2 research outputs found
Uticaj nivoa dobrobiti i stresnih faktora na krvne parametre kod krava tokom laktacije
The aim of this study was to investigate whether there is a difference in the value of certain
blood parameters in cows in the function of the level of fulfillment of the criteria and the
presence of certain indicators of well-being on the farm. Cows in which the farms are not fully
satisfied with the principles of the welfare of the metabolic status that indicates that they are
significant stress load (the higher the concentration of cortisol), take small amounts of food
(lower concentrations of glucose, urea calcium) and spend their own reserves to overcome
external factors (higher value of NEFA and BHB) and the maintenance of homeostasis. The
metabolic status of cows depends largely on the degree of satisfaction of the principle of the
welfare and the presence of indicators of stress and can be a quality indicator in assessing the
stress load of cows.Cilj ovog rada je da se ispita da li postoji razlika u vrednosti pojedinih
krvnih parametara kod krava u funkciji nivoa ispunjenosti kriterijuma i prisustva
odreÄenih indikatora dobrobiti na farmama. Krave kod kojih na farmama nisu u
dovoljnoj meri zadovoljeni principi dobrobiti imaju metaboliÄki status koji pokazuje da
su one znaÄajnije stresno optereÄenje (viÅ”a koncentracija kortizola), uzimaju manje
koliÄine hrane (niža koncentracija glukoze, uree u kalcijuma) i troÅ”e sopstvene rezerve
za savladavanje spoljaŔnjih faktora (viŔa vrednost NEFA i BHB) i održavanje
homeostaze. MetaboliÄki status krava u mnogome zavisi od stepena zadovoljenja
principa dobrobiti i prisustva indikatora stresa i može biti kvalitetan indikator u proceni
stresne optereÄenosti krava
Energetski status krava sa razliÄitim nivoom reproduktivne efikasnosti
Financial efficiency of dairy farms depends on the reproductive efficiency of cows on these
farms. Reproductive efficiency of cows on farms depends on the occurrence of postpartum
ovarian activity and the visible oestrus. Cows are in negative energy balance in early lactation.
We hypothesized that negative energy balance adversely affects the onset of postpartum
ovarian activity and occurrence of visible estrus. The pupils were 2 groups of cows: on the
basis of ovarian activity (cows that showed ovarian activity until 30 days after parturition, and
cows that ovarian activity showed later) and on the basis of visible postpartum estrus (cows that
have shown a clinically visible oestrus to 70 days after parturition, and cows that were first
estrus shown later). Performed to investigate the parameters of the metabolic profile in the first,
fourth and eighth week after parturition. Cows with higher quality reproductive efficiency have
lower concentrations of nonesterified fatty acids and ketones, and higher glucose concentration.
These results confirm that postpartum reproductive efficiency depends on the energy status of
cows. Number of days to starst of ovarial activity and days to firs visible oestrus negatively
corelated with glucose concentration and positively with value of NEFA and BHB.Reproduktivna efikasnost krava na farmama zavisi od nastanka postpartalne
ovarijalne aktivnosti i pojave vidljivih estrusa. Krave se nalaze u negativnom
energetskom bilansu u poÄetku laktacije. Predpostavili smo da negativni energetski
bilans negativno utiÄe na nastanak postpartalne ovarijane aktivnosti i nastanka vidljivog
estrusa. Formirane su 2 grupe krava: na osnovu ovarijalne aktivnosti (krave koje
pokazuju ovarijalnu aktivnost do 30. dana posle partusa i krave koje su ovarijalnu
aktivnost pokazale kasnije) i na osnovu vidljivog postpartalnog estrusa (krave koje su
pokazale kliniÄki vidljiv estrus do 70. dana posle partusa i krave koje su prvi estrus
pokazale kasnije). VrÅ”eno je ispitivanje parametara metaboliÄkog profila u prvoj,
Äetvrtoj i osmoj nedelji posle partusa. Krave sa kvalitetnijom reproduktivnom
efikasnoÅ”Äu imaju nižu koncentraciju neesterifikovanih masnih kiselina i ketona i viÅ”u
koncentaciju glukoze u prvoj i Äetvrtoj nedelji posle teljenja. NaÄena je pozitivna
korelacija izmeÄu vrednosti NEFA i BHB, a negativna korelacija glukoze i momenta
kada je zapoÄela ovarijalna aktivnost, odnosno kada je uoÄen prvi kliniÄki vidljiv estru