不同日粮组成对断奶初期奶公犊瘤胃内环境指标的影响     

陈宁  尹君亮  刘福元  李国庆  宋志强  孟季蒙 《家畜生态》2006,(6)

选用3头三月龄左右装有瘤胃瘘管的荷斯坦奶公犊,按3×3完全拉丁方试验设计,喂给三种日粮。日粮组成按精粗比分别表示为:70:30;60:40;50:50,研究不同日粮组成对断奶初期奶公犊瘤胃内环境指标包括pH值、氨氮(NH3-N)浓度、纤毛虫数量及微生物蛋白的影响。试验结果表明:精粗比为70:30日粮条件下奶公犊瘤胃内pH值显著低于其它组(P<0.01),70:30日粮组瘤胃内NH3-N浓度显著高于精粗比为60:40和50:50日粮(P<0.01)。不同日粮组成下精粗比为60:40和50:50日粮的瘤胃纤毛虫数量和微生物蛋白显著高于高精料组70:30日粮(P<0.01)。  相似文献   

Tomato early blight (Alternaria solani): the pathogen, genetics, and breeding for resistance     

Reni Chaerani  Roeland E. Voorrips 《Journal of General Plant Pathology》2006,72(6):335-347

Alternaria solani causes diseases on foliage (early blight), basal stems of seedlings (collar rot), stems of adult plants (stem lesions), and fruits (fruit rot) of tomato. Early blight is the most destructive of these diseases and hence receives considerable attention in breeding. For over 60 years, breeding for early blight resistance has been practiced, but the development of cultivars with high levels of resistance has been hampered by the lack of sources of strong resistance in the cultivated tomato and by the quantitative expression and polygenic inheritance of the resistance. In some accessions of wild species, high levels of early blight resistance have been found, but breeding lines still have unfavorable horticultural traits from the donor parent. Recently, the first linkage maps with loci controlling early blight resistance have been developed based on interspecific crosses. These maps may facilitate marker-assisted selection. This overview presents the current knowledge about the A. solani–tomato complex with respect to its biology, genetics, and breeding.  相似文献   

Biotransformation of clomazone in rice (Oryza sativa) and early watergrass (Echinochloa oryzoides)     

P.L. TenBrook 《Pesticide biochemistry and physiology》2006,85(1):38-45

Rice (Oryza sativa), a relatively tolerant species, and early watergrass (Echinochloa oryzoides; EWG), a relatively susceptible species, were exposed to ¹⁴C-labeled clomazone to determine accumulation, biotransformation, and mass balance. On a total mass basis, rice absorbed more clomazone than EWG (p < 0.05), but on a nmol/g basis, there was no significant difference between the two species (p > 0.05). Rice contained more extractable ¹⁴C residues (7.7 ± 0.5 vs. 4.8 ± 0.5 nmol in rice vs. EWG, respectively; p < 0.5), but the concentration in EWG was significantly higher (4.2 ± 0.5 vs. 1.8 ± 0.1 nmol/g in EWG vs. rice, respectively; p < 0.01). More metabolized residue was measured in EWG compared to rice (84.1% vs. 67.9%; p < 0.01). Both species produced hydroxylated forms, β-d-glucoside conjugates, and several other unidentified polar metabolites, but EWG generally produced higher metabolite concentrations. The concentration of the suspected active metabolite, 5-ketoclomazone, was significantly higher in EWG vs. rice (21 ± 2 vs. 5.7 ± 0.5 pmol/g, respectively; p < 0.01). Differences in sensitivity to clomazone between rice and EWG appear to be due to differential metabolism, but in this case the more susceptible EWG qualitatively and quantitatively metabolized more clomazone than the more tolerant rice. This is consistent with the action of a metabolically activated herbicide. This metabolic difference could be exploited to develop herbicide safeners for use with clomazone.  相似文献   

膨化与加酶玉米对断奶仔猪生长性能和肠黏膜形态的影响   总被引：1，自引：0，他引：1  

王潇  何瑞国  刘俊熙 《中国兽医学报》2006,26(1):94-97

通过2个饲养试验，研究了膨化及加酶处理玉米对断奶仔猪的生长性能和肠黏膜形态的影响。试验一分别用普通玉米、膨化玉米、普通玉米加酶及膨化玉米加酶为主要能量原料的饲料饲喂仔猪做4种处理，每个处理6个重复，定时记录体质量和耗料量．计算日增重、日采食量和料肉比。结果表明，膨化和加酶玉米均可提高日增重，降低料肉比。试验二分别用普通玉米、膨化玉米、普通玉米加酶及膨化玉米加酶为主要能量原料的饲料饲喂仔猪做4种处理，每个处理6个重复，分别在断奶后第14天和第28天各屠宰1头公猪。取十二指肠、空肠前、中、后段以及回肠做组织切片，观察其黏膜厚度、绒毛高度、隐窝深度和绒毛宽度。结果表明，断奶后14d，与普通玉米组相比，膨化玉米组和加酶玉米组都显著提高了十二指肠的绒毛高度，二者共同处理组使十二指肠的绒毛高度极显著提高；2种处理组都显著降低了空肠中段的隐窝深度；显著增加了十二指肠、空肠前段、后段和回肠的黏膜厚度。断奶后28d，2种处理组都显著增加了十二指肠的黏膜厚度。  相似文献   

