数字农科院2.0

Characterization of oviposition pattern in Columbian Rock and White Leghorn breeder layer chickens divergent in laying rate and clutch size

文献类型： 外文期刊

作者： Isa, Adamu M.;Sun, Yanyan;Ni, Aixin;Wang, Yuanmei;Li, Yunlei;Shi, Lei;Chen, Hui;Wang, Panling;Ge, Pingzhuang;Zong, Yunhe;Ma, Hui;Chen, Jilan

作者机构：

关键词： Lag;Delay;Internal cycle length;Laying chickens

期刊名称： JOURNAL OF APPLIED POULTRY RESEARCH

ISSN： 1056-6171

年卷期： 2025 年 35 卷 1 期

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收录情况： SCIE（2025版）

摘要： The objective of this study was to characterize the oviposition patterns in Columbian Rock (CR) and White Leghorn (WL) breeder hens and to identify candidate genes for the oviposition traits. Hens were selected for this study based on their divergence in egg number and clutch size. The selected hens were categorized into Columbian Rock large clutch (CRLC), Columbian Rock small clutch (CRSC), White Leghorn large clutch (WLLC) and White Leghorn small clutch (WLSC). Egg production and clutch traits were recorded until 52 weeks of age for all hens in the two breeds while oviposition time was monitored for 14 days (d) in the hens selected for divergent clutch traits and laying rate. Furthermore, the expression of 16 candidate genes associated with egg laying was analyzed in the ovary tissues of the four groups. Results indicated a higher laying rate in White Leghorn than Columbian Rock. Furthermore, all desirable egg production indices were favorable in the large clutch groups compared to those in the small clutch group irrespective of breed (p <= 0.001). The majority of the hens in CRLC laid eggs between 08:00 and 08:30 hours (h), whereas the majority of hens in CRSC laid eggs between 11:00 and 11:30 h. Similarly, over 83 % of oviposition in WLLC occurred prior to 11:30 h, in contrast to less than 60 % in hens of WLSC. In both breeds, lag in oviposition differed significantly (p <= 0.05) between the large and small clutch groups. The expression of beta-hydroxybutyrate dehydrogenase 1A, pleiomorphic adenoma gene 1, and regulator of G protein signaling 3 in the pre-hierarchical follicles was higher in the CRLC group than in the CRSC. The expression of aromatase was higher in WLSC than in WLLC, suggesting a group-specific expression pattern. Hens with large clutches demonstrated a narrow oviposition window and consistently shorter oviposition lag, leading to shorter internal cycle lengths and an overall higher egg-laying efficiency.

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