Great progress has been made in poultry breeding in the past 20 years.

Study on the activities and biomass production of breeding population of Chinese pond heron ARDEOLA bacchus.

池鹭繁殖种群数量、活动规律和生物生产量的研究。

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A study of the breeding ecology of Chinese pond heron in Changsha

长沙池鹭繁殖生态研究

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What is the best way to prevent mosquitoes from breeding in the pond outside the house?

预防蚊子在屋外池塘繁殖的最有效方法是什么？

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Isolation and Identification of Photosynthetic Bacteria from the Breeding Shrimp Pond

对虾养殖池底泥中光合细菌分离及其生物学特性

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The percent of the Iosed amount of the animals' feces pollution 、 domestic living pollution 、 chemical fertilizer pollution and fish breeding pond pollution was separately 29.49%, 50.86%, 16.68% and 2.98%;

畜禽粪便污染源、生活污染源、化肥污染源、精养鱼塘污染源流失污染物分别占总量的29.49%、50.86%、16.68%和2.98%；

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Suzhou and Yangzhou were polluted corresponsively by animals' feces pollution 、 domestic living pollution 、 chemical fertilizer pollution and fish breeding pond pollution.

苏州、扬州两地畜禽粪便污染、生活污染、化肥污染和精养鱼塘污染均占一定的比例。

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Discuss on Anti-osmosis Measure and Effect of Perch Breeding Pond

高位池养殖防渗透措施及效果讨论

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By means of orientational observation in the field, flowering phenology, flowering dynamic, kinds of pollinators and their behavior and visiting frequency were observed and the breeding system, pollen-ovule ratio ( P/ O) and pollen viability were determined.

通过野外定位观测，对柽柳的开花物侯、开花动态、访花者的种类、行为和访花频率，并对其繁育系统、花粉.胚珠比（P/O）、花粉活力进行了检测。

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The mean generation interval of flock is 7.270 years of the current breeding scheme and the ratio input and output is 1: 5.76. But the present use-age of dam and sire is irrational.

现行的育种方案各选择组公母牛使用年限不合理，育种成效不甚理想，全群平均世代间隔7.270年，投入产出比为1：5.76改进余地很大。

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The feed efficiency in the subsystem of livestock breeding and the ratio of coverting the feed to pork energy were high.

家畜养殖亚系统饲料转化率高，转化为肉能比例较大。

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The homogeneous model results show that the tritium breeding ratio would reach 1.20 for Be and Li_4SiO_4 volume ratios from 2 to 6. A realistic, sandwich-type design of the Be and Li_4SiO_4 loadings was used for a geometric approximation of the optimized volume ratio.

根据均匀混和模型的结果，在Be和Li4SiO4的体积比为2至6之间，氚增殖率最大可达1.20。

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The main concern of the study has been the assessment of the spacial distribution of the tritium breeding ratio, the plutonium breeding ratio, and the power density in multi-dimensional configuration and the comparison between One-, two-, three-dimensional global calculation.

重点分析了多维几何中造氚率、造钚率及功率密度的空间分布，比较了一维、二维和三维积分量的计算结果。

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A tritium breeding ratio of 1.158 was obtained for a 2 ∶ 1 Be and Li_4SiO_4 volume ratio in the front part, which satisfies the tritium self-sufficiency condition for the fusion reactor.

因此，采用Be和Li4SiO4夹层布置，在几何上逼近最优体积比，选择前端Be和Li4SiO4体积比为2时，氚增殖率达到1.158，能够较好地满足聚变运行的氚自持条件。

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Results show that the proposed TBM concept has the advantages of higher tritium breeding ratio ( TBR), simple structure design and engineering feasibility.

设计和分析结果表明，所提出的设计具有高氚增殖率、结构简单和工程上可行的特点。

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Comparative Study on the Breeding Rate in Artificial Inseminated Blue Fox under the Influence of LRH-3 、 HCG 、 PMSG

LRH-3、HCG、PMSG影响人工授精（AI）蓝狐繁殖率的比较研究

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And it is not come up to the whole country average standards from all stock group quality to breeding rate, produce rate, commodity rate and meat products.

从整个畜群质量到繁殖率、出栏率、商品率和产肉量，均不及全国平均水平。

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The rate of cow's oestrum fecundation is one key factor of cattle's breeding rate.

奶牛情期受胎率是影响奶牛繁育率的重要因素之一。

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The Stability of the Intraspecific Competition System for the Natural Enemies Which Possess Functional Breeding Rate or Capturing Rate

具有函数放养率或捕获率天敌有种内竞争系统的稳定性

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The Effect of Low Dietary Calcium Intake During Pregnancy on the Breeding Rate in rats

妊娠期低钙饮食摄入对大鼠出产率的影响

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The study on increasing the breeding rate of chicks with low-dosage stimulation

小剂量辐射刺激提高鸡繁殖率研究

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