The overall hen-day egg production was not significantly different between the 2 cage designs. The
only significant difference between treatments was observed in period 10, in which birds in conventional
cages (CON; 88.6%) had higher (P < 0.05) hen-day egg production than birds in the enriched cages (ENR;
87.0%). The rate of lay in both treatments, over the period of 21 to 61 wk, ranged from 84.5 to 95.9% and was
within the commercial production standards for Shaver White hens (Table 1). Shaver White hens on average
achieve production rates of 84.7% at 60 wk and 96.0% at peak (Institut de Selection Animale B. V., 2007).
Peak production occurred in period 4, between wk 34 and 37, and egg production then gradually declined.
Caging type did not affect the overall feed consumption of laying hens. However, birds in conventional cages
consumed significantly more feed than birds in enriched cages in periods 1 and 4 but significantly less in period
8 and 9 (Table 2). There was a significant (P < 0.0001) period effect for feed consumption. Feed consumption
was highest in period 5, remained relatively constant throughout periods 6 to 8, and gradually declined from
period 9 to 10. Significant cage × period interactions can be explained by a higher rise in feed intake in period
4 and more rapid decline in period 8 in conventional cages. A significant effect of cage type on feed
efficiency was observed only in period 9 (CON = 1.97; ENR = 2.01). However, there was a significant (P <
0.0001) period effect on feed efficiency. Feed efficiency significantly improved in period 3 and 4, increased from
period 5 to 7, remained relatively constant from period 8 to 9, and increased again in period 10 (Table 1). Although
the cumulative percentage mortality (for the full 40 wk) was numerically lower in conventional cages (4.0%) than in enriched cages (5.6%), cumulative percentage mortality between cages was not statistically significant. Mortality for both cages remained relatively constant from period 1 to 3 (CON = 0.2 to 0.4%; ENR = 0 to 0.2%) but steadily increased from period 4 to 10 (CON = 0.6 to 4.0%; ENR = 0.8 to 5.6%). Average egg weight did not differ between the 2 cage
types. The weights of eggs of birds in conventional cages were higher in period 2, 4, and 6 but these did not affect the average. As expected, egg weight increased with hen maturity. A significant (P < 0.0001) increase in egg weight throughout the duration of the production cycle was observed. Egg weight increased substantially from period 1 to 3, followed by a gradual but steady increase from period 4 to 10 (Table 1). A cage × period interaction (P < 0.01) was evident as a result of heavier eggs being produced by hens in conventional cages than in enriched cages, with progressive maturity (periods 2, 4, and 6). Consistent throughout the production period, the specific gravity of the eggs was
similar between cage types (Table 2). Specific gravity of eggs from both cages gradually declined (P < 0.0001)
from period 1 (1.0887) to period 10 (1.0829). Cage type did not affect the overall percentage of cracked eggs
(Table 2). Apart from a higher percentage of cracked eggs of birds in conventional cages in period 7 and 8
การผลิตไข่ไก่วันโดยรวมไม่แตกต่างกันอย่างมีนัยสำคัญระหว่างการออกแบบกรง 2 ที่สำคัญต่างระหว่างรักษาถูกสังเกตในระยะ 10 ในนกซึ่งในแบบเดิมกรง (คอน 88.6%) ได้สูงขึ้น (P < 0.05) การผลิตไข่ไก่วันกว่านกในกรงค่อน (ENR87.0%) อัตราวางในทั้งรักษา ระยะ 21-61 wk อยู่ในช่วงจาก 84.5 95.9% และมีภายในมาตรฐานการผลิตเชิงพาณิชย์สำหรับโกนหนวดขาวไก่ (ตารางที่ 1) โกนหนวดขาวไก่โดยเฉลี่ยให้ราคาผลิต 84.7% ที่ 60 wk และ 96.0% สูงสุด (สถาบันเดอตัวเลือก V. Animale B., 2007)ผลิตสูงสุดเกิดขึ้นในรอบระยะเวลา 4, wk 34 และ 37 และผลิตไข่ แล้วค่อย ๆ ลดลงCaging ชนิดไม่มีผลกระทบต่อปริมาณการใช้ตัวดึงข้อมูลโดยรวมของวางไก่ อย่างไรก็ตาม นกในกรงธรรมดาใช้อาหารมากกว่านกในกรงค่อนในระยะ 1 และ 4 แต่อย่างน้อยในรอบระยะเวลา8 และ 9 (ตารางที่ 2) มีตัวอย่างมีนัยสำคัญ (P < มาก 0.0001) ผลรอบระยะเวลาสำหรับการใช้ตัวดึงข้อมูล การใช้ตัวดึงข้อมูลสูงที่สุดในรอบระยะเวลา 5 ยังคงค่อนข้างคงที่ตลอดระยะเวลา 6-8 และค่อย ๆ ลดลงจากรอบระยะเวลา 9-10 โต้ตอบรอบระยะเวลาที่ลอกกรงที่สำคัญสามารถอธิบาย โดยตัวสูงขึ้นในรอบระยะเวลาลดลง 4 และอย่างรวดเร็วมากขึ้นในรอบระยะเวลา 8 ในกรงธรรมดา สำคัญผลของกรงชนิดอาหารประสิทธิภาพในการถูกตรวจสอบในระยะเวลา 9 (คอน = 1.97 ENR = 2.01) อย่างไรก็ตาม มีตัวอย่างมีนัยสำคัญ (P <0.0001) period effect on feed efficiency. Feed efficiency significantly improved in period 3 and 4, increased fromperiod 5 to 7, remained relatively constant from period 8 to 9, and increased again in period 10 (Table 1). Althoughthe cumulative percentage mortality (for the full 40 wk) was numerically lower in conventional cages (4.0%) than in enriched cages (5.6%), cumulative percentage mortality between cages was not statistically significant. Mortality for both cages remained relatively constant from period 1 to 3 (CON = 0.2 to 0.4%; ENR = 0 to 0.2%) but steadily increased from period 4 to 10 (CON = 0.6 to 4.0%; ENR = 0.8 to 5.6%). Average egg weight did not differ between the 2 cagetypes. The weights of eggs of birds in conventional cages were higher in period 2, 4, and 6 but these did not affect the average. As expected, egg weight increased with hen maturity. A significant (P < 0.0001) increase in egg weight throughout the duration of the production cycle was observed. Egg weight increased substantially from period 1 to 3, followed by a gradual but steady increase from period 4 to 10 (Table 1). A cage × period interaction (P < 0.01) was evident as a result of heavier eggs being produced by hens in conventional cages than in enriched cages, with progressive maturity (periods 2, 4, and 6). Consistent throughout the production period, the specific gravity of the eggs wassimilar between cage types (Table 2). Specific gravity of eggs from both cages gradually declined (P < 0.0001)
from period 1 (1.0887) to period 10 (1.0829). Cage type did not affect the overall percentage of cracked eggs
(Table 2). Apart from a higher percentage of cracked eggs of birds in conventional cages in period 7 and 8
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