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In this study, the amount of nursing synchronisation was quantified, the dependence of the degree of synchronisation on the spatial distance between sows was examined, and the effect of nursing vocalisation playback on nursing frequency and nursing synchronisation was assessed in a large commercial ...
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Pig blastocysts aged 14, 15 and 18 days were divided into 15-cm segments representing tissue adjacent to the embryonic disc, an intermediate section and the tip region. Whenever total blastocyst length allowed, the intermediate segment was divided into proximal and distal portions for separate cultu...
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A prototype 915-MHz microwave unit was designed to rewarm hypothermic piglets. Initial tests indicate that it is possible to rewarm piglets successfully from deep stages of hypothermia using 915-MHz microwaves. Rewarming did not cause any significant physiological changes in blood variables, nor did...
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Before suckling, 14 newborn piglets, weighing <1.25 kg, were dried, weighed, and their rectal temperatures recorded. Rectal temperatures were then reduced to 25 degrees C, to induce hypothermia, by placing the piglets in a 10 degrees C cooling unit. A microwave (MW) generator was programmed to re...
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Chicks housed at 16 degrees C were exposed to microwave or infrared heat. Microwave power density was 26, 13 or 10 mW/cmsuperscript 2. Chicks voluntarily demanded between 28 and 63% as much heat (min heat/hr) from the microwave source as from the infrared source at all power densities. There was no ...
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Serum concentrations of cortisol were monitored in four sows 100 days pregnant during and after cannulation through an ear vein and thereafter for 11.5 days. During this period, the sows were exposed to the following environmental temperatures: 2 days at 18 degrees C and 3 days at 2, 18 and 32 degre...
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A study was conducted to establish whether auditory stimulation in the form of pre-taped maternal vocalizations would influence initial feeding behaviour in newly hatched poults. For the purposes of the study control birds (Group C) were raised under simulated commercial conditions. Other birds were...
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The survival rates of pigs subjected to different farrowing management protocols were compared. 60 litters of YorkxLandrace piglets were either unattended at farrowing or were dried, had the umbilical cord tied, had oral and nasal cavities suctioned to clear mucus, received oxygen and received bovin...
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On day 105 of gestation 12 pregnant sows were given isoflupredone injection, corticotropin infusion or saline infusion. Sow blood cortisol concentration increased (P<0.05) in response to corticotropin but not to isoflupredone. Blood glucose concentration remained constant in all groups. Body weig...
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The factors (farm type descriptions) obtained from a previous factor analysis study were analysed using regression with prevalence estimates of enzootic pneumonia on 69 pig farms. Farms were divided on enzootic pneumonia prevalence greater or less than 10%. Multiple logistic regression analysis of t...