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Vliv počtu návštěv dojnic v systému robotizovaného dojení na parametry mléčné užitkovosti
Mácha, Josef
The aim of the thesis was to clarify the influence of the number of visits of dairy cows in the robotic milking systems on milk yield parameters. An annual observation was carried out for this purpose (November 2017 to October 2018). A total of 729 dairy cows (cases) were evaluated. Among the parameters of milk yield were mainly daily milk yield (kg of milk), number of lactation, lactation phase (days in milk). Furthermore, the influence of temperature in the stable (° C) on the frequency of dairy cows' visits in the robotized milking system was evaluated. There was a highly statisticaly significant effect of the number of successful dairy cow visits in milking robot on the lactation phase, daily milk yieldand fat and protein content of milk (p <0.01). It was found, that with the increasing frequency of dairy cow visits during the day (n = 1 to n = 5), the average daily milk yield of these cows increases (from 18.3 to 48.4 kg of milk), while the fat content and protein decreased (from 4.53 to 3.84%, from 3.59 to 3.40% respectively). Furthermore, it was found that dairy cows with a lower lactation phase had a higher frequency of visits (from 189 days to 25.8 days). Further, a certain trend was observed where higher frequency of visits was found in older cows and lower frequency of visits in young cows (p> 0.05). Furthermore, it was found that the air temperature in the stable did not affect both the overall visit rate of the milking robot and the number of successful or unsuccessful visits (p> 0.05).
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Influence of robotic milking on milk production and quality
Houšková, Veronika ; Toušová, Renata (advisor) ; Jan, Jan (referee)
The object of this thesis was to assess the influence of robotic milking machines on the production and quality of milk in a herdof Czech Mottled Simmental cattle at a family farm Suchý during the period from January 2014 to December 2015.
The hypothesis: Robotic milking worsensre productive performance of cows and aggravates diseases of the limbs.
When evaluating the milk yield and reproductive performance of dairy cows in individual years, the data necesery was obtained from the control documentation of processed during regular yield assessments, carried out by Natural spol. s.r.o and the data selected from Analysis of a Herd Registered in a Herd-book of Czech Mottled Simmental Cattle, drawn up by the Czech-Moravian Breeders Association a.s. The statistical evaluation was processed and analysed by using Microsoft Office Excel and a statistical programme SAS 9.3 (SAS/STAT 9.3, 2011).
In respekt of the influence of order of lactation, it was found that some indicator shave a strong influence. As fortheherd A as well as herd B, a positive correlation between the sequence of lactation and milk production in kg (r= 0,123 herd A, r= 0,289 herd B; at a significance level of p<0.001). In herd A the milk production was higher than in the second and subsequent lactations by 1,165 kg compared with the first lactation (6,835kg). In a herd milked by a robot the production of milk was significantly higher than in the second lactation, and that by 2,221kg (7,285kg). Another positive correlation was found between thes equence of lactation and the number of somatic cells (r= 0.556 herd A, and r= 0,669 herd B and on the level of signifikance of p<0,001). In the originál herd quantities of somatic cells were measure dagainst the second and higher lactation, and that 388 x 1000/ ml. The same result has beenals of fortheherd B with a milking robot. The higher number of somatic cells was retraced in the second and higher lactation (282 x 1000/ ml); that means a lower value by 138 x 1000/ ml in comparison to the first lactation. When viewing the influence of the order of lactation on qualitative indicators, negative correlation wasestablished only in respekt of fat and lactose content.
After the evaluation of influence of the number of lactation days, a positive influence was found on the production of milk in kg (r= 0,923 herd A, and r= 0,885 herd B at a signifikance level of p<0.001). In both herdst hehighest performance wase stablishe dat the peak of lactation (24,6 kg forherd A and 27,19, kg forherd B). It was alsonoted that thereis a positive effect of lactation days on the protein content in milk (r= 0,253 forherd A and r= 0,100 forherd B on a level of signifikance of p<0.001). The highest percentage of protein was present in the originál herd A (3,385%) as well as in the robotisedherd B (3,365%) in the first lactationphase 1- 40 days. Contrariwise, number of lactation days has a negative effect on the kontent of fat, lactose and somatic cells in the milk.
In this thesis reproductive indicators were also evaluated. In robotised herd the repre found better values in the interim period, service period and during gestation period of cows after 1st insemination. In contrast with stalls with tandem milking, better results of conceiving of heifers after 1st insemination were achieved as well as conceiving of heifer after all inseminations, the insemination index and the percentage of conceptions of cows after all inseminations.
The above results indicate that the hypothesis cannot be fully confirmed or refuted. That part of the hypothesis, which assumes that robotic milking worsens the health condition of the limbscan be confirmed. But the second part of the hypothesis, deterioration of reproductive performance cannot be confirmed. For most of the reproductive performance indicators of there was signifiant improvement in milking using the robot.
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