|
|
The level of energy metabolism of dairy cows and the composition of milk fat
KAUTSKÁ, Jitka
The aim of this study was to evaluate the relationship between the levels of energy metabolizm of high-yielding dairy cows and the amount of milk fat. Furthermore, the proportion and content of fatty acids in milk fat. The effect of antiketogenic prophylaxis of the monenzin-containing preparation was also evaluated, and the metabolic parameters were evaluated at the same time. The experiment took place in the breeding of high-yield dairy cows of the Holstein breed in the company Agropodnik Košetice a.s. s The average milk yield in breeding was 11,553 kg of milk in the observed period. The highest acid content was recorded in the first month of lactation and their content gradually decreased. Likewise, they had the highest proportion of short-chain saturated fatty acids (SAFA). The application of monenzin has a proven incidence of subclinical ketoses, both in first-calves and in cows for second and subsequent lactation. The reduction of ß- hydroxybutyric acid in blood and milk confirms the importance of the antiketogenic prophylaxis used.
|
|
|
Influence of selected factors on fertility and longevity of cows of Holstein cattle
KAUTSKÁ, Jitka
This thesis deals with the influence of level of yield, causes putting out dairy cows from the breed and age at first calving on fertility and longevity of dairy cows of Holstein cattle in the agribusiness Agropodnik Košetice, a.s. Monitored indicators of dairy cows of Holstein cattle were the amount of milk in the first lactation in kg, functional longevity in kg of milk, functional longevity in days and the causes of elimination of dairy cows from the breed. From the results of monitored herd it can be concluded that prolongation of age at first calving will increase functional longevity in days statistically significantly. In contrast, there was not found statistically significant effect of age at first calving on functional longevity in kg of milk. Ascertained results of the monitored dairy herd did not confirm that increasing milk yields deteriorated reproductive indicators. The length of the service period was shortened statistically significantly with increasing the yield of milk in kg per one hundred days ((P 0,05), with the yield for the first entire lactation (P 0,001) and the order of lactation (P 0,001). In the monitored herd the dairy cows that were eliminated due to postpartum paresis (2570.70 days) reached the highest longevity and also reached the highest milk production for functional longevity in kg of milk (49,919.95 kg).
|
|
|
Analysis of selected effects on milk production and fetility in holstein cattle herd
KAUTSKÁ, Jitka
Cattle production plays a very important role in agriculture and economics. It provides key inputs to crop production, but it also forms an integral part of human nutrition. For us the most bred cash breed is Holstein cattle. Its share of the total cow population in the Czech Republic is now 57 percent. The average yield in Holstein cattle in the Czech Republic is 9000 kilograms of milk, making us one of the major EU countries. The aim of my bachelor?s dissertation was to evaluate selected influences on milk yield and fertility in high productive herd of Holstein cattle. Evaluation was hold in ?Agropodnik Košetice, stock company? Chyšná on the farm where is kept 389 Holstein milking cows. On milk cows were monitored indicators such as milk yield in kilograms of milk, lactation, age at first calving, calving month, height in loins, the length of service period and the course of involution of the uterus. From the ascertained results emerge a provable impact sequence from lactation and calving month on milk yield. Milk production in the first lactation was 9 526.97kg, 2nd lactation was 9 727.96kg, 3rd lactation was 10 628.06kg and 4th and other lactations were 11 272.52 kg. In the autumn there was higher milk production at milk cows were calved and the production was 11 163.48kg. The cows calved in summer was yield about 836 kg less. The influence of the length of uterine involution service period was statistically highly significant difference (P ? 0.001) between the healthy group and the group treated within 40 days. The length of a service period was 142.63 days at healthy cows. Cows that treated the longest took about 251 days. As statistically significant (P ? 0.01) was shown the influence of the height of loins at first born calf on milk yield in kilograms of milk. Highest heifers in the herd produced milk at 1 lactation of 10 222.94 kg. Cows with a height in loins up to 142 cm and from 143 cm to 146 cm produced the lactation about 1000 kg lower. Also, the impact of age at first calving and the yield in kilograms of milk on fertility was found to be statistically significant (P ? 0.01). At cows calved at the age of 652-700 days was the longest service period 176.86 days. Cows calved at the age of 751 days had the length of service period 118.67 days. As statistically insignificant was evaluated only the impact sequence of lactation on service period. The results show the importance of herd management, because whichever monitored has impact on affecting the economic efficiency of milk production.
|
|
| |
|
| |
guest ::
RSS feed.