Publications by authors named "Hisanori Yamazaki"

Improving productivity is an urgent issue in the swine industry if it is to compete internationally. However, lack of data about recent productivity transition obstructs stakeholder planning. This study investigated the yearly productivity trends among farrow-to-finish swine farms in Japan using annual productivity data from 2013-2018 obtained for 70 farms in Japan.

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Defined daily doses (DDD) have been established in human medicine to standardize the measurement of treatment in a population. In veterinary medicine, the European Medicine Agency published defined daily dose (DDDvet) values for antimicrobial agents used in food-producing animals in 2016. National defined doses (DDDjp) for antimicrobials used for pigs in Japan have recently been determined.

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Article Synopsis
  • In Japan, veterinary antimicrobials are primarily used in pig production, but detailed data on their usage is scarce.
  • The study analyzed data from 72 pig farms over three years (2015-2017) and found average antimicrobial use to be 304.8, 311.2, and 342.9 mg/kg PCU, with most (97%) administered orally.
  • Tetracyclines were the most commonly used, and usage was highest in the South Kanto region, showing an increasing trend in North Kanto, South Kanto, and Kyushu.
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The objective was to investigate porcine epidemic diarrhea (PED) outbreak that occurred in 2014 in Japan and its effects on herd-level productivity using a data recording system (PigINFO). The study herds were selected from farrow-to-finish herds (n=99) that entered in the PigINFO system between July 2013 and March 2015. From 1 April to 30 June 2014 (PED epidemic), any herds with clinical signs of PED and feces positive for porcine epidemic diarrhea virus (PEDV) on polymerase chain reaction analysis and/or immunohistochemical staining were defined as PED-positive (n=38).

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Pseudorabies virus (PRV) is endemic in some regions of Japan. We investigated the effects of PRV infection status on herd productivity. Serum samples were obtained from 48 swine herds in Japan.

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