共查询到20条相似文献，搜索用时 62 毫秒
1.
2.
3.
尖叶胡枝子和达乌里胡枝子地上生物量随生育期的进程在不断增加,尖叶胡枝子最大生物量出现在开花期,达乌里胡枝子出现在结实期;在分枝期和孕蕾期叶/茎>1,其中分枝期尖叶胡枝子和达乌里胡枝子叶的比重分别占地上总生物量的71.26%和70.94%,孕蕾期叶比重略低于分枝期.开花期和结实期,随着花果的出现,花果的比重迅速上升,叶比重迅速下降;地上生物量的垂直分布近于菱形,在孕蕾期尖叶胡枝子和达乌里胡枝子生物量主要集中于10～30 cm和20～50 cm处;尖叶胡枝子枝条主要以中、细枝为主,约占总枝条量的66.71%～67.67%.而达乌里胡枝子以粗、中枝为主,约占枝条总量的78.39%～82.89%;枝条的垂直分布尖叶胡枝子和达乌里胡枝子粗枝主要集中在0～20 cm,中、细枝集中分布在20～40 cm. 相似文献
4.
尖叶胡枝子营养成分研究 总被引：6，自引：0，他引：6
研究生长2年和3年的尖叶胡枝子(Lespedega hedysaroides)营养成分及茎叶比.结果表明:尖叶胡枝子粗蛋白质含量11.12%～15.08%、粗脂肪1.69%～2.48%、粗纤维22.83%～33.87%、无氮浸出物37.61%～49.13%、钙1.61%～1.98%、磷0.88%～1.22%、胡萝卜素20.75～94.47 mg/kg、茎叶比为1:1.53～1:2.48;同时比较研究尖叶胡枝子营养成分与达乌里胡枝子、截叶铁扫帚和二色胡枝子的差异. 相似文献
5.
2种胡枝子牧草生物量及草层结构变化研究 总被引：1，自引：0，他引：1
尖叶胡枝子和达乌里胡枝子地上生物量随生育期的进程在不断增加,尖叶胡枝子最大生物量出现在开化期,达乌里胡枝子出现在结实期;在分枝期和孕蕾期叶/茎>1,其中分枝期尖叶胡枝子和达乌里胡枝子叶的比重分别占地上总生物量的71.26%和70.94%,孕蕾期叶比重略低于分枝期。开花期和结实期,随着花果的出现,花果的比重迅速上升,叶比重迅速下降;地上生物量的垂直分布近于菱形,在孕蕾期尖叶胡枝子和达乌里胡枝子生物量主要集中于10~30cm和20~50cm处;尖叶胡枝子枝条主要以中、细枝为主,约占总枝条量的66.71%~67.67%。而达乌里胡枝子以粗、中枝为主,约占枝条总量的78.39%~82.89%;枝条的垂直分布尖叶胡枝子和达乌里胡枝子粗枝主要集中在0~20cm,中、细枝集中分布在20~40cm。 相似文献
6.
7.
3种胡枝子根系生长特性及根干重的研究 总被引：2，自引：1，他引：2
对3种胡枝子的根干重及根系生长特征的研究结果表明,尖叶胡枝子,达乌里胡枝子和二色胡枝子具有较大的根干重,在100cm的土层范围内分别达到3472．05,3060．07和8795．66kg／hm^2,根系以粗、中根为主;根干重主要集中在0～20cm的耕作层中,分别占总根量的77．73％,72．289／5和89．02oA;30～50cm的土层中细根占较大比例,分别达到42．91％～5．35％,86．09％～95．41％和71．91％～93．6％。 相似文献
8.
