摘要
为筛选与梨形环棱螺(Bellamya purificata)出肉率密切相关的壳形性状,随机选取大(5 g以上)、中(3~5 g)、小(1~3 g)3种规格的个体各180只,称质量后测量壳高(X_(1))、体螺层高(X_(2))、螺旋部高(X_(3))、壳宽(X_(4))和壳口高(X_(5)),解剖取腹足肌称质量(即净肉质量)计算出肉率(Y),采用相关性分析、通径分析和逐步回归分析筛选影响梨形环棱螺出肉率的主要壳形性状,并建立多元回归方程。结果显示:3种规格环棱螺的出肉率与各壳形性状均呈显著相关(P<0.01),其中,壳宽与出肉率的相关性最大,大、中、小规格的相关系数分别达0.812、0.811和0.850;通径分析发现,壳宽、壳高、体螺层高和螺旋部高对出肉率的影响均较大,但壳宽对出肉率的直接影响最大,3种规格的通径系数分别为0.534、0.705和0.850;逐步回归分析拟合出大、中、小个体的壳形性状(Xi)与出肉率(Y)的回归方程分别为Y=-0.275+0.013X_(4)+0.010X_(2)-0.003X_(3),Y=-0.112+0.014X_(4)-0.003X_(1)+0.005X_(2)和Y=-0.078+0.019X_(4)。以上研究结果表明,壳宽是与梨形环棱螺出肉率最密切相关的壳形性状,因此,可作为出肉率遗传改良的间接选择性状。
To investigate the shell morphological traits closely related to the meat yield rate of Bella⁃mya purificata,180 individuals of varying sizes,large(≥5 g),medium(3-5 g),and small(1-3 g)were randomly collected for study.After weighing,the parameters:shell height(X_(1)),body whorl height(X_(2)),spiral whorl height(X_(3)),shell width(X_(4))and shell aperture height(X_(5))were measured.The abdominal foot muscle was then dissected to determine the net meat weight,and meat yield rate(Y).Then,correlation analysis,path analysis,and stepwise regression analysis were conducted to identify the key shell morphological traits associated with the meat yield rate.Multiple regression equations were established based on the results obtained.The results showed that,the meat yield rates of three sizes of B.purificata were significantly correlated with all five shell morphological traits(P<0.01).Among these traits,shell width exhibited the highest correlation with meat yield rate,with correlation coefficients of 0.812,0.811,and 0.850 for large,medium,and small individuals,respectively.Path analysis results revealed that shell width,shell height,body whorl height,and spiral whorl height were significantly related to meat yield rate.Notably,shell width displayed the highest correlation with meat yield rate,with path coefficients of 0.534,0.705,and 0.850 for the three size categories.The regression equations for shell morphological traits(Xi)and meat yield(Y)were fitted by stepwise regression analysis as Y=-0.275+0.013X_(4)+0.010X_(2)-0.003X_(3),Y=-0.112+0.014X_(4)-0.003X_(1)+0.005X_(2)and Y=-0.078+0.019X_(4)for large,medium and small size individuals,respectively.The results of this study indicated that shell width is the morphological trait most closely related to meat yield rate,and therefore it can be used as an indirect selection trait for the genetic improvement of meat yield in B.purificata.
作者
田子楷
文衍红
罗福广
肖雄
周小云
TIAN Zikai;WEN Yanhong;LUO Fuguang;XIAO Xiong;ZHOU Xiaoyun(Key Laboratory of Freshwater Animal Breeding,Ministry of Agriculture and Rural Affairs/College of Fisheries,Huazhong Agricultural University,Wuhan 430070,China;Hubei Provincial Fisheries Technology Extension Center,Wuhan 430070,China;Liuzhou Aquaculture Technology Extending Station,Liuzhou 545006,China;Qianjiang Luoguxuantian Aquaculture Cooperative,Qianjiang 433100,China)
出处
《华中农业大学学报》
北大核心
2025年第5期118-125,共8页
Journal of Huazhong Agricultural University
基金
国家重点研发计划项目(2022YFD2400700)
广西重点研发计划项目(桂科农AB2506910042)。
关键词
梨形环棱螺
出肉率
壳形性状
性状选育
Bellamya purificata
meat yield rate
shell morphological traits
traits breeding
