抗菌肽Cecropin AD抗肉鸡柔嫩艾美耳球虫效果的研究

180只16日龄粤黄公鸡,随机分为6组（无球虫组NO、无敌球素组ND、敌球素组D、低剂量抗菌肽组CAD900、中剂量抗茵肽组CAD4500和高剂量抗菌肽组CAD9000）,每组3个重复,每重复（栏）10只。D组饲喂含敌球素（Deccox）的饲粮,而其它5组饲喂不合敌球素的基础饲粮;CAD900、CAD4500和CAD9000等3组分别经饮水喂给抗茵肽Cecropin AD（每日摄入剂量分别为900、4500和9000u／kg体重）。在各组饲喂对应试验饲粮1天后,分别对ND、D、CAD900、CAD4500和CAD9000等5组鸡接种柔嫩艾美耳球虫（E．tenella）卵囊（5万／鸡）,并在接种球虫后的第5天观察各组血粪情况,第6天剖检观察盲肠病变情况,第7天计粪便卵囊数,第10天称体重。试验结果表明,Cecropin AD可降低接种柔嫩艾美耳球虫肉鸡的死亡率、盲肠病变值和粪便卵囊数,对肉鸡具有一定的保护作用。     

仔猪的管理

仔猪的健康生长是养猪生产成功的关键。有研究证明,在所有死亡仔猪中,65％死于产后的4日龄内,而其中的一半以上是由于挤压、饥饿和体重不足(0．8公斤或更轻)等造成的。给予新生仔猪更细致的管理,可有效提高每头母猪每年所产的断奶仔猪数。     

Predicting the Dairy Cow Somatic Cell Number of Ningxia Area Based on ARIMA Model

Through dairy herd improvement (DHI) data analysis to predict somatic cell count (SCC) of Ningxia area in time, which providing a reference for the prevention and treatment of mastitis in dairy cows, making the DHI data more effective and timely in guiding the dairy industry production. Using the difference method to make the average cow somatic cell data form September 2011 to February 2016 stabled, then used the seasonal ARIMA model to analysis, fitting and forecasting data. The auto.arima function of R software had been used to calculate the optimal time series that finally confirmed the model was ARIMA (1,1,0)(1,1,0)_[12], AIC was -3.67. The Acf test showed that the residual had no significant autocorrelation; Ljung-Box test showed that all P-value>0.5, indicating that the residual was white noise, and this model could be used to make predication for the next 24 months. The forecast function of the R software was used to predict the dairy cows SCC from March 2016 to February 2017, and the forecast map was drawn. The predicted results showed that the SCC of the entire Ningxia area were showing a downward trend. The SCC would be the least in January 2017,and the predictive value was about 253 100 per mL. It would be the largest in March 2016, was about 439 600 per mL. The results also showed that the dairy cows SCC in Ningxia was higher than the critical value of 20 million of subclinical mastitis. It suggested that the prevention and treatment of dairy cow mastitis need to be strengthened in Ningxia area. At the same time, if the data of the dairy cows SCC was added in timely, the data model should be updated to make it more close to the true value, which would be more meaningful to the actual instruction.     

犬白细胞减少症的病因与治疗

1白细胞分类及功能白细胞数在生理或病理情况下均可能发生变化,外周血液中白细胞的组成主要是中性粒细胞和淋巴细胞,尤其是中性粒细胞数量最多,故在大多数情况下,白细胞的增多或减少,主要受中性粒细胞的影响。因此,白细胞的增多或减少通常与中性粒细胞的增多或减少有着密切关系和相同意义。     

春季油菜管理新技术

阳春三月小油菜正处于抽苔、开花期,是油菜分枝发育、花蕾分化、角果和籽粒形成时期,也是油菜水肥临界期和决定角果数、角粒数的关键时期。管理目标集中在养根、杆壮、保叶、枝多、增花、增角、增粒方面。管理重点是看油菜长势追肥防止早花早苔,保持适宜的土壤水分促进角果和籽粒发育。     

不同浓度6-BA对仙客来叶芽分化的影响初报

以不同浓度6-BA对二年生仙客来的叶片及生长点进行喷布。结果表明各浓度的6-BA对仙客来叶芽分化均有促进的作用,且在设定范围内随浓度增加其作用越明显,即在250ppm浓度叶片增加最明显也最多。     

奶牛乳房炎的发病原因及治疗

<正>奶牛乳房炎是乳房受到物理、化学、微生物等致病因子刺激所发生的一种炎性变化。乳房炎的分类方法较多,有以病原、病理、病程、部位以及临床症状分的,有以乳汁细胞数及乳房和乳汁有无肉眼可见变化     

美国渔民捕获罕见的雌雄同体海蟹

据美国华盛顿邮报报道，最近（5月下旬）美国有一艘蟹笼船在大西洋切萨皮克湾，在使用蟹笼的作业中，意外地捕获1尾雌雄同体的海蟹。这是近20多年来在该海湾每年捕获数以百万计的海蟹中独一无二的，实属罕见。     

松浦镜鲤与德国镜鲤选育系（F4）的可量性状、鳞片数比较

对松浦镜鲤（SP）和德国镜鲤选育系（F4）（DJ）的可量性状及体表鳞片数进行比较,SP与DJ的可量性状与体表鳞被存在差异。SP的体长／体高（2．44±0．15）、头长／眼间距（2．24±0．08）明显小于DJ,体长／头长（3．86±0.20）、头长／吻长（2．99±0．23）明显大于DJ,SP体表的鳞片数明显少于DJ。结果表明,从DJ到SP遗传选育过程中,体型和鳞片的变化已达到了选育目的。     

鸡脚叶对陆地棉光合特性的影响

用远缘杂交后代为材料,测定了不同叶型不同时期的叶绿素含量、光合强度.结果表明:在吐絮期前鸡脚叶叶片的叶绿素含量和光合作用强度均高于正常叶.而在吐絮期后正好相反.考查了不同叶型的单株结铃数、铃重、衣分、虫籽率和僵瓣率.试验结果表明:鸡脚叶对陆地棉产量没有不利影响;与正常叶比较,红铃虫为害的虫籽率和僵瓣率分别低32.7%和18.8%.