奶牛冷冻胚胎规模化移植效果研究     

林峰  陈玉霞  史明艳  高腾云  杨美广 《中国农学通报》2006,22(7):9-11

为了提高奶牛良种化程度,对奶牛冷冻胚胎的规模化移植效果进行了研究。结果表明:PG二次肌注法的发情率显著高于(P<0.05)PG一次肌注法,两种方法的发情同期率均超过85%,受体牛发情时间多集中在肌注PG后48～72h;胚胎解冻后的复苏率达到82.58%,且早期囊胚与囊胚的复苏率要高于桑椹胚(P>0.05);共移植受体牛218头,受胎97头,受胎率为44.5%,且春、秋季的移植效果差异不显著(P>0.05)。为奶牛冻胚的规模化移植研究提供了参考依据。  相似文献   

N_(98s)×特青(亚种间杂交稻)抽穗后物质生产及分配特点研究初报     

李之林  吴炎龙  谢利昌  陈英取 《华南农业大学学报》1991,(1)

对N×特青示范田中试区与肥料试验田各处理小区稻株分析结果表明:抽穗后,亚种间杂交稻N×特青比常规稻特青干物质生产能力强,灌浆速度快;地上部各器官占植株干重比例,前者叶片比重大于茎,后者茎比重大于叶。亚种间杂交稻对肥料反应敏感,抽穗后,干物质累积,植株高度,每穗总粒数和粒重均随施肥量增加而增加,在高肥区有利于进一步提高产量,但增施氮肥后,灌浆速度明显滞后。  相似文献   

普通番茄与秘鲁番茄杂种后代的形态,亲和性及抗性表现   总被引：1，自引：0，他引：1  

徐鹤林  吴鹤鸣 《园艺学报》1991,18(3):233-238

继获得普通番茄‘北京早红’与秘鲁番茄杂交种后,本试验着重于对杂种后代的形态、亲和性及抗性表现的观察,杂种的多数性状为双亲中的显性性状或双亲的中间型,但也表现了一些奇异性状,如果实的颜色和花序的形状与排列通过株间的“杂交”克服了杂种的高度自交不亲和性,从而顺利得到杂种的自交后代;杂种各世代均高抗TMV 0株系和1株系,并有部分选系抗TMV 1·2株系,由此判断秘鲁番茄亲本可能具有TM~a_2基因;用南京地区CMV厥叶株系和强株系分别接种,各世代表现部分抗病或耐病。  相似文献   

杂交条纹鲈苗种小水泥池培育技术试验     

田功太段登选  曹振杰马荣棣  陈述江孙栋 陈金萍 《齐鲁渔业》2004,21(7):1-3

用地上露天小水泥池8个．进行杂交条纹鲈苗种培育试验．放养313龄水花30000尾．通过天然饵料、藻粉投喂以及适当水质管理措施．经32天培育，共培育3．5～4．6cm体长的鱼种4336尾．最高成活率为19．1％，最低为6％，平均为14．5％。  相似文献   

Embryo Production, Freezing and Transfer in Angora, Alpine and Saanen Goats   总被引：1，自引：0，他引：1  

B. Baril  P. Casamitjana  J. Perrin  J.C. Vallet 《Reproduction in domestic animals》1989,24(3):101-115

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Effect of Nitrogen Rate and Stubble Height on Dry Matter Yield,Crude Protein Content and Crude Protein Yield of a Sorghum–Sudangrass Hybrid[Sorghum bicolor (L.) Moench × Sorghum sudanense (Piper) Stapf.] in the Three‐Cutting System     

