Variation of Color and Ray Pattern in Juvenile Shells in Hatchery‐produced Freshwater Triangle Pearl Mussels,Hyriopsis cumingii,in China     

Haibo Wen  Ruobo Gu  Zheming Cao  Xin Zhou  Zhijuan Nie  Xianping Ge  Pao Xu  Xin Zhou  Zhijuan Nie  Xianping Ge  Pao Xu  Dan Hua 《Journal of the World Aquaculture Society》2013,44(1):154-160

The variation and inheritance of juvenile shell color and pigmentation pattern in the freshwater mussel, Hyriopsis cumingii, were reported in 1‐yr‐old progeny of eight families. There were three distinctive phenotypes of shell color and pigmentation patterns observed, including a greenish‐brown shell with radial rays, yellowish‐brown shell with radial rays, and yellowish‐brown shell without radial rays. There were no greenish‐brown individuals without radial rays. The shell color phenotypes showed variation with the growth in juvenile Stage I (1–3 cm in shell length), and the percentage of individuals with radial rays increased once they reached a shell length of 11 mm and then stabilized after reaching 20 mm in shell length. Shell color differentiation became more apparent at a shell length of 26 mm. Results of chi‐square tests of the segregation ratio of shell color or ray phenotypes obtained from eight families at juvenile Stage II (6–9 cm in shell length) suggested that greenish‐brown is controlled by a dominant allele (G) and yellowish‐brown‐shell phenotype is by a recessive allele (y); the ray pattern phenotype is controlled by a recessive (r) and a dominant allele (R) at a single locus. Shell color phenotypes may be a useful genetic marker for future selective breeding of triangle pearl mussels.  相似文献   

ASAS-NANP SYMPOSIUM: Applications of machine learning for livestock body weight prediction from digital images     

Zhuoyi Wang  Saeed Shadpour  Esther Chan  Vanessa Rotondo  Katharine M Wood  Dan Tulpan 《Journal of animal science》2021,99(2)

  相似文献   

益生菌发酵红薯渣对肉牛生长性能、养分表观消化率的影响     

周剑辉  陆丹  蒋小霞  朱春刚  李念  蒋莹 《中国饲料》2021,(1):131-134

为研究益生菌发酵红薯渣对肉牛生长性能、养分表观消化率的影响,采用单因素随机设计试验,选择体重相近、健康的育肥肉牛40头随机分成4组,每组10个重复,每个重复1头,试验1组饲喂基础日粮,试验2、3、4组分别用10%、15%、20%益生菌发酵红薯渣替代饲粮中的玉米,预试验10 d,试验期60 d。结果表明:(1)试验3、4组的平均日增重较1组比分别提高16.9、14.1%(P<0.05),试验2、3、4组的平均采食量均高于1组(P>0.05);试验3、4组的料重比较1组比分别降低14.9%、12.4%(P<0.05);(2)试验2、3、4组干物质、蛋白质、钙、磷的表观消化率均高于1组(P 0.05);试验3、4组的中性洗涤纤维、酸性洗涤纤维表观消化率较1组比分别提高12.7%、11.0%、18.9%、16.4%(P<0.05)。综上,益生菌发酵红薯渣替代饲料中15%玉米,可以提高肉牛的生长性能和养分表观消化率。  相似文献   

拷贝数变异在畜禽中的研究进展     

经珍珠  秦盼盼  陈冰洁  侯丹  魏成杰  李通  韩瑞丽  刘小军  田亚东  康相涛  李转见 《中国畜牧兽医》2021,48(7):2512-2522

拷贝数变异（copy number variation,CNV）具有多种形式的变异结构,在品种多样性、生物进化和疾病相关性等研究中起着重要作用,并具有片段长度大、覆盖范围广等特点。随着分子生物学的发展及DNA测序技术的日渐成熟,人们对遗传变异的研究不断向DNA分子水平深入,多态性标记在畜禽育种中已逐渐成为动物育种研究的趋势和主流。由于CNV对基因的调控和表达所造成的影响更为显著,因此,CNV在重要畜禽中的研究越来越多。目前,已检测出大量有关畜禽重要经济性状的基因序列变异,并有许多研究均表明CNV与动物的重要经济特征及疾病的发生有关。笔者主要通过参考国内外相关的研究报道,简述了CNV的相关研究背景、概念、突变机制,归纳总结了CNV对牛、羊、猪、鸡的经济性状、繁殖性状和疾病调控的影响,以期通过对这些重要畜禽的基因组学研究揭示其适应性遗传机理和表型性状差异的遗传基础,开发相应的分子遗传标记,为畜禽的标记辅助选育提供理论基础。  相似文献   

