stress reduced egg production in heat-stressed laying hens. Other researchers have also shown that exposure to either cyclic or constant heat stress for 1 week could decrease the EW [ 7 , 8 ].…”

Section: Discussionsupporting

confidence: 93%

Effect of Heat Stress on Egg Production, Steroid Hormone Synthesis, and Related Gene Expression in Chicken Preovulatory Follicular Granulosa Cells

Yan

et al. 2022

Animals

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This study was conducted to elucidate the molecular mechanisms underlying heat stress (HS)-induced abnormal egg-laying in laying hens. Hy-Line brown laying hens were exposed to HS at 32 °C or maintained at 22 °C (control) for 14 days. In addition, granulosa cells (GCs) from preovulatory follicles were subjected to normal (37 °C) or high (41 °C or 43 °C) temperatures in vitro. Proliferation, apoptosis, and steroidogenesis were investigated, and the expression of estrogen and progesterone synthesis-related genes was detected. The results confirmed that laying hens reared under HS had impaired laying performance. HS inhibited proliferation, increased apoptosis, and altered the GC ultrastructure. HS also elevated progesterone secretion by increasing the expression of steroidogenic acute regulatory protein (StAR), cytochrome P450 family 11 subfamily A member 1 (CYP11A1), and 3b-hydroxysteroid dehydrogenase (3β-HSD). In addition, HS inhibited estrogen synthesis in GCs by decreasing the expression of the follicle-stimulating hormone receptor (FSHR) and cytochrome P450 family 19 subfamily A member 1 (CYP19A1). The upregulation of heat shock 70 kDa protein (HSP70) under HS was also observed. Collectively, laying hens exposed to high temperatures experienced damage to follicular GCs and steroidogenesis dysfunction, which reduced their laying performance. This study provides a molecular mechanism for the abnormal laying performance of hens subjected to HS.

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