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首页> 外文期刊>British Poultry Science >Comparative mortality and predation in relation to egg production traits of Rhode Island Red, Black Australorp and Hyblack laying hens in scavenging production systems of rural Malawi.
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Comparative mortality and predation in relation to egg production traits of Rhode Island Red, Black Australorp and Hyblack laying hens in scavenging production systems of rural Malawi.

机译：在马拉维农村地区的扫除生产系统中，与罗德岛红，澳大利亚产黑鹦鹉和海黑产蛋鸡的产蛋特性有关的比较死亡率和捕食。

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摘要

1. Black Australorp (BA), Rhode Island Red (RIR), and Hyblack (HB) birds were used in farm and field scavenging systems in Malawi, to study mortality through disease and predation in relation to laying performance. 2. Predation was higher in BA than HB. 3. Mortality through disease was higher in RIR than BA and HB. 4. Crossbred HB birds show the lowest combination of mortality and predation, suggesting a heterosis effect. 5. Mortality did not differ on farms and in field environments, suggesting an inability to improve biosecurity in farm conditions. 6. There was a positive relationship between eggshell strength and mortality. Calcium depletion from the birds' bones, limiting foraging and escaping ability may be the explanation, which ultimately increases susceptibility to disease and predation.
机译：1.在马拉维的农场和田间清理系统中，使用了黑澳斯特洛普（BA），罗得岛红（RIR）和海布莱（HB）禽类，以研究疾病和掠食与死亡率有关的死亡率。 2. BA的捕食率高于HB。 3. RIR的疾病死亡率高于BA和HB。 4.杂交HB禽的死亡率和捕食率最低，表明具有杂种优势。 5.农场和野外环境的死亡率没有差异，表明无法改善农场条件下的生物安全。 6.蛋壳强度与死亡率之间存在正相关关系。钙从鸟类骨骼中耗竭，限制了觅食和逃逸能力，这可能是造成这种情况的原因，这最终增加了对疾病和捕食的敏感性。

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