S. Iptas  A. R. Brohi 《Journal of Agronomy and Crop Science》2003,189(4):227-232

In this study, the effects of nitrogen (N) rate (60, 120, 180 and 240 kg N ha^?1 applied in three equal dressings at seeding and after the first and second cuttings) and stubble height (7, 14 and 21 cm) on the dry matter (DM) yield, crude protein (CP) content, and CP yield of a sorghum–sudangrass hybrid [Sorghum bicolor (L.) Moench × Sorghum sudanense (Piper) Stapf., cv. Pioneer 988] in the three‐cut system was investigated. The N rate had no significant effect in the first and third cuttings, but in the second cutting DM yields increased significantly with increase in N rate. The highest yield of 9.1 t ha^?1 was obtained with 80 kg N ha^?1 for the average of 2 years at the second cutting, but no significant difference was found among the 40, 60 and 80 kg N ha^?1 rates. CP content and yield were not significantly affected by N rate at the first and third cuttings, but CP content and yield were significantly affected by application of N at the second cutting. Stubble height had a significant effect on CP content at the third cutting. However, it had no significant effect on CP content at the first and second cuttings. Stubble height had a significant effect on the CP yield at the first cutting, but no significant effect on CP yield at the second and third cuttings.  相似文献   

波尔山羊胚胎移植影响因素的分析   总被引：4，自引：0，他引：4  

代相鹏  王锋 《家畜生态》2004,25(4):230-232

波尔山羊胚胎移植效果受诸多因素的影响，供体状况、药物、季节等因素使供体超排效果产生较大的差异，而受体状况、胚胎质量等对受体的妊娠率产生较大的影响，这些因素阻碍了波尔山羊胚胎移植的产业化应用。本文对以上影响波尔山羊胚胎移植效果的因素进行了分析，以期为提高胚胎移植效率提供依据，从而促进波尔山羊胚胎移植产业化进程。  相似文献   

Estimating Combining Ability of 4x-2x Crosses in Cultivated Potatoes     

Tian Xingya  Lu Wenhe  Ouyang Guangpi  Chen Yili  Wang Fengyi 《东北农业大学学报(英文版)》1996,(2)

Progenies derived from crosses between Solarium tuberosum and 2n pollen-Producing diploid hybrids, exhibit obvious hybrid vigor. The 2n pollen-producing clone can act as a bridge in crossing S. tuberosum and S. andigena with S. phureja. Populations from 4x-2x crosses show more unifomity and less segregation compared with that of 4x-4x crosses. The parent-offspring correlation for the traits, starch content and tuber number, is significant at 0.01 level. The regrssion equations are Y (mp-F1)=1.0 1.2x and Y (mp - F1) = 5.3 0.8x, respectively. The 2n pollen-producing clones play an impotant role in increasing tuber stach content. Estimates of the combining ability for the main yield components indicate that additive effect prodominatcs for such trais as plot yield, tuber weight per plant and starch content, whereas both additive and non-additive effects lay equal stress on mean tuber weight and non-additive effect is important for tuber number. In general, non-additive effect appears to be important in  相似文献   

受精用液种类对牛卵母细胞体外受精的影响   总被引：5，自引：0，他引：5  

《中国兽医学报》1994,(2)

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超级稻“三定”栽培法研究Ⅲ．不同栽培方式对超级杂交稻产量形成的影响     

敖和军  邹应斌  王淑红  唐启源  冯跃华 《中国农学通报》2006,22(7):169-173

超级杂交稻的优化(稀植、结构施肥)栽培试验于2002-2004年在长沙进行,以比较不同栽培方法对超级杂交稻产量及物质生产的影响。以两优培九为材料,并以汕优63作为对照。结果表明,两种栽培法,两个供试品种的产量表现不同,其中两优培九采用优化栽培单产为8.20～10.37t/hm2,比传统栽培增产显著。主要表现为有效穗多,而结实率、千粒重、穗实粒等产量因子差异不明显。汕优63采用优化栽培单产比传统栽培减产0.37%～8.8%。两种栽培方法间的茎蘖发生动态和单株分蘖数存在极显著差异,两组合单株分蘖数优化栽培比传统栽培分别多110.36%和110.64%,但由于移栽密度不同,两种栽培方式间的单位面积分蘖数没有明显差异。两优培九采用优化栽培的在各个生育时期,植株体内的含氮量比传统栽培的高。  相似文献