Acta Agraria Kaposváriensis http://journal.ke.hu/index.php/aak <p>ISSN 1418-1789 (Nyomtatott)<br />Az Acta Agraria Kaposváriensis évente több alkalommal megjelenő tudományos folyóirat, amely eredeti tudományos közleményeket, kutatási eredményeket, kritikai összefoglalókat (review), könyvismertetőket, konferenciákról szóló ismertetéseket és különszámként teljes konferenciaanyagokat közöl a mezőgazdasággal kapcsolatos alap- és alkalmazott tudomány területeiről.<br />Alapítva: 1997-ben a Kaposvári Egyetem jogelőd intézményében a Pannon Agrártudományi Egyetem Állattenyésztési Karán.</p> Magyar Agrár- és Élettudományi Egyetem Kaposvári Campus Kaposvár Guba S. u. 40. 7400 hu-HU Acta Agraria Kaposváriensis 1418-1789 Maternal cortisol level around conception is associated with offspring sex ratio in captive European wild rabbit (Oryctolagus cuniculus) http://journal.ke.hu/index.php/aak/article/view/2793 <p>The sex ratio of the offspring at birth is usually 1: 1 established by natural selection. The sex allocation model predicts that if parents have adequate resources, they would benefit from differentially allocating maternal investment to that sex having higher fittness under the particular environmental conditions. However, little is known about what mechanisms would result in biased sex ratio. One such mechanism could be the interaction of of stress reactivity and progesterone levels in the mothers around conception. In the present investigation the fecal cortisol and progesterone levels at the day of conception were measured in fifteen European wild rabbit does kept in cages. The does were clustered to low and high cortisol response groups and the sex ratio of their progeny was determined. We found a significant correlation between the progesterone levels of mothers and their stress status measured at the mating. This correlation was also reflected in the sex ratio bias in their litters. Even though the litter size was not different, we found higher progesterone levels and more female offspring in the does with higher cortisol levels indicating that maternal status around conception may affect the litter sex ratio.</p> Ildikó Benedek Vilmos Altbäcker Attila Zsolnai Tamás Molnár Copyright (c) 2022 Benedek Ildikó, Altbäcker Vilmos, Zsolnai Attila, Molnár Tamás https://creativecommons.org/licenses/by-nc-nd/4.0 2022-07-29 2022-07-29 26 1 7 16 10.31914/aak.2793 Application possibilities of survival analysis for time-to-event data in animal science http://journal.ke.hu/index.php/aak/article/view/2837 <p>The application efficiency of several statistical methods was tested based on an open field behavior test of mice. The examined trait was the duration time until the animals approached the experimenter’s hand. The available time was fixed in 300 seconds. There were monitored 80 mice belonging to two different species of the Mus genus in equal proportion. Besides, male and female and young and adult animals have also represented the evaluated groups in equal proportions. The data of the examined trait was analyzed with Generalized Linear Models, Kaplan-Meier survival curves, and with Cox Proportional hazard model. The applied statistical procedure provided completely discordant results. According to the GLM results none of the examined factors (species, sex, and age) had significant effects on the examined variable. On the contrary, all factors proved to be significant using a procedure based on the survival analysis. Kaplan-Meier survival curves indicated a higher proportion of individuals successfully approaching the experimenter’s hand in all of the compared groups representing different species sexes and ages, respectively. The estimated Cox regression coefficients were significant indicating the significant effects of the species, sex, and age on the investigated trait. Based on the estimated Hazard ratios the probability that in the next time unit a successful approach of the experimenter’s hand would occur is three times more likely for one species than the other, twice as much for males and the juveniles than for the females and for the adults. Based on the present study it could be concluded that the successful approach of the experimenter’s hand by the mice is clearly “time to event data” thus it is suitable to be analyzed with survival analysis procedures. It could be concluded that applying conventional GLM was not adequate because due to the lack of the successful approach and approach times the censored data should not be used and thus the sample size would largely be reduced.