Cholinergic activity of intestinal musclein vitro taken from horses with and without equine grass sickness

Equine grass sickness (EGS) is a pan-dysautonomia of horses that involves central and peripheral neuronal degeneration and ultimately depletion. This is the first reported functional study on the motility of equine intestine taken immediatelypost mortem from horses with EGS. Strips of smooth muscle from the small intestine of healthy and EGS-affected horses were suspended in an organ bath and their motility was measured isometrically. The activity of the cholinergic system was studied. Physostigmine enhanced the motility of all muscle strips. Tissues taken from horses suffering from acute grass sickness (AGS) had the longest latency before a measurable response could be obtained (p<0.05). The ileum appeared to be damaged by EGS to a greater extent than the duodenum. For the duodenal strips the enhanced rate of spontaneous contractions was significant (p<0.05) for both normal tissue and that affected by grass sickness but this was not the case for the ileal strips. Muscarinic receptor sensitivity investigation using bethanecol suggested a hypersensitivity of receptors with AGS material,Abbreviations AGS acute grass sickness - CGS chronic grass sickness - ED₅₀ median effective dose - EGS equine grass sickness - VIP vasoactive intestinal peptide     

广西草地农业实施对策研究

在阐述了草地农业的概念与特征及分析了广西农业的特点与优势的基础上，根据决定农业系统分布的主要因素，提出了建设广西草地农业的战略及意义，并从调整农耕制度、草地改良、调整畜牧业生产结构、在饲料消耗量中提高饲草比例、粗饲料调制、制订草地农业产业政策等方面，就实施草地农业提出了具体对策。     

南方农区草业在中国农业持续发展中的战略地位

在对中国南北自然资源优势进行广泛比较的基础上，通过生产调研和田间试验，剖析了农产品市场国际化后农业生产结构调整将面临的新问题，预示经济复苏后中国居民的食物消费结构将发生根本性转变。根据这些分析，提出发展南方农区草业是提高农业效益、增加农民收入、实现农业持续发展的有效途径。文章最后提出了南方农区草业的发展策略，并针对目前存在的问题，提出了一些可行的配套措施。     

四川高寒牧区多年生牧草混播试验

分析了多年生牧草4个混播组合连续4年的产量,结果表明:在4个组合中,以组合Ⅳ的产量最高,3年(播种当年除外)的平均鲜草产量为54 152.7 kg/hm2,干草产量为12 463.1 kg/hm2,与其他组合的产量差异达极显著水平,为四川省高寒牧区退耕还草以及人工草地的建设提供了科学的草种组合。     

化学灭除苦竹、杂灌配方试验

对威尔柏、草灌净和草甘膦 3种化学药剂灭除苦竹、杂灌的试验研究表明 ,灭除苦竹、杂罐的主导因子均为威尔柏 ,其中灭除苦竹的最佳配方是威尔柏 2 6 7L·hm-2 +草灌净 2 0 0L·hm-2 +草甘膦 8 3L·hm-2 的混合制剂 ;灭除杂灌的最佳配方是威尔柏 2 6 7L·hm-2 +草甘膦 16 7L·hm-2 的混合制剂。生产上应注意 3者的灵活合理使用 ,以提高灭除效果和降低生产成本     

刚察县22种多年生禾草引种试验报告

1999－2001年对22种国内外牧草及野生驯化牧草的物候期进行了田间观察，通过牧草的越冬率、鲜草产量、种子产量、千粒重等综合因素进行分析，认为在青海省刚察县最适宜种植的牧草是本地牧草品种。     

Azuche, Hymenachne amplexicaulis (Rudge) Nees, Forage Genetic Resources for Floodplains in Tropical Mexico

Azuche Hymenachne amplexicaulis (Rudge) Nees is a C₃ grass native to tropical flooded areas in South and Central America with 2n = 2x = 24 chromosomes. During 2002 and 2003, the Graduate College for Agricultural Sciences (CP) and the Mexican Institute for Forestry, Agriculture and Animal Production Research (INIFAP) organized an expedition to collect the genetic diversity of this species within tropical Mexico, in order to preserve and study it under nursery conditions. The collection was performed from Puerto Vallarta to Tapachula on the Pacific and from Palizada, Campeche to Veracruz on the Gulf of Mexico coast, and also crossing sections through the Tehuantepec isthmus and through the Sierra Madre de Chiapas. Ninety sites were sampled, on each, 25 tillers were collected, tagged and stored in a commercial soil mix until establishment of individual plants within 6 l pots. The largest Azuche prairie observed had a 10 ha surface, with the grass limited to small surfaces of up to 0.25 ha. It was not found on places with salty water, even seasonally. The Pacific coastal side is less abundant in niches for this species. Producers’ experience indicated that this grass is beneficial for milk production compared with other forage grasses, mainly C₄, growing in flooded areas. Initial studies of genetic diversity showed wide morphological variation for sprouting ability, leaf width and length among samples. Azuche diversity showed good potential production attributes for farm and wild animals, under flooding tropical savanna conditions.     

同源四倍体高粱与约翰逊草杂交及其后代表现

本试验研究了高梁同源四倍体与约翰逊草边缘杂交的结实性及其后代表现。结果表明，四倍体高梁与约翰逊草正、反交均能结实，而且后代性关遗传较稳定后，具有强大的杂种优势，是一种很有希望的饲料作物。     

浅谈青海省饲草业现状及发展战略

本文对青海省饲草业发展现状进行了深刻阐述,分析、总结了现阶段饲草业发展中存在的突出问题,并结合本省实际,因地制宜地提出了全省饲草业今后的发展战略。     

湟源地区种植青玉米试验

湟源地区是青海省绵羊实行西繁东育的基地之一,但由于饲料资源不足而限制了绵羊繁育规模,我们通过种植青玉米的试验,结果表明,青玉米产量可达到6.50kg/m2,它将为解决绵羊饲料探寻出新的途径.