Palatability of tannin-rich sericea lespedeza fed to broilers     

《The Journal of Applied Poultry Research》2012,21(4):891-896

  相似文献   

Management options to decrease phosphorus and sediment losses from irrigated cropland grazed by cattle and sheep     

R. W. McDowell  & D. J. Houlbrooke 《Soil Use and Management》2009,25(3):224-233

In southern New Zealand, grazing of forage crops is common practice to satisfy feed requirements of animals in winter when pasture growth is limited. This practice has been shown to cause soil physical damage and increased loss of surface water contaminants sediment and phosphorus (P) to water bodies. Strategies to mitigate the loss of sediment and P were trialled on a Pallic soil type (Aeric Fragiaquept) in the North Otago Rolling Downlands of New Zealand. All sites were irrigated and measurements were made of losses in overland and sub‐surface flow from intensive cattle or sheep grazed, winter forage crops, and sheep grazed pasture. Two mitigations (restricted grazing of crop to three hours and the application of aluminium sulphate) were assessed for their potential to decrease contaminant loss from cropland. Volumes of surface runoff and loss of total P, filterable reactive P and sediment showed significant differences (P < 0.05) between the control treatments (i.e. no mitigation) with cattle crop (88 mm surface runoff) > sheep crop (67 mm) > sheep pasture (33 mm). The contribution of irrigation water to overland flow water, as a result of saturation‐excess conditions, varied between treatments with more loss under cattle crop (20% of total) compared with sheep crop (15%) and sheep pasture (11%). These differences are probably an effect of soil physical condition and highlight the importance of accurate irrigation scheduling to keep soil moisture below field capacity. Restricted winter grazing and alum application after grazing significantly (P < 0.05) decreased P losses in surface runoff under cattle (from 1.4 to 0.9 kg P/ha) and sheep (from 1.0 to 0.7 kg/P/ha) grazed crop plots by about 30%. In cattle grazed plots, restricted grazing also decreased suspended sediments (SS) by 60%. The use of restricted grazing is suggested as a means of decreasing P and SS loss from grazed winter forage crops. The use of alum shows some promise for decreasing P losses, but requires further work to determine its long‐term effectiveness and use in other soils and management regimes.  相似文献   

用钙电极测定牧草中钙含量的方法研究   总被引：1，自引：0，他引：1  

刘福林 《草业科学》1996,13(6):24-25

用钙电极测定禾本科牧草中钙含量的方法，回收率１００．０２％－９７．３８％，用高酸钾法的ＥＤＴＡ法与钙电极法作比较试验，结果非常满意。  相似文献   

龙羊峡库区天然草地动态分析   总被引：5，自引：1，他引：4  

杜铁瑛  辛玉春 《草业科学》2003,20(3):13-17

利用美国陆地卫星T.M图象,对龙羊峡水库库区的天然草地进行了对比分析。结果表明,天然草地面积减少7084.09hm^2。其中减幅较大的为温性草原类和温性荒漠类,10年中分别减少了7299.27hm^2和1015.65hm^2。另外,草地盖度,牧草高度和草地产量也有下降,其中草地盖度下降5%-15%;牧草种数减少4-20种;牧草产量下降73.5-1090.05kg/hm^2。并对变化原因作了分析,提出了治理措施。  相似文献   

The Effect of Supplementation with Fresh Browse of Ziziphus mauritiana or Combretum aculeatum on Feed Intake,Nitrogen Utilization and Growth of Grazing Range Sheep     

Sangaré M  Fernández-Rivera S  Hiernaux P  Pandey VS 《Tropical animal health and production》2003,35(5):465-476

The influence of 0, 60 or 120 min access to a grove of either Ziziphus mauritiana (Ziziphus) or Combretum aculeatum (Combretum) on forage intake and on the digestibility, growth and excretion of nutrients was determined using 40 Oudah rams grazing for 7 h/day on poor-quality dry season pasture in the Sahel. The effects of browse species and browsing duration (0, 30, 60 or 120 min) on the ruminal ammonia content were also evaluated using 8 mature fistulated rams. Ziziphus increased both total digestible organic matter and total dry matter intakes per (kg live weight)^0.75 without decreasing herbage intake, whereas 60 or 120 min access to Combretum reduced herbage intake by 6.3% and 4.2%, respectively. The digestibility of the diet decreased (p<0.05) with the duration of access to the groves. Despite the provision of more nitrogen (N) than in the control diet, ruminal NH₃-N decreased 24 h after browsing commenced. The reduced live weight gain of sheep browsing Combretum may indicate more deleterious compounds in Combretum than in Ziziphus. Ziziphus appears to have more potential than Combretum to increase sheep production in low-input crop/livestock systems.  相似文献   

