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Mléčná užitkovost plemene lacaune ve vybraném chovu
CHODCOVÁ, Anna
This thesis deals with the influence of age of lacaune breed ewes on milk performance, influence of parity and influence of stage of lactation on milk performance in terms of the milk yield and the content of individual components of milk. Further was evaluated the influence of rams on milking. Data from farm Statek Horní Dvorce s.r.o. were used and data from Svaz chovatelů ovcí a koz z.s. were used too and entries from years 2014, 2015, 2016 and 2017, when the milk performance was monitored by method AT. The influence of rams on milking has not been fully demonstrated. For the four comparing lines, the statistically significant difference was only between LINUX and LUPIN, and only in one year of performance control over the three years compared. From the point of view of the influence of age on total milk yield in the studied farm, fat and protein content of lacaune breed increased with increasing age, whereas the lactose content showed a decreasing trend. The influence of parity had a significant effect on the monitored parameters of milk. With an increasing parity, the protein content was slightly increased, the fat and lactose content decreased. Ewes on the second lactation showed the best results in milk yield, since the third lactation was recorded in milking a decrease. The influence of stage of lactation on milking and on the content of individual components of milk was also significanted. With prolonged lactation the milk yield and lactose content were decreased. The fat and protein content has been shown to increase with the increasing of the stage of lactation.
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Mléčná užitkovost plemene lacaune ve vybraném chovu
CHODCOVÁ, Anna
This thesis deals with the influence of age of Lacaune breed ewes on milk performance (milk yield and the content of individual components of milk). The length of lactation was also evaluated. Data from farm Statek Horní Dvorce s.r.o. were used and entries from years 2012, 2013 and 2014, when the milk performance was monitored by method AT. With the view of the fact that the standardized lactation in 2012 was set on 240 days while since 2013 the required length was 150 days, the year 2012 was not included into the comparison due to dubiousness of the results. The influence of age of an ewe on total milk yield in the studied farm is not clear and cannot be established with significant certainty, although in the studied years the milk performance was higher than the average in the Czech republic. In the 2013 was the total milk yield 323 kg of milk and in the 2014 was 307,4 kg of milk. The findings of basic milk parameters of individual components of milk show that the age of an ewe has an influence on the components. With growing age the content of fat was decreasing. At three-year-old ewes the content of fat was 7.36%, while at four-year-olds the content reached only 7.3%. The content of lactose also seemed to decrees with age. At three-year-old ewes the content of lactose was 4.86%, while at four-year-olds the content was 4.63%. However, the content of protein had growing tendency. At three-year-old ewes the content of protein was 5.61%, while at four-year-olds the content was 5,89%. Further was evaluated the length of lactation. It was shown an increase in the average length of lactation as they get older ewes, but the effect on lactation length was also the start date of the dry period of herd.
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