Janzekovic Marjan

• University of Maribor

The objective of this study was to investigate the effects of supplementation of hydrolyzable tannins (HT) from sweet chestnut wood extract (Castanea sativa Mill.) to the diet of Limousin bulls on growth rate, carcass and meat quality traits, and fecal Clostridia strain levels in a 7-month feeding trial. Thirty-two bulls were randomly assigned to f...

The study aims to identify any changes in the communication channels used by Slovenian livestock farmers before and during the COVID-19 pandemic, as well as the main (dis)advantages of relying on them. An online survey was completed by 502 Slovenian farmers of various farm enterprises in winter 2020/2021. Most respondents generally used telephone,...

In the recent years, numerous publications have analysed the efficiency of phytogenic feed additives, plant-based supplements, in animal nutrition for improving livestock productivity and the quality of products. Regarding ruminant nutrition, the publications very often focus on the fate of proteins and on productivity as a result of the use of tan...

Domestic mountain horse is a transpoundary breed present in many Balkan countries. According to the Low of Animal Production of R. of Macedonia from 2008, for every breed of domestic animal in our state is nessesery to create a separate breeding program. In 2013 in low of animal production the autohtonous breeds of equidaes are added two new variet...

The aim of this study is present the technology and economic viability calculation of rabbit meat production. The input data and results base on the real case (farm) from Slovenia. The priority of the farm is producing the rabbit meat for self-sufficient consumption instead of commercial approach. The economic calculations bases on data collected f...

The aim of this paper is to assess the economic aspects of bedding materials for sport/recreational horses. Four materials are tested: sawdust in bulk, wood shavings, squared harvest straw, and slice-dusted straw. The process of collecting data for feasibility analysis is structured into two different trials. In Trial 1, daily observations are coll...

Domestic donkey is a transboundary breed present in many Balkan countries. According to the Law on Animal Production, in many Balkan countries, for every breed of domestic animals it is necessary to create a separate breeding programme. Based on the results of a study evaluating the main morphological, reproductive and functional traits in 47 domes...

Through the research, four different materials have been tested: two types of sawdust (one in bulk and second is packaged), straw in bulk and slice-dusted straw. During the survey the measuring and collecting the everyday observations to get the data about capacity of eliminated materials and time to clean the stalls were carried out. Results show...

Hydrolysable tannins are polyphenolic secondary metabolites of plants, with a high bioactive function. A twelve-month feeding trial was conducted to determine the effect of the feed additive Farmatan-D® on average daily gain (ADG) of Simmental bulls. The feed supplement Farmatan-D® mainly consists of highly concentrated hydrolysable tannins, organi...

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...

Feeding costs represent an important parameter in the economics of cattle beef. In this paper we present a feeding ration optimisation model for simental bulls. The model is based upon calculation of component requirements with respect to expected daily gains and mathematical programming. The model is implemented in software What's best Industrial.

The objective of this study was to develop a model to assess economical and balanced feed rations for sport horses. It was based on nonparametric modelling with a combination of linear programming and a multiobjective optimization technique: weighted goal programming. The method incorporates multiple goals into optimization. The technical data pres...

In this paper, we examine different scenarios for appropriate environment regulation of degraded areas with silvopastoral system establishment using integrated computer-based deterministic simulation and a multi-criteria decision model. We test the possibility for the wild game farming of red deer (Cervus elaphus) and fallow deer (Dama dama) in the...

The objective of the present study was to determine diurnal variation of ammonia emission in pig fattening facilities. Measurements were carried in fattening period from 11 weeks of pigs' age to 26 weeks of pigs' age. The performance characteristics of daily gain, body weight and feed consumption were evaluated. In addition, excretory behaviour was...

The purpose of this research was to find out if raw milk in milk-dispensers comply qualitative standards for consumers. We analyzed fifty samples of raw milk for CNM (common number of microorganisms) and ten samples for SCC (somatic cell count) at delivery to and removal from milk-dispensers. We finished the chemical and microbiological analysis of...

A total of 240 fattening pigs ([landrace×large white]×pietren) housed in a pig research centre (Faculty of Agriculture and Life Science, University of Maribor) were used in a study of the effect of the ECHO monitoring system on controlling the microclimatic condition and gas emission rates in winter and summer. With the monitoring system, we were a...

