Poljoprivredni fakultet u Osijeku

Osijek, Croatia

Poljoprivredni fakultet u Osijeku

Osijek, Croatia
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Gantner V.,Poljoprivredni fakultet u Osijeku | Mijic P.,Poljoprivredni fakultet u Osijeku | Kuterovac K.,Agrokor d.d | Solic D.,Hrvatska poljoprivredna agencija | Gantner R.,Poljoprivredni fakultet u Osijeku
Mljekarstvo | Year: 2011

The objectives of this study were to determine the microclimatic conditions in stables in three climactic regions (East, Mediterranean, and Central) of Croatia as well as to evaluate the effect of temperature-humidity index (THI) values on the daily production of dairy cattle. With that purpose, 1675686 test-day records collected from January 2005 until April 2010 were extracted from HPA (Croatian Agricultural Agency) database. For estimation of the effect of THI on daily production of dairy cows fixed-effect model that took into account the effects of lactation stage, breed, calving season, measuring season, and THI group (T1 - THI≤72; T2 - THI>72) was used. Model was applied to each class of parity (P1, P2, P3, P4 and P5) and region. During the analysed period, the highest monthly averages of ambient temperature were determined in Mediterranean region, the highest monthly averages of relative humidity were observed in Central region, while the highest monthly mean values of temperature-humidity index (THI) were determined in Mediterranean region. Heat stress conditions indicated with mean daily values of THI>72 were determined during spring and summer season in all analysed regions. Absence of heat stress conditions during autumn and winter season also characterised all three regions. Highly significant (P<0.01) decrease of daily milk yield as well as of daily fat and protein content due to enhanced THI was observed in all cows regardless the parity class and in all three climatic regions. Furthermore, the most deteriorate effect of heat stress was observed in East region. During heat stress period, with the aim of minimization of the effects of heat stress, it is necessary to regulate management strategies in the dairy herd.

Matosa Kocar M.,Poljoprivredni Institute Osijek | Sudaric A.,Poljoprivredni Institute Osijek | Vila S.,Poljoprivredni fakultet u Osijeku | Petrovic S.,Poljoprivredni fakultet u Osijeku | And 3 more authors.
Poljoprivreda | Year: 2017

The aim of this research was to determine the genetic variability of chosen soybean lines in seed quality by determining diversity in phenotypic expression of 1000 seed weight, as well as protein and oil concentrations in the seed. Field trials were set up in a randomized, complete block design with two replications, at the Agricultural Institute Osijek during three growing seasons (2010-2012). Each year, after harvest, 1000 seed weight, and protein and oil concentrations in the seed were determined. Statistical analyses of the results included: calculating basic measures of variation and analysis of variance. The analyzed data showed the existence of plant material’s diversity in phenotypic expression of investigated seed quality traits, as well as the existence of statistically significant genotype and year effects. © 2017, Faculty of Agriculture in Osijek. All rights reserved.

