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Zhodnocení výsledků reprodukce dojnic holštýnského a českého strakatého skotu ve vybraných chovech
VÁCA, Vít
The bachelor thesis deals with the issue of reproduction of dairy breeds of cattle, specifically Holstein and Czech pied cattle. The first part of the work includes a general acquaintance with breeds of Holstein cattle and Czech pied cattle, their basic characteristics and history. Another part of the work is focused on cattle reproduction. This chapter covers the main reproductive indicators, factors affecting reproduction and problems related to dairy reproduction. The following chapter deals with a detailed description of the estrous cycle of cows. The aim of the work is to evaluate the level of fertility and other selected indicators of dairy cow reproduction (especially insemination interval, service period, pregnancy after the first insemination, etc.) breeds Holstein cattle and Czech pied cattle in selected farms. Data from selected breeds were obtained from the database of the breeding organization for the breeding year 2020/2021. This data was then processed into tables and graphs and evaluated.
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Analýza stáda českého strakatého skotu v podhorské oblasti
MAČLOVÁ, Jaroslava
The aim of the bachelor thesis was analyze of a milk production, fertility and the assessment of the effect on a lactation sequence on the performance in a herd of a Czech pied cattle kept on a family farm at a foothill. Values of 65 Czech pied dairy cow which ended the lactation in 2016 was adapted in the thesis. The dairy cows was sorted into four groups by the lactation sequence (the 1st lactation, the 2nd lactation, the 3rd lactation, the 4th lactation). The production and a quality of the milk was evaluated through the whole herd during 2016. The average production by the lactation sequence was in the 1st lactation 4286 kilogrammes of milk at P 0.001, the 2nd lactation 5888 kilogrammes of milk at P 0.001, the 3rd lactation 5783 kilogrammes of milk at P 0.001 and in the 4th and next lactations 6364 kilogrammes of the milk, the production of the whole herd was 5580 kilogrammes contains 3.94 % of the fat, 3.32 % of the proteins, 5.03 % of the lactose, 229 thousand/millilitre of somatic cells. The average age at the first calving was 1037 days, the length of the herd's interval was 394 days, the insemination interval was 96 days, and the service period was 111 days.
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Produkční schopnost býků Českého strakatého skotu
LAPKOVÁ, Kristýna
The aim of this bachelor thesis was to evaluate selected indicators of fattened bulls of the Czech Pied Cattle in intensive farming conditions in a farm in the South Bohemian Region. The total rating was included 371 bulls, the data were evaluated for years 2016 and 2017. The live weight before slaughter, the age at slaughter, the average daily gain, net gain, carcase weight and his classification according to SEUROP. Statistical data was processed using the program Microsoft Excel 2016 and Statsoft statistica. The average age at slaughter and live weight were 586.2 days respectively 731.8 kg in 2016, in 2017 reached 626.1 days respectively. 749.5 kg. The weight of the carcase in 2016 was 412.2 kg, the following year increased by 8.9 kg. The net gain increase was significantly higher in 2016. All these differences were statistically significant. When categorized into classes of meatiness, it reached 73.8 % of the class "U" with a carcase weight of 426.3 kg, 25.1 % of the "R" class with a carcass weight of 384.4 kg and 1.1 % of the "E" with a carcass weight of 497.3 kg. When evaluating the impact of the slaughter age on the individual indicators, the differences between the groups were statistically significant.
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Analýza rozdojování u plemenic skotu
DIDIOVÁ, Marie
The aim of the bachelor thesis was to compare the results of the period of dairy culling of the Holstein cattle and Czech Pied cattle kept under the same conditions in relation to the reproduction indicators. The evaluation was carried out from the control of the performance of dairy cows at the farm Mojné in southern Bohemia, near Český Krumlov.
