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1.
Prenova oskrbovanja montažnih linij
Dejan Martinc, 2019, magistrsko delo/naloga

Opis: V magistrskem delu smo analizirali oskrbovanje montažnih linij in samih delovnih mest s komponentami v opazovanem podjetju. Čeprav je obstoječ način oskrbovanja zanesljiv, pa ni najboljši, saj ima kar nekaj pomanjkljivosti. Skladiščni transporterji, kateri montažne linije oskrbujejo z viličarji, imajo delež pripeljanih logističnih enot na vožnjo dokaj majhen. To posledično pomeni veliko število voženj, visoko potrebo po viličarjih in visoke stroške. Linijski transporterji, ki s komponentami oskrbujejo delovna mesta, pri tem naredijo veliko nepotrebnih korakov in prelaganj logističnih enot. Te bi v primeru bolj povezanega dela med linijskimi in skladiščnimi transporterji lahko v veliki meri odpravili. V magistrskem delu smo našli rešitev izboljšanja obstoječega načina oskrbovanja in sicer s spremembo postavitve delovnih mest na samih montažnih linijah in z vpeljavo metode milk run. Metoda milk run je omogočila, da se je število pripeljanih logističnih enot na enoto vožnje povečalo, s tem pa se je zmanjšalo število voženj, potrebnih za oskrbovanje montažnih linij. S spremembo delovnih mest, ki so po novem postavljena tik ob transportnih poteh, smo omogočili, da se komponente z vlakci milk run dostavljajo bliže delovnim mestom oziroma kar na sama delovna mesta, kar olajšuje delo linijskih transporterjev.
Ključne besede: montažna linija, oskrbovanje, transporterji, milk run, materialni tok
Objavljeno: 13.01.2020; Ogledov: 375; Prenosov: 53
.pdf Celotno besedilo (2,77 MB)

2.
Nanoliposome encapsulation with donkey milk bioactive proteins and its possible application in dermatology and cosmetics
Hristina Kocić, Milica Stanković, Ivana Arsić, 2017, izvirni znanstveni članek

Opis: Nanoliposomes represent natural or synthetic nanoparticles made of phospholipids, which may spontaneously aggregate in an aqueous medium. Their use in dermatology and for cosmetic purposes may offer facilitated delivery in skin via enhanced opening of the tight junctions between the epithelial cell monolayers. As far as their use in dermatology is concerned, both transdermal and local application may offer successful release profile. Donkey milk may have special therapeutic properties when used in cosmetology for skin treatment. The aim of our study was to establish encapsulation efficacy of nanoliposome loaded with skimmed donkey milk and to explore the efficiency of encapsulation of different skimmed donkey milk concentrations in nanoliposomes. In our experimental study, it was documented that 1%, 2% and 5% solutions of skimmed donkey milk were almost equally effectively encapsulated, more than 80% in 1% solution of nanoliposomes, while 10% solution of skimmed donkey milk was encapsulated more efficiently, with 88.9% in 1% of nanoliposome solution. Encapsulation can lead to greater efficiency by enabling the use of lower administration doses and preventing the corresponding side effects, which may be the result of higher doses. Skimmed donkey milk is a suitable encapsulation solution.
Ključne besede: nanoliposomes, donkey milk, encapsulation efficacy
Objavljeno: 07.05.2018; Ogledov: 676; Prenosov: 255
.pdf Celotno besedilo (398,24 KB)
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3.
A new somatic cell count index to more accurately predict milk yield losses
Janez Jeretina, Dejan Škorjanc, Drago Babnik, 2017, izvirni znanstveni članek

Opis: Intramammary infection and clinical mastitis in dairy cows leads to considerable economic losses for farmers. The somatic cell concentration in cow's milk has been shown to be an excellent indicator for the prevalence of subclinical mastitis. In this study, a new somatic cell count index (SCCI) was proposed for the accurate prediction of milk yield losses caused by elevated somatic cell count (SCC). In all, 97238 lactations (55207 Holstein cows) from 2328 herds were recorded between 2010 and 2014 under different scenarios (high and low levels of SCC, four lactation stages, different milk yield intensities, and parities (1, 2, and _>3). The standard shape of the curve for SCC was determined using completed standard lactations of healthy cows. The SCCI was defined as the sum of the differences between the measured interpolated values of the natural logarithm of SCC (ln(SCC)) and the values for the standard shape of the curve for SCC for a particular period, divided by the total area enclosed by the standard curve and upper limit of ln(SCC)=10 for SCC. The phenotypic potential of milk yield (305-day milk yield - MY305) was calculated using regression coefficients estimated from the linear regression model for parity and breeding values of cows for milk yield. The extent of daily milk yield loss caused by increased SCC was found to be mainly related to the early stage of lactation. Depending on the possible scenarios, the estimated milk yield loss from MY305 for primiparous cows was at least 0.8 to 0.9 kg day -1 and for multiparous cows it ranged from 1.3 to 4.3 kg day-1. Thus, the SCCI was a suitable indicator for estimating daily milk yield losses associated with increased SCC and might provide farmers reliable information to take appropriate measures for ensuring good health of cows and reducing milk yield losses at the herd level.
Ključne besede: dairy cows, milk production, lactation intervals, milk yield losses, somatic cell count index
Objavljeno: 24.10.2017; Ogledov: 801; Prenosov: 390
.pdf Celotno besedilo (317,33 KB)
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4.
Prediction of standard lactation curves for primiparous Holstein cows by using corrected regression models
Janez Jeretina, Drago Babnik, Dejan Škorjanc, 2015, izvirni znanstveni članek

