不同营养水平对地方鸡种部分性状的影响   总被引：2，自引：0，他引：2  

张顺珍  包承玉 《中国家禽》1997,(4):4-6

本研究采用饲养试验、屠宰测定和肉质分析的方法，比较了三种不同营养水平日粮对地方鸡种（泰和鸡、黑羽乌骨鸡、中型黄鸡）生长性能和肉质的影响。各鸡种随机分成（Ⅰ、Ⅱ、Ⅲ）三组，分别饲喂高、中、低三种能量和蛋白质水平日粮。结果表明，高能和高蛋白日粮可提高乌骨鸡的增重速度，尤其在２８日龄前明显。中型黄鸡的增重以饲喂中等营养水平日粮为高，三组受试鸡的饲料转化率都以使用高营养水平日粮最优，同时单位增重花费的饲料成本最低。日粮营养水平对肉质有一定程度的影响，低能低蛋白日粮组鸡的肉质优于高能高蛋白日粮组鸡，各组试验鸡的肉质测定值都在优质鸡肉质标准范围之内。  相似文献   

雏鸡长度:评定孵化质量的新参数     

Ron Meijerhof  刘向萍 《中国家禽》2007,29(2):33-33

最近的研究表明,在新生雏鸡长度与后期生长性能之间存在正相关,这个结果为如何评价雏鸡质量又提供了一个新的参数。  相似文献   

Response of multiple seeded cocklebur and other cocklebur types to herbicide treatment     

Abbas HK  Johnson BJ  Pantone DJ  Wax LM  Hine R  Shier WT 《Pest management science》2005,61(7):643-648

Multiple seeded cocklebur has been found in the last decade in Texas, and described as a biotype of Xanthium strumarium L with up to 25 seeds per bur instead of the usual two. The multiple seeded bur typically produces up to nine seedlings, causing concern that it may be harder to control than normal seeded common cocklebur. The efficacies of a series of fungal and conventional commercial herbicides have been compared in the greenhouse on seedlings of multiple seeded cocklebur from Texas (MSC-TX) and normal common cockleburs from Texas (NCC-TX), Arkansas (NCC-AR), Illinois (NCC-ILL) and two from Mississippi (NCC-MS#1, NCC-MS#2). Three measures of herbicidal activity (reductions in plant height and dry weight, and mortality) were used. The fungal herbicide Alternaria helianthi (Hansf) Tubaki & Nishihara at 1 x 10(5) conidia ml(-1) + 2 g liter(-1) Silwet L-77 with an 8-h dew period was an effective herbicide with all biotypes, as were the commercial chemical herbicides chlorimuron (14.8 g ha(-1)), imazaquin (29.6 g ha(-1)), sodium hydrogen methylarsonate (MSMA; 279.1 g ha(-1)) and imazethapyr (39.5 g ha(-1)). The membrane-disrupting organic arsenical MSMA was effective with all biotypes, whereas commercial chemical herbicides which act by inhibiting branched-chain amino acid synthesis (chlorimuron, imazaquin and imazethapyr) were less effective against normal seeded common cocklebur biotypes with short stature. These studies showed that multiple seeded cocklebur was at least as susceptible to the biological agent A helianthi and to the conventional commercial herbicides studied as were normal seeded cockleburs, suggesting that existing methods should be adequate to control this novel biotype.  相似文献   

The efficacy of spinosad against the western flower thrips, Frankliniella occidentalis, and its impact on associated biological control agents on greenhouse cucumbers in southern Ontario   总被引：1，自引：0，他引：1  

Jones T  Scott-Dupree C  Harris R  Shipp L  Harris B 《Pest management science》2005,61(2):179-185

Insecticides are the most commonly used tactic to control western flower thrips (WFT), Frankliniella occidentalis Pergande (Thysanoptera: Thripidae), on greenhouse cucumber. However, WFT has developed resistance to several of the insecticides presently in use. In addition, some of these insecticides adversely affect greenhouse biological control agents used to control WFT, resulting in subsequent pest resurgence. Therefore, there is a need to identify novel insecticides with unique modes of action for use in integrated pest management (IPM) programs to effectively control WFT with minimal impact on associated biological control agents. In laboratory bioassays conducted in 2001, immature and adult WFT and three associated greenhouse biological control agents: Amblyseius cucumeris Oudemans (Acarina: Phytoseiidae), Orius insidiosus Say (Hemiptera: Anthocoridae) and Encarsia formosa Gahan (Hymenoptera: Aphelinidae) were exposed to direct, direct/residual, and residual contact applications of the novel biopesticide, spinosad (Conserve 120 SC), and the industry standard for whitefly control, endosulfan (Thiodan 50 WP). In all three types of assay, spinosad was effective against immature and adult WFT life stages. It showed low toxicity to A. cucumeris, moderate toxicity to O. insidiosus and high toxicity to E formosa. Greenhouse studies involving exposure of immature and adult WFT and adult biological control agents to cucumber leaves sprayed previously with spinosad supported the laboratory data. Spinosad showed low toxicity to A. cucumeris exposed to leaves 1 day after treatment (DAT), moderate toxicity to O. insidiosus 1 and 8 DAT, and high toxicity to E. formosa up to 28 DAT. These data, along with spinosad's unique mode of action, suggest it would be a valuable reduced-risk control agent for greenhouse cucumber IPM programs.  相似文献   

