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Author: Rose-Meierhöfer, Sandra × End date: 2019 × Start date: 2019 × Type: Text × WGL Institute: ATB ×

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Now showing 1 - 6 of 6
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    Viertelindividuelle Vakuumapplikation für moderne Melksysteme
    (Darmstadt : KTBL, 2012) Ströbel, Ulrich; Rose-Meierhöfer, Sandra; Hoffmann, Gundula; Ammon, Christian; Amon, Thomas; Brunsch, Reiner
    Durch den Einsatz von viertelindividueller Melktechnik können die Bedingungen für Melkpersonal und Kühe erheblich verbessert werden. Die getrennte Schlauchführung für die Milch aus den vier Eutervierteln bietet deutliche Vorteile für die technische Weiterentwicklung dieser Melksysteme. Im Folgenden wird der Prototyp eines viertelindividuellen Melksystems mit Vakuumregelungseinheit vorgestellt, der eine milchflussabhängige, präzise Vakuumanpassung für jedes Euterviertel, verbunden mit einer hohen Rate von Sollwert-Istwert-Abgleichen durch die Regelungseinheit, ermöglicht.
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    Comparison of the effects of quarter-individual and conventional milking systems on milkability traits
    (München : European Geopyhsical Union, 2011) Müller, Anika B.; Rose-Meierhöfer, Sandra; Ammon, Christian; Brunsch, Reiner
    This study was carried out to investigate a new quarter-individual milking system called MultiLactor® (Siliconform GmbH, Türkheim, Germany). The MultiLactor enables milking on quarter level basis with low vacuum (37 kPa), sequential pulsation and periodic air inlet. Within the same dairy farm, the influence of this quarter-individual milking system (MULTI) on milkability traits was compared with a conventional milking system (CON). CON was equipped with a conventional milking cluster and used alternating pulsation. Vacuum level was adjusted to 40 kPa. For the study, 84 Holstein Friesian cows were randomly selected and uniformly divided into two herds. During the 30-week survey, the milk flow curves were recorded every other week by using a LactoCorder (WMB, Balgach, Switzerland). Significant differences (P<0.05) between both milking systems were found for all milk flow traits, except for milk yield and decline phase. Concerning the incline (tAN) and plateau (tPL) phase, large differences existed between MULTI and CON. The estimated value of tAN calculated for MULTI (29.4 s) took only half of the time when calculated for CON (56.4 s). The estimated value of tPL at CON was reduced by 1.43 min (35 %) compared to MULTI. Milking process at MULTI (8.49 min) took longer time than for CON (7.43 min). From the study, it was concluded that the effect of shorter tAN in the quarter-individual milked cows may be related to additional prestimulation by an actuator. In contrast, the longer milking time in MULTI is possibly caused by lower vacuum level and periodic air inlet.
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    Drinking and cleaning water use in a dairy cow barn
    (Basel : MDPI, 2016) Krauß, Michael; Drastig, Katrin; Prochnow, Annette; Rose-Meierhöfer, Sandra; Kraatz, Simone
    Water is used in dairy farming for producing feed, watering the animals, and cleaning and disinfecting barns and equipment. The objective of this study was to investigate the drinking and cleaning water use in a dairy cow barn. The water use was measured on a well-managed commercial dairy farm in North-East Germany. Thirty-eight water meters were installed in a barn with 176 cows and two milking systems (an automatic milking system and a herringbone parlour). Their counts were logged hourly over 806 days. On average, the cows in the automatic milking system used 91.1 (SD 14.3) L drinking water per cow per day, while those in the herringbone parlour used 54.4 (SD 5.3) L per cow per day. The cows drink most of the water during the hours of (natural and artificial) light in the barn. Previously published regression functions of drinking water intake of the cows were reviewed and a new regression function based on the ambient temperature and the milk yield was developed (drinking water intake (L per cow per day) = −27.937 + 0.49 × mean temperature + 3.15 × milk yield (R2 = 0.67)). The cleaning water demand had a mean of 28.6 (SD 14.8) L per cow per day in the automatic milking system, and a mean of 33.8 (SD 14.1) L per cow per day in the herringbone parlour. These findings show that the total technical water use in the barn makes only a minor contribution to water use in dairy farming compared with the water use for feed production.
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    The usability of a pressure-indicating film to measure the teat load caused by a collapsing liner
    (Basel : MDPI, 2016) Demba, Susanne; Sabrina, Sabrina; Ammon, Christian; Rose-Meierhöfer, Sandra
    Prevention of damage to the teat and mastitis requires determination of the teat load caused by a collapsing liner. The aim of this study was to test a pressure-indicating film designed to measure the pressure between a collapsing liner and artificial teats. The Ultra Super Low and the Extreme Low pressure-indicating films were tested on two types of artificial teat. The experiments were performed with a conventional milking cluster equipped with round silicone liners. For each teat and film type, 30 repetitions were performed. Each repetition was performed with a new piece of film. Kruskal-Wallis tests were performed to detect differences between the pressure values for the different teats. The area of regions where pressure-indication color developed was calculated to determine the most suitable film type. Both film types measured the pressure applied to both artificial teats by the teat cup liner. Thus, the pressure-indicating films can be used to measure the pressure between a collapsing liner and an artificial teat. Based on the results of the present investigation, a pressure-indicating film with the measurement ranges of both film types combined would be an optimal tool to measure the overall pressure between an artificial teat and a collapsing liner.
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    Development of a control system for the teat-end vacuum in individual quarter milking systems
    (Basel : MDPI, 2013) Ströbel, Ulrich; Rose-Meierhöfer, Sandra; Öz, Hülya; Brunsch, Reiner
    Progress in sensor technique and electronics has led to a decrease in the costs of electronic and sensor components. In modern dairy farms, having udders in good condition, a lower frequency of udder disease and an extended service life of dairy cows will help ensure competitiveness. The objective of this study was to develop a teat-end vacuum control system with individual quarter actor reaction. Based on a review of the literature, this system is assumed to protect the teat tissue. It reduces the mean teat-end vacuum in the maximum vacuum phase (b) to a level of 20 kPa at a flow rate of 0.25 L/min per quarter. At flow rates higher than 1.50 L/min per quarter, the teat-end vacuum can be controlled to a level of 30 kPa, because in this case it is desirable to have a higher vacuum for the transportation of the milk to the receiver. With this system it is possible for the first time to supply the teat end with low vacuum at low flow rates and with higher vacuum at increasing flow rates in a continuous process with a three second reaction-rate on individual quarter level. This system is completely automated.
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