CMU/1和CMU/2长爪沙鼠繁殖性能与生长发育观测

Preliminary Study on Growth and Reproductive Performance of Inbred Mongolian Gerbil Strains CMU/1 and CMU/2

目的探讨CMU/1和CMU/2长爪沙鼠生长繁殖性能,为其近交系应用、保种和生产繁殖提供基础数据。方法选择F20~F22代种鼠,按照近交系动物配对方式进行繁育,观测统计1~5胎的胎间隔、窝产仔数、离乳数,生长发育等数据。结果 CMU/1和CMU/2初生体质量为2.5~3.4 g,窝产仔数最少1只,最多9只,离乳成活率为65%~75%,胎间隔最短14 d,最长171 d。2~6周龄体质量增长较快。结论 CMU/1及CMU/2长爪沙鼠窝产仔数差异显著,胎间隔大多数在21~70 d。两个品系长爪沙鼠繁殖性能无明显差异。

Objective To investigate the growth and reproductive performance of CMU/1 and CMU/2 ischemia-prone inbred gerbils; And to provide the data support for its＇ application, conservation and breeding. Methods The generations F20~F22 of 2 gerbil lines were selected and bred in accordance with inbreed Mating rule. The litter interval, the number of birth, the number of weaned pups and the growth curve of the 1-5 litters was analyzed. Results The birth weight of CMU/1 and CMU/2 was 2.5 g to 3.4 g. The litter size ranged from at least 1 to the most 9. The survival rate of weaned litter from 65% to 75%. The shortest litter interval was 14 days, whereas the longest 171 days. The weight gain at 2 to 6 week of age was more rapid. Conclusion There is significant difference in litter size between CMU/1 and CMU/2 ischemia-prone inbred gerbil. Most of them display birth intervals in the 21-70 day. Genotype seems have no effect on the reproductive characteristics of ischemia-prone inbred gerbils.