Povezanost broja somatskih stanica s proizvodnjom i kemijskim sastavom mlijeka Alpina koza

master's thesis

• Title (english): Realtionship between the somatic cell count and the production and chemical composition of Alpine goat milk
• Author: Karla Jotić
• Mentor: Zvonimir Prpić (mentor)
• Committee member: Zvonimir Prpić (predsjednik povjerenstva)
• Committee member: Antun Kostelić (član povjerenstva)
• Committee member: Ivan Vnučec (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Animal Science and Technology); Zagreb
• Defense date and country: 2021-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Cilj rada bio je utvrditi povezanost broja somatskih stanica s dnevnom proizvodnjom i
kemijskim sastavom mlijeka alpina koza. Istraživanjem je obuhvaćeno stado od 80 strojno
muzenih alpina koza na području Međimurske županije u kojem su sva grla držana u
identičnim uvjetima smještaja i hranidbe. Tijekom istraživanog razdoblja mužnje (od odbića
do zasušenja koza) redovito (jednom mjesečno, svakih 28-34 dana) je provođena kontrola
mliječnosti (AT metoda) svih grla koja je obuhvaćala mjerenje količine pomuzenog mlijeka, kao
i redovito mjesečno uzimanje po jednog uzorka mlijeka od svakog grla (iz cijelog vimena) u
svrhu određivanja njegovog kemijskog sastava (udio suhe tvari, bezmasne suhe tvari, mliječne
masti, bjelančevina i laktoze) i broja somatskih stanica (BSS) u mlijeku. Ukupno je prikupljeno
i analizirano 613 pojedinačnih uzoraka kozjeg mlijeka. Aritmetička srednja vrijednost BSS svih
analiziranih uzoraka mlijeka iznosila je 1.401x103/mL, dok je geometrijska srednja vrijednost
BSS bila 602x103/mL (5,78 log10BSS). Utvrđen je statistički značajan utjecaj laktacijske
proizvodnje mlijeka na BSS u mlijeku alpina koza. U alpina koza u čijim je uzorcima mlijeka
utvrđeno manje od 500.000 somatskih stanica/mL, utvrđena je najveća prosječna dnevna
proizvodnja mlijeka, ali ujedno i najsiromašniji prosječni kemijski sastav mlijeka. Utvrđene su
statistički značajne i negativne korelacije između BSS i proizvodnje mlijeka (dnevne i
laktacijske), odnosno postojanje značajnih negativnih korelacija između BSS i sadržaja suhe
tvari, mliječne masti i bjelančevina u mlijeku.

Abstract (english)

The aim of this study was to determine the relationship between the somatic cell count and
the daily production, and chemical composition of alpine goat milk. The research included a
herd of 80 machine - milked alpine goats in the area of Međimurje County, in which all heads
were kept under identical conditions of accommodation and feeding. During the milking
period (from weaning to drying of goats) all goats were regularly (once a month, every 28-34
days) subjected to milk control (AT method) which included measuring the amount of milk, as
well as regular monthly sampling of milk from each goat (one sample of milk from the whole
udder) for the purpose of determining its chemical composition (dry matter content, non-fat
dry matter, milk fat, protein and lactose) and the number of somatic cells (SCC) in the milk. A
total of 613 individual goat milk samples were collected and analyzed. The arithmetic mean
SCC of all analyzed milk samples was 1,401x103/mL, while the geometric mean SCC was
602x103/mL (5,78 log10BSS). A statistically significant effect of lactation milk production on
SCC in alpine goat milk was found. In alpine goats with less than 500.000 somatic cells/mL in
milk samples, the highest average daily milk production was found, which was also of poorer
average chemical composition. Statistically significant and negative correlations were found
between SCC and milk production (daily and lactation), that is the existence of significant
negative correlations between SCC and the content of dry matter, milk fat and protein in milk.

• Keywords: kozje mlijeko; somatske stanice; proizvodnja mlijeka; kemijski sastav mlijeka
• Keywords (english): goat milk; somatic cells; milk production; milk chemical composition
• Language: croatian
• URN:NBN: urn:nbn:hr:204:683937
• Study programme: Title: Production and Processing of Milk; Study programme type: university; Study level: graduate; Academic / professional title: magistar / magistra inženjer/inženjerka proizvodnje i prerade mlijeka (magistar / magistra inženjer/inženjerka proizvodnje i prerade mlijeka)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2021-11-17 10:17:08