Three agricultural implements (soil preparation machine, disk harrow and circular self-cleaning harrow) were used in four repetitions. The surface area of the field was 19530 m 2 and it was divided into twelve plots of 1627,5 m 2 each. The test was aimed at proving that time and fuel and, consequently, money can be saved, if new agricultural machin...

Purpose: of this paper: Heart rate is a reliable indicator of the stress. Non-invasive methods have advantage over the methods that have a negative influence on the condition of an animal. When breeding sport horses, which undergo stressful training every day, it is required, from an ethical aspect, to monitor their capabilities by using most advan...

Purpose: This research project was aimed at optimising anaerobic digestion of maize and find out which maturity class of corn and which hybrid of a particular maturity class produces the highest rate of biogas and biomethane. Also the chemical composition of gases was studied.Design/methodology/approach: Biogas and biomethane production and composi...

The aim of this research was to establish whether there are differences in the longevity and production characteristics within the studied breeds of cows of different origin. Holstein cows of Slovenian (461) and foreign (356) origin and Simmental cows of Slovenian (261) and foreign (43) origin were studied. Only culled animals that previously had b...

Purpose: The appearance western corn rootworm (Diabrotica virgifera LeConte) in Slovenia brings new challenges to machines used for pesticide spraying of corn. The control of western corn rootworm is difficult due to the height of the corn crop in July-August. The current paper presents the exploitation characteristics of mistblower with cannon and...

Purpose: of this paper is to compare mesophilic and thermophilic anaerobic digestion of three maize varieties. Parameters such as biogas production and biogas composition from maize silage were measured and calculated. The amount of biogas production (methane) was observed by the mini digester.Design/methodology/approach: Biogas production and comp...

Current agricultural practice favours winter cover crops, which can not only optimize N management in field crop rotation; but also affect subsequent crops. Three field experiments were carried out in Eastern Slovenia to examine the effects of Italian ryegrass (Lolium multiflorum Lam.), winter rape (Brassica napus ssp.oleifera (Metzg.) Sinsk), subc...

Purpose: The paper compares the effect of five different direct seeding methods to the conventional tillage on the emerging and yield of silage corn (Zea may L.) in two different pedo-ecological conditions of Slovenia.Design/methodology/approach: A randomly selected 4x6 block designed field test was carried out; gliphosat treatment 1 week before se...

Purpose: The aim of the paper is to present the construction of a mini digester for biogas production from different agriculture plant biomass and other organic wastes. The amount of biogas production (methane) is observed by the mini digester.Design/methodology/approach: The mini digester consisting of twelve units was built and some measurements...

Purpose: If measurements of the increased total count of somatic cells in the individual udder quarter or in the whole udder could be determined with electric conductivity by means of the microprocessor-controlled device Mastitron LF 3000 enough precisely to predict the presence of subclinical mastitis.Design/methodology/approach: The occurrence of...

Purpose: of this paper is to present the justification of replacement of the obsolete system for milk pasteurization and washing of the production line by the newer CIP system (cleaning in place) in the dairy. The latter ensures reliable washing and sterilization of lines and machines, which is one of the principal prerequisites for the product qua...

The purpose of the research was to establish the effect of concentrates A (C-A) and B (C-B) on the quantity and composition of the produced milk of dairy cows. The research included cows of Holstein Friesian and Simmental breeds and crossbreeds with Simmental breed. The test took place in two periods. The first period with the C-A lasted from Decem...

The aim of this research was to establish whether there are differences in the longevity and production characteristics within the studied breeds of cows of different origin. Holstein cows of Slovenian (461) and foreign (356) origin and Simmental cows of Slovenian (261) and foreign (43) origin were studied. Only culled animals that previously had b...

Purpose: The main target is to produce as much biogas as possible with highest possible biomethane content from crops representing the principal fuel for driving the gas motors and electric generators and, consequently, production of electricity.Design/methodology/approach: The biogas production was measured by a mini digester according to the Germ...