</p> Boróka Bárdos Ildikó Benedek Oleksandr Kodak Nagy István Copyright (c) 2022 Bárdos Boróka, Benedek Ildikó, Kodak Oleksandr, Nagy István https://creativecommons.org/licenses/by-nc-nd/4.0 2022-07-29 2022-07-29 26 1 17 26 10.31914/aak.2837 In vivo classification of two closely related species of mice, mound-building mouse (Mus spicilegus) and house mouse (Mus musculus) http://journal.ke.hu/index.php/aak/article/view/2656 <p>Correct identification of similar, closely related species with overlapping distribution is a crucial point in field biology. In small mammal studies, species identification is particularly problematic in population studies using trapping where live animals need to be identified. The aim of our research was to develop a method making the classification of the two Hungarian mouse species, mound-building mouse (<em>Mus spicilegus</em>) and house mouse (<em>Mus musculus</em>) possible based on morphometric characters. The basis to obtain reference data was the captive populations of caged animals housed in our laboratory where the true species classification was known for every animal. Body weight, body length, tail length, and tail diameter were measured for 56-56 individuals from both species. From these measurements the ratio of the body length/tail length was also calculated. Besides, the sex and age of these animals were also recorded. Data analysis consisted of stepwise discriminant procedure and discriminant analysis, respectively. The stepwise discriminant procedure restricted the morphometric characters to the ratio of the body length/tail length and tail diameter. Performing the discriminant analysis to these body measures a perfect classification was obtained even using cross-validation. Thus, applying the obtained discriminant function to the classification of any live trapped mice is feasible.</p> Boróka Bárdos Bianka Kovács Nagy István Vilmos Altbäcker Copyright (c) 2022 Bárdos Boróka, Kovács Bianka, Nagy István, Altbäcker Vilmos https://creativecommons.org/licenses/by-nc-nd/4.0 2022-07-29 2022-07-29 26 1 27 35 10.31914/aak.2656 Water balance calculation capability of hydrological models http://journal.ke.hu/index.php/aak/article/view/2877 <p>Currently, in the world, there are many different hydrological models built and developed to solve problems related to the hydrological cycle. Each model has its specific mathematical foundations to describe physical processes in nature. Therefore, each model has its various characteristics: setting up the model, input data requirements, model calibration and verification, and output results. Water balance is still playing an important role in the effective management and use of water resources for agriculture. Based on the results of the hydrological parameter’s calculation, the water balance of the study basin can be calculated by the user or by the separated module of each model. Each hydrological models have its advantages and disadvantages. However, it is impossible to simulate hydrological processes and water balance completely accurately in nature. Still, simulation results can give us a view of the changing trend of hydrological components and the water balance. Model developers are gradually completing the shortcomings and improving the efficiency and accuracy so that the model can simulate reality with the highest accuracy. This paper sets out to review the fifteen hydrological models currently widely used in the world. Within the frame of the present study, some models are only briefly introduced; the rest are considered in more detail, from more aspects, from specific examples so that readers can decide for themselves which model is suitable for their study area and simulation needs, especially in the identity of the complex and unpredictable impacts of climate change on the agricultural sector.