laying duck
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The natural outbreaks of the enzootic disease in the duck have been recorded in Zhejiang province, and one virus, which caused duck egg laying drop was isolated from duck. The virus was identified as avian paramyxovirus-1 and designated as strain YH99V.
在浙江地区进行鸭病病因的调查过程中，从患病鸭群中分离到一株引起鸭产蛋锐减而不死亡的病毒，经鉴定该病毒属于禽副粘病毒Ⅰ型，命名为YH99V株。
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This study was conducted in Shao-ya diaklings,a laying type duck,to determine its abilities of meat production and feed protein utilization before 12 weeks of age.In the grouped feeding trial and nitrogenbalance test,five isoenergetic diets(2950 kcal calculated ME/kg as fed)were used.The crude proteinquality was essentially the same,and their contents were 27.5,23.0,18.4,15.2,and 12.0,respectively.The results were as follows.The growth rate of draklings increased almost linearly during the first 3 we...
用分组饲养试验和代谢试验方法研究用等能量饲粮，不同粗蛋白水平对公绍鸭12周龄前生长和CP利用能力的影响，结果表明：在前3周内日增重随周龄提高近直线上升，5至6周出现高峰；增重与饲粮CP％、CP采食量间，前3周均呈显著正相关(P≤0.05)，以后则在Ⅰ到Ⅳ组范围内呈显著负相关(P.05)，而CP％最低的Ⅴ组不受周龄影响；测得氮存留率为27.4—55.5叻，平均41.5％；公绍鸭生长对CP水平的要求，前3或4周约20—22％，第4—8周15％或略高，其后降至13—14％；公绍鸭养作肉用，在6周龄前后上市可望获利，但此时体重尚轻，到8周龄后，因饲料耗用比过高，只宜进行牧饲或散养。
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The natural red yolk of duck's eggs is produced by the laying duck in the lake areas in southward of China.
采用薄层色谱、高效液相色谱质谱质谱及高分辨电子轰击质谱方法，分离鉴定了天然红心鸭蛋蛋黄中红色素的分子组成和结构。
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During the survey, some laying duck herds were also observed clinically the decreased egg production and rough egg shell.
在临床上曾经有产蛋下降与畸形蛋之蛋鸭群，其EDS抗体盛行率会较高。
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Caged laying duck ; Metabolizable energy ; Crude protein ; Laying performance ; Feedegg ratio ; Egg quality
笼养蛋鸭；代谢能；粗蛋白质；产蛋率；料蛋比；蛋品质
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Laying duck：蛋鸭
Layer 蛋鸡 | Laying duck 蛋鸭 | Laying rate 产蛋率
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cage-rearing laying duck：笼养蛋鸭
网箱养殖:Formula feeds Cage culture | 笼养蛋鸭:cage-rearing laying duck | 笼型倍半硅氧烷:cage--like silsesquioxane