Abstract
The objective of the investigations described in this work was to determine the energy status and to make recommendations for correcting the cow diet at a farm of high-yield dairy cows, on the grounds of values for the concentration of organic components of milk and their ratios in individual milk samples. A total of 147 cows were examined, including 97 in the first and 50 in the second lactation. Average concentrations of milk fat and urea were within the physiological values. Namely, the milk fat concentration in cows in the first lactation was 38.88?5.07 g/l, and it was 36.47?4.82 g/l in cows in the second lactation, while the urea concentration in cows in the first lactation 3.16?0.58 mmol/l and it was 3.72?0.64 mmol/l in cows in the second lactation. The protein concentration in both groups of cows was below the physiological values, being 30.33?2.35 g/l in cows in the first lactation and 30.17?2.27 g/l in cows in the second lactation. Based on the ratio of urea and protein concentrations, as well as of fat and proteins in the individual milk samples, it was concluded that in most examined cows, both in those in the first and those in the second lactation, there is a deficit of energy, along with a deficit or relative surplus of proteins. On the grounds of the obtained results, recommendations were given for correcting the feed rations in the coming period. .
Highlights
Cilj istraivanja u ovom radu je bio da se na farmi visokomle~nih krava, na osnovu vrednosti za koncentraciju organskih sastojaka mleka i njihovog odnosa u pojedina~nim uzorcima mleka, utvrdi energetski status i daju preporuke za korekciju ishrane krava
Tako|e, individualne varijacije mogu zna~ajno da uti~u na rezultate procene, te se ova metoda smatra nedovoljno osetljivom za potrebe peripartalnog perioda (Jovi~in i sar., 2005; [amanc i sar., 2005a; Horvat i sar., 2009)
Zbog toga se preporu~uje da se parametri metaboli~kog profila odre|uju na reprezentativnom uzorku krava na ulasku u period zasu{enja, 2-3 nedelje pred o~ekivano telenje, te kod krava u ranoj laktaciji
Summary
Cilj istraivanja u ovom radu je bio da se na farmi visokomle~nih krava, na osnovu vrednosti za koncentraciju organskih sastojaka mleka i njihovog odnosa u pojedina~nim uzorcima mleka, utvrdi energetski status i daju preporuke za korekciju ishrane krava. Stojanovi}, Agencija za uzgoj u selekciju u sto~arstvu Republike Srpske, Banjaluka Savi} i sar.: Odre|ivanje organskih sastojaka mleka kao metoda ocene energetskog statusa mle~nih krava Savi} i sar.: Odre|ivanje organskih sastojaka mleka kao metoda ocene energetskog statusa mle~nih krava promene i adaptacija na pove}ane potrebe u energiji su pod kontrolom endokrinih mehanizama, te je iz koncentracije pojedinih hormona i njihovih me|usobnih odnosa mogu}e izvesti zaklju~ak o funkcionalnom stanju organizma.
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