毕业论文移动版

摘 要：对克氏原螯虾经济性状的遗传力进行估计，测量克氏原螯虾大螯长、体重、腹节深、腹长、腹节宽、尾肉重，基于加显性分析模型，分别用双列杂交法进行分析讨论。研究了150日龄的克氏原螯虾经济性状的狭义遗传力，体重遗传力估计值在0.0029～0.0289，腹节深遗传力估计值在0.0683～0.1435，腹节宽遗传力估计值在0.2829～0.3676，大螯长遗传力估计值在0.0925～0.4131，腹长遗传力估计值在0.0214～0.2472，尾肉重遗传力估计值在0.2360～0.4163。经济性状遗传力是克氏原螯虾育种的基本参数之一，克氏原螯虾食用部分尾肉重的遗传力估计值最高，对尾肉重这个性状的选择可以获得较大的遗传进展。 71519

毕业论文关键词：克氏原螯虾，经济性状，遗传力，双列杂交，遗传分析模型

Abstract：The heritability of economic traits of chela length, body weight, first abdominal segment height, abdominal length, first abdominal segment width, tail meat weight in Procambarus clarkii were estimated using complete diallel design and based on the additive-dominance genetic analysis model. Results showed that the narrow-sense heritability of 150-day weight heritability estimates ranged from 0.0029-0.0289; the estimated heritabilities of first abdominal segment height were 0.0683-0.1435; the estimated heritabilities of the first abdominal segment width were 0.2829-0.3676; the estimated heritabilities of the large chela were 0.4131-0.0925; the estimated heritabilities of abdominal length were 0.0214-0.2472; the estimated heritabilities of tail meat weight were 0.2360-0.4163. Heritability of economic trait is one of the basic parameters in P. clarkii breeding, the heritability of tail meat weight was the highest, larger genetic progress of this trait may be obtained through selection for this trait.

Keywords：Procambarus clarkii, economic character, heritability, diallel cross, genetic analysis model

目录

1前言 3

2材料与方法 4

2.1材料 4

2.1.1苗种繁育池 4

2.1.2克氏原螯虾 4

2．2实验方法 4

2.2.1双列杂交 4

2.2.2家系的建立 5

2.2.3苗种的培育及养成 5

2.2.4克氏原螯虾经济性状的测量 5

2.2.5遗传力的估计 6

3结果分析 6

4分析与讨论 12

4.1克氏原螯虾经济性状的遗传力 12

4.2遗传分析模型的影响 13

4.3环境对遗传力的影响 14

4.4克氏原螯虾性别之间的差异 14

4.5遗传交配设计方法 14

小  结 16

参 考 文 献 17

致  谢 20

1前言

克氏原螯虾俗称淡水小龙虾，简称（小）龙虾，是淡水螯虾的一个种，其英文名为Red Swamp Crayfish，学名为Procambarus clarkii（Girard），分类上隶属节肢动物门、甲壳纲、十足目、螯虾亚目、螯虾科［1］。因其具有低廉的价格和较高的营养价值而备受广大消费者喜爱，是一种很有市场前景和客观经济效益的水产养殖对象［２］。论文网 (责任编辑：qin)