通过研究生物添加剂对灌木青贮中有机酸含量和pH值的影响，寻找适合灌木青贮的生物添加剂。利用上年平茬的整株华北驼绒藜、柠条锦鸡儿、尖叶胡枝子和山竹岩黄芪分别添加青宝Ⅱ号、采禾和纤维素酶以及无添加剂（对照）进行青贮。结果表明：柠条锦鸡儿、尖叶胡枝子和山竹岩黄芪添加纤维素酶青贮，华北驼绒藜对照组的乳酸含量最高；柠条锦鸡儿添加纤维素酶青贮、尖叶胡枝子添加青宝Ⅱ号青贮、华北驼绒藜对照组和山竹岩黄芪添加采禾青贮的乙酸含量最低；柠条锦鸡儿、尖叶胡枝子和山竹岩黄芪添加纤维素酶青贮，华北驼绒藜添加采未青贮的丙酸含量最低；所有处理的丁酸含量均为0。添加纤维素酶对改善柠条锦鸡儿、尖叶胡枝子和山竹岩黄芪三种灌木的青贮效果最佳；添加生物添加剂对华北驼绒藜的青贮效果无改善。 相似文献
9.
日粮粗纤维水平对断乳力克斯兔营养物质消化率的影响 总被引：1，自引：0，他引：1
为探讨断乳兔日粮适宜的粗纤维水平,选择35日龄断乳的力克斯兔40只,随机分成A、B、C、D4组,每组10只,在等能等氮的基础上,分别饲喂粗纤维含量为7％、9％、12％和14％的日粮。研究表明：试验兔日增重分别为23．92±2．68g、25．23±2．49g、27．74±2．90g和25．70±3．37g,以C组最高,但差异不显著（P〉0．05）;平均料肉比分别为2．95：1、2．94：1、2．87：1和3．4：1,以C组最佳;平均日采食量分别为70．5g、74．26g、79．82g和87．38g,即随粗纤维含量的增加采食量递增（P〈0．05）;粗蛋白、粗脂肪、粗灰分和无氮浸出物的消化率以粗纤维为12％的C组最高,而且D组各养分的消化率均极显著地低于C组（P〈0．01）。但粗纤维水平由12％增加到14％,各种养分的消化率均下降,尤其是粗蛋白消化率的下降幅度达极显著水平（P〈0．01）。粗纤维的消化率随着日粮粗纤维含量的增加而降低;盲肠内容物各营养素的含量受日粮粗纤维水平的影响,与营养物质的消化率相吻合。本试验条件下,断乳兔日粮适宜的粗纤维水平为12％。 相似文献
10.
重庆市部分地区牛传染性鼻气管炎和流行性牛白血病的血清学调查 总被引：1，自引：0，他引：1
为了解传染性鼻气管炎（IBR）和流行性牛白血病（BL）的流行情况，从重庆市辖区内11个区县（自治县）采集奶牛、黄牛、水牛血清共；369头份，用酶联免疫吸附试验（HLISA）检测IBR和BL抗体。结果从部分区县（自治县）检测出阳性样品，IBE阳性率介于2．70％～20．00％之间，总阳性率为4．61％；奶牛、黄牛、水牛总阳性率分别为5．34％、4．92％、0％。BL阳性率介于2．70％～52．50％之间，总阳性率为12．20％，奶牛、黄牛、水牛总阳性率分别为20．87％、1．64％、0％，提示该病在我市奶牛和黄牛牛群中存在，污染较广，应引起重视。 相似文献
11.
Rassnick KM Gieger TL Williams LE Ruslander DM Northrup NC Kristal O Myers NC Moore AS 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2001,15(3):196-199
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks. 相似文献
12.
Davis MS Willard MD Nelson SL Mandsager RE McKiernan BS Mansell JK Lehenbauer TW 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(3):311-314
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large. 相似文献
13.
Furosemide continuous rate infusion in the horse: evaluation of enhanced efficacy and reduced side effects 总被引：1，自引：0，他引：1
Johansson AM Gardner SY Levine JF Papich MG LaFevers DH Fuquay LR Reagan VH Atkins CE 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(6):887-895
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses. 相似文献
14.
