怀孕母兔胎儿萎缩死亡率与母兔营养水平有关，交配后第9天观察受精卵着床数，超过正常营养水平的高营养水平的胚胎死亡率为44%，正常营养水平的只有18%。前者活胎儿数平均为3.8只，后者为6只。

　　The mortality of fetal atrophy in pregnant rabbits was related to the nutritional level of the mother rabbit. The number of fertilized eggs was observed at ninth days after mating. The mortality rate of the high nutrition level exceeding the normal nutrition level was 44%, and the normal nutrition level was only 18%. The average number of live fetuses in the former is 3.8, while the latter is 6.

　　因此，怀孕期间不宜过度追求高营养水平，这样可减少胚胎死亡率，提高母兔产仔数。

　　Therefore, pregnancy should not be excessive pursuit of high nutritional level, which can reduce embryo mortality and increase litter size of female rabbits.

　　兔群中老龄兔所占比例大是某些兔场年繁殖力低的重要原因。对老龄兔及时淘汰，保持兔群青壮年母兔占绝对优势可提高兔群繁殖力。为此，每年须选留培养充足的后备兔作为补充。

　　The large proportion of aged rabbits in rabbits is an important reason for the low fecundity of some rabbit farms. In order to improve the fecundity of rabbits, it is necessary to eliminate old rabbits in time and maintain the absolute dominance of young rabbits in rabbits. For this reason, sufficient reserve rabbits should be selected every year for replenishment.

　　母兔发情时配种受胎率高，因此要经常对兔群进行发情检查，及时发现，及时配种。配种可采用双重、重复、血配等自然交配法，有条件者亦可采用人工授精技术。对长期不发情的个体，除加强饲养管理外，还要采用物理或化学方法进行催情。

　　When the female rabbit is in estrus, the rate of mating is high, so we should check the rabbits regularly and find out the timely mating. The natural mating methods such as double, repeated and blood matching can be used for mating. In addition to strengthening feeding management, individuals who are not estrous for long periods should also use physical or chemical methods to induce estrus.

　　冬、春季节延长光照时间，每天补充光照至16小时，有利于母兔发情。夏季高温季节要采取多种降温措施，减轻高温对种兔的不良影响，避免和缩短夏季不孕期，可有效增加母兔的年繁殖胎数，从而提高群体繁殖力。

　　In winter and spring, prolonging illumination time and lighting up to 16 hours per day are beneficial to estrus in female rabbits. In summer, a variety of cooling measures should be taken to reduce the adverse effects of high temperature on rabbits and to avoid and shorten the summer infertility period, which can effectively increase the number of reproductive births of the mother rabbit and increase the colony's fecundity.

　　降低舍温的方法有：兔舍前种植藤类植物;加大兔舍通风量。据报道，每100千克种兔日粮中添加10克维生素C粉，可增强繁殖用公、母兔的抗热能力，提高受胎率和增加产仔数。

　　The way to reduce the temperature is: planting vine plants in front of the rabbit house and increasing ventilation in rabbit house. It is reported that adding 10 grams of vitamin C powder to every 100 kilograms of rabbit diets can enhance the heat resistance of the male and female rabbits, increase the conception rate and increase the litter size.

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