Purpose: of this paper is to present the construction of a mini digester for biogas production from different energy plants and organic wastes. With the mini digester the amount of biogas production (methane) is observed.Design/methodology/approach: Firstly, the mini digester consisting of twelve units was built and secondly some measurements with...

Purpose: The purpose of this paper is to study the influence of new equipment on the effect of pasteurization in the department for pasteurization. The total bacterial count (TBC) in receiving raw cow milk and after termical treatment - pasteurization has been measured.Design/methodology/approach: The measurements were performed with old Alfa Laval...

For establishing the body mass of live animals it is possible to use various mechanical, digital and video devices. The experimental group of 30 bulls was measured five times every 60 days from housing at the average age of 139 days (181 kg) till slaughtering (449 days, 594 kg). During experiment the bulls were weighed by electronic weighing device...

Purpose: The purpose of the paper is to presents two sowing machines for interval sowing, differing in the mode of operation. We were interested in adequacy of sowing at different working speeds of the pneumatic vacuum sowing machine OLT and the pneumatic pressure sowing machine Aeromat - Becker for sowing sugar beet. The goal of the paper is to fi...

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...

Purpose: The results of measurements shows that the chest size is not enough accurate to establish the body mass of living animals in all development stages, therefore additional measuring of the trunk length was used to increase reliability of the estimate.Design/methodology/approach: During the test 30 fattened animals were considered and were we...

Purpose: The paper presents two sowing machines for interval sowing, differing in the mode of operation. The pneumatic vacuum sowing machine OLT and the pneumatic pressure sowing machine Aeromat - Becker for sowing sugar beet are compared. We were interested in adequacy of sowing at different working speeds. The purpose of the paper is to find out...

Two sowing machines in completely identical conditions at different speeds of sowing were tested. The pneumatic vacuum sowing machine OLT and the pneumatic pressure sowing machine Aeromat - Becker are compared. We were interested in adequacy of sowing at different working speeds and to find out the optimum working speed for the individual sowing ma...

Purpose: The purpose of the paper is to show how the soybean meal is processed into the feed concentrate andhow the GMO content is tested when the soybean meal is accepted in the feed concentrate factory.Design/methodology/approach: After acceptance of the soybean meal the analysis for the protein and moisturecontend is made by the use of Inframati...

Purpose: This paper compares the effect of three types of rollers (rubber, edged and smooth) upon sprouting of three sorts of buckwheat seed (‘Darja’, ‘Bamby’ and ‘Gorenjka’). Rolling is a very important soil cultivation measure after sowing of small seed such as the buckwheat seed, particularly, during the time of drought when the test was perform...

The aim of the study was technological and economical analysis of free range cow breeding. The case study analyzed two different systems of holstein-friesian 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. Compu...

The intensive animal breeding systems can cause severe environment degradation. However, the highly productive animals are extremely sensitive to the environmental changes. The animal welfare can be in direct contradiction with the need for highly intensive and economically successful milk production. The research is aimed at complementing the meth...

The catch crops can represent a viable forage source in dry years. The aim of this paper is to present the results of the preliminary feasibility study of three different catch crops that can be used in northeast Slovenia. The Italian ryegrass (Lollium multiflorum Lam.), cow cabbage (Brassica oleracea L., convar.: acephala (DC) Alef. var viridis) a...

The objective of our research was to compare different methods of feeding of pigs. During the research the fluid machine feeding and the dry manual feeding were compared. The comparison was made on two groups of pigs divided into three groups depending on the input mass. The results show that the fluid feeding proved to be the best on the 6th group...

The paper concerns the ecological aspects of liquid manure. In order to have a better insight into the efficiency of the machine, four samples of liquid manure were analysed, namely two samples from a pit without aerators and two samples from a pit with incorporated aerator. The analysis showed that the dry matter content in the liquid manure amoun...

A total of 1 070 Simmental and Black-White first calving cows and thesame 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 abr...

Feeding on concentrates in the milking parlour was analysed in order to establish if too short time for the consumption of concentrate caused increased heart rate (HR), one of the stress indicators. 27 highly productive dairy cows were given from 1 to 5 kg of concentrate in the milking parlour. The average quantity of consumed concentrate at a sing...

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 ab...