壳寡糖在早熟梨生产中的应用研究     

刘弘  汪小伟  程兰  吴琼  张艳 《中国果业信息》2012,41(1)

壳寡糖(chito-oligosaccharide，COS)作为一种植物诱抗剂，在植物生长调节及诱导植物抗逆性、抗病性等方面显示了极大的应用潜力。试验研究发现，在早熟梨生产中喷施壳寡糖50 mg?L-1，可明显增强树势，提高抗病能力，促进生长，减少落果，防止梨树早期落叶，单株产量提高18.5％以上, 梨果可溶性固形物含量增加0.8％以上，对提高产量和改善品质效果显著。  相似文献   

Evolution of Fructosaminaemia and Glucaemia during the Growth of Unweaned and Early Weaned Half-bred Zebu Calves     

Coppo JA 《Veterinary research communications》2001,25(6):449-459

The purposes of the study were to obtain the confidence intervalsfor serum fructosamine concentrations in unweaned and early weaned calves, to verify the changes in this glycated protein during growth, when glucaemia declines, and to assess the changes in both parameters attributable to stress or alarm. Sixty out of 120 suckling half-bred zebu calves (60–75 days old) were weaned at day 0 and then received a commercial balanced diet, while the remainder continued to suck. Blood samples were taken at 0, 7, 14, 21, 28, 60, 90 and 120 days and the serum fructosamine and glucose concentrations were measured by conventional methods. Both biochemical parameters declined with time, but there were no statistical differences between the unweaned and weaned calves. The fall in fructosamine concentration correlated significantly with the decline in glucose concentrations in both groups. The confidence interval for fructosamine concentration decreased with age, from 294–303 mol/L at 2 months old to 215–232 mol/L at 6 months old. At the same time, glucaemia declined from 7.5–8.6 mmol/L to 4.8–5.3 mmol/L. Acute elevations in glucaemia, especially in the younger calves, were attributed to alarms, such as those caused by handling and blood extraction. The absence of resultant increases in fructosamine concentration discounts the existence of prolonged hyperglucaemias (stress) in early weaned calves.  相似文献   

湖南早稻的增产潜力与发展对策     

易维希  任泽明 《杂交水稻》1995,(3):1-4

分析了湖南早稻生产滑坡的原因，并从品种（组合）和栽培技术方面分析了湖南早稻的增产潜力及提出了今后发展的对策。  相似文献   

江西早籼优质稻品种筛选试验     

刘益仁  李祖章  刘光荣  袁福生  魏林根  熊小兴  胡春英 《江西农业学报》2003,15(1):58-61

2000和2001年对江西省选育的13个早籼稻品种进行了筛选试验。结果表明:以"金优F6"、"1290S/优丰稻"、"香两优25"3个品种最好,其次为"安两优25"、"佳优早",这5个品种适宜江西作早籼优质稻进行推广。  相似文献   

Pregnancy Rate in Zebu Cows with Two Different Postpartum Intervals Exposed to a Two-Bull Rotational System     

Molina R  Galina CS  Maquivar M  Estrada S  Chávez A  Díaz GS 《Veterinary research communications》2003,27(8):671-680

