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Vyhodnocení reprodukčních ukazatelů ve vybraném chovu dojnic v ZOD "Podhradí" Choustník
NEZBEDOVÁ, Marie
The aim of this thesis is to evaluate chosen influences on the extent of reproduction of randomly chosen milk cows that are bred in the same conditions. The chosen influences such as breed, age of the first calving, time of year of calving and level of yield were observed within breeds of Czech Fleckvieh and Holstein cattle. Evaluation was carried out in ZOD "Podhradí" Choustník company, specifically in Budislav farm. 191 cows were chosen for the basic sample. 95 of them were Holstein cattle and 96 were Czech mottled cattle. Chosen influences were evaluated according to data gained from the set of milk yield inspections. A statistically significant difference was observed between Czech ticks and Holstein cows in the length of service period per second and first lactation where Holstein cows have a second lactation period longer than 44 days (P <0.001). Evaluation of first calving age did not show any influence on the level of reproduction neither within Czech Fleckvieh nor within Holstein cattle. During the annual evaluation, it emerged that Holstein cows calved in spring and winter have significantly bigger insemination interval compared to cows that were calved during summer or autumn. This fact was also proven by correlation analysis. This analysis also confirmed the relation between annual period and insemination interval Rxy=0,21(P<0,05). The correlation analysis also proved the relation between annual period and service period as well as interim of Czech Fleckvieh cattle Rxy= 0,327 (P<0,01). Statistically significant influence was not proven within Holstein cattle. Correlation analysis only pointed out the relation between yield and service period Rxy=0,213 (P<0,05). Unlike Holstein cattle, gradual increase of service period figures and interim depending on yield was noticed. Breeding cows milking more that 7,5 thousand kg of milk per lactation had service period of 132 days (P<0,01) and interim 407 days (P<0,01). Economical losses caused by prolonged interim during monitored herd of cattle reached 400.490 CZK in year of 2016.
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Influence of selected factors on the quality of colostrum and calves during milk nutrition
DVOŘÁKOVÁ, Petra
The basis of every breeding is successful reproduction. Without quality care for cows during pregnancy and aftercare for cows and calfs the company can not prosper. There is a series of aspects that may have negative impact on the quality of the colostrum, which affects the viabilityof the calves. The aim of this work was to literary review the effects that have an impact on the quality of the colostrum and on the calves itselves during the colostrum nutrition and the lactic nutrition. Among the analyzed effects there were selected order of lactation, age at the first calving, level of productivity, season of born of the calf, length of the dry period and the process of bloody discharge. All the data used in this thesis was obtained from reports of registration of bovine animals and reports of productivity monitoring of the agricultural association Černovice from May 2013 to December 2014. The monitored group was made of 243 cows of Czech Pied cattle and 233 calves. The paper contains an evaluation of a quality (density) of the colostrum reviewed by order of lactation, age at the first calving, level of productivity, season of birth of the calf, length of the dry period, calving interval and bloody discharge, it also contains the correlations between lactation and the quality of the colostrum, the age at the first calving and the quality of the colostrum, level of productivity and the quality of the colostrum, the season of birth of the calf and the quality of the colostrum, the time of the dry period and the quality of the colostrum, the bloody discharge and the quality of the colostrum, the length of the interim period and the quality of the colostrum and the viability of calves and the quality of the colostrum.
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