Effect of age at first egg on reproduction performance and characterization of the hypothalamo–pituitary–gonadal axis in chickens
| Autor: | Z.Z. Yin, Yuge Tan, Heqing Cao, Wan-Huan Zhou, Xiuli Xu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
medicine.medical_specialty
Hypothalamo-Hypophyseal System endocrine system Hypothalamo pituitary gonadal media_common.quotation_subject Mrna expression hens Biology age at first egg sexual maturity SF1-1100 Internal medicine medicine Sexual maturity Animals reproductive traits media_common Reproduction GNRHR PHYSIOLOGY AND REPRODUCTION Ovary mRNA expression General Medicine Animal culture Endocrinology Gene Expression Regulation Animal Science and Zoology Female Chickens Hormone Production rate |
| Zdroj: | Poultry Science, Vol 100, Iss 9, Pp 101325-(2021) Poultry Science |
| ISSN: | 0032-5791 |
| Popis: | As an important indicator of sexual maturity of hens, age at first egg (AFE) is significantly associated with reproduction performance. In this study, 400 hens were divided into 6 groups based on AFE to analyze the difference of reproduction performance, reproduction hormone levels and the characterization of the hypothalamo–pituitary–gonadal axis in chickens. The results showed that the egg production of the hens in the late-maturing groups was significantly lower than that of the ones in other groups and the precocious hens had a lower egg production rate. The hens in late-maturing group had a lower fertility rate, LH levels and shorter duration of peak of egg production (PEP), the precocious hens had lower PRL levels. In addition, the characterization of the hypothalamo–pituitary–gonadal axis showed that the individuals with normal AFE had higher GNRH, GNRHR, ESR1, KITLG, and CYP11A1 expression levels than late-maturing and precocious individuals, which indicated that the chickens with normal AFE advantages on reproduction regulation system. |
| Databáze: | OpenAIRE |
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