高寒地区小黑麦在断奶初期奶公犊瘤胃内动态降解的研究     

尹君亮  陈宁  宋志强  刘福元  李国庆  李周权 《中国草食动物》2006,26(4):13-15

选用3头3月龄左右装有瘤胃瘘管的荷斯坦奶公犊,按3×3完全拉丁方试验设计,喂给3种日粮,日粮组成按精粗比分别表示为:Ⅰ组70∶30、Ⅱ组60∶40、Ⅲ组50∶50,研究不同日粮组成下高寒地区小黑麦的DM、CP以及NDF在断奶初期奶公犊瘤胃内动态降解。试验结果表明:精粗比为60∶40日粮时,其CP的消失率和降解参数明显低于精粗比为70∶30和50∶50的日粮,差异显著(P<0.05);其DM和NDF的消失率和降解参数明显高于精粗比为70∶30和50∶50的日粮,差异显著(P<0.05)。  相似文献   

丝瓜新品种早优1号的选育     

王安乐  朱海泉 《中国蔬菜》2006,1(11):31-32

早优1号是以S-14为母本,S-62为父本配制而成的一代杂种。早熟,植株生长势强,第1雌花节位为第5~8节,节成性好,连续结果能力强,果实长棒形,匀直,果皮绿色,表面被蜡粉,果肉脆嫩,味甜,商品性好,果实纵径30cm左右,横径5~6cm,单果质量400~550g,每667m2产量2500kg左右。  相似文献   

早熟杨梅新品种‘早炭梅8801号’   总被引：1，自引：0，他引：1  

王白坡  程晓建  喻卫武  符庆功 《园艺学报》2007,34(1):262-262

 ‘早炭梅8801号’是从‘荸荠种’中选出的杨梅新品种。该品种6月10日果实开始成熟, 比荸荠种提早10～15 d, 果实比荸荠种早熟株系大17.86%, 树冠覆盖面积产量3.5 kg/m² , 可在生态环境较恶劣的低丘红壤区域作为多功能品种栽培。果实鲜食加工兼用, 适应性强, 高产稳产。  相似文献   

早熟甜瓜新品种丰雷的选育     

吕敬刚  李秀秀  彭冬秀  赵宗武 《中国蔬菜》2007,1(4):0-27

丰雷是以太阳品种经连续自交选育出的株系MW-9为母本、法国引进品种经连续自交纯合的自交系Me-10为父本配制而成的早熟厚皮甜瓜一代杂种,果实成熟期35 d(天)左右,果实圆形,单果质量1.3 kg左右。果皮黄绿色,覆10条灰色条带,沟肋明显。果肉白绿色,肉厚3.5 cm,折光糖含量15%左右,香味浓郁。耐贮运,适应性广,每667 m2产量2 500 kg左右,春、秋保护地均可种植  相似文献   

中药饲料添加剂对断奶仔猪血清酶活性的影响     

黄一帆  马玉芳  张中桥  姚金水  俞道进  黄小红 《中兽医医药杂志》2007,26(3):5-7

选取胎次相近（3-5胎）、日龄相同的杜-长-大吮乳仔猪16窝（每窝8-10头）,随机分为4组,分别为中药Ⅰ组、中药Ⅱ组、抗生素组、对照组,前3个处理组在相同的基础日粮中分别添加中药饲料添加剂Ⅰ（4 kg/t）、中药饲料添加剂Ⅱ（4 kg/t）、金霉素（70 g/t）和杆菌肽锌（30 g/t）,每组4窝.各处理组所有仔猪从7日龄开始诱食试验饲粮,直至断奶后28日龄.25日龄断奶时从每窝中选取体重相近的仔猪4-5头,组内合并,每组各18头,于仔猪断奶前3 d,断奶后1、4、7、14、28 d采血,对血清酶指标进行分析,研究中药饲料添加剂对断奶仔猪血清酶活性的影响.结果表明,中药饲料添加剂能通过提高断奶仔猪血清AKP活性,降低CK活性,缓解断奶应激,促进仔猪生长.  相似文献   

茄子新品种‘川茄2号’     

房超  李跃建  刘独臣  刘小俊 《园艺学报》2007,34(5):1332-1332

 ‘川茄2号’茄子为杂种一代，生长势旺盛，果实长棒形，平均单果质量120～130 g。果皮紫黑色，有光泽。果肉月白色，籽少，商品性好。早熟。早期产量高，总产量一般为4 300 kg/hm²。耐寒性较强，适宜露地和保护地早熟栽培。  相似文献