In order to evaluate the reproductive effect of a rotational breeding system, the pregnancy rate of 69 Zebu cows was assessed, 32 late postpartum (211±93 days postpartum, LP) and 37 early postpartum (averaging 63±8 days after calving, EP). In the LP group, 60% (19/32) were cycling before exposure to the bulls but only 38% (14/37) in the EP group. The two groups were dissimilar from the start (p<0.05). The cows were exposed in a rotational breeding system, with six Brahman bulls with previous sexual experience paired off in three groups (A–B, C–D and E–F). The cows were exposed to each pair of bulls for a period of 3 weeks, with one week in between each period, when the females were without the presence of a male. In the LP group, the pair of bulls A–B obtained a pregnancy rate of 72% (23/32), whereas for bulls C–D the pregnancy rate was 33% (3/9) and for bulls E–F the pregnancy rate was 67% (4/6). In contrast, for the EP cows, bulls A–B obtained a pregnancy rate of 32% (12/37), bulls C–D a pregnancy rate of 67% (12/18) and for bulls E–F a pregnancy rate of 55% (6/11). The percentage pregnancy obtained using the pair of bulls A–B differed (p<0.05) between LP and EP, whereas for bulls C–D and E–F it was similar. The pregnancy rate was different (p<0.05) in the first 3 weeks of mating for the LP group, the highest number of cows becoming pregnant during the first 3 weeks of the study. In contrast, the highest number of pregnancies in EP occurred evenly during the last 6 weeks. This study suggests that the reproductive performance of pairs of bulls in a 9-week rotational programme with the overall pregnancy rate is similar (94% in the LP and 81% in the EP). However, the time taken for the females to become pregnant, and hence the performance of the bulls, is related to the average number of days postpartum for the cows.  相似文献   

液态饲料对超早期断奶仔猪肠道微生物区系的影响   总被引：5，自引：0，他引：5  

陈理银  李朕杰  杨茜  郭文博 《饲料工业》2006,27(11):32-34

试验选用平均体重为(2.63±0.15)kg、(14±2)日龄的断奶仔猪(云南地方撒坝猪)20头,随机分为对照组和试验组2组,进行32d对比试验。研究了液态饲料对超早期断奶仔猪肠道微生物区系的影响。结果表明,液态饲料能显著促进超早期断奶(SEW)仔猪肠道内乳酸杆菌生长,同时显著降低大肠杆菌含量(P<0.05)。  相似文献   

萝卜新品种热杂60的选育     

朱美容  张元才  乐正碧  黎华  徐茜  陈贵林 《长江蔬菜》2000,(10):41-43

萝卜新品种热杂６０以萝卜雄性不育系１２２５Ａ为母本，６０早９０－８－８－３－１３自交系为父本配制而成，肉质根近圆形，皮肉白色，生食脆嫩，煮食化渣味甜，具有耐热、早熟、抗病毒病、不易糠心等特点，一般６６７ｍ＾２产２５００ｋｇ左右，最高可达６０００ｋｇ以上。  相似文献   

浅谈孔隙率对沥青路面的影响     

王洪梅  郝刚 《林业科技情报》2013,(4):103-105,107

沥青混合料的孔隙率是一个重要的设计参数，其对于沥青路面的强度和使用性能有着重要的影响。在施工时，由于施工条件和设备的影响，不可能达到设计的孔隙率，于是一般要求用压实度作为施工时的一个控制指标，将沥青路面施工后的孔隙率控制在一个可接受的范围。在路面使用的初期，必然会有一段时间处于未完全压实工作状态，这种工作状态下，沥青路面能够提供的是未完全稳定的早期强度。在设计时，需要对比多个级配的混合料，确定合理的早期强度。  相似文献   

籼型杂交早稻优Ⅰ 66的选育与应用     

张慧廉  彭应财  方洪民 《杂交水稻》1999,(2)

优Ⅰ６６是中国水稻研究所用印水型不育系优ⅠＡ与早籼恢复系６６配组选育而成的籼型杂交早稻新组合。该组合具有产量高、抗稻瘟病、米质优、制种易获高产、适应性广等特点，适宜在长江以南各省和桂北、粤北、闽北作双季早稻种植。１９９７年３月通过江西省品种审定委员会审定  相似文献   

优质中熟杂交早稻汕优45的选育与应用     

沈其文  熊常财  陈正明 《杂交水稻》2000,15(1):11-12

汕优４５是湖北省咸宁市农科所用珍汕９７Ａ与早籼恢复系４５－１０配组选育而成的籼型杂交早稻新组合。该组合具有产量高、米质优，熟期短，抗病性强等特点，１９９９年３月通过湖北省品种审定。  相似文献