Analiza utjecaja fotoperioda i prolaktina na proizvodnju mlijeka i muzne karakteristike krava

master's thesis

• Title (english): Analysis of the influence of photoperiod and prolactin on milk production and milking characteristics of cows
• Author: Filip Pomper
• Mentor: Alen Džidić (mentor)
• Committee member: Alen Džidić (predsjednik povjerenstva)
• Committee member: Krešimir Salajpal (član povjerenstva)
• Committee member: Dragica Šalamon (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Animal Science I); Zagreb
• Defense date and country: 2022-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

U natrag nekoliko desetljeća napravljena su mnoga istraživanja na temu utjecaja svjetlosnog perioda na proizvodne karakteristike krava. Više od nekoliko njih ide u prilog da svjetlost itekako ima utjecaja na proizvodnju mlijeka, pravilnom manipulacijom stočari bi u teoriji mogli utjecati na količinu mlijeka. Ovim istraživanjem se pokušalo potvrditi brojne radove i prihvatiti alternativnu hipotezu o utjecaju svijetla na proizvodnju mlijeka, kao i ispitati muzne karakteristike krava koje su bile izložene periodu dugog dana u odnosu na krave izložene periodu kratkoga dana. Također, ispitivan je i direktan utjecaj prolaktina na proizvodnju mlijeka i muzne karakteristike krava. Ovim istraživačkim radom se zaključilo da svjetlosni period nema utjecaja na proizvodnju mlijeka, kao ni na muzne karakteristike krava. S druge strane otkriveno je da prolaktin ima značajan utjecaj na maksimalni protok mlijeka, ali ne i na prinos mlijeka i ostale ispitivane varijable.

Abstract (english)

In the past few decades, many studies have been done on the topic of the influence of the light period on the production characteristics of cows. More than a few of them are in favor of the fact that light does indeed have an effect on milk production, with proper manipulation, livestock farmers could in theory influence the amount of milk. This research attempted to confirm numerous works and accept an alternative hypothesis about the influence of light on milk production, as well as examine the milking characteristics of cows exposed to a long day period compared to cows exposed to a shorter day period. Also, the direct influence of prolactin on milk production and milking characteristics of cows was investigated. This research work concluded that the light period has no influence on milk production, as well as on the milking characteristics of cows. On the other hand, it was discovered that prolactin has a significant influence on the maximum milk flow, but not on the milk yield and other investigated variables.

• Keywords: svjetlosni period; svijetlo; prolaktin; proizvodnja mlijeka
• Keywords (english): light period; prolactin; milk production
• Language: croatian
• URN:NBN: urn:nbn:hr:204:003442
• Study programme: Title: Animal Genetics and Breeding; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka genetike i oplemenjivanja životinja (magistar/ magistra inženjer/inženjerka genetike i oplemenjivanja životinja)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-11-02 11:22:49