共查询到20条相似文献，搜索用时 78 毫秒
1.
草坪型多年生黑麦草种子产量与主要农艺性状的通径分析 总被引：2，自引：0，他引：2
对草坪型多年生黑麦草６个农艺性状与种子产量进行了相关,回归和通径分析。结果表明,种子产量与株高相关不显著,而与另５个性状均呈显著正相关,相关系数大小依次为单株穗数〉每穗小穗数〉绿叶干重〉穗长〉穗粒数〉株高。有４个性状对单株种子产量贡献较大,其大小依次为单株穗数〉每穗小穗数〉绿叶干重〉株高。株高的效应是负值。 相似文献
2.
3.
4.
11个燕麦品种种子产量与主要农艺性状的通径分析 总被引：4，自引：0，他引：4
为探讨宁夏引黄灌区高产燕麦品种的影响因素,研究选取11个燕麦(Avena sativa)品种的9个主要农艺性状与种子产量进行相关和通径分析。结果表明:9个农艺性状与单株种子产量相关系数大小依次为有效分蘖数每小穗小花数单穗重株高枝梗数每穗节数穗长每小穗粒数每节穗数;逐步回归筛选出的7个性状与单株种子产量做通径分析,其直接效应大小顺序为:有效分蘖数每小穗粒数单穗重每穗节数株高每小穗小花数穗长,而株高则表现为负效应;综合考虑,‘牧马人’应为当地首推燕麦品种。 相似文献
5.
6.
野生扁蓿豆单株种子产量与主要农艺性状的通径分析 总被引：1，自引：0，他引：1
对扁蓿豆(Medicago ruthenica)的9个农艺性状与单株种子产量进行通径分析,明确农艺性状对种子产量影响的主要因子,为扁蓿豆种子高产及其产量因子作用机理研究提供科学依据。结果表明:单株种子产量与各性状的相关系数大小顺序依次为:单枝花序数>花序种子数>种子宽>株高>千粒重>花序结荚数>花序花朵数>种子长>生育期;9个性状与单株种子产量的直接通径系数大小依次为:单枝花序数>花序种子数>千粒重>种子长>株高>种子宽>花序花朵数>花序结荚数>生育期。单枝花序数对种子产量的贡献最大,花序种子数次之,其他性状的效应较小。因此,为提高扁蓿豆种子产量首先应着力增加单枝花序数,其次增加花序种子数,适当兼顾千粒重的提高。 相似文献
7.
8.
柠条种子产量与主要农艺性状的通径分析 总被引：8，自引：0，他引：8
对柠条的7个农艺性状和单株种子产量进行了相关和通径分析。结果表明，在7个农艺性状中除果层高外其它性状都与单株种子产量呈显著或极显著正相关。7个农艺性状对单株种子产量的直接通径系数依次为：每序结荚数（X5）＞每序小花数（X4）＞每株花序数（X3）＞千粒重（X7）＞果层高（X1）＞每株丛单株数（X2）＞每荚种子粒数（X6）。要提高种子产量，首先应提高每花序结荚数。 相似文献
9.
为了探讨施肥量对达乌里胡枝子单株种子产量的影响,试验对"晋农1号"达乌里胡枝子施加了氮肥(75,125,175 kg/hm~2)、磷肥(50,100 kg/hm~2)和钾肥(75,150 kg/hm~2),测定了株高、分枝数、每枝花序数、每花序结荚数、千粒重及单株种子产量,并进行了相关性分析、逐步回归分析和通径分析。结果表明:施肥显著影响达乌里胡枝子单株种子产量(P0.05);产量构成因素的6个性状与单株种子产量相关系数大小依次为二级分枝数每枝花序数每花序结荚数株高千粒重一级分枝数;用逐步回归分析筛选出的3个性状与单株种子产量做通径分析,其直接效应大小顺序为二级分枝数每枝花序数每花序结荚数。说明施加175 kg/hm~2氮肥+50 kg/hm~2磷肥+150 kg/hm~2钾肥时可以使达乌里胡枝子单株种子产量增加。 相似文献
10.
为了研究青贮玉米农艺性状对产量的影响,本试验以高玉2300、翔玉998、铁研53、五谷703、优迪919、翔玉198这6个品种为材料,采用随机区组设计,利用SPSS统计软件,对青贮玉米生物产量和农艺性状进行相关性分析。结果表明,青贮玉米生物产量与株高、茎重、叶片数、叶重、穗长、单株鲜重呈正相关,与茎重、叶重、单株鲜重的相关系数平均约达0.8,而与茎粗、单穗重、果穗数、穗粗呈负相关。指出在大通地区种植青贮玉米,提高株高、茎重、叶片数、叶重、穗长、单株鲜重并兼顾其他农艺性状是增加青贮玉米产量的有效途径。 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