Habitat is defined as a set of natural resources and conditions present in a given area that ensures the stability of the population that it inhabits. Antlers of Cervidae family are an example of fast growing tissues and the only organs of the mammals capable of complete regeneration. Each year the antlers are discarded and each year the new set of antlers are grown. This is called a cycle of antler growth and it is closely associated with the reproductive cycle, hormonal processes, climate and hydrological factors. Climatic and hydrological factors can influence directly through air temperature, precipitation (rain, snow), ground cover (rain, snow), sunlight hours (photoperiod) and hydro levels. Climatic and hydrological factors can influence indirectly through vegetation as a source of food. The aim of this paper is to link climate and hydological factors with the developement level of red deer antlers. The research area is periodically flooded parts near the rivers of Danube and Drava and it lies in the northeastern part of Republic of Croatia, on the border with Hungary and Serbia. At this unique natural areas one can find habitats for many species of plants and animals and it also represents an preserved habitat of red deer (Cervus elaphus). The study lasted for six hunting years - from 2004/2005. to 2009/2010. For this current study the data were taken from middle aged and mature stags (five and more years old). Total of 382 stags were measured. The value of antlers were observed through the following traits of red deer antlers: antler weight, total lenght of branches, lenght of tird tine and the number of tines. Hunting year 2007/2008. showed values of observed characteristics significantly higher than hunting years of 2004/2005., 2005/2006. and 2006/2007, as compared to hunting year of 2008/2009. and 2009/2010. observed values were not significantly higher but they were higer and that is in a biological sense equally important. The management measures were the same throught the years of research. Hydrological report showed that regular spring flooding of the Danube river failed in year 2007. and that was not the case during the other years of research. It would be normal that the average monthly temperature during the coldest months for this habitat was below zero but during the end of 2006. (November and December) and in the beginning of 2007. (Januar and Februar) the average temperature was from 2,9 to 8,4 °C above zero. That was the maximum temperature during the winter in 10 year period and that was winter with the least number of cold days (<0,0 °C) (35 days during these four months). Rainfall in the firs three monts of 2007. were slightly above average (142 l) but during April and May the level of rain was up to three time lower in the relation to the other years of research. Number of days with snow was only two days during the coldest months of 2006. and 2007. and the height of snow cover for this two days was 1 cm. In the first five months during 2007. there were more sunshine hours than in other years of research, especially during the month of April when the growth and developement of antlers is most intense. Based on the results presented in the text above the values of measured antler traits were highest in huntig year 2007/2008. and that was because of extremely favorable climatic and hydrological conditions in a significant time for antler growth and developement. The results from this research can be a guidance for future prediction of red deer antler developement in a sence of creating management measures.

Svitlica B.,Ivana Bunjevac | Cosic J.,Poljoprivredni fakultet u Osijeku | Simic B.,Poljoprivredni Institute Osijek | Vrandecic K.,Poljoprivredni fakultet u Osijeku | And 2 more authors.
Poljoprivreda | Year: 2011

Growth and sporulation of selected isolates of F. graminearum, F. verticillioides and F. subglutinans were examined over 15 days on seven different media of diverse pH levels and under two light conditions. All isolates formed the most densd mycelia and had the fastest growth on PDA media and under dark conditions. F. graminearum had the weakest sporulation on all media. F. verticillioides and F. subglutinans sporulated well on the all investigated media. Statisticaly significant slower mycelial growth was determined on pH 4.5 for all species.

Cupic T.,Poljoprivredni Institute Osijek | Popovic S.,Poljoprivredni Institute Osijek | Gantner R.,Poljoprivredni Fakultet u Osijeku | Tucak M.,Poljoprivredni Institute Osijek | Sudar R.,Poljoprivredni Institute Osijek
Mljekarstvo | Year: 2010

The objectives of this study were to estimate usage possibilities of semi-leafless winter pea type in voluminous feed production in mixture with cereals and to evaluate its quality in relation to standard leafed cultivars. Difference in average yields of green mass between two pea types was not significant. Significant differences were found within combinations types, ranged from 38.63 to 54.67 t ha-1 for combinations with standard leaf type and from 40.51 to 51.09 t ha-1 for combinations with semi-leafless pea type. In average, semi-leafless combinations were achieved digestive proteins yield of 1026 kg ha-1, what ensured 17101 L of milk ha-1 and 49807 MJ ha-1 of energy production, sufficient to hold norm of dairy cow and milk yield of 15712 L ha-1.

Saric G.K.,Poljoprivredni fakultet u Osijeku | Klapec T.,Prehrambeno tehnoloski fakultet | Milakovic Z.,Poljoprivredni fakultet u Osijeku | Sarkanj B.,Prehrambeno tehnoloski fakultet | Pavlovic H.,Prehrambeno tehnoloski fakultet
Poljoprivreda | Year: 2011

Contamination with phytopathogenic forms of Fusarium, besides field crops, may also occur in stored products. Addition of antifungal substances to stored livestock feed is therefore common. This paper examined the effectiveness of a mixture of synthetic and natural antioxidants against the growth of Fusarium graminearum and F. verticillioides in a concentrate mixture. The most effective inhibition of growth was achieved with a mixture of butylated hydroxyanisole, propyl paraben and thymol.