Screening of Probiotics Inhibiting E. coli K88 in vitro     

WANG Lei  LV Yang  ZHANG Yue  XIE Jia-qian  ZHAO Di  YAN Li-qiong  MEI Hui-min  WANG Lei  YI Dan  CHEN Hong-bo  DING Bin-ying  HOU Yong-qing  WU Tao 《中国畜牧兽医》2016,43(5):1355-1360

The probiotics tested in the experiment were isolated from the intestinal of weaning piglets.The isolated probiotics and E.coli K88 were inoculated into the culture of intestinal porcine epithelial cell-1 (IPEC-1).The activity of lactate dehydrogenase (LDH) in the supernatant was measured after incubating for 2.5 h.At the same time, the probiotics and E.coli K88 were co-cultured in vitro, the number of E.coli K88 was counted and the probiotics which could be resistant to the E.coli K88 were selected 2.5 h later.The results showed that the Lactobacillus casei and Bacillus coagulans could significantly reduce LDH activity (P<0.05), decrease the damage of E.coli K88; Bacillus coagulans could inhibit the growth of E.coli K88.At the same time, Bacillus coagulans could resist high temperature, acid and bile salt.The results showed that Bacillus coagulans strains had great potential as the application of probiotics strains.The methods could be used as a model of screen probiotics which could inhibit the growth of E.coli K88 in vitro.  相似文献   

Informing Community Engagement in Sea Turtle Conservation by Examining Non-Conservation-Related Participation in Northeast Brazil     

Marisa A. Rinkus  Dan Kramer  Tracy Dobson 《Human Dimensions of Wildlife》2016,21(1):47-64

Participation in conservation programs is often viewed as a necessity, but understanding of this participation is limited. This research takes a different approach by also examining participation in non-conservation-related activities. Questionnaires (N = 339) were administered in four Brazilian coastal communities where the national sea turtle conservation project conducts monitoring and outreach. Employing social capital as a conceptual framework, measurements included participation in civic, community, and social activities along with group participation and collective action. Confirmatory factor analysis was used for validating measures of social capital and conservation perceptions. Structural equation modeling indicated that social capital has a positive relationship with participation in sea turtle conservation, suggesting that general levels of participation and community norms of participation could be just as influential as conservation perceptions to engage communities in conservation. Information gained by deconstructing participation may be used to design and target conservation programs, improving overall participation.  相似文献   

贮藏温度对采后“金艳”猕猴桃品质和后熟的影响     

杨丹  王琪凯  张晓琴 《北方园艺》2016,(2):126-129

以"金艳"猕猴桃为试材,采用不同温度贮藏的方法,研究了温度对果实品质和呼吸强度的影响。结果表明:1℃贮藏可以很好的保持果实品质,呼吸强度峰值出现晚,保持了较高的果肉硬度;5℃和10℃贮藏能够促进果实的后熟,加速呼吸强度峰值的到来、果实硬度的下降和可溶性固形物含量的上升;但35℃贮藏的果实7d后会失去商品价值,发生腐败;16℃贮藏果实后熟品质不佳。在整个贮藏过程中,果实干物质含量在上述温度条件下贮藏变化都不明显,但在一定范围内,干物质含量会随着温度的上升而有所增加。  相似文献   

缺素胁迫对软枣猕猴桃幼苗生长的影响   总被引：4，自引：0，他引：4  

陈鑫  刘丹  李然红  孙雪芳 《北方园艺》2016,(19):27-30

以软枣猕猴桃幼苗为试材,研究了缺铁(Fe)、镁(Mg)、磷(P)、钙(Ca)、钾(K)、氮(N)6种元素对其幼苗生长及生理指标的影响。结果表明:不同缺素处理对其幼苗的生长发育及生理指标均能产生不同程度的影响,其缺钙(-Ca)、钾(-K)、氮(-N)对软枣猕猴桃幼苗根长、株质量、株高影响显著;游离脯氨酸(Pro)含量、丙二醛(MDA)含量、过氧化物酶(POD)活性及超氧化物歧化酶(SOD)活性均明显增加。  相似文献   

三种地被菊种子萌发及幼苗生长的化感效应比较     

胡妍妍  王丹  曾嵘 《北方园艺》2016,(21):89-91

以天人菊、金鸡菊和蛇鞭菊为试材,比较两两混种与单种在种子萌发和幼苗生长阶段相互间的化感效应强度。结果表明:两两混种下,金鸡菊、蛇鞭菊对天人菊生长起促进作用,化感效应强度为金鸡菊蛇鞭菊;天人菊、蛇鞭菊对金鸡菊生长起抑制作用,化感效应强度为天人菊蛇鞭菊;金鸡菊、天人菊对蛇鞭菊生长起抑制作用,化感效应强度为金鸡菊天人菊。  相似文献   

Immunology. The education of T cells     

Ferber D 《Science (New York, N.Y.)》2007,316(5822):191-193

  相似文献