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Mléčná užitkovost plemene Brown Swiss ve vybraném chovu
MACHÁČKOVÁ, Kamila
Milk yield control in cows is a crucial activity in cattle farming, providing valuable information for breeders and geneticists. The aim of the thesis was to evaluate the individual milk yield controls of the Brown Swiss breed in a selected breeding program. The number of cows monitored for yield control over two years remained approximately twenty head. The values of milk yield, milk fat, milk protein, lactose and somatic cells were monitored.
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Mléčná užitkovost kozy bílé krátkosrsté a hnědé krátkosrsté ve vybraném chovu
KRAMEŠOVÁ, Jaroslava
Goats have recently become popular for breeding. They are breeding mainly for meat and milk. The aim of this study was to evaluate the performance of goats in gene reserves in the Czech Republic. The average milk yield for years the 2020 to 2022 for a white shorthaired goat is 296,0 kg per standardized lactation and for brown shorthaired goats is 270,1 kg. The average fat content of milk for white shorthaired goats is 4,34 % and for brown shorthaired goats is 4,27 % in the monitored period. The protein content of a white shorthaired goat is 2,90 % and for brown shorthaired goat is similar (2,89 %). The last monitored substance was lactose. The average content lactose in milk for a white shorthaired goat is 4,29 % and for brown shorthaired goat is 4,24 %. Results show below the average milk yield but milk fat content was higher than average. This milk is better for example to make a cheese. The milk yield and the content of the individual components are genetically influenced. They can also be influenced by stress, nutrition, and other factors.
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Zhodnocení provozních a ekonomických faktorů ovlivňujících výkupní cenu mléka na konkrétní farmě na Ukrajině
Orlov, Bohdan
The bachelor's thesis discusses operational and economic factors that affect the purchase price of milk. We were interested in one particular farm in Ukraine. The price formation mechanisms could be different compared to the Czech Republic and, consequently, the European Union, which was interesting us. The monitored parameters mainly included: the amount of milk pro-duced, fat and protein content, takings depending on the quantity and quality of milk produced. We selected the subject (sample) by convenience sampling method. The company STOV im. Lesia Serdiuka, which is specified for the breeding of Holstein (Ukrainian black-and-white) and Ukraini-an red-and-white cattle, served as the object of the research. Data collection was carried out through telephone conversations and e-mail communication, the obtained data were subse-quently processed according to common mathematical and statistical methods. The results of the research indicate a strong direct-proportional connection between the purchase price of milk and the concentration of fat and protein, however, the total takings are affected more by the amount of milk produced than by the amount of components contained in it.
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Analýza parametrov mliečnej úžitkovosti u dojníc pred a po inštalácii ventilátorov v stajni
Kancír, Ján
The aim of the study is to analyse milk performance parameters in dairy cows before and after the installation of fans in the barn. For this purpose, observation was carried out in a particular farm. The observation was carried out during the period from 2016 to the end of 2022. The whole observation was divided into two periods namely the period before and the period after the installation of the ventilators. The milk performance parameters will mainly include milk yield (kg milk), lactation order (n) and lactation stage (days). From the results obtained, the following can be stated. The installation of fans had an effect on milk yield over the whole follow-up period where before installation the mean milk yield was lower (P > 0.05) and after installation the milk yield was higher (P < 0.01). The effect of fans was also observed on milk constituent content. Considering only the summer months (June, July, August), it was found that there was a demonstrable increase (P < 0.01) in milk yield in cows after installation of fans. Regarding milk constituents, the installation had no demonstrable effect (P > 0.05). Nevertheless, a similar trend of reduction in fat and protein percentage can be seen as in the whole follow-up.
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Vlivy působící na kvalitu a složení bazénových vzorků mléka u dojnic českého strakatého skotu v konkrétním chovu
Strnadová, Jitka
The aim of the diploma thesis was to evaluate the influences on the quality and composition of bulk milk samples of dairy cows of Czech spotted cattle. The observation took place within one calendar year (January to December 2022) in the selected breeding of GenAgro Říčany a.s., when we took a total of 52 milk samples. The obtained samples were analyzed and, together with the data from the temperature-humidity sensors (HOBO), sorted in the Microsoft Excel program and subsequently evaluated in the STATISTICA 14.0 program. The highest number of somatic cells (SB) in milk was in the summer, while the lowest in the winter and spring (P < 0,05). The highest number of SB was in the temperature zone at 20.1 °C and the lowest at 0 °C (P < 0,05). The highest number of SB was found in the period with the highest average lactation order (P < 0,05). Regarding the influence of lactation phase, it was found that the highest number of SB was found in dairy cows in the period with the highest average lactation phase (P < 0,05). No significant differences (P > 0,05) were found for the other milk productivity parameters. Over the entire follow-up, the freezing point averaged -0,552°C in all cases.
