Vpliv sistema reje na raven oksitocina in kortizola v kozjem mleku

Peretin, Maja (avtor), Zupan, Manja (mentor), Čebulj Kadunc, Nina (komentor)

Namen diplomskega dela je bil raziskati, kako sistem reje in način odvzema mleka vplivata na koncentracijo oksitocina in kortizola v kozjem mleku. V raziskavo smo vključili 20 koz slovenske srnaste pasme, ki jih redijo v PRC Logatec, kjer je poskus potekal. Vzeli smo 10 koz iz ekološke in 10 iz konvencionalne reje. Posamezna koza je bila vključena v poskus štiri zaporedne tedne. Vsak teden smo odvzeli po dva vzorca mleka – med molžo in med sesanjem, tako, da smo ob zaključku poskusa imeli po 8 vzorcev mleka na kozo, 4 vzorce odvzete med molžo in 4 med sesanjem. Vsebnost kortizola in oksitocina v vzorcih mleka so izmerili na Veterinarski fakulteti v Ljubljani. Rezultati so pokazali, da so koze iz ekološke reje »srečnejše«, saj so v povprečju imele višje koncentracije oksitocina in nižje koncentracije kortizola v mleku, kar pomeni, da je ekološka reja za koze manj stresna kot konvencionalna. V nadaljevanju smo ugotovili, da predstavlja molža za koze večji stres kot sesanje, saj so bile vrednosti kortizola med sesanjem značilno nižje kot med molžo. Proti pričakovanjem pa je bila med molžo, v povprečju, tudi višja raven oksitocina v mleku, kar pa bi lahko pripisali enemu izmed glavnih sprožilcev »sreče« pri domačih živalih - krmi, ki je naznanjala začetek molže. Tudi kozliči koz, katerih raven oksitocina v mleku je bila višja in katerih raven kortizola je bila nižja, so priraščali hitreje – te rezultate smo dobili s podatki dnevnih prirastov, ki smo jih izračunali iz vmesnih tehtanj. Ugotovili smo tudi, da na raven oksitocina in kortizola v mleku statistično značilno vpliva tudi število somatskih celic v mleku, zaporedna laktacija in število kozličev na kozo.

• Jezik: Slovenski jezik
• Ključne besede: koze, reja, sistemi reje, mleko, oksitocin, kortizol
• Vrsta gradiva: Diplomsko delo/naloga
• Organizacija: BF - Biotehniška fakulteta
• Leto izida: 2018
• PID: 20.500.12556/RUL-101909
• COBISS.SI-ID: 4104840
• Datum objave v RUL: 13.07.2018

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: The ǂinfluence of the farming method on levels of oxytocine and cortisol in goats milk

Izvleček

The aim of B. Sc Thesis was to investigate how the farming method and the method of taking milk from the Alpine goats, affects the milk oxytocin and cortisol concentrations. There were 20 Alpine goats included in our study, from which there were 10 from organic and 10 from conventional farming. The goats were located at PRC (Pedagogical Research Centre) Logatec. Each goat participated in the study for 4 consecutive weeks; each week we took two samples from each individual. We therefore had 8 samples per goat– 4 taken during milking and 4 during suckling. The measurements were taken at the Veterinary Faculty in Ljubljana. Our results showed that goats from the organic farming are »happier« and under less stress, based on a higher oxytocin concentrations and lower cortisol concentrations, compared to the conventional farming. Milking caused higher stress response in goats than suckling with cortisol concentrations being significantly higher. In contrary to our expectations, the oxytocin concentrations during milking were higher than during suckling. This phenomenon could be explained with the »main source of happiness« in domestic animals – food, which may represent the trigger before milking started. The kids of goats, which had higher levels of oxytocin and lower levels of cortisol grew faster than kids of goats with reverse values – calculated from daily gain, which was calculated from the intermediate weighing. There were additional factors that influenced the milk hormonal concentrations, such as: the number of somatic cells, the successive lactation and the number of kids per goat.

• Ključne besede: goats, breeding, farming systems, milk, oxytocin, cortisol