Waruiru RM Thamsborg SM Nansen P Kyvsgaard NC Bogh HO Munyua WK Gathuma JM 《Tropical animal health and production》2001,33(3):173-187
The epidemiology of H. placei and of other gastrointestinal nematodes in yearling dairy cattle was examined on two farms in Kiambu District, central Kenya during each of 13 one-month periods from April 1993 to April 1994. On each farm, 32 newly weaned dairy calves were given a single dose of albendazole and then placed on experimental pastures. Twelve of the animals were designated for bi-monthly slaughter (n = 2) and analysis of worm population characteristics and 20 were designated for blood and faecal collection and for weighing. Two parasite-free tracer calves were grazed alongside the weaner calves each month throughout the study period and were also slaughtered for analysis of worm populations. Faecal egg counts, haematological and serum pepsinogen determinations, herbage larval counts, and animal live weight changes were recorded monthly. The study revealed that Haemonchus placei, Trichostrongylus axei, Cooperia spp. and Oesophagostomum radiatum were responsible for parasitic gastroenteritis and that H. placei was the predominant nematode present in the young cattle on both farms. Faecal egg counts from resident cattle and necropsy worm counts revealed that pasture larval levels were directly related to the amount of rainfall. The total worm burdens in the animals were highest during the rainy season (March–June and October–December) and lowest during the dry seasons (July–September and January–February). The very low recovery of immature larvae of H. placei from the tracer calves indicated that arrested development is not a feature of the life cycle of this parasite in central Kenya. The maintenance of the parasite population depended on continuous cycling of infection between the host and the pasture. The agroclimatic conditions of the study area were such that, in general, favourable weather conditions for the development and survival of the free-living stages of gastrointestinal nematodes existed all year round. 相似文献
15.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host. 相似文献
16.
17.
Evaluation of biohydrogenation rate of canola vs. soya bean seeds as unsaturated fatty acids sources for ruminants in situ 
下载免费PDF全文
下载免费PDF全文 S. Pashaei T. Ghoorchi A. Yamchi 《Journal of animal physiology and animal nutrition》2016,100(2):211-216
An experiment was conducted to study disappearance of C14 to C18 fatty acids, lag times and biohydrogenation (BH) rates of C18 fatty acids of ground soya bean and canola seeds in situ. Three ruminally fistulated Dallagh sheep were used to determine ruminal BH of unsaturated fatty acids (UFAs). Differences in the disappearance of fatty acids through the bags and lag times were observed between the oilseeds. We saw that the longer the incubation time of the oilseeds in the rumen, the lower the content of C18:2 and C18:3. Significantly higher lag times for both C18:2 and C18:3 were observed in ground canola compared to ground soya bean. BH rates of C18:2 and C18:3 fatty acids in soya bean were three times higher than those of canola. These results suggest that the fatty acid profile of fat source can affect the BH of UFAs by rumen micro‐organisms. So that UFAs of canola had higher ability to escape from ruminal BH. It seems that fatty acid profile of ruminant products is more affected by canola seed compared to soya bean seed. 相似文献
18.
Serum biochemical values and the wet weight to dry weight ratios of tissues were determined in yaks in Shandan county of Gansu province. The liver, kidney, heart and muscle contents of seven elements in yaks were also analysed. Most serum biochemical values were similar to those of cattle, camels and sheep, but the calcium concentration was considerably above the normal range for other ruminants. The liver contained the highest concentrations of copper, manganese and cobalt and the kidney of selenium, iron and calcium.Abbreviations Alb
albumin
- ALT
alanine aminotransferase
- AST
aspartate aminotransferase
- BUN
blood urea nitrogen
- Chol
cholesterol
- Glob
globulin
- -GT
-glutamyl transpeptidase
- IP
inorganic phosphorus
- TP
total protein 相似文献
19.
正We are pleased to publish the second special issue on avian brood parasitism and to be responsible guest editors for the two special issues of Chinese Birds (Vol. 3, No. 4, 2012 and Vol. 4, No. 1, 2013), entitled "Avian Brood Parasitism - A Growing Research Area in Behavioral Ecology". The first issue was published in December 2012. The goal of the two special issues is to publish accumulated knowledge and some of the recent developments in 相似文献
20.
Tropical Animal Health and Production - 相似文献