</p> Hop Quang Tran Zoltán Zsolt Fehér Copyright (c) 2022 Hop Quang Tran, Fehér Zoltán Zsolt https://creativecommons.org/licenses/by-nc-nd/4.0 2022-07-29 2022-07-29 26 1 37 53 10.31914/aak.2877 A csemegekukorica párolgásdinamikájának vizsgálata Thornthwaite-Mather féle kompenzációs evapotranszspirométerben http://journal.ke.hu/index.php/aak/article/view/2851 <p>According to the data provision of the National Meteorological Service, since the early 1980’s an intense warming has begun and it is also reflected in domestic observations. In Hungary, just as in other Central European countries, the extremes of weather events are becoming more common. As a main crop, maize (sweet corn) has an outstanding national and global significance. Certainly, global warming and changes in water supply will harmfully affect the cultivability of maize too. Water stress reduces the leaf surface, therefore because of the less captured photosyntetically active radiation, biomass production and yields will be reduced. Weeds with a wider tolerance range than crops may also become increasingly dangerous competitors in field crop production because of their wide tolerance range, fertility and strong adaptability to changing climate- and precipitation conditions. In this research the effect of climate change on the evapotranspiration of maize was investigated at the Agrometeorological Research Station of MATE Georgikon Campus in Keszthely, between 21 May 2021 and 1 September 2021 in Thornthwaite-Mather type compensation evapotranspirometer. The aim of the study was to assess the main characteristics (like leaf area index, daily evapotranspiration, and yield) of sweetcorn under optimal water supply conditions. Furthermore it was also an aim to determine how weeding affects plant characteristics so half of the treatment (1 vessel of the evapotranspirometer) was kept weed-free, while the other half was exposed to natural weeding. In terms of results, positive relation between temperature and evapotranspiration was found and it has been established, that maximum temperature has a greater effect on evapotranspiration, than daily mean temperature. In case of yield indicators, the negative effect of weeding was statistically detectable and it was also pointed out, that the presence of weeds can negatively affect the quantity of crops. The results of the study was compared to a number of other researches on the subject, and it was concluded that the negative consequences of climate change, especially the increasing frequency of drought-hot periods could pose a major threat to successful maize production in the future.</p> Tóth Ariel Gábor Soós Szabina Simon Brigitta Simon-Gáspár Copyright (c) 2022 Tóth Ariel, Gábor Soós, Simon Szabina, Simon-Gáspár Brigitta https://creativecommons.org/licenses/by-nc-nd/4.0 2022-07-29 2022-07-29 26 1 55 69 10.31914/aak.2851 Előzetes eredmények egyes szarvasmarha húsrészek zsírtartalmának és zsírsavösszetételének összefüggéséről http://journal.ke.hu/index.php/aak/article/view/2700 <p>Vizsgálatunk célja az volt, hogy megállapítsuk, hogy a kiskereskedelmi forgalomban vásárolt szarvasmarha húsrészek (felsál, rostélyos, lapocka és a nyakhús) zsírtartalmában és zsírsavösszetételében, illetve az egészségre előnyös hatással rendelkező konjugált linolsavak mennyiségében mutatható-e ki különbség; illetve a fenti összetevők értékei milyen mértékű szóródást mutatnak azonos néven vásárolt húsrész esetében. Továbbá elemeztük, hogy van-e kapcsolat a marhahús zsírtartalma és zsírsav profilja között, azaz gyakorol-e bármiféle hatást a zsírsavösszetételre a hús zsírtartalmának csökkenése vagy növekedése. A húsmintákat egy helyi húsüzem boltjából szereztük be öt héten keresztül. A zsírsavösszetétel- és konjugáltlinolsav-tartalom vizsgálatot átészterezést követően lángionizációs detektorral ellátott gázkromatográffal végeztük el. A vizsgált tápanyagkomponensek esetében megállapítható volt, hogy a szarvasmarha húsrészek között – az egyszeresen telítetlen zsírsavak összege (MUFA) és az arachidonsav kivételével – nem tudtunk szignifikáns különbséget kimutatni, konjugált linolsav tartalmuk sem különbözött jelentősen egymástól. Az eltérő húsrészekből származó mérési adatokat összevontan elemezve úgy találtuk, hogy minél több zsír volt a marhahúsban, annál egészségtelenebb volt a zsírsavösszetétele, mivel arányaiban annál több telített zsírsavat (SFA) (r=0.663, P=0.001) és annál kevesebb többszörösen telítetlen zsírsavat (PUFA) tartalmazott (r=-0.621, P=0.004). Tehát elmondható, hogy a fokozott zsírbeépülés nemcsak a nagyobb zsír- és a kisebb színhús-tartalom miatt lehet káros a húsminőségre, hanem a zsírsav-profil előnytelen megváltozása miatt is. Ugyanis minél jelentősebb az elzsírosodás mértéke, annál kedvezőtlenebbé válik a zsírsavprofil, mivel növekszik a telített zsírsavak aránya a telítetlenekhez képest. Ez a tendencia már kis mintaszámú vizsgálatunkban is szignifikánsnak mutatkozott.</p> Balázs Szokol Vargáné Visi Éva Copyright (c) 2022 Szokol Balázs, Vargáné Visi Éva https://creativecommons.org/licenses/by-nc-nd/4.0 2022-07-29 2022-07-29 26 1 71 81 10.31914/aak.2700