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Analysis of milk yield and fertility in the herd of dairy cows of Czech Pied cattle
VAFEK, Jan
Current economic conditions emphasize the efficiency of milk production. The two main factors that have an influence on the economics of dairy cattle are the milk yield and the reproduction. Therefore, the effort of breeders of dairy cattle is to achieve a milk production as high as possible while maintaining a good reproductive performance. The aim of the thesis was to evaluate the selected effects to the indicators of fertility and milk production in selected Czech Pied cattle herd. Data were evaluated from June 2008 to October 2013. In the evaluation were included 290 cows that had completed lactation. For the monitored cows was evaluated the effect of lactation on a milk production, the effect of genotype and processing breed on the performance of the and milk components, as well as on selected reproductive indicators . For observed genotypes C1a C2 has been shown that cows of genotype C2 had a statistically significant higher milk yield milk (p < 0.05 ), while the cow with a genotype C1 had significantly higher fat content (p < 0.05). The effect of genotype on age at first calving as well as the influence of the length of the service period, interim and the protein was not statistically significant. An effect of lactation number on the content of the monitored constituents and quantities of milk was statistically significant (p < 0.05), as well as the yield for each lactation. Concurrently was shown an influence of age at first calving to the number of lactation of the monitored breed. In the analyzed dataset was shown the influence of milk production in the length of the service period and the interim. The service period for productive cows with milk yield over 10000 kg of milk per lactation was higher by 17.5 days and the interim by 42.3 days compared with cows yielding 6000 kg of milk per lactation (p < 0.05). It was also shown to influence of a refined breed on milk production and milk components . The crossbreeds of Czech Fleckvieh with the red Holstein breed had the highest average yield per lactation (7885,07 kg of milk) compared to pure-bred cows and the crossbreeds with the breed Ayrshire, which were statistically significantly higher in fat and protein compared with other groups of cows in the monitored breed (p < 0.05). The effect of processing crossing on the length, service period and interim haven´ t been proved in the monitored herd.
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Analysis of dairy cattle herds
SCHÖNOVÁ, Eva
The aim of this thesis was to assess and evaluate the level of milk production and fertility in two breeds of dairy cattle studied. Studied were 41 Holstein cows (H) and 36 Czech Pied cattle (C). Cows were selected from a total of 310 pieces, were further divided into two groups according to genotype and in turn the last closed lactation. Cows were kept in the same technological conditions, at the same level of nutrition and care. The indicators of fertility was observed insemination interval and service period. Length of insemination interval in Holstein cows was longer (66,22 days) than in Czech Pied cattle (64,58 days). Length of service period in dairy cows of Holstein cattle was at 142,10 days and Czech Pied cattle 149,94 days. Differences in both parameters were not statistically significant. The performance indicators were monitored in milk volume and content of individual components in milk - % fat, protein and lactose. The average fat content of Holstein cows was lower (3,95 %) than in cows of Czech Pied cattle (3,98 %). The average protein content in dairy cows reached 3,32 % Holstein and Czech Pied cattle 3,48 % at P ? 0,001, and average content of lactose in dairy cows of Holstein cattle was 4,89 % while the Czech Pied cattle were at the same level (4,89 % respectively 4,90 %). The average yield of Holstein cows for standardized lactation was 8 504,88 kg of milk per lactation, reaching a 9 459,81 kg of milk. The Czech Pied cattle sires in both cases, the average yield is lower by 1 640,35 kg of milk or a 1 513,17 kg of milk at P ? 0,001. From an economic evaluation of milk production in a joint breeding both breeds were found in Holstein cattle favorable indicators. Over the entire lactation, the difference (at the actual realization prices of CZK 8,66 / liter of milk in 2011) 13 104,06 CZK / l of milk.
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ANALYSIS OF MILK PRODUCTION AND FERTILITY OF THE HERD OF CZECH PIED CATTLE
PATÁK, Martin
It is an essential condition of economic production in livestock farming to ensure an adequate level of milk yield and reproduction in dairy cattle herds. Therefore, it is the interest of all dairy farmers in conventional agriculture to have a herd capable of high yield which would be mainly profitable. The aim of this thesis was to evaluate selected indicators of milk yield and fertility rates of the Czech Pied cattle in the agricultural society Dublovice JSC. The observation included 430 cows that finished lactation in the control year 2010/2011. The cows were divided according to the sequence of lactation into groups 1, 2, 3, 4 and other lactations. Furthermore, they were divided according to genotypes (C100, C1, and C2) and their fathers. By the groups sorted by the sequence of lactation there was found a statistically significant difference in milk yield between 1st and 4th, 2nd and 4th, 3rd and 4th and other lactations on the importance level P<0,001. The highest average yield reached the cows with the genotype C100 of 4 and other lactations (8 371 kg). However, the significant effect of genotype on the productivity by the cows according to the sequence of lactation was not confirmed. The highest average yield (8 277 kg) was reached by the daughters of the bull REZ 376 (C59R) and the statistically significant difference on the level of importance P<0,05 was proved. By the service period was significant only the influence of fathers. By the meantime and the first calving age were the differences between groups of no statistic importance. The most common reason for cow elimination was disease of mammary gland (25.9% of the total number of eliminated cows) and postpartum difficulties (20%). By the cows in the observed herd was found a higher milk yield (7 423 kg) in comparison to the average yield of the Czech Pied cattle in the Czech Republic (6 548 kg). Service period, meantime and the first calving correspond to the farming aim of the Czech Pied cattle.
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Production and fertility of dams for multiple milking
TRCH, Jan
The aim of this thesis was to evaluated fertility and milk performance due to multiple milking technology which was used. The monitoring was carried in 2011 in farms Agrospol, Malý Bor a.s. and the farm Dub. System evaluation of fertility and milk performance of dairy cows at multiple milking were evaluated in 186 lactations of Czech pied cattle breeding. The average number of milking in the parlour was 2.96x/day and robot 2.36x/day. 107 lactations were obtained during milking in the milking parlour and 79 of lactation during milking by robots. In this thesis were measured indicators of fertility (insemination interval, service period, the mean time and age at first calving) and indicators of milk production (lactation length, the amount of milk fat, protein and lactose content). In the reproductive indicators were taken statistically highly difference in age at first calving, where the average difference was 195 days. For other indicators of fertility were all statistically significant results in favor of milking in the milking parlour (2.96x/day). Czech pied cattle milked in the milking parlour per normative lactation average amount of milk produced 8 599.8 kg, cows milked by robot 7 272.5 kg. Among these values was statistically highly significant difference. The best results in the production of milk per normative lactation were gained by milked cows in the milking parlour (9 284.4 kg) and the second lactation cows milked in the milking parlour (9 033.0 kg) on the third and more lactation. The lowest milk production in normative lactation gained dairy cows milked by robot at first lactation (6 874.7 kg). The higher average fat content had dairy cows milked in the milking parlour with a value of 4.47 %, dairy cows milked by robot had fat content of 4.15 %. Between these values was statically highly significant difference. In the average protein content in dairy cows has been demonstrated statistically significant difference. Dairy cows milked in the milking parlour reached the value 3.41 % compared to cows milked by a robot, where the average value of protein was 3.47 %. The difference in lactose content between groups was not statistically significant.
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Analysis of Czech pied cattle milk performance and fertility.
NÁVARA VOLFOVÁ, Kateřina
The main goal of all milk cattle breeders is herd making profit {--} the herd with good reproduction and consequent high production performance. Such a goal can only be reached if the herd is of quality genetic base. Cow{\crq}s milk performance is one of important factors influencing final economic results of milk production. The aim of this Diploma work was to examine lactation course and level as well as reproduction of high-performance Czech pied diary cows with regards to their genetic base. The diary cows (190 pieces) on lactation within 27th March 2008 {--} 13th June 2008 were examined. The examined cows were divided into three groups based on number of their lactation. These groups with cows on 1st, 2nd, 3rd lactation were further divided with regards to their genetic base into herd groups registered as C1 and C2. The sub-herd group C100 was isolated from C1 herd group. To each lactation group, 2{--}3 bulls were assigned based on the highest number of daughters in specific lactation group. Minimum criterion for bull assignment to lactation group was set on at least 5 daughters in the group. Reproduction performance was examined in these groups. The milk performance was evaluated based on 305 days usage, lactation curve persistence index and the lactation curve course in individual groups. The herd-group C2 with highest genetic base of diary breed proved the best results in all lactation groups with regards to reproductive performance. The best results were reached on 3rd lactation. The link between genetic base and reproduction performance of Czech pied cattle was not proved. Neither the link between genetic base and milk performance was proved. The influence of lactation number on most of examined factors was proved. The father{\crq}s influence on reproduction or milk performance was not clearly proved. However, the results may be distorted for lack of diary cows in groups examined under this criterion. Finally, the direct link between reproductive and milk performance was also not clearly proved. To summarize our results, we can state that the diary cows in examined herd were above the milk performance average of Czech pied cattle bred in Czech Republic. At the same time, the reproduction performance was just on average of Czech Republic.
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