Ocena koagulacijskih lastnosti mleka drežniške koze : diplomsko delo

Uršič, Vid (author), Simčič, Mojca (mentor), Treven, Primož (comentor)

Edina avtohtona pasma koz v Sloveniji, drežniška koza, je dobro prilagojena na zahtevne pogoje reje v visokogorju. Namen diplomske naloge je bila ocena koagulacijskih lastnosti mleka drežniških koz ter primerjava teh rezultatov z že objavljenimi rezultati za slovensko srnasto kozo. V poskus je bilo vključenih 95 koz treh rejcev iz Zgornjega Posočja. Vzorci mleka so bili pridobljeni ob treh zaporednih kontrolah mlečnosti v letu 2026, analize koagulacijskih lastnosti so bile narejene z instrumentom Computerized Renneting Meter. Analizirani so bili čas začetka koagulacije (r), hitrost koagulacije (k20) in čvrstost koaguluma po 15, 20 in 30 minutah (a15, a20, a30). Povprečni čas začetka koagulacije je bil 7,86 min, hitrost koagulacije 2,57 min, čvrstost koaguluma po 15 minutah je bila 21,77 mm, po 20 minutah je bila 29,10 mm in po 30 minutah 30,49 mm. Na večino koagulacijskih lastnosti sta statistično značilno vplivala rejec in zaporedna kontrola mlečnosti, na nekatere koagulacijske lastnosti je statistično značilno vplivala tudi vsebnost maščobe v mleku. Hipotezo, da bo imela drežniška koza boljše koagulacijske lastnosti mleka v primerjavi s slovensko srnasto kozo lahko le delno potrdimo, saj sta bila boljša le čas začetka koagulacije (r) in hitrost koagulacije (k20).

• Language: Slovenian
• Keywords: koze, avtohtone pasme, drežniška koza, mleko, koagulacijske lastnosti, diplomska dela
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Place of publishing: Ljubljana
• Publisher: V. Uršič
• Year: 2026
• Number of pages: 1 spletni vir (1 datoteka PDF (VIII, [20] str.))
• PID: 20.500.12556/RUL-188059
• UDC: 636.3:637.1(043.2)
• COBISS.SI-ID: 291643907
• Publication date in RUL: 18.09.2026

Secondary language

• Language: English
• Title: Assessment of the milk coagulation properties of the Drežnica goat : B. Sc. thesis

Abstract

Drežnica goat, the only indigenous goat breed in Slovenia, is well adapted to the demanding conditions of high-altitude farming. The aim of this study was to evaluate the coagulation properties of milk from Drežnica goat and to compare the results with previously published results for the Slovenian Alpine goat. All together 95 goats from three breeders in the Upper Soča Valley were included in the research. Milk samples were collected during three consecutive milk recordings in the year 2026, and coagulation properties were analysed using a Computerized Renneting Meter. The analysed parameters included rennet coagulation time (r), curd firming rate (k20), and curd firmness after 15, 20, and 30 minutes (a15, a20, and a30). The average rennet coagulation time was 7.86 min, the curd firming rate was 2.57 min, and curd firmness after 15, 20, and 30 minutes was 21.77 mm, 29.10 mm, and 30.49 mm, respectively. Breeder and consecutive milk recording had a significant effect on most coagulation properties, while fat content also affected some traits. The hypothesis that milk from the Drežnica goat breed would have better coagulation properties of milk compared to Slovenian Alpine goat could only be partially confirmed, as only the rennet coagulation time (r) and curd firming rate (k20) were better.

• Keywords: goats, indigenous breeds, Drežnica goat, milk, coagulation properties