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Cow longevity in herds of different milk production levels and herd size. The effect of herd production level and herd size on cow longevity was studied using the SYMLEK system data on 12045 Polish Holstein-Friesian cows (Black-and-White variety) from 1371 herds. The cows, which belonged to the active population in Pomerania and Kujawy, first calved in 2008 and were used or disposed from the herds...
The authors present the apparent improvement of quality of La2CuO4 (LCO) thin films with the introduction of an amorphous layer (AL) of LCO. The samples were grown on LaSrAlO4 substrates by pulsed laser deposition. X-ray diffraction (XRD) measurements demonstrate that the introduction of the AL of LCO significantly improves the structural quality of LCO thin films. The linewidth of XRD peaks is significantly...
In the perovskite-type Ca1−xCexMnO3 (CCMO), one can control the transport and magnetic properties through varying Ce content. In the case of thin films, the properties can also be controlled by epitaxial strain from the substrate through changing it such as YAlO3 (YAO), NdAlO3 (NAO), and LaSrAlO4 (LSAO). However, one cannot measure the magnetization of thin films on NAO substrates by conventional...
We have investigated the current-voltage (I-V) and current-time (I-t) characteristics of Pt/BiFeO3/SrRuO3 structures fabricated on SrTiO3 substrates. The devices exhibit resistive switching effect under the application of a single and multiple voltage loops. The I-V curves are simulated using a Schottky-like conduction model with voltage-varying parameters. The model includes series resistance correction...
The present review attempts to sum up the knowledge concerning the effect of dry period length on the milk yield of cows in the next lactation. The dry period is characterized by radical changes in the anatomy, histology and physiology of the mammary gland, which undergoes the stages of active involution, steady state, and colostrum production. The 60-day dry period, once considered optimal, was adopted...
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