20.500.12556/DKUM-39656 VPLIV SESTAVE OBROKA ZA KRAVE MOLZNICE NA RAZMERJE MED MAŠČOBO IN BELJAKOVINAMI V MLEKU The influence of the composition of feed of dairy cows on the ratio of fat to protein in milk V letu 2010 smo v čredi krav na gorski kmetiji ugotavljali vpliv sestave poletnega in zimskega obroka, s katerim so bile krave krmljene, na kakovost mleka. Namen naloge je bil ugotoviti oskrbljenost krav s poglavitnimi hranilnimi snovmi glede na kakovost mleka, ki smo jo ugotovili z analizo mleka na kmetiji. Analizirali smo zimski in poletni obrok in ugotovili, da v obeh obrokih primanjkuje razgradljivih beljakovin, ki so potrebne za sintezo mikrobnih beljakovin v vampu in posledično za prebavljivost krme. Razmerje M/B v mleku je bilo precej raznoliko, a zaželeno je čim bolj konstantno razmerje. V poletnem obroku se je razmerje gibalo med 1,2 in 1,3, vendar se je v jesenskih mesecih zožilo pod 1,1. Vsebnost maščob je s pašo upadla pod 4 % in je bila v poletnem obdobju zelo raznolika. Prav tako je upadla vsebnost beljakovin pod 3,2 %, kajti s poletno krmo je težje zagotoviti potrebe po energiji. V zimskem obdobju se je razmerje M/B gibalo med 1,1 in 1,35. Vsebnost maščob se je gibala med 4 in 4,5 %, kar kaže na dovolj vlaknine v obroku. Vsebnost beljakovin je bila januarja 3,56 % in je nato upadala zaradi preskromne oskrbe z energijo, potrebno za sintezo mikrobnih beljakovin v vampu. The aim of the study was to find out the influence of the composition of summer and winter feed of dairy cows on the quality of cow milk. The research took place on a mountain farm in 2010. The present thesis objective was to determine the core nutrients supply in the feed of dairy cows, according to the quality of milk, proven by the analysis of the milk at the farm. The analysis both of the winter and the summer feed has proven a deficiency of degradable proteins which are necessary for the microbial protein synthesis in the rumen and the digestibility of feed. The ratio of fat to protein (F/P) in milk was relatively changeable, although the constant ratio values are preferable. In the summer feed the ratio was between 1.2 and 1.3, but in the months of autumn it has fallen under 1.1. Fat content was decreased below 4 % due to the grassland pasture and has been very diverse in the summer period. The protein content was low as well - below the 3.2 %, due to the fact it is more difficult to provide sufficient energy source in the summer feed. In the winter period, the ratio values of F/P were between 1.1 and 1.35. Fat was ranging between 4 and 4.5 %, which is suggesting sufficient fibre content in the feed. The protein content has been in decline after January result of 3.56 %, due to the insufficient energy supply, needed for the synthesis of microbial protein in the rumen. krave molznice prehrana mleko beljakovine maščobe dairy cows nutrition milk protein fat true true false Slovenski jezik Angleški jezik Diplomsko delo 2013-02-13 10:58:01 2013-02-25 09:58:31 2022-05-12 23:07:18 2021-04-22 03:31:29 2013 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 URN:SI:UM:DK:BRZICZJU VS_Skarlovnik_Blaz_2013.pdf VS_Skarlovnik_Blaz_2013.pdf 1 300F8305F934C26F46CB26F45EA45DA3 942b09655374a21f07c112c7f3da9dde009ea5806d00f0ec6e1d75394ceca4c6 2dbb9a1a-7c09-11eb-bb7a-00155d0001ca 20.500.12556/dkum/0772f8c6-e149-4c7e-8a0b-d7d422ff229d https://dk.um.si/Dokument.php?lang=slv&id=53748 Fakulteta za kmetijstvo in biosistemske vede 0 0 0