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排序方式: 共有92条查询结果,搜索用时 15 毫秒
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Slađana Č. Alagić Snežana B. Tošić Mile D. Dimitrijević Jelena V. Petrović Dragana V. Medić 《Communications in Soil Science and Plant Analysis》2016,47(17):2034-2045
Inductively coupled plasma optical emission spectroscopy, in combination with calculation of various biological factors, was used in this study not only for a simple illustration of the present status of some essential and non-essential metals such as copper (Cu), zinc (Zn), nickel (Ni), lead (Pb), arsenic (As), and cadmium (Cd) in the grapevine cultivar Rkatsiteli and wild blackberry from East Serbia but also for the estimation of plant bioaccumulation potentials. Great majority of detected metal concentrations were in normal ranges except in few cases: Zn concentrations were at the level of deficiency in almost all plant parts, and some Cu and As concentrations were at the levels that could be considered phytotoxic. Biological accumulation factors provided very informative data on metal accumulation and translocation in both plants and pointed to low accumulation rates of metals except in the case of Cu, Zn, and As in some wild blackberry tissues. 相似文献
3.
Nguyen Thanh Vu Tran Huu Phuc Nguyen Trung Ky Nguyen Thi Kieu Nga Nguyen Hong Nguyen 《Aquaculture Research》2020,51(4):1381-1387
Sexual dimorphism is widely observed in almost all farmed aquatic animal species but giant freshwater pawn (GFP) is unique, with males characterized by three main morphotypes (blue claw, orange claw and small males) and females by different reproduction status (ovary, berried egg and already‐spawned females). There has been reported evidence that the effect of male morphotype may have masked genetic variation in growth‐related traits, as a result the heritability for male body weight was lower than that estimated in female. A pending question has arisen whether selection should be made in female only. To answer this question, we used an 8‐year data set from a long‐term selection programme (2008–2015) for high growth in this species comprising 106,756 individuals that were offspring of 515 sires and 810 dams. The body weight data of female and male GFP or of each morphotype was treated as a separate trait and a multi‐trait approach was used to estimate genetic correlations for homologous traits between sexes and between morphotypes. Our analysis showed that there were little differences in the heritability estimates between female and male. In female, mature ovary individual displayed higher heritability than berried egg and already‐spawned females. For male, the heritability for blue claw, orange claw and small males were 0.11, 0.06 and 0.00 respectively. Between‐sex genetic correlation was moderate (0.55 ± 0.11) for body weight, suggesting that the trait expressions in female and male may be genetically different. In female, the genetic correlations for body weight among three female types were close to one (0.91–0.94). In contrast, the genetic correlations for body weight between male morphotypes especially between blue claw or orange claw and small males were low (0.15–0.25). Furthermore, we estimated genetic gain as the difference in least square means (LSM) or estimated breeding values (EBV) between the selection line and control group. The genetic gain in body weight was smaller in females than in males. It is concluded that there is no need to run separate breeding programme for female and male GFP. A combined selection using both female and male data can achieve selection response for body weight as demonstrated in the present study. 相似文献
4.
Hibret A Toé F Mukasa-Mugerwa E Kassa T Markos T 《Tropical animal health and production》2001,33(3):219-227
Clinical examination, bodily condition score (BCS), heart girth (HG), body length (BL), wither height (WH), and scrotal circumference (SC) were assessed on 486 mature Ethiopian Menz rams, on small farms, in local markets, and at the main abattoir in Addis Ababa from December 1994 to April 1995. Almost 27% of the rams were found to be unfit for breeding. Poor general condition, mainly in the form of respiratory disorders, was seen in 1.2% of the rams. Balanoposthitis, epididymitis and orchitis were the most common pathological conditions, affecting the external reproductive organs in 14.6%, 4.5% and 4.1% of the rams, respectively. Testicular calcification, cysts and testicular haemorrhagic lesions were detected in 4, 6 and 8, respectively, of the 60 rams examined at necropsy. The BCS, HG, BL and WH averaged 2.1±0.5, 67.7±5.0 cm, 60.1±4.5 cm and 60.1±4.3 cm, respectively. The mean SC was 25.5±3.9 cm and did not vary significantly with age (p>0.05). Among the linear body measurements, the highest correlation was between BL and WH (r = 0.66). SC was found to be most closely correlated to HG (r = 0.46). More investigations into the relationship between the present findings and actual fertility, and on their practical application in the selection of rams for breeding is recommended. 相似文献
5.
