Kemijski sastav mlijeka, omjer mliječne masti i bjelančevina krava holštajnske pasmine u odnosu na proizvedenu količinu mlijeka

master's thesis

• Title (english): Chemical Composition of Milk, Milk Fat Ratio and Protein of Holstein Cows in Relation to Milk Production
• Author: Ana Zupčić
• Mentor: Marko Samardžija (mentor)
• Mentor: Dražen Đuričić (mentor)
• Committee member: Ivan Folnožić (predsjednik povjerenstva)
• Committee member: Marko Samardžija (član povjerenstva)
• Committee member: Dražen Đuričić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Veterinary Medicine; (Reproduction and Obstetrics Clinic); Zagreb
• Defense date and country: 2020-02-24, Croatia
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Veterinary Medicine; Veterinary Clinical Sciences

Abstract

Kemijski sastav mlijeka je veoma složena i promjenjiva veličina na koju utječe čitav niz čimbenika poput poput dobi životinje, pasmine, individualnih osobina jedinke, stadija laktacije, načina hranidbe, zdravstvenog stanja krava i zdravstvenog stanja mliječne žlijezde. Svrha ovog istraživanja bila je ustvrditi korelaciju između proizvedene količine mlijeka i kemijskog sastava mlijeka te omjera mliječne masti i bjelančevina krava holštajnske pasmine. Istraživanje je provedeno na kravama holštajnske pasmine u starosti od 2-5 godina. Krave su raspoređene u tri skupine prema dnevnoj prosječnoj količini proizvedenog mlijeka (DKM): skupina A krave <15 kg DKM (n=8), skupina B 15-25 kg DKM (n=8) i skupina C ≥25 kg DKM (n=8). Istraživani parametri su bili: mliječna mast, bjelančevine, laktoza i ureja te broj somatskih stanica. Statistički značajni parametri (P<0,050) bili su udio bjelančevina (%) i mliječne masti (%) između tri istraživane skupine životinja te ukupna količina mlijeka u 305 dana laktacije i prosječna dnevna količina mlijeka. Ovim istraživanjem došlo se do zaključka da što je veća proizvodnja mlijeka u 305 dana laktacije kao i prosječna dnevna količina mlijeka to su postotak mliječne masti i bjelančevina u ukupnom sastavu mlijeka manji.

Abstract (english)

Chemical composition of milk is complex and resizable, which is influenced by number of factors such as age of animal, breed, the individual characteristics of species, lactation stage, feeding regimes, health of the cows and their mammary gland. The purpose of this research was to determine the correlation between produced quantity of milk and chemical composition of milk in regard to the ratio of milk fat and protein of Holstein cows breed. The study was conducted on Holstein friesian cows in the age of 2-5 years. The cows were divided into three groups according to daily average volume of produced milk (DVM): group A cows <15 kg DVM (n=8), group B 15-25 kg DVM (n=8) and group C ≥25 kg DVM (n=8). The researched groups were milk fat, protein, lactose and urea and somatic cell count. Statistically significant parameters (p<0,050) are proportion of protein (%) and milk fat (%) among the three enquired groups of animals and the total amount of milk in 305 days of lactation and average daily milk volume. In conclusion of this study, with greater production, percentage of milk fat and protein in the overall composition of milk is less, and the total amount of milk in 305 days of lactation and daily average milk volume is higher.

• Keywords: holštajnska krava; mlijeko; kemijski sastav
• Keywords (english): Holstein friesian cow; milk; chemical composition
• Language: croatian
• URN:NBN: urn:nbn:hr:178:745130
• Study programme: Title: Veterinary Medicine; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: doktor/doktorica veterinarske medicine (doktor/doktorica veterinarske medicine)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2020-11-02 07:21:52