Paradikovic N.,Poljoprivredni fakultet u Osijeku | Vinkovic T.,Poljoprivredni fakultet u Osijeku | Stolfa I.,Odjel za biologiju | Tkalec M.,Poljoprivredni fakultet u Osijeku | And 4 more authors.
Poljoprivreda | Year: 2012

Numerous studies conducted on garlic (Allium sativum L.), have proved the presence of antioxidants, phenolic compounds, sulfur compounds and several vitamins. The aim of this study was to investigate the differences in the content of total phenols, ascorbic acid; total antioxidant activities of four winter Slavonian garlic cultivars, as well as establishment of correlations between these parameters. The total antioxidant activity and the content of ascorbic acid and total phenols in four cultivars of winter Slavonian garlic were spectrophotometrically determined. Genetic diversity of winter Slavonian garlic cultivars significantly affected the content of ascorbic acid and the total antioxidant activity. The total antioxidant activity significantly positively correlated with the content of ascorbic acid (r2 = 0.64, p = 0.006), while the content of total phenols and total antioxidant activity were not significantly related. Cultivar PFO 1 had the highest antioxidant activity (8.006 μmol Trolox /g FW) and the highest ascorbic acid content (8.57 mg /100 g FW), thus, the best quality of the four tested garlic cultivars.

Paradikovic N.,Poljoprivredni Fakultet U Osijeku | Vinkovic T.,Poljoprivredni Fakultet U Osijeku | Vinkovic-Vrcek I.,Institute Za Medicinska Istra Zivanja i Medicinu Rada | Teklic T.,Poljoprivredni Fakultet U Osijeku | And 2 more authors.
Poljoprivreda | Year: 2010

Anti-oxidative activity of pepper fruits, total and commercial yield, number of non-commercial and BER fruits under influence of bio-stimulant treatment and pepper hybrid were investigated in this experiment. Significantly highest anti-oxidative activity, determined by DPPH assay, was recorded in treated Century F1 hybrid pepper plants. Also, positive significant correlation (r=0.526*) between commercial yield and anti-oxidative activity appeared. Generally, treatment with bio-stimulants positively influenced all investigated parameters in Century F1 hybrid, while in Blondy F1 significantly decreased number of non-commercial and BER fruits. At the end, compared to untreated plants, treatment resulted in higher commercial yield in both hybrids.

The overall objective of the study was to determine the attitudes associated with issues about the production of wheat. We have analyzed the responses of 130 wheat producers from the five counties of eastern Croatia, deliberately chosen from the Farm Register. The questionnaire contained several themes: Country-policyagricultural production, Production Technology-Economy, Purchase of wheat and Wheat production and impact of EU accession. It appears that participants have the most positive attitudes in the aspect of Production Technology- Economy, and the most negative in the aspect of Country-policy-agricultural production. In the aspect of Production Technology-Economy, more positive attitudes have participants who work in economies with a large number of members (more than 5). Low to medium high positive significant correlations, found between certain aspects of attitudes about wheat production, suggest that the attitudes to all questions related to the production of wheat are similar. Older workers (age group 61-80 years) have a negative attitude to the aspects of Production Technology- Economy and Wheat production and impact of EU accession. Among the links between certain aspects of attitudes on wheat production with selected agroeconomics indicators, highlights the finding that some of these indicators are negatively associated with private ownership of land, and positively with the lease of the land, in separate aspects of Production Technology-Economy, Purchase wheat and Influence of entry into the EU. © 2014, Faculty of Agriculture in Osijek. All rights reserved.

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