共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
内蒙古自治区农作物秸秆资源及其利用潜力的研究 总被引:1,自引:0,他引:1
内蒙古自治区农区、半农半牧区的农作物秸秆资源很丰富。每年总产量约139.18亿kg,但目前农作物秸秆的饲草料利用率低很,仅10% ̄20%左右,全区农作物秸秆的饲草利用率每提高10%,就能解决90.68万羊单位/年的粗饲料,就等于全区现有天然草地面积又增加3.4%(216.13万hm^2)或增加3.4%的载畜量。对缺草料的农区、半农半牧区来说,秸秆是开发潜力很大的草业资源。充分开发利用农作物秸秆资源 相似文献
3.
4.
多渠道提高粗饲料的利用率 总被引:1,自引:0,他引:1
我国是一个农业大国,有着极其丰富的粗饲料资源。2005年,我国玉米播种面积为11583.0万hm^2.小麦为8648万hm^2,薯类为3514万hm^2,仅这些农作物收获后剩余的秸秆一项就高达6亿t,占世界秸秆产量的20%-30%。如果这些粗饲料经过处理加工后用于畜牧业生产,将是一个潜在的饲料来源。 相似文献
5.
生物技术在处理农作物秸秆饲料中的应用 总被引:28,自引:1,他引:27
我国是一个农业大国,农作物播种面积居世界第一。每年秸秆产量达57亿t,占世界秸秆总产量的20%~30%,而目前用于饲料部分还不足10%。所以,如何处理秸秆提高其饲用价值是当今畜牧业的重点课题。近年来用生物技术处理农作物秸秆的报道很多,本文根据处理秸... 相似文献
6.
谷草的营养特点及开发利用 总被引:2,自引:0,他引:2
作为非竞争性饲料资源.农作物秸秆价格低廉,是反刍动物极好的饲料。秸秆是农作物光合作用的产物,贮存有丰富的营养物质.是宝贵的粗饲料来源。我国每年约生产6~8亿吨作物秸秆.约占世界秸秆总量的20%~30%,且种类繁多.所含粗蛋白质总量约0.2亿吨.相当于2.5亿吨玉米所含蛋白质的总量。 相似文献
7.
碱化秸秆的工业化生产技术 总被引:3,自引:0,他引:3
碱化秸秆的工业化生产技术国内贸易部郑州科学研究设计院王仁振一、国内外秸秆资源的利用现状1.国内秸秆资源的利用现状我国秸秆资源十分丰富。据统计,全国年产各类农作物秸秆达5.7亿吨,其数量相当于北方草原打草量的50多倍,占全世界秸秆总产量的20%~30%... 相似文献
8.
秸秆资源作饲料的开发与利用 总被引:5,自引:0,他引:5
秸秆资源作饲料的开发与利用吴克谦(中国农业科学院畜牧研究所,北京100094)农作物秸秆是一种潜在的非竞争资源,在我国具有数量大、分布广、种类多的特点,据近年估计各类秸秆总数约5.7亿t[1]。秸秆也是每一个农业生产国家拥有的可利用资源之一。据FAO... 相似文献
9.
10.
对开发利用江苏省秸秆饲料资源的认识与思考孙宏进(江苏省农林厅畜牧局210024)农作物秸秆占作物地上部分的3/41/2,是一大综数量可观的非常规饲料资源,我省是典型的农区,每年约有秸秆35004000万吨。目前农作物秸秆除用于燃料、还田、直接饲用和少... 相似文献
11.
12.
魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
13.
14.
本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
15.
REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
16.
17.
18.
19.
以国际标准强毒R株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离MG,并收集感染鸡所产蛋分离MG。结果表明,人工感染48小时后上、下呼吸道及肺已被全面感染,96小时气囊已被感染,120小时输卵管已能分离到MG,卵巢始终分离不到MG。人工感染鸡自144小时便能在其所产蛋中分离出MG。药物治疗能在72小时内消除感染,油乳剂苗则需24天后逐渐降低蛋内MG分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内MG,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
20.
Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献