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- TételKorlátozottan hozzáférhetőAZ IVÓVÍZ-TEMPERÁLÁS HATÁSÁNAK VIZSGÁLATA MELEGBEN TARTOTT ANYANYULAK TERMELÉSÉRETerhes, Katalin; Gerencsér, Zsolt; Szendrő, Zsolt; Nagy, István; Radnai, István; Kasza, Rozália; Matics, Zsolt; PhD hallgató; egyetemi oktató, kutató
- TételSzabadon hozzáférhetőHistorical overview of the selection indices applied in pig breedingKodak, Oleksandr; Nagy, István; PhD hallgató; egyetemi oktató, kutatóAuthors summarized the different selective animal breeding methods used in the pig breeding sector in the last few decades. Advantages and disadvantages of the conventional selection index procedures were summarized. The superiority of BLUP breeding values over the mass selection procedure was clarified. The economic aspects of the different traits were also examined and the most up to date economic BLUP indices were introduced as well.
- TételKorlátozottan hozzáférhetőRovarliszt a baromfitakarmányban I. részSzendrő, Katalin; Szendrő, Zsolt; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőA tehéntej zsírsavösszetételének javítása takarmányozás útjánTóth, Tamás; Mwau Mwangi, Paul Joseph; Andrássyné Baksa, Gabriella; Bázár, György; PhD hallgató; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőA közeli infravörös spektroszkópia mint korrelatív gyorsvizsgálati módszer gyakorlati értékeléseTóth, Tamás; Bázár, György; Romvári, Róbert; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőEffects of Different Infra-Red Irradiations on the Survival of Granary Weevil Sitophilus granarius: Bioefficacy and SustainabilityKeszthelyi, Sándor; Lukács, Helga; Pál-Fám, Ferenc; PhD hallgató; egyetemi oktató, kutatóSitophilus granarius (L.) is an important pest of stored grain worldwide. In recent years, sustainable methods against it have received attention as grain stock protective means. Our aim was to obtain information about the efficacy of infrared irradiation (IR) against S. granarius in laboratory conditions. The change in adult-activity and median lethal dose (LD50 ) triggered by IR in S. granarius was examined. The insecticidal efficacy in the infested grains was also analyzed at 12, 24, 48, and 72h following exposure to IR (250W), and the progeny-production was assessed 45 days upon the treatment. Based on our findings, total mortality ensued in a grain stock of 50 g at 412 s and a for 100 g grain at 256 s. A significant increase in S. granarius mortality could be observed in the higher grain weight regime, which can be accounted for by the higher heat-absorbance of objects with higher weight. The activity of pests immediately after the beginning of IR increased and subsequently became moderated. The observation of activity-peak brought about by irradiation contribute to the optimization of chemical intervention. This treatment could provide an effective and sustainable technique in integrated pest management.
- TételSzabadon hozzáférhetőWorldwide distribution and theoretical spreading of Trichoferus campestris (Coleoptera: Cerambycidae) depending on the main climatic elementsKeszthelyi, Sándor; Fehér, Balázs; Somfalvi-Tóth, Katalin; egyetemi oktató, kