Measurement of temperature and humidity inside a dairy plant pdf

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measurement of temperature and humidity inside a dairy plant pdf

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Skip to content. The fall and spring are times when humidity related diseases usually peak in greenhouses. Sunny days increase the transpiration of moisture from leaf surfaces and evaporation from soil. The warm air holds the moisture in the vapor form. At night as the air cools to the dew point, condensation occurs and water droplets are formed on cooler surfaces such as the leaves and glazing.

Production during weeks with relatively high THI values 70 or over was higher than production in weeks with lower temperature-humidity stress. In autumn and winter when THI values were low, the quantity and quality of pasture available was inadequate to sustain high levels of milk production. Short-term weekly responses of milk output to changes in temperature-humidity conditions above THI values of 70 were not consistent, either in terms of the direction or magnitude of production change. THI values may not have been high enough to adversely affect week-to-week production from predominantly Jersey herds, although some depression in lactation yields may have occurred. The reduction in digestibility and palatability of grasses during late summer appeared to be of greater importance in influencing production patterns than the direct effects of stressful temperature-humidity conditions on cows. This is a preview of subscription content, access via your institution. Rent this article via DeepDyve.

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The water activity a w of a food is the ratio between the vapor pressure of the food itself, when in a completely undisturbed balance with the surrounding air media, and the vapor pressure of distilled water under identical conditions. A water activity of 0. The water activity increases with temperature. The moisture condition of a product can be measured as the equilibrium relative humidity ERH expressed in percentage or as the water activity expressed as a decimal. Most foods have a water activity above 0. The amount of available moisture can be reduced to a point which will inhibit the growth of the organisms. If the water activity of food is controlled to 0.

The severity of heat stress issues on dairy cows will increase as global warming progresses. Fortunately, major advances in environmental management, including fans, misters, sprinklers, and cooled waterbeds, can attenuate the effects of thermal stress on cow health, production, and reproduction. These cooling systems were, however, tested in subtropical areas and their efficiency in northern regions is uncertain. This article assesses the potential of existing technologies to cool cows in humid continental climates through calculation of heat stress indices. Heat stress negatively affects the health and performance of dairy cows, resulting in considerable economic losses for the industry.

For estimation of the effect of THI on daily production of dairy cows fixed-effect Average temperature-humidity indexes during the autumn (C) and the winter (D) season ly farm, the HPA control assistant (A) or the farmer Microclimate conditions in the stables during measuring months in.

The Dairy Industry: Process, Monitoring, Standards, and Quality

The aim of this work was the presentation of an alternative method of determination of the total dry mass content in processed cheese. For the test purposes both reference method of determination of dry mass in processed cheese and moisture analyzer method were used. The tests were carried out for three different kinds of processed cheese. The moisture analyzer test required method validation, with regard to drying temperature range and mass of the analyzed sample. For Hochland cream processed cheese sample, the total dry mass content, obtained using the reference method, was

Heat stress exerts a substantial effect on dairy production. The temperature and humidity index THI is widely used to assess heat stress in dairy operations. Herein, we review the effects of high temperature and humidity on body temperature, feed intake, milk production, follicle development, estrous behavior, and pregnancy in dairy cows. Analyses of the effects of THI on dairy production have shown that body temperature is an important physiological parameter in the evaluation of the health state of dairy cows.


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