光肩星天牛的成虫监测和适期防治分析     

黄伟 《林业科技情报》2020,52(1):55-57

以光肩星天牛的发生规律和危害特征为基础,应用引诱剂对其成虫进行动态监测,根据监测数据并结合其生活习性确定防治适期和防治方法,为光肩星天牛的监测和防治提供参考。  相似文献   

富锗酵母培养物对下笼蛋鸡肉品质、肠道菌群及结构的影响     

《中国畜牧杂志》2019,(9)

本试验旨在研究富锗酵母培养物对下笼蛋鸡肉品质及肠道的影响。选取505日龄健康的海兰褐壳蛋鸡480只,随机分为4组,每组5个重复,每个重复24只鸡。对照组饲喂基础日粮,试验组在基础日粮中分别添加12、16、20 mg/kg的富锗酵母菌培养物。预试期7 d,正试期为42 d。结果表明:与对照组相比,12、16、20 mg/kg组腿肉的蒸煮损失分别降低45.2%、33.6%、39.7%(P<0.01),pH均高于对照组(P<0.01);16mg/kg组腿肌的亮度(L~*)低于对照组(P<0.05);12、16、20 mg/kg组腿肌的剪切力分别比对照组低44.13%、56.07%、50.60%(P<0.01);各试验组胸肌pH均高于对照组(P<0.01),16mg/kg组的pH高于12、20mg/kg组(P<0.05);与对照组相比,16mg/kg组乳酸菌数量升高(P<0.05);空肠中,各试验组的绒毛长度高于对照组(P<0.01);16、20 mg/kg组绒毛长度/隐窝深度高于对照组(P<0.01)。结果显示,日粮中添加富锗酵母培养物可以改善下笼蛋鸡小肠的形态结构和肠道菌群平衡,提高鸡肉品质,建议添加量为16 mg/kg。  相似文献   

冬季不供热简易产蛋鸡舍的设计与应用研究     

刘文生  仇雪梅 《黑龙江八一农垦大学学报》1992,(1):105-111

通过实验表明:在冬季最低气温-28.3℃的黑龙江省密山市饲养产蛋鸡,只要鸡舍保温良好,适当增加鸡的饲养密度,不用供热,也可保持鸡舍内温度在13℃—15℃的最佳鸡产蛋环境温度;在151天的冬季里实验组鸡,按入舍鸡计算平均每只鸡产蛋103.8个,产蛋率为68.74%,仅比对供热取暖鸡舍的对照组鸡群产蛋率低0.5%,故在寒冷的黑龙江省推广产蛋鸡舍冬季不供热是完全可能的,其经济效益也是显著的。  相似文献   

浅谈成人应用文写作教学的基本原则     

叶春根 《安徽农业大学学报》2001,(2):112-112

成人应用文写作教学应结合成人特点，认真贯彻科学性与思想性相结合、理论与实际相结合、智力因素与非智力因素相结合、统一要求与因材施教相结合等基本教学原则，切实提高教学效果。  相似文献   

蛋鸡低饲养标准饲粮配方的研究     

汪鸿儒  宋金昌 《甘肃农业大学学报》1989,(3)

为适应本地区当前生产需要,用低饲养标准饲粮配方,对莱杭鸡的生长与产蛋性能进行了比较试验。结果表明,在整个试验期内,补加鱼粉(1—5%)的试Ⅰ组,和含2种饼类(2—14%)的试Ⅱ组,在体重、料重比(试Ⅰ组—5.87,试Ⅱ组—6.07,对照6.66),产蛋量,料蛋比(试Ⅰ组—3.83,试Ⅱ组—3.88,对照—4.28)和盈利(元/只:试Ⅰ组—1.03,试Ⅱ组—1.23,对照—0.75)等方面较好:但因试Ⅰ组中鱼粉价高而盈利较低;加菜籽饼(2%)和豌豆粉(3—6.7%)的第Ⅲ组与选自生产配方中的对照组,在生产性能与效益方面较低,但仍可盈利,属于低标准、低效益配方,适于在饲养条件差和经营水平低的养鸡场、户采用。  相似文献   

姜片虫虫体抗原氨基酸的测定   总被引：1，自引：0，他引：1  

喻诚沼  马细妹  任园 《江西农业大学学报》1989,(1)

本文报道4种方法制备姜片虫虫体抗原,进行氨基酸组成的测定。其氨基酸总量(mg/100ml)结果显示:Ag-F1:608.50;Ag-F2:645.80;Ag-F3:357.14;Ag-F4:501.40;以 Ag-F3总量为最低,但值得重视的是 Ag-F3的丙氨酸(8.34),组氨酸(8.60),甘氨酸(11.00);苏氨酸(12.00),均显著降低。而 Ag-F4的组氨酸(4.80)为17种氨基酸含量最低者。其原因有待探讨。  相似文献   

产蛋前期必需氨基酸需要量的测定及饲粮氨基酸模型的建立   总被引：2，自引：0，他引：2  

《中国兽医学报》1995,(4)

