Plasma Cortisol Concentrations after CIDR Insertion in Beef Cows     

ST Long  NC Thinh  M Yusuf  T Nakao 《Reproduction in domestic animals》2011,46(1):181-184

The objective of this study was to show plasma cortisol concentration after treatment with controlled internal drug release (CIDR) in non‐suckling beef cows. On day 9 after oestrus, two cows were inserted with CIDR into the vagina for 24 h and the other two cows were treated as a control group. Four days later, the two control cows were treated with CIDR and the other two CIDR‐treated cows were used as controls. Cortisol concentrations were determined by ELISA in plasma samples collected before, during and after insertion of CIDR. There was a significant increase in plasma cortisol concentrations (p < 0.01) after insertion of CIDR. Mean (±SEM) plasma cortisol concentrations increased from 1.3 ± 0.4 to a peak of 8.8 ± 1.1 ng/ml at 5 h and then decreased to basal concentrations at 7 h after insertion of the device. In conclusion, the insertion of intra‐vaginal device causes an increase in plasma cortisol concentrations in beef cows, although the pathophysiological significance of the elevation of cortisol is not known.  相似文献   

Adrenocortical Response in Cows after Intramuscular Injection of Long‐Acting Adrenocorticotropic Hormone (Tetracosactide Acetate Zinc Suspension)     

NC Thinh  C Yoshida  ST Long  M Yusuf  T Nakao 《Reproduction in domestic animals》2011,46(2):296-300

The objectives of this study were first to show adrenocortical response to a long‐acting adrenocorticotropic hormone preparation (tetracosactide acetate zinc suspension) (ACTH‐Z) and its effect on adrenocortical function in beef cows ( Experiment 1 ) and second to apply the ACTH‐Z challenge in dairy cows based on cortisol concentrations in milk collected at routine milking ( Experiment 2 ). In Experiment 1 , four beef cows in luteal phase were challenged with ACTH‐Z, and plasma cortisol concentrations were determined for 48 h after the injection at 30‐min to 2‐h intervals. A rapid ACTH test was conducted 3 days before and 2 h after the completion of ACTH‐Z injection for 48 h to investigate the effect on adrenocortical function. Plasma cortisol concentrations increased significantly 30 min after ACTH‐Z injection (p < 0.001), and the high cortisol levels were maintained for approximately 10 h after the injection. In Experiment 2 , eight dairy cows were subjected to ACTH‐Z challenge 1–2 weeks and 4–5 weeks post‐partum. Blood and milk samples were taken at morning and afternoon milking. All the cows showed a significant increase in cortisol concentrations in plasma as well as in skim milk 8 h after ACTH‐Z injection 1–2 weeks and 4–5 weeks post‐partum (p < 0.001). There was a significant correlation between plasma and skim milk cortisol concentrations 8 h after ACTH‐Z challenge (r = 0.74, p < 0.001). The results obtained in this study suggest that elevated levels of plasma cortisol are maintained for approximately 10 h after ACTH‐Z treatment without adverse effect on adrenocortical function and a long‐acting ACTH‐Z challenge based on cortisol concentrations in milk, which were collected at the morning and the afternoon milking, can be a useful tool to monitor adrenocortical function in cows.  相似文献   

Variance components,correlation and path analyses in cowpea (Vigna unguiculata L., Walp)     

Aliyu  Olawale Mashood  Tiamiyu  Adeyemi Odunola  Usman  Muinat  Abdulkareem  Yusuf Folorunsho 《Journal of Crop Science and Biotechnology》2022,25(2):173-182

Journal of Crop Science and Biotechnology - Cowpea as a low-input crop has a potential to significantly ameliorate poor nutrition and food insecurity in sub-Sahara Africa if problem of poor seed...  相似文献   

Screening for new sources of resistance to Clavibacter michiganensis subsp. michiganensis (Cmm) in tomato     

Yusuf Sen  Zhu Feng  Henri Vandenbroucke  Jan van der Wolf  Richard G. F. Visser  A. W. van Heusden 《Euphytica》2013,190(2):309-317