The Effect of Anthelmintic Capsules on the Egg Output and Larval Viability of Drug-resistant Parasites     

Sutherland IA  Brown AE  Leathwick DM 《Veterinary research communications》2003,27(2):149-157

Challenge with an equal mix of drug-resistant and drug-susceptible larvae of Teladorsagia circumcincta resulted in infections in groups of lambs (n = 6) either untreated or given controlled-release capsules, containing either albendazole or ivermectin. Lambs treated with albendazole capsules contained similar numbers of adult worms at necropsy to the other groups but had no detectable faecal egg count. Animals treated with ivermectin capsules had similar worm burdens and faecal egg counts to the control group but the worms had significantly higher numbers of eggs in utero. These results provide evidence for suppression of egg production by both anthelmintic treatments. The observation that albendazole caused a significant reduction in the developmental success of parasite eggs also has implications for the use of faecal egg count as an indicator for pasture contamination with resistant parasites. In two further groups of lambs, either untreated or given albendazole capsules, treatment caused a significant reduction in egg count and adult worm burden of Trichostrongylus colubriformis. No significant effects were observed on in utero egg counts or egg viability and the apparent effect on the number of eggs produced in faeces per adult female was not significant (p = 0.077). There was, therefore, no evidence that albendazole controlled-release capsules caused suppression of egg output in this species.  相似文献   

高寒牧区陶赛特绵羊鲜胚移植试验观察     

雷有鹏  马增义  何成基  祁文珍  朱俊  孔祥颖 《中国草食动物》2007,27(6):36-37

选取兰州信合牧业34只陶赛特绵羊为供体，采用递减法注射FSH进行超排，采用人工授精配种，30只长途运输到青海省海北州西海镇手术法回收胚胎，鉴定后移值。155只藏系绵羊作为受体，采用两次PG注射进行同期发情，119只受体在西海镇移植，32只长途运输到甘肃兰州信合牧业进行移植。结果表明：34只供体获得胚胎共168枚，每只供体平均获得4．94枚，合格率89．88％，151只受体表现发情，发情率为97．42％。其中．在西海镇移植的119只产羔73只，产羔率为61．34％，在兰州移植的32只产羔21只，产羔率为65．6％。  相似文献   

内蒙古东北部天然牧草生态气候适应性研究   总被引：8，自引：0，他引：8  

赵慧颖 《干旱地区农业研究》2006,24(5):164-169

应用积分回归、模糊数学中隶属函数和地理信息系统,对内蒙古东北部的天然牧草进行分区生态气候适应性综合评价。分析表明:牧草的自然生态适应性在半干旱、干旱环境中明显不如湿润、半湿润地区;对天然牧草的资源总量、生态系统进行了系统辩识;以定量、客观的方法分析和评价牧草气候资源区域分布特征,揭示出了资源的总体状况和各气候生态要素间的相互匹配情况。可为制定畜牧业发展规划提供决策依据。  相似文献   

Appropriateness of inexpensive, hand-held global positioning system units for creating weed maps in a pasture     

MAMORU NASHIKI  HIRONOBU NARITA  YUMI HIGASHIYAMA 《Weed Biology and Management》2006,6(4):183-188

This paper describes the practical use of a global positioning system receiver (hand-held GPS) as a means of measuring and describing pasture areas invaded by weeds. The accuracy of two GPS units, a hand-held GPS with an external antenna (GPS with an antenna) and the differential global positioning system receiver (DGPS), were examined in Morioka, northern Japan. In addition, an area of weed patches and a pasture, determined using the GPS with an antenna, were compared to the measurements made with a conventional tape and a weed map was created based on the coordinate data of latitude and longitude measurements. The accuracy of the GPS with an antenna was poor (8.3 m); however, the precision of the unit was reasonable in measuring area. An area estimation error by the GPS with an antenna was 7% when practically measuring weed patches of 141 m² and 1% in a paddock of 12 566 m². From these results, it appears that the GPS with an antenna might have an acceptable error in measuring areas for weed control in a pasture. A weed map produced from the coordinate data surveyed using the GPS with an antenna enables the state of weed growth and its domination in an area of pasture to be visually understood. Therefore, GPS technologies easily can be applied to quickly obtain information on weed infestation.  相似文献   

城市生态环境与城市园林绿化     

魏左平  魏金平  李青丰 《北方园艺》2007,(4):166-168

从城市化给城市带来的一系列环境问题以及城市园林绿化建设的重要性出发,分析建立“城市生态绿化新优良种示范基地”的意义及综合效益.  相似文献