J. Jović T. Cvrković M. Mitrović S. Krnjajić Margaret G. Redinbaugh R. C. Pratt R. E. Gingery S. A. Hogenhout I. Toševski 《European journal of plant pathology / European Foundation for Plant Pathology》2007,118(1):85-89
Maize redness (MR), a disease causing midrib, leaf and stalk reddening and abnormal ear development in maize, has been reported
from Serbia, Romania and Bulgaria for 50 years. Recent epiphytotics reduced yields by 40%–90% in southern Banat, Serbia. MR
was recently associated with the presence of the stolbur phytoplasma, although the epidemiology of the disease remained unknown.
Diseased fields in southern Banat were surveyed for potential vectors of the phytoplasma during 2005 and 2006, and high populations
of Reptalus panzeri were found. In affected fields, 20% of the R. panzeri individuals and 85% of symptomatic maize plants carried the stolbur phytoplasma. When stolbur phytoplasma-infected R. panzeri were introduced into insect-free mesh cages containing healthy maize plants, midrib and leaf reddening developed on 48% of
plants and stolbur phytoplasma was detected in 90% of the symptomatic plants. No symptoms or phytoplasma-positive plants were
found in cages without insects. These data indicate that MR symptoms are associated with the stolbur phytoplasma. Reptalus panzeri is both abundant in affected fields and can transmit the stolbur phytoplasma, indicating the insect is likely to be a major
vector of MR. 相似文献
6.
Steve Tobak 《中国禽业导刊》2012,(17):30-30
每天,我们的收件箱和垃圾箱中充满了许诺重大效果的电子邮件,诸如“提高搜索引擎中的排名”以及“揭秘你的秘密销售力量”,更不必说那些“想要建立联系”或希望“只占用你15分钟”的名流了。而这只是上周收到的一小部分! 相似文献
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Kang-Seuk Choi Soo-Jeong Kye Ji-Ye Kim Thanh Long To Dang Tho Nguyen Youn-Jeong Lee Jun-Gu Choi Hyun-Mi Kang Kwang-Il Kim Byung-Min Song Hee-Soo Lee 《Tropical animal health and production》2014,46(1):271-277
Newcastle disease virus (NDV) causes significant economic losses to the poultry industry in Southeast Asia. In the present study, 12 field isolates of NDV were recovered from dead village chickens in Vietnam between 2007 and 2012, and were characterized. All the field isolates were classified as velogenic. Based on the sequence analysis of the F variable region, two distinct genetic groups (Vietnam genetic groups G1 and G2) were recognized. Phylogenetic analysis revealed that all the 12 field isolates fell into the class II genotype VII cluster. Ten of the field isolates, classified as Vietnam genetic group G1, were closely related to VIIh viruses that had been isolated from Indonesia, Malaysia, and Cambodia since the mid-2000s, while the other two field isolates, of Vietnam genetic group G2, clustered with VIId viruses, which were predominantly circulating in China and Far East Asia. Our results indicate that genotype VII viruses, especially VIIh viruses, are predominantly responsible for the recent epizootic of the disease in Vietnam. 相似文献
9.
一中国鸡蛋的市场占有量和发展方向
亚洲是全球最大的蛋品市场,全球养殖蛋鸡70亿只,中国蛋鸡数量13亿只,占全球蛋鸡养殖总量的18.5%,中国的鸡蛋产量占全球37.2%。可见中国是全球最重要的蛋品市场。中国大部分蛋鸡采用笼养的模式,美国93%的蛋鸡都采用笼养。从蛋品的消费量来看,中国位列世界第四,2011年人均消费鸡蛋295个(见表1)。 相似文献
10.
鸡蛋生产和蛋品加工是全球化的技术,其相关知识具有通用性。当养殖场所有生产要素都达到平衡时,家禽生产必然收获成功,包括品种、营养(饲料和水)、保健、禽舍、设备和饲养员等。饲料成本占据禽类肉蛋生产成本的60%-80%。虽然设备投资仅占2%-3%,但对饲料成本的节约却起到决定性的作用。控制成本要跟踪记录盈利水平,主要参数有饲料、用水量、温度、能耗等相关费用。 相似文献