Bacterial canker of tomato, caused by Clavibacter michiganensis subsp. michiganensis (Cmm), is considered the most serious bacterial threat, resulting in high damages in production areas. Worldwide, Cmm is subjected to quarantine regulations.There is no cultivar in market containing Cmm resistance genes. This project aimed to screen tomatoes or wild relatives of tomato for resistance to Cmm, to be used for starting breeding programs. We have screened 24 different wild accessions of tomato and found several new tolerant sources: Solanum pimpinellifolium GI.1554, S. parviflorum LA735 and S. parviflorum LA2072. We also confirmed the tolerance which was reported previously in S. peruvianum LA2157, S. peruvianum PI127829, S. peruvianum LA385, S. habrochaites LA407 and S. lycopersicum cv. IRAT L3. No immunity was found. Also accessions showing a low disease score still contained high titers of bacteria as determined by a dilution plating method, using tow selective media. These results were confirmed with a TaqMan real time PCR assay, which was developed to determine and quantify Cmm in planta.  相似文献   

The effect of seaweed extracts,as a supplement or alternative culture medium,on the growth rate and biochemical composition of the microalga,Isochrysis galbana (Park 1949)     

Kiuomars Rohani‐Ghadikolaei  Wing‐Keong Ng  Eesa Abdulalian  Aghajari Naser  Aftabsavar Yusuf 《Aquaculture Research》2012,43(10):1487-1498

Aqueous extracts of green [Ulva lactuca Linnaeus and Enteromorpha intestinalis (Linnaeus) Nees] and red [Gracilaria corticata (J. Agardh) J. Agardh] seaweeds from the Persian Gulf of Iran were examined for their potential usefulness as components of microalga Isochrysis galbana culture medium against conventional f/2 medium. Isochrysis galbana was successfully cultured using the tested seaweed extracts (SWE) and exhibited higher or similar cell density and biomass when SWE were used as a supplement or an alternative medium respectively. When the SWE were used as an alternative medium, microalgal protein, lipid and ash content were similar but carbohydrate increased compared with control. Total saturated fatty acids decreased with a corresponding increase in total mono‐ and polyunsaturated fatty acids following supplementation of f/2 medium with SWE. Eicosapentaenoic acid (EPA) was not affected by SWE treatments but docosahexaenoic acid (DHA) tended to decrease, except for I. galbana cultured with U. lactuca extract. With the exception of potassium, SWE did not significantly impact the mineral content of cultured I. galbana. The study points to the potential usefulness of specific SWE in the production of microalgae as a food source in aquaculture.  相似文献   

Maize-rice cropping systems in Bangladesh： Status and research needs     

M. Yusuf Ali  ;S. R. Waddington  ;J. Timsina  ;D. Hodson  ;J. Dixon 《农业科学与技术》2009,(6):35-53

Maize-rice cropping systems are expanding in Bangladesh. Hybrid maize has increasing demand and value, particularly for poultry feed, while rice remains the traditional dominant starch staple food. Bangladesh maize yields （with average farm yields around 5.7 t·ha^-1） are among the highest found in Asia. Cool winter （Rabi） season maize followed by T. Aman （monsoon） rice is the major cropping system; however it is now becoming diversified with many other crops including potato. Financially, hybrid maize is far more profitable than boro （irrigated） rice, wheat, or most other competing winter season Rabi crops. Although maize is relatively problem-free in Bangladesh, some constraints are intensifying with increased concern over input supply and soil-related environmental sustainability. An array of new technologies for sustainable intensive maize production systems is emerging in Bangladesh and some are being promoted and adopted. Continued sustainability of hybrid maize production in Bangladesh depends on optimization of planting time, quality seed of appropriate hybrids, balanced use of nutrient inputs along with soil fertility conservation and other management, for which further research would be high priority.  相似文献   

The oak gallwasp <Emphasis Type="Italic">Aphelonyx persica:</Emphasis> a new record from Turkey,with some new host records     

Yusuf Katılmış  Suat Kıyak 《Phytoparasitica》2009,37(1):95-97

A new record is reported of the oak gallwasp Aphelonyx persica on oaks (Quercus cerris, Q. ithaburensis, Q. trojana) in the Inland Aegean Region of Turkey. This species is recorded for the first time on Q. cerris and Q. trojana. Details are given of the geographical distribution, hosts and phenology.  相似文献   