Opis: Prediction of the expected milk yield is important for the management of the primiparous cows (PPC) with a few or no data on their own milk productivity. We developed a system of regression equations for predicting milk yields in standard lactation. The models include the systematic effects of the calving season, the five-year rolling herd average of milk yield of PPC, the breeding values of the parents for milk production, and daily milk recordings. A total of 21,901 lactations of Holstein PPC were collected during the regular monthly milk recordings of cows in the Republic of Slovenia. By including daily milk recordings in the model, the coefficients of determination of regression models for the prediction of milk yield increase: without known recordings (M0) R 2 =0.80; with one recording (M1) R 2 =0.82; with two first consecutive recordings (M2) R 2 =0.86; and with three recordings (M3) R 2 =0.89. Deviations of milk yield up to 500 kg in a standard lactation (<1.6 kg/day) were as follows: with the model M0, they occurred in 53.4% of PPC; with M1, they occurred in 56.3% of PPC; with M2, they occurred in 64.5% of PPC; and with M3, they occurred in 70.9% of PPC. We concluded that the developed system of regression models is an appropriate method for milk yield prediction of PPC.
Ključne besede: primiparous cows, milk yield, prediction, lactation curves, regression equations
Objavljeno: 24.07.2017; Ogledov: 640; Prenosov: 389
.pdf Celotno besedilo (497,85 KB)
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5.
The milk quality and feasibility analysis of loose housing dairy cows
Marjan Janžekovič, Črtomir Rozman, 2006, izvirni znanstveni članek

Opis: The aim of the study was technological and economical analysis of free range cow breeding. The case study analyzed two different systems of holstein-fresian dairy cows breeding. The model total costs enterprise budget was developed for evaluation of economic feasibility of loose housing dairy cows in comparison with tied cow breeding system. Computer supported calculation enabled estimation of the most important economical parameters (net return, observed input parameters) loose housing system is economically feasible, if there is a minimum of 41 dairy cows with an average milk production of 8610 kg per cow. It was also established that cows need approximately 6 months to fully adapt to the loose hausing system.
Ključne besede: loose housing, dairy cows, milk quality, coefficient of economy
Objavljeno: 10.07.2017; Ogledov: 589; Prenosov: 80
.pdf Celotno besedilo (221,55 KB)
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6.
The Influence of various origins of first calving Simmental and Black-White cows on production and content of milk
Marjan Janžekovič, Dejan Škorjanc, Jože Smolinger, 2004, izvirni znanstveni članek

Opis: A total of 1 070 Simmental and Black-White first calving cows and the same number of mother cows were investigated. The first calving cows originally arrived from Slovenia, the Netherlands, Germany and Denmark. No statistically significant differences were established in the milk production and quality of milk between the first calving cows from abroad compared to the first calving Slovenian cows. Statistically significant higher milk production (8 004 ± 981 kg; P ≤0.001) had mother cows of the imported Black-White compared to the Slovene (6 514 ± 1 142 kg) ones. There were no statistically significant differences, in the milk production and quality of milk, between the imported mothers of first calving cows of Simmental breed comparing with Slovenian mothers of first calving cows of the same breed. The milk production between the mothers and their Simmental daughters had a statistically significant correlation (rp = 0.125; P ≤ 0.01). The higher correlation coefficient for this characteristic was established between the Black-White mothers and their daughters (rp = 0.302; P ≤ 0.001). Among the milk production of first calving cows and protein content in milk a statistically negative significant correlation (rp = -0.198; P ≤ 0.001) was established. This result confirmed that the purchase of more expensive animals with better genetic potential is economically unjustified for the breeder who does not reach intensive technology of basic quality voluminous fodder.
Ključne besede: cattle, Simmental, Black-White, milk production, protein, fat
Objavljeno: 10.07.2017; Ogledov: 480; Prenosov: 66
.pdf Celotno besedilo (225,07 KB)
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7.
The economic viability of value-based food chain for dairy farms in mountain regions
Jernej Prišenk, Andreja Borec, Marjan Janžekovič, Ivo Grgić, Karmen Pažek, Črtomir Rozman, Jernej Turk, 2016, izvirni znanstveni članek

