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2013, vol. 63, br. 4, str. 385-396
Nivo insulina, insulinu sličnog faktora rasta-I i tireoidnih hormona u odnosu na promene telesne kondicije (OTK) u peripartalnom periodu kod krava
aUniverzitet u Beogradu, Fakultet veterinarske medicine
bVeterinary station Đuravet, Leskovac
cVeterinary specialistic Institute, Niš
dUniverzitet u Kragujevcu, Agronomski fakultet, Čačak
Projekat:
Molekularno-genetička i ekofiziološka istraživanja u zaštiti autohtonih animalnih genetičkih resursa, očuvanju dobrobiti, zdravlja i reprodukcije gajenih životinja i proizvodnji bezbedne hrane (MPNTR - 46002)
Razvoj tehnologija i proizvoda na bazi mineralnih sirovina i otpadne biomase u cilju zaštite resursa za proizvodnju bezbedne hrane (MPNTR - 31003)

Sažetak
Cilj ovog rada je bio da se odredi nivo insulina, insulinu sličnog faktora rasta IGF-I, trijodtironina (T3) i tiroksina (T4) u krvi u odnosu na promene telesne kondicije kod krava u peripartalnom periodu. Za ogled je odabrano 20 krava holštajn - frizijske rase između 2-4 laktacije i čija je proizvodnja mleka u predhodnoj laktaciji iznosila 7000 L za 305 dana. Telesna kondicija (OTK) je kod svih krava određivana na početku zasušenja, 7±3 dana pre i 7±3 posle teljenja. Na osnovu OTK na početku zasušenja, krave su bile podeljene u dve grupe: krave sa visokom OTK (3,75-4,25, n=10) i krave sa optimalnom OTK (2,75-3,75, n=10). Uzorci krvi su prikupljani u vreme određivanja OTK. Koncentracija insulina, IGF-I, trijodtironina (T3) i tiroksina (T4) određivana je RIA metodom (INEP-Zemun, Serbia). Statistička značajnost razlika između srednjih vrednosti procenjivana je Studentovim ttestom. Srednje vrednosti OTK u ranom periodu zasušenja bile su statistički značajno različite u odnosu na druga dva perioda (p<0,01) kod obe grupe, ali je OTK kod obe grupe bila slična 7±3 posle teljenja (2,69±0,67:2,62±0,27, p>0,05). Koncentracija IGF-I bila je statistički značajno viša kod krava sa visokom OTK, 7±3 dana pre teljenja (16,28±3,07:11,76±2,28, p<0,01), sa obrnutim odnosom 7±3 dana posle teljenja (3,77±1,64:8,46±2,37, p<0,01). Koncentracija insulina je bila značajno niža 7±3 dana pre teljenja kod krava sa visokom OTK (16,26±4,60:20,18±4,96 mIU/L, p<0,05). Nivo tireoidnih hormona je bio značajno niži kod krava sa visokom OTK u svim ispitivanim periodima.
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