1. Measures of the bilateral apex pubis (BAP) in White Leghorn (WLH) hens aged from 16 to 64 weeks (from the time ovaries were completely undeveloped to senility) were ranked into various groups so the relationship between external traits (BAP distance, comb length, comb height, wattle length, wattle height, body weight) and internal traits (largest ovarian follicle diameter (LFD) and oviduct weight and length) could be determined.2. Using correlation and regression analysis with data from 16 weeks of age to the onset of lay, measurements of the apex pubis showed a strong correlation with LFD (r=0.80, P<0.01) and oviduct weight (r=0.80, P<0.01).3. Multiple comparisons among WLH hens from 16 to 43 weeks of age showed that the BAP distance increased in all groups ranked by LFD or by laying period.4. In the late laying period (>60 weeks of age), BAP distance showed a significant decrease (P<0.01) in long-term non-laying hens compared to laying hens.5. These findings suggest BAP distance can serve as an index for evaluating the onset and probable stages of follicular development during sexual maturation and/or aid in the identification and selection of non-laying hens during reproduction.

中文翻译：

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双侧耻骨顶距离：家禽（Gallus gallus domesticus）卵泡发育和产卵状态的新指标。

1.将年龄在16至64周（从卵巢完全不发育到衰老）的白来克霍恩（WLH）母鸡的双侧耻骨（BAP）的测量分为不同的组，因此外部特征之间的关系（BAP距离可以确定梳长，梳高，体长，体高，体重和内在特征（最大卵泡直径（LFD）以及输卵管重量和长度）。2。使用相关性和回归分析，对16周龄至产后开始的数据进行测量，显示耻骨尖与LFD（r = 0.80，P <0.01）和输卵管重量（r = 0.80，P <0.01）密切相关。 .3。对16至43周龄的WLH母鸡进行的多次比较表明，按LFD或产蛋期排名的所有组中，BAP距离均增加。4。在铺设后期（> 60周龄），与不产蛋母鸡相比，长期不产蛋母鸡的BAP距离显着降低（P <0.01）。5。这些发现表明，BAP距离可以作为评估性成熟过程中卵泡发育的开始和可能阶段的指标，和/或有助于在繁殖过程中识别和选择非产蛋母鸡。