  相似文献   

Stress parameters and immune response of layers under different cage floor and density conditions     

《Livestock Production Science》2005,95(3):255-263

The aim of the experiment was to investigate the effects of cage floor and cage density on stress parameters of laying hens. A total of 162 brown laying hens (Hyline Brown), aged 34 weeks, were used in the experiment. Compact-type battery cages, with three floors, were used. Hens were allocated as one, three or five hens in each of 18 cages to obtain three different cage density groups of 1968, 656 and 393.8 cm² floor area per hen, respectively. The same number of cages with different cage density were allocated to three different battery floors (first floor=top, second=middle, third=bottom) systematically. Values for body weight, mortality rate, egg weight, egg production, egg quality characteristics, egg yolk cholesterol content, the levels of blood plasma corticosterone, serum glucose, total cholesterol and triglycerides, the ratio of heterophils to lymphocytes (H-L ratio), antibody titers, claw length score, foot health score, plumage score and throat skin injuries were taken as indicators of stress. The values for egg weight (P<0.01) at the first floor were greater than the other floor levels. The group with five hens per cage had significantly lower mean estimates (P<0.01) than other groups with respects to body weight (P<0.001), egg production (P<0.001), egg weight (P<0.001) and plumage score (P<0.01), while significantly higher mean estimates for egg albumen index (P<0.01), Haugh unit (P<0.01), serum glucose (P<0.001), and H-L ratio (P<0.001). Serum cholesterol was higher in cages with one hen than that with five hens, whereas plasma corticosterone was lower. Antibody titers in cages with one hen was similar to that with three or five hens; however, those with three hens had higher titers than those with five hens. Values for egg breaking strength, yolk index, egg cholesterol content, and foot health score were not affected by cage density or floor. The results suggest that the allocation of three hens per cage had no measurable effect on health and welfare.  相似文献   

Effect of propolis on the expression of CD54 and activation of NF-κB p65 of lung tissue in acute lung injury rats     

HU Fu-liang  CHEN Min-li  LI Ying-hua  ZHU Wei  YING Hua-zhong 《园艺学报》2004,20(6):1066-1069

AIM: To study the effect of propolis on the expression of CD54 and activation of NF-κB p65 in lung tissue of acute lung injury (ALI) rats. METHODS: 40 male Wistar rats were divided into 5 groups: normal control, model control, dectancyl group, water soluble derivative of propolis (WSP) group and ethanol extracted propolis (EEP) group. ALI animal model was performed by oleic acid and LPS twice attack. The pathologic slice was observed with light microscope and the NF-κB p65 activity and CD54 expression were tested by immunohistochemistry (SABC and SP). RESULTS: Both EEP and WSP antagonized the lung edema, decreased the inflammation and inhibited the expression of CD54 and activation of NF-κB p65. CONCLUSION: The increase in the expression of CD54 and the activation of NF-κB p65 in the lung tissues of ALI were involved in the formation of ALI. Propolis ameliorated the lung damage, which maybe related to the inhibition of CD54 expression and NF-κB p65 activation.  相似文献   

Effect of atrial natriuretic peptide on acute lung injury induced by lipopolysaccharide     

JIA Bin  LI Zhi-chao  DONG Ming-qing  ZHANG Li-li  QI Hao-wen 《园艺学报》2004,20(7):1247-1250

AIM: To investigate effect of atrial natriuretic peptide (ANP) on acute lung injury (ALI) induced by lipopolysaccharide (LPS) in rat. METHODS: Mean arterial blood pressure (MAP) was recorded with model 6280 physiology intelligentialize grapher, nitric oxide (NO) and endothelin (ET) concentrations in plasma were measured after lipopolysaccharide (LPS) or following LPS ,ANP was injected into vein in rats. After experiment,lung water as well as pulmonary histopathological changes was measured and observed, respectively. RESULTS: Administration of LPS elicited a persistence decrease in MAP (8.1 kPa±2.6 kPa,at 4 h,P<0.01 vs control); NO and ET concentration in plasma was evident higher than that in control group, respectively (P<0.01); Wet-dry ratio of lung was higher than that in control group (5.15±0.43,at 4 h) (P<0.05); Alveolus detelectasis was observed and pulmonary mesenchyme was thicker than that in control group. No erythrocyte and leukocytes in alveolus,which show an interstitial pulmonary edema, was observed in LPS+ANP group, ANP maintained MAP at higher levels (13.35 kPa±2.93 kPa, at 4 h, P<0.05 vs LPS) after an transient decline when LPS was injected; NO and ET concentration of plasma had all significantly decrease, respectively (P<0.05 vs LPS, at 4 h); Wet-dry ratio of lung was lower than LPS group (4.57±0.35, P<0.05). Compared with control group the ratio was not evident difference (P>0.05); The histopathological of lung displayed markedly improved. CONCLUSION: ANP attenuates ALI induced by LPS in the rat. The effect of ANP may be via decreasing secretion of ET,NO and regulation arterial blood pressure.  相似文献