棉花连作对渭干河-库车河三角洲绿洲土壤理化性质的影响   总被引：1，自引：0，他引：1  

玉苏甫·买买提  满苏尔·沙比提  阿曼古丽·艾孜子 《干旱地区农业研究》2014,32(4):117-121

以渭干河-库车河三角洲绿洲连作5、10、15、20 a和25 a的棉田土壤为研究对象,对棉田土壤的理化性质和酶活性进行分析。结果表明： 随着棉花连作年限的增长棉田土壤容重增大、孔隙度下降,粗砂和细沙含量增加,粘粒含 量下降,其变化连作15 a极为明显; 随着连作年限的增长盐分含量和pH值逐渐降低,有机质和碱解氮含量大幅度升高,速效磷比较稳定或略有减小,而钾的含量显著下降,致使氮、磷、钾比例失调,其增减变化连作15 a极为显著; 随着连作年限的增长脲酶、过氧化氢酶和转化酶的活性呈现先升后降的趋势,连作15 a都达到最高值,蛋白酶和磷酸酶活性也呈现先升后降的趋势,但其活性连作20 a达到最高值。 由研究结果可以得出研究区棉花连作年限不宜超过15 a,棉花连作年限超过15 a时,会导致土壤容重增大、孔隙度下降,土体紧实板结,结构性差,土壤养分含量失衡,酶活性降低,土壤质量下降等连作障碍,使得棉花产出和效益受到影响。  相似文献   

Influence of processing cassava peels on the hydrogen cyanide concentration, nutritive value and performance of growing rabbits     

Olafadehan OA  Olafadehan OO  Obun CO  Yusuf AM  Adewumi MK  Omotugba SK  Daniel NE 《Tropical animal health and production》2012,44(2):285-291

Forty-eight rabbits used to investigate the response of growing rabbits to diets containing differently processed cassava peel meals were divided into four groups balanced for sex and weight. These groups were then assigned at random to the experimental treatments. Four diets were formulated such that the diets contained 200 g/kg of the experimental feedstuffs, sun-dried cassava peel meal (S), ensiled cassava peel meal (E) and retted cassava peel meal (R), and the control did not contain any cassava peels. Hydrogen cyanide (HCN) concentration in the processed cassava peel meal was lower relative to the unprocessed meal. It was, however, lowest in R and highest in E. With the exception of S, fibre fractions were lower in the processed meal compared to the unprocessed meal. The E depressed (p < 0.05) feed and digestible nutrient intakes, weight gain, nutrient digestibility, digestible protein (DP), digestible energy (DE) and DP/DE ratio but increased protein intake to gain and feed to gain ratios compared to other diets. Intake of HCN decreased (p < 0.05) successively in this order: R, S and E. The results indicate that retting and sun-drying are more effective in cassava peel detoxification than ensiling, and dietary HCN concentration and intake of 56 and 4 mg/kg BW, respectively, were not toxic under the conditions of the experiment.  相似文献   

Relationship between streamflow and nutrient and sediment losses from an oak-beech forest watershed during an 18-year long monitoring study in Turkey     

Ferhat Gökbulak  Yusuf Serengil  Süleyman Özhan  Necdet Özyuvacı  A. Nihat Balcı 《European Journal of Forest Research》2008,127(3):203-212

The objectives of this study were to quantify the amount of the stream discharge, nutrient fluxes, suspended sediment loss, and to define the relationship between streamflow and these parameters in a forest-covered watershed. The study was carried out in an experimental watershed, which has been monitored since 1979 in the Belgrad forest in Istanbul. Significant linear regressions were obtained between streamflow and discharge of selected water quality parameters. Mean monthly losses were 10.01 kg/ha for HCO₃ ⁻, 5.92 kg/ha for CI⁻, 0.07 kg/ha for total N, 1.29 kg/ha for Mg²⁺, 3.59 kg/ha for Ca²⁺, 2.59 kg/ha for Na⁺, 1.82 kg/ha for K⁺, 0.0113 kg/ha for P-PO₄ ³⁻, and 35.82 kg/ha for suspended sediments. Among the monitored water quality parameters, HCO₃ ⁻, CI⁻, and Ca²⁺ had greater losses than the rest of the chemical parameters studied in the watershed. Net gains (influx exceeded outflux) calculated for total N, Mg²⁺, K⁺, and P-PO₄ ³⁻ in the annual basis can be considered as an addition to the ecosystem’s organic nutrient pool. In contrast, net losses occurred for HCO₃ ⁻, CI⁻, Ca²⁺, and Na⁺.  相似文献