Influence of earlier Breeding on Fertility Rate and Milkability of Breeding Herd
提早配种对育成奶牛受胎率及产乳性能的影响
Unfortunately, the same cannot be said about measures to raise the fertility rate.
要生育率回升, 方法似乎不多。
Particularly related to women's economic activity is the drop in the fertility rate.
与妇女经济活动特别相关的是生育率下降。
Their work includes the identification of genes which govern the growth rate and fertility.
他们的工作包括找出那些控制生长率和繁殖能力的基因。
Instead, in country afterdeveloped country, the fertility rate fell below replacement level.
相反，一个个发达国家的生育率降到了更替水平以下。
France is one of three EU countries with a fertility rate above the magic replacement level.
法国是三个出生率超过神奇的更替水平的欧洲国家之一。
Effects of dietary energy levels on egg production and fertility rate of blue peafowl breeder
日粮能量水平对种用蓝孔雀产蛋和受精率的影响
These mortality figures are against a crude birth rate of37.9 and a total fertility rate of6.2.
这些死亡率数字与37。9得粗出生率和6。2得总和生育率相反。
As a consequence of declines in both fertility and mortality, this rate is expected to decrease.
随着生育率和死亡率的下降，这一比率有望下降。
Identification of the Total Fertility Rate for the Distributed Parameter Control System of Population
一类人口分布参数系统的总和生育率的同定问题
Effects of different phosphorous fertilization rate on crop yield and soil phosphorous potential fertility at lower reaches of Liaohe River Plain
下辽河平原不同磷肥用量对作物产量及潜在养分的影响
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