我国幅员辽阔,地形、气候等自然环境条件复杂,16种畜禽的寄生虫多达2 323种,隶属424属126个科[1],给畜禽健康及生产效率带了严重影响。四川省凉山彝族自治州羊寄生虫病很严重,据报告[2],羊的寄生虫种类多达92种,优势虫种达16个,其中,感染最严重的1只山羊体内寄生虫多达142768条,一只羊最多有38种寄生虫混合寄生.

目的检测复方阿维菌素乳剂对绵羊体内外寄生虫的驱杀效果。方法选35只羊随机分为2个试验组和1个对照组,第1组9服剂量为0.5 mL/10 kg.BW,第2组为1.0 mL/10 kg.BW。用药后10 d,对试验羊进行体表寄生虫以及粪便中寄生虫虫卵的检查,并观察各组试验羊精神、食欲等生理反应。结果1.0 mL/10 kg.BW剂量组比0.5 mL/10 kg.BW剂量组驱虫效果明显。结论复方阿维菌素乳剂对绵羊体内外寄生虫有较高的杀灭作用。

2003年以来,开展了建昌黑山羊生产性能测定。经测定,成年公、母羊体重(kg)分别为38.40±6.44和35.49±4.73,成年公、母羊体高(cm)分别为64.00±2.27和61.57±4.04,成年公(羯)、母羊屠宰率分别为52.94%和48.36%,母羊产羔率为155.80%,经产母羊月均泌乳12.10kg。

An investigation of the same mowing heights (4?cm and 8?cm) on turf grass community structure which was mixed by different percentages of tall fescue (Festuca arundincea L.) and kentucky bluegrass (Poa pratensis L.) was conducted. The results show that in moist subtropical zones, the higher the proportion of tall fescue, the more stable the community (20%?KB+80%?TF40%?KB+60%?TF60%?KB+40%?TF80%?KB+20%?TF), and the narrower the blades of grass at the initial growing stage. As the percent of tall fescue shoots increases per unit area, the width of blades of tall fescue in different mixture is the identical, and any discrepancy in the average growth speed is not obvious.

AbstrcatThere are many kinds of ecological effects of establishing large-scale artificial grassland.It is the most sufficient way to recover vegetation,to prevent soil and water erosion,and to improve ecological environment.

(接上期) 5.2 颜色特征 5.2.1 体表颜色。典型的凉山黑羽乌骨鸡全身羽毛黑色,富有光泽,冠、脸、耳、喙、肉垂、耳叶、胫、趾、皮肤均呈黑色。 5.2.2 体内颜色。肉、内脏细膜、腹脂、气管、食管及嗉囊、肠、生殖器官、泄殖腔黏膜、血管、舌及口腔黏膜呈乌黑色。肺红中带黑,肝脏鲜红。骨膜乌黑,骨质稍乌。 5.2.3 屠宰测定发现,鸡体皮质的乌黑程度与体内各部乌黑度表现程度较一致,体表部分越乌黑、体内各部分的乌黑度越好,表明互相间呈正相关关系。