Browsing by Subject "automaattilypsy"

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  • Aho, Varpu (Helsingin yliopisto, 2022)
    Mastitis is economically the most important disease and the second most important welfare issue after lameness in dairy production worldwide. Mastitis diagnosis consists of recognizing the causative pathogen and simultaneous changes in milk parameters, such as somatic cell count. Currently, 27 % of Finnish farms use automatic milking system (AMS) and more than 50 % of all milk is harvested by a milking robot. Large amounts of data are available from AMS, and they can be used to recognize and control mastitis on farms. The aim of this work was to study how different AMS data patterns describe mammary gland infection, and how they can be used in mastitis diagnosis. The most conventional parameter for diagnosing mastitis is somatic cell count (SCC) which describes the number of somatic cells per milliliter of milk. During mastitis, SCC increases, but a significant day-to-day variation is characteristic. SCC is measured in official Dairy Herd Improvement (DHI) programs, and SCC is also counted by sensors in AMS. The most common in-line measured parameter at AMS is electrical conductivity (EC). EC is measured quarter-specifically which makes it good for comparison among different quarters but there are some uncertainties associated with EC. In addition, L-lactate dehydrogenase (LDH) is an enzyme that indicates infection in different tissues and is also detectable with a sensor in some AMS. It’s less mastitis-specific than SCC, but because it has less daily variation, combined with SCC it’s currently an interesting tool for recognizing mastitis in AMS. Descriptive study was conducted using AMS data from 24 cows over 7 months from a Canadian research herd. The data were fragmented and only a few mastitis cases were included. However, the results describe the characteristics of different AMS parameters. Results showed that LDH is high especially in 1st lactation cows until 35 days after calving. As expected, LDH of mastitic cows was substantially higher compared to cows that were healthy or had non-udder illness. Interestingly, the daily variation of LDH in individual cows appears to be greater than expected.
  • Tohni, Joonas (Helsingfors universitet, 2017)
    The objective of this study was to compare the efficiency and capacity of milking robot models manufactured by Lely. In this study, milking robot models Astronaut A2 and A3 were compared to the renewed model Astronaut A4. Renewed build and advanced technology of A4 model are expected to increase the efficiency and capacity compared to the previous models. Especially, the I-flow concept of cows entering and exiting to the milking parlor in renewed A4 model is faster than in the previous models. Due to this change the cows are supposed to visit the robot more frequently in case of the new model. Further, the increased number of the visits is expected to increase the milk yield of the cows. In this study, the data was collected with Lely’s benchmark function by the NHK farm counseling. Data was collected from six farms where milking robot was changed from A2 to A4 and from six farms where the change was from A3 to A4. From each farm two periods of 100 days were gathered during two months before and after the change of the milking robot. The effect of the robot change was analyzed from average values calculated from the period before and after the change. In detail, the compared variables were: milking per cow per day, refusals per cow per day, connection attempts, box time per visit, handling time, milking time, milk yield per milking, the milk flow rate, and free capacity. According to the results, the change of robot increased clearly the number of milking visits, refusals, and milk yield per cow. Number of milking visit rose by 11,9% and refusals by 58%. The number of refusals was probably effected by the large number of free capacity that did exist on some analyzed farms after the milking robot change. Cows daily milk yield grew by 3.9 kg according to the results. The analysis of the results was done by comparing the robot technology and the data collected by the robots and therefore. Barn conditions and cows feeding were not considered in results. According to the results of the study the average number of visits to the robot was higher in A4 model. Also, the shortened box time was found to increase milking visits per day in A4 model.
  • Toivonen, Marjo (Helsingfors universitet, 2016)
    The aim of this study was to investigate the effects of starch content of partial mixed ration (PMR) on locomotion activity and milk yield in automatic milking system. The study was a part of Työtehoseura´s and ProAgria´s project “Automaattilypsynavetan toiminnallisuus”. The study was conducted at the research farm of the University of Helsinki. The experimental animals were thirty-nine primi- and multiparous cows, on average 104 days in milk at the beginning of the experiment. Cows were milked with automatic milking system which had a free cow traffic. Cows got concentrate from the milking robot 4, 6 or 8 kg according their milk yield. The experiment lasted six weeks and consisted of three two weeks’ periods. The experimental diets were partial mixed ration rich in starch (T) on periods 1 and 3 and partial mixed ration rich in neutral detergent fiber (NDF) (K) on period 2. The change in starch content was made by replacing half of the cereals with concentrate rich NDF. The fermentation quality and digestibility of silage were good. The starch content of partial mixed rations was 166 (T), 87 (K) and 177 (T) g/kg DM. Dry matter intake and number of eating bouts were not affected by the starch concentration of partial mixed ration. There was curvilinear difference in NDF and starch intake as planned in the study design. The amount of milking visits and refusals decreased linearly during the experiment. The amount of fetched cows decreased slightly. There were a few less fetched cows with the PMR rich in NDF although the curvilinear effect was not significant. Milk yield decreased linearly during the experiment. The protein content of milk decreased slightly with PMR rich in NDF. The fat content of milk increased linearly during the experiment. There was no significant difference in energy corrected milk yield. On herd level there were no difference in locomotion activity and fetchings between partial mixed ration rich in starch or NDF. In individual level the PMR rich in NDF decreased fetching of two primiparous cows. The experimental partial mixed ration rich in starch did not decrease milking visits. In addition, partial mixed ration rich in starch had no effect on dry matter intake, eating visits or milk yield compared with partial mixed ration rich in NDF.