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Summary: High-productive dairy cows are prone to metabolic and
health disorders after calving because the energy produced in milk is
much higher than the one taken through rations before and after calving.
In the first part of the investigation, the most appropriate way of
feeding was determined which could be taken as a basis for the new milk
production tehnology. Its application can provide better utilization of
genetic milking capacity and bring higher profits in milk production.
Influence of rations with different level and concentration of energy in
the preparatory stage of lactation on the results of milk production and
cows' health condition was estimated by analyzing blood parameters
(glucose, free fat acidds, cholesterole, AST-activity, The other part of
theinvestigation, involving blood parameters analysis in young heifers,
which influence the condition and the intensity of metabolism was
established on determining the linkage with production capability of the
same animals after calving. The expected results will permit earlier
prediction of production capacity of heifers and in this way introduce new
criteria in breeding for high-productive dairy cattle.
Keywords: milk production, cows, heifers, dry period, early lactation, level of energy, complete diets, body weight, glucose,albumines, globulines, cholesterol, FFA,AST, growth hormon, thyroxine, insulin
Research goals: Investigations conducted within the project should
contribute to establishing new and more effective technologies in milk
production and breeding methods. Therefore, the aim of the investigation
was: 1. to determine the most favourable energy levels in rations fed to
high-productive HF cows in preparatory stage of lactation (dry period and
90 days of early lactation) and thus allow more effective utilization of
their genetic milking capacity. 2. to establish possibilities for earlier
prediction of the condition of metabolism and production ability of heifers
after calving by linking them with blood parameters (glucose, free fat,
acids-SMK, cholesterole, GOT activity, growth hormone, thyroxine, insulin)
taken at different growth stages. The investigations with the project are
expected to contribute to finding the appropriate regime of feeding cows
during the period when production capacity for milking is established, and
determining rations with appropriate energy levels, which can help reduce
frequency of metabolic and health disorder in cows' puerperium. Better
metabolic and health condition should result in better fertility of cows
and more effective utilization of their genetic milk production capacity.
By linking metabolism condition of heifers in early stage and after
calving, checking blood parameters, with their production abilities will
permit to introduce nev physiological criteria in cattle breeding and
earlier prediction of production capactity of heifers.
COOPERATION - INSTITUTIONS
Name of institution
: VUPIK Vukovar Type of institution: State institute Type of cooperation: Joint publishing of scientific papers City: 56230 - Vukovar, Hrvatska
Name of institution
: Mljekara "Pionir" Županja Type of institution: State institute Type of cooperation: Occasional exchange of information City: Županja, Hrvatska
: Nova tehnologija visoke proizvodnje mlijeka. Type of achievement: Technology Authors: Zvonimir Uremović, Marija Uremović
: Nova metoda predviđanja proizvodnih sposobnosti junica Type of achievement: Technology Authors: Prof.dr. Zvonimir Uremović, Prof.dr. Marija Uremović Other information about the project.