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Megumi ITOH Yoshie SAKURAI Yasuhiro NAKAJIMA Satoshi KAWAMOTO 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(12):1655-1657
The association between blood calcium levels and electrocardiographic variables was
compared in 137 normal parturient and 36 peripartum recumbent Holstein cows to determine
whether hypocalcemia in peripartum dairy cows can be rapidly diagnosed using
electrocardiograph. Inverse of STc (ST peak interval/SS interval0.5) and blood
ionized calcium or serum calcium concentrations were strongly correlated, and both
correlation coefficients were 0.81 (P<0.001). The 95% prediction
interval indicated that cows with STc >0.385 ± 0.001 sec are very likely to be
hypocalcemic (blood ionized or serum calcium concentrations of <0.9
mmol/l or <7.5 mg/dl, respectively). These findings
indicate that hypocalcemia in parturient cows can be non-invasively estimated using the
STc. 相似文献
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Shogo HIGAKI Hongyu DARHAN Chie SUZUKI Tomoko SUDA Reina SAKURAI Koji YOSHIOKA 《The Journal of reproduction and development》2021,67(1):67
We aimed to determine the effectiveness of estrus detection based on continuous measurements of the ventral tail base surface temperature (ST) with supervised machine learning in cattle. ST data were obtained through 51 estrus cycles on 11 female cattle (six Holsteins and five Japanese Blacks) using the tail-attached sensor. Three estrus detection models were constructed with the training data (n = 17) using machine learning techniques (random forest, artificial neural network, and support vector machine) based on 13 features extracted from sensing data (indicative of estrus-associated ST changes). Estrus detection abilities of the three models on test data (n = 34) were not statistically different among models in terms of sensitivity and precision (range 50.0% to 58.8% and 60.6% to 73.1%, respectively). The relatively poor performance of the models might indicate the difficulty of separating estrus-associated ST changes from estrus-independent fluctuations in ST. 相似文献
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Venecio U. ULTRA Jr Atsushi NAKAYAMA Sota TANAKA Yumei KANG Katsutoshi SAKURAI K&#;z&#; IWASAKI 《Soil Science and Plant Nutrition》2009,55(1):160-169
A pot culture experiment was conducted to investigate the effects of amorphous iron-(hydr)oxide (Am-FeOH) amendments on arsenic (As) availability and its uptake by rice ( Oryza sativa L. cv. BR28) irrigated with As-contaminated water. A rhizobag system was established using 3.5 L plastic pots, each containing one central compartment for plant growth, a middle compartment and an outside compartment. Three levels of laboratory-synthesized Am-FeOH (0, 0.1 and 0.5% w/w) were used to amend samples of the As-free sandy loam paddy soil placed into each compartment of the rhizobag system. The soils were submerged with a solution containing 5 mg L−1 As(V). Two-week-old rice seedlings were planted in the central compartments and cultured for 9 weeks under greenhouse conditions. The addition of 0.1% Am-FeOH to the soil irrigated with As-contaminated water improved plant growth, reduced the As concentration in the plants and enhanced Fe-plaque formation on the root surfaces. Analysis of soil solution samples collected during the experiment revealed higher pH levels and lower redox potentials in the soils amended with Am-FeOH at the onset of soil submergence, but later the soil solution collected from the 0.1% Am-FeOH treatment was slightly acidic and more oxidized than the solution from the 0% treatment. This indicated active functioning of the roots in the soil treated with 0.1% Am-FeOH. The concentrations of As(III) in the soil solution collected from the central compartment were significantly reduced by the Am-FeOH amendments, whereas in the soil treated with 0% Fe, As(III) accumulated in the rhizosphere, particularly during the late-cultivation period. The improvement in plant growth and reduction in As uptake by plants growing in the Am-FeOH treated soil could be attributed to the reduction of available As in the soil solution, mainly as a result of the binding of As to the Fe-plaque on the root surfaces. 相似文献
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鱿鱼类是摄食极为凶猛的海洋动物。实验条件下对太平洋褶柔鱼(Todarodes pacificus)的摄食行为进行观察与描述,实验分3种不同的太平洋褶柔鱼群体大小(3尾,7~12尾,以及44尾)在循环水水槽中进行,实验用太平洋褶柔鱼平均胴长为20 cm。用高感录像机对太平洋褶柔鱼摄食过程进行记录,同时观察太平洋褶柔鱼对饵料鱼的攻击行为。观察认为,发现、进攻目标饵料鱼阶段的角度范围分别为广分布和窄分布,大多数对饵料鱼的进攻阶段开始于二者相对距离为1到6个胴长间。太平洋褶柔鱼在攻击阶段时其体色表现出暗色模式。在个体多的太平洋褶柔鱼群体中,太平洋褶柔鱼追逐较大的饵料鱼,且有观察到几尾太平洋褶柔鱼共同分食一尾饵料鱼的现象。研究认为,太平洋褶柔鱼摄食行为与自身个体大小、群体大小以及饵料鱼大小等密切相关。 相似文献
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