The longevity of hydatid cysts in horses     

O Ronéus  D Christensson  N G Nilsson 《Veterinary parasitology》1982,11(2-3):149-154

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A challenge for the profession          下载免费PDF全文

Ron Taylor 《The Canadian veterinary journal. La revue veterinaire canadienne》1991,32(7):393-394

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Forensic pathology of canadian bread wheat: the case of tan spot     

Lamari L  McCallum BD  Depauw RM 《Phytopathology》2005,95(2):144-152

ABSTRACT Pyrenophora tritici-repentis causes necrosis and chlorosis in its wheat host. Susceptibility to races 2 (necrosis) and 5 (chlorosis) of the pathogen is known to be mediated by Ptr ToxA and Ptr ToxB, respectively. Sensitivity to each toxin is controlled by a single dominant and independently inherited gene. We used sensitivity to Ptr ToxA and Ptr ToxB as two genetic markers to investigate the origin and the state of tan spot susceptibility in Canadian Western Red Spring (CWRS) wheat over a period of more than a century. Sensitivity to Ptr ToxA, the toxin produced by nearly all isolates of the pathogen collected in the past 20 years in western Canada, appears to have been present in the first major cultivar, Red Fife, grown massively in the late 1800s. Sensitivity then was transmitted unknowingly into Canadian wheat lines through extensive use of backcrossing to maintain the Marquis-Thatcher breadmaking quality. Sensitivity to Ptr ToxA, which nearly disappeared from cultivars grown in western Canada in the 1950s, was reintroduced in the 1960s and unintentionally bred into many of the present-day cultivars. Sensitivity to Ptr ToxB, a toxin rarely found in isolates from western Canada, appeared with the release of Thatcher in 1934 and was transferred to many cultivars through backcross programs. In spite of large areas planted to Ptr ToxAand Ptr ToxB-sensitive cultivars over decades, tan spot epidemics remained sporadic until the 1970s. The results of this study raise the problem of the narrowing genetic base of CWRS wheat lines and the potential for unanticipated threats from plant pathogens. The intercrossing of genetically diverse material in one Canadian wheat breeding program resulted in the release of several modern cultivars with resistance to tan spot. The absence of wild-type Ptr ToxB-producing isolates in western Canada remains unexplained, given that sensitivity to Ptr ToxB was present continuously in western Canadian cultivars grown on vast areas for more than 70 years.  相似文献   

Mortality in budgerigars associated with a reovirus-like agent     

Manvell R  Gough D  Major N  Fouchier RA 《The Veterinary record》2004,154(17):539-540

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亚洲百合花器官的组培快繁   总被引：4，自引：0，他引：4  

杨薇红  张延龙  童斌杜蕙  杨蓉 《中国农学通报》2004,20(5):193-193

亚洲百合新品种“西农一号”最佳诱导分化培养基为MS+6-BA1.2+NAA0.1;不定芽增殖最佳培养基为MS+6-BA1.0+NAA0.1;最佳生根培养基为1/2MS+NAA0.2。比较花器官不同组织作外植体时诱导分化不定芽的能力,其顺序为花托＞花柱＞花瓣。  相似文献   

Influence of prior determination of baseline minimum alveolar concentration (MAC) of isoflurane on the effect of ketamine on MAC in dogs     

Giacomo Gianotti  Alexander Valverde  Ron Johnson  Melissa Sinclair  Thomas Gibson  Doris H. Dyson 《Canadian journal of veterinary research》2014,78(3):207-213

The objective of this study was to determine if prior measurement of the minimum alveolar concentration (MAC) of isoflurane influences the effect of ketamine on the MAC of isoflurane in dogs. Eight mixed-breed dogs were studied on 2 occasions. Anesthesia was induced and maintained using isoflurane. In group 1 the effect of ketamine on isoflurane MAC was determined after initially finding the baseline isoflurane MAC. In group 2, the effect of ketamine on isoflurane MAC was determined without previous measure of the baseline isoflurane MAC. In both groups, MAC was determined again 30 min after stopping the CRI of ketamine. Plasma ketamine concentrations were measured during MAC determinations.In group 1, baseline MAC (mean ± SD: 1.18 ± 0.14%) was decreased by ketamine (0.88 ± 0.14%; P < 0.05). The MAC after stopping ketamine was similar (1.09 ± 0.16%) to baseline MAC and higher than with ketamine (P < 0.05). In group 2, the MAC with ketamine (0.79 ± 0.11%) was also increased after stopping ketamine (1.10 ± 0.17%; P < 0.05). The MAC values with ketamine were different between groups (P < 0.05). Ketamine plasma concentrations were similar between groups during the events of MAC determination.The MAC of isoflurane during the CRI of ketamine yielded different results when methods of same day (group-1) versus separate days (group-2) are used, despite similar plasma ketamine concentrations with both methods. However, because the magnitude of this difference was less than 10%, either method of determining MAC is deemed acceptable for research purposes.  相似文献