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Vliv pořadí dojnic holštýského skotu v dojírně na parametry mléčné užitkovosti ve vybraném chovu
Gašpariková, Tereza
This bachelor thesis focuses on the effect of the order dairy cows of Holstein dairy cattle in the parlour on milk yield parameters. The monitoring was carried out in a selected breed for individual sections, morning and evening milking during all seasons (Janua-ry, April, August, October). The monitoring included determining of the order of cows in the parlour, preference of milking place or preference of left or right side of the parlour. At the same time, milk yield was monitored, specifically milk yield (kg milk), lactation order (n), lactation phase (days), fat (%), protein (%) and lactose (%) content. Data of milk yield of dairy cows were obtained from the program FARMSOFT and from ČMSCH, a.s. (milk yield control). There were monitored 2 164 cows during the year. According to results cows with higher lactation order (older cows) and related higher milk yield entered the milking parlour first. On the contrary, cows with a lower lactation order entered the parlour last. The cows with higher milk yield preferred the first and last milking stalls. It was also found that older and higher yielding cows chose the left side. From an economic point of view, this farm was in profit in 2022. The main reason was the higher farm gate milk price and increased milk yield.
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Vliv teploty vzduchu ve stáji na parametry mléčné užitkovosti dojnic českého strakatého skotu v konkrétním chovu
Hanáková, Šárka
The aim of this thesis is to analyse the effect of air temperature on milk yield parameters of dairy cattle in a specific breeding system. The milk yield parameters included milk yield (kg milk), lactation order (n), lactation phase (days) and milk components content (% fat and % protein). The observations were carried out between January and December 2022. Data on milk yield parameters were obtained from the results of the Performance Check (PC). A total of 7 863 individual cases (dairy cows) were evaluated. During the monitoring period, air tem-perature in the stable (°C), relative humidity (%) were collected using a temperature-humidity sensor (HOBO). The results showed that temperature had no statistically significant effect on milk yield, lactation stage and lactation sequence. On the other hand, there were significant differences in the content of milk components, which were fat and protein (P < 0.01). In the case of relative humidity, there was a statistically significant effect on milk yield, where milk yield decreased with increasing values of relative humidity in the cows studied (P < 0.01). Relative humidity also influenced fat and protein content (P < 0.01). In the case of THI, there were no statistically significant differences in milk yield, lactation order and lactation phase (P > 0.05), but statistically significant differences were found for milk components (P < 0.01).
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Analýza mléčné užitkovosti u dojnic českého strakatého skotu ve vybraném chovu
Jánišová, Lucie
In this bachelor thesis the analysis of milk yield of Czech fleckvieh cattle in selected breeding was performed, with regard to external and internal influences affecting milk production. The monitoring was carried out for 12 months, in the period from 01/2019 to 12/2019 in the stable Lubník, which belongs to the agriculture company ZOD Žichlínek and result from milk recording scheme. The monitoring was focused on fluctuations in milk production and milk elements, especially fat and protein, depending on individual seasons, the order and phase of lactation. Based on the results, we can conclude that the highest milk yields were achieved by cows at the 4th and higher lactation, dairy cows with a lactation phase of up to 100 days and in the spring period. The highest fat and protein content in milk was found in dairy cows with a lactation phase above 301 days. Dairy cows had the highest fat content in the summer and the highest protein content in the autumn.
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Zhodnocení vztahu kvantitativních a kvalitativních parametrů mléčné užitkovosti dojnic holštýnského plemene v konkrétním chovu
Poláčková, Pavlína
The aim of this bachelor’s study was to evaluate an effect between quantitative and qualitative parameters of milk efficiency. As a quantitative parameter was used milk yield. Observed properties from qualitative compounds were fat, protein, lactose, somatic cells and carbamide. To the problem was processed review of literature. Evaluation was realised in cooperative farm AGROS Vyškov-Dědice which deals with breeding of the Holstein breed with average efficiency 35 kg milk per day. Dates of milk efficiency were taken from the control efficiency and afterwards putted through analysis in MS Excel. It has been found that with rising milk yield was increase fat and also protein content which is not common in our farms and it is contrary to commonly stated literature or other authors. Reversely lactose had been evaluated rather indirect impact – the lactose content decreased with increasing milk yield. No correlation was found for somatic cells and carbamide with milk yield.
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Vliv vybraných parametrů chovatelského prostředí na tučnost mléka holštýnských dojnic
Stoklas, Josef
The aim of this thesis was to find out what effect the selected breeding parameters have on the milk fat content of dairy cows. The experiment took place troughout the whole year (from November 2018 to November 2019). Observations were conducted once a month. A total of 160 dairy cows were evaulated and all of them were in the stable with loose litter boxes. Dairy cows were compared at the top and at the end of lactation. The basic life manifestations frequencies of dairy cows were evaluated. These life manifestations did not change during the lactation in the monitored groups. As far as life manifestations are concerned then monitored dairy cows were mostly lying (from 60 %) regardless of the lactation stage. When they were lying down they preferred left side of the body, the difference was 0,5 %. Significant differences were found in milk components of the milk. Significant difference was also in fatness, dairy cows at the top of lactation had 3,86 % of fat and dairy cows at the end of lactation had 4,56 % of fat. The difference was also in the seperated feed. At peak lactation on the upper sieve remained just 4,6 % and at the end remained 18,1 % of feed.
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