Opis: The attention of this paper is drawn to analyze the economic potential of involvement of farmers into the small-medium sized value-based food chain (VBFC). The survey represents a solid data basis from which econometric modelling approach was further developed. Empirical results reveal the positive economic viability on a general level; this means more stable purchase price of raw milk for dairy farms, which are the part of value-based food chain. Results point at inelastic demand for milk and milk related products. Furthermore, there are some accompanying and underlying indirect social benefits, such as production of high-quality food products, more stable and constant demand for raw milk, steady payments and better social situation. The last one is especially important for the farms operating in less-favored mountain areas where the survey was actually conducted.
Ključne besede: mountain dairy farms, demand for milk, Value-based food chain, econometric modelling
Objavljeno: 10.07.2017; Ogledov: 464; Prenosov: 69
.pdf Celotno besedilo (272,24 KB)
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8.
Quality and delivery of milk in Slovenia
Marjan Janžekovič, Maksimiljan Brus, Lidija Mužerlin, 2007, izvirni znanstveni članek

Opis: Milk production represents the possibility of earning monthly income and assures social security to many farms in Slovenia. In Slovenia the European rules and regulations on the quality of the delivered milk have been introduced, relating to the hygienic quality of milk and the count of somatic cells. The purchase price of the milk depends also on the protein and fat content. The aim of the research was to establish, whether the quality of the delivered milk complies with the prescriptions regulated by the Slovene legislation. The quality of the delivered milk in the area of the Šentjur agricultural cooperative (ACŠ) and in the entire area of Slovenia (SLO) has been studied. The bacteriological data in the individual quality classes, the data on the total count of somatic cels and the data on the fat and protein contents have been analyzed. 36 monthly accounts have been included in statistical processing. It has been established that the delivered milk of the areas in question does not differ in the relevant quality values.
Ključne besede: cattle, milk quality, fats, proteins, micro-organisms, somatic cells
Objavljeno: 10.07.2017; Ogledov: 507; Prenosov: 89
.pdf Celotno besedilo (337,54 KB)
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9.
Multi-criteria and econometric evaluation of dairy products
Karmen Pažek, Jernej Turk, Sebjan Hari, Črtomir Rozman, Jernej Prišenk, 2014, izvirni znanstveni članek

Opis: This study examined the multi-criteria assessment of four dairy products: "Pomursko mlejko" (Pomurje milk), "Lejko mleko" (light milk), "Fyto mleko" (Fyto milk) and "Posneto mleko v prahu" (dried milk). The research was executed by using a multi-criteria methodology, DEX, which was complemented by an econometric analysis for light milk to estimate the trends in production and consumption before analyzed dairy products were implemented on the market. DEXi computer program results indicated that all analyzed milk products were 'above average'. The econometric model was applied to examine changes in the demand for low-fat milk (light milk). Empirical results showed significant consumer response to the increase in the prices of low-fat milk demonstrating income elasticity (1,15 unit).
Ključne besede: multi-attribute decision theory, DEXi, econometric analysis, milk products
Objavljeno: 10.07.2017; Ogledov: 640; Prenosov: 79
.pdf Celotno besedilo (636,19 KB)
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10.
Effect size measurement in functional milk product marketing
Karmen Pažek, Črtomir Rozman, Jernej Turk, Darja Majkovič, Sebjan Hari, Matej Kolenko, Sašo Pamič, Jernej Prišenk, 2011, izvirni znanstveni članek

Opis: The paper presents the application possibility of "Effect size" and Cohen's-d index in the case of introduction of new milk products on the market. The field and online survey were used to establish the potential interest of finalconsumers for new functional food product of dairy company in Slovenia - milk with phytosterols additives. Two techniques possibilities of Cohen-d index were calculated; manual and using the Cohen's-d calculator. Further, the application is focused on two main questions in survey regarding observed problem: 1) Would you buy milk with phytosterols additives, which scientifically proven lowers concentration of cholesterol in blood? 2) Would you pay for it at a higher price? The sample includes 419 surveys, 150 surveyswere conducted on field (control group) and 269 surveys were provided online (experimental group). The Cohenćs-d index (d) results show by using manual and Cohen's-d calculator for both groups "small" effect (d=0.35, i.e. d=0.34 ), and "zero or near zero" effect (d=0.15, i.e.= 0.15) when deciding to buy new milk product.
Ključne besede: effect size, Cohen`s-d index, functional food, milk
Objavljeno: 10.07.2017; Ogledov: 616; Prenosov: 104
.pdf Celotno besedilo (804,43 KB)
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