20.500.12556/RUL-162531 Vpliv sezone telitve na potek laktacijske krivulje krav molznic The effect of calving season on lactation curve characteristics in dairy cows V nalogi smo preučevali vpliv sezone telitve na potek laktacijske krivulje krav molznic. Ne le sezona telitve, temveč tudi dolžina dneva, prehrana, zdravstveno stanje, starost ob prvi telitvi, frekvenca molže in pasma pomembno vplivajo na potek laktacijske krivulje. V nalogo smo vključili pregled podatkov, ki smo jih pridobili iz Centralne podatkovne zbirke GOVEDO za obdobje med letoma 2010 in 2022 za molznice rjave, lisaste in črno-bele pasme, vključene v kontrolo. Mlečno vztrajnost smo izrazili s perzistenčnima indeksoma P2:1 in P3:1 in ju prikazali po pasmah za prvesnice in krave po posameznih mesecih telitve. Laktacije, ki se začnejo jeseni in pozimi, imajo praviloma najboljšo mlečno vztrajnost. Molznice, ki so telile jeseni (septembra in oktobra), so imele najboljšo mlečno vztrajnost, najslabšo pa tiste, ki so telile spomladi. Krave in prvesnice črno-bele pasme so imele boljšo mlečno vztrajnost kot krave in prvesnice rjave ter lisaste pasme. Pri vseh treh pasmah so imele prvesnice boljšo mlečno vztrajnost v primerjavi s kravami. In this thesis we were studying the effect on the course of the lactation curve in dairy cows. Not only calving season but also day length, nutrition, health status, age at first calving, milking frequency and breed have a significant influence on the lactation curve. We have also included in this thesis a review of data obtained from the Central Cattle Database for the period 2010-2022 for Brown Swiss, Simmental and Holstein dairy cows included in the milk recording. Milk persistency was expressed by persistency index P2:1 and P3:1 and reported for primiparous and multiparous cows of different breeds by months of calving. Lactations starting in autumn and winter have usually the best milk persistency. Cows calving in autumn (September, October) had the best milk persistency, while cows calving in spring had the worst. Holstein cows had better milk persistency than Brown Swiss and Simmental cows and heifers. In all three breeds, primiparous cows had better milk persistency compared to multiparous cows. govedo krave molznice sezona telitve laktacijska krivulja Slovenija cattle dairy cows calving season lactation curve Slovenia true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-09-25 07:17:36 2024-09-25 07:17:39 2024-10-03 14:34:29 0000-00-00 00:00:00 2024 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 246776 210130691 44228.pdf 44228.pdf 1 42A31F1EF2B82660CFAF5EA4C3C7A301 c84adffa0dd5466e031821300c3feb345473772d55c58f9cd7edfb939bdd0aa3 5da3810c-7afd-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=191876 Biotehniška fakulteta 0 0 0