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Polymorphism of some enzymes as factor affecting milk fat composition
KLOJDA, Martin
The aim of this diploma thesis was to determine allele and genotype frequencies for g.10329C>T (A293V) polymorphism in the SCD1 gene in dairy cow populations, establish effects of this locus on milk production traits and fatty acids composition. At first, allele and genotype frequencies were determined. Subsequently the effect of this polymorphism on milk production traits was proved and effects of this polymorphism were demonstrated as well. For the determination allele and genotype frequencies the PCR/RFLP technique was applied. In this diploma thesis the effect of polymorphism g.10329C>T (A293V) on milk production traits was demonstrated as well as the effects of this polymorphism on fatty acids composition. The findings following from this diploma thesis show economical and health benefits of this SCD1 locus.
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Vliv věku při 1. otelení na užitkovost a dlouhověkost dojnic
HARANTOVÁ, Barbora
In this bachelor thesis, it has been dealt with evaluating an influence from level of rearing during the first calving to the performance and longevity of dairy cows from chosen herd near VOD Svatobor. Gathered data has been filtered and ordered due to cause of exclusion, age in first calf, order of lactation and lifelong performance. There were 100 dairy cows to be observed together with their market production of milk. From this set 63 cows were from Czech mottled breed and the rest 37 cows from Holštýn's breed. Cows from both breeds has been housed in same stable and with the same aliment and treatment conditions. From results we can see that belated swallowing has little influence on the amount of produced milk. On the other hand, belated swallowed cows, so even calved cows, did not produce larger amount of milk. The only advantage of belated swallowing has been higher percentage of fat and proteins in milk. The most frequent reason of exclusion in both breeds has been illness of udder. Due to this fact cows were excluded on 1.67 lactation in average. The illness of udder may be caused by insufficient hygiene or incorrect milking procedure.
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Vliv vybraných faktorů na dlouhověkost dojnic holštýnského skotu
HUBÁČEK, Tomáš
The aim of this thesis was the evaluation of selected factors on milking yield and longevity of the selected herd of dairy cows of Holstein cattle in the company Prima Agri a.s. There were monitored the indicators of dairy cows of Holstein cattle such as genotype, milk performance, the order of the lactation, the age of the first calving, the length of interim and of the service period, lifetime performance and reasons for elimination. The data were taken from the dairy cows whose first lactation was finished from January 1st to December 31 st 2016. 385 dairy cows were included to the monitoring. As for the genotype influence on milk performance, statistically significant difference was found out between the first and the fourth and the third and the fourth group on the level of significance (P<0,01). The effect of the age of the first calving on milk performance in kg of milk on first lactation wasn´t statistically provable (P>0,05). Statistically highly significant difference was found out by the effect of the order of the lactation on milk performance on the level of significance (P<0,01) between the groups of the first lactation and of the other groups of lactation. Statistically significant difference was found out between the 2nd lactation and the 4th and higher lactation on the level of significance (P<0,05). The effect of the genotype on the length of interim and the effect of the order of lactation on the length of interim weren´t statistically provable (P>0,05). The effect of genotype on length of the service period was statistically significant on the level of significance (P<0,01) between the group H2 and the group H3. Statistically significant difference (P<0,05) was found out between the groups H1 and H3, H1 and H4 and as well as between the groups H2 and R. The effect of the order of lactation on the length of service period was statistically highly significant on the level of significance (P<0,001) between the groups of the first lactation and of the other groups of lactation and between the groups of the second and fourth and higher lactation. The effect of the genotype of eliminated dairy cows on lifetime performance in kg of milk was statistically highly significant on the level of significance (P<0,001) between the groups H 1 and H2, H1 and H3, H2 and H3, H2 and R, H3 and R. An average number of eliminated dairy cows was 28,62 %. The biggest number of the eliminated dairy cows was on the grounds of fertility disorders and that is 35%. Longevity of the eliminated dairy cows was 2,7 lactation.
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Ekonomická analýza produkce mléka u dvou užitkových typů skotu
DAŇHELOVÁ, Lenka
The aim of thesis was to conduct evaluation of milk yield and fertility indicators of Czech Flecvieh cattle and Holstein cattle breed which were kept in chosen agriculture company and to determinate a possible difference of milk production costs between individual productive types of the cattle. Data used to create this thesis was from agriculture company STAGRA, spol. s r.o. which breeds dairy cattle. According to specified thesis goals dairy performance indicators (kilograms of milk, % and kg of fat, % and kg of proteins) and fertility indicators (first calving age, calving interval duration) were assessed separately in Heřmaneč cowshed (H2 Holstein cows, 210 pcs.) and Skrýchov cowshed (H1 Holstein cows, 24 pcs. And C1 Czech Fleckvieh cows, 59 pcs.). Milk performance and fertility indicators were evaluated for control year 2014/2015. Cost items of dairy cattle breeding were obtained from accouting of the calendar year 2014. Due to operational reasons only two cowsheds were observed Heřmaneč with Holstein breed (H2) husbandry and Skrýchov were Czech Fleckvieh cows (C1) were dominant. Data files were processed by relevant statistical methods. It was found that H2 group dairy cows reached the highest milk yield (10 395.17 kg) with average calving interval of 369 days. On the other hand Czech Fleckvieh cows reached the highest protein (3.64 %) and fat (4.16 %) content in milk. H1 group dairy cows reached lowest calving age (25 month and 18 days). The milk production cost comparison within observed productive types showed that costs per 1 l of milk were higher in the Skrýchov cowshed, on the contrary feeding day costs were higher in Heřmaneč cowshed.
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Comparison of reproductive health programmes at the dairy herd
REŠOVÁ, Eva
The aim of this thesis was to compare the use of two hormonal preparations for the preparation of dairy cows to be inseminated, considering the matter of success, as well as the matter of the economy. The observation took place in the Agricultural cooperative Chodeč. 83 pcs of heifer were observed under the application of Ovsynch and 294 pieces of heifer were tested for Estrofan. The reference period was March 2013 - March 2014. Parameters were evaluated according to individual lactation. The milk yield (kg) of individual lactation was main parameter of milk performance. Fertility was indicated by these parameters: the length of the service period (days), insemination interval (days) and the insemination index.
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Performance traits of dairy cows stabled in tie stalls
MARKOVÁ, Lenka
The aim of this thesis was the evaluation of fertility and production traits stabled in tie stalls. 50 pure-bred Holstein cows were monitored and those traits were evaluated: interval of insemination, service period, calving interval, milk yield and content of milk protein and fat. All monitored cows finished standard lactation period (305 days) in year 2012. The evaluation was performed in relation to lactation order. Nearly all of fertility traits were evaluated as bad. The average interval of insemination was 83.7 days, service period was 171.6 days and calving interval was 444.9 days. Interval of insemination was rising up to 3rd lactation. However 4th and following lactation insemination interval was lower about 9.6 days in comparison with 3rd lactation. Service period values were getting worse according to higher lactation order, 2nd lactation service period was shorter about 19.2 days. Moderate statistical difference was found in calving interval between 2nd (505.4 days) and 3rd (395.1 days) lactation. Only 3rd lactation calving interval could be evaluated as satisfying. Calving interval values were rising up from 4th and higher lactation. The average milk yield of tie stabled cows was 9,869.5 kg per standard lactation period (content of milk fat 3.96 % and content of milk protein 3.44 %). Milk yield was rising up to 3rd lactation when it reached maximum values and slight decrease was recorded on 4th and following lactation. The average content of milk fat was increasing following higher lactation order. Statistically significant difference was found between milk protein content of 3rd lactation (3.37 %) and milk protein content of 4th and following lactation (3.53 %).
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The performance and fertility of pasture reared Holstein heifers
NEJEDLÁ, Alice
The aim of this thesis was to evaluate the parameters of the milk performance, reproduction indicators and health of Holstein cows that were raised on pasture. The data were obtained from 50 pure bred animals and its crossbreeds which had been grazed and the control group which was represented by 20 heifer which had been reared in stable. The evaluation of parameters was set on the first standardized lactation in the range of 240 to 305 days. The first lactation milk performance traits were: quantity of milk (kg), quantity and content of fat (kg; %), quantity and content of protein (kg; %). The fertility traits were: length of service period (days), insemination interval (days), age at first calving (days).
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Breeding of Normande cattle in Czech republic
KABÁTKOVÁ, Zdenka
The aim of this diploma work was to review the current state of breeding of Normande cattle in Czech republic. The reason for introducing the breeding of this cattle is some of its qualities. The most important of these include a higher percentage of casein in milk as well as good conversion of nutrients from the bulk feed and meat quality. Monitoring of cattle took place in four separate farms in years 2005 - 2009. There was created basic monitored group from pure Normande breed. Control groups were from pure Holstein dairy cattle, Czech Spotted dairy cattle. Fertility evaluation was done by following four indicators: age at first calving, insemination interval, service period and interlude. Evaluation of efficiency was based on milk production, protein production and content of the milk constituents. Results of fertility show that with the exception of age of first calving (832 days), the breeding goal hasn't been met to Breeders Association of Normande cattle. Value of insemination interval was 88,74 days, value of service period was 134,28 days and value of interlude was evaluated at 462,38 days. When we compare the Normande breed with Holstein breed, milk production of Normande breed is lower about 2025,4 kg, as well as lower protein production about 48,6 kg. Difference between fertility results for both breeds is within statistical discrepancy. In comparison with the Czech Spotted breed, the Normande breed is at least competitive in both indicators: fertility and efficiency as well. Content of milk constituents in Normande cows milk is significantly higher than in the milk of the other two breeds (4,38 to 4,41% of fat, 3,76 to 3,81% of protein, 4,89 to 5,20% of lactose). There was the highest culling (57.4%) in the basic selection of pure Normande dairy cows in comparison to selections of other breeds. The main reason for discarding were the other health reasons.
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INFLUENCE OF BREEDING TECHNOLOGY ON THE PRODUCTION CHARACTERISTICS OF CATTLE FIRST-CALVERS
VOBINUŠKOVÁ, Zlata
The comparison of the results of milk yield and fertility of first-calvers of Bohemian Spotted Cattle is the main aim of my thesis. Monitored cows (on the 1. lactation) were bred in different conditions (in the stanchion and free housing systems) and then housed in stanchion and free stalls production livestock barn. Comparison was made in the agricultural co-operative in Černovice u Tábora, which farms in the Region Pelhřimov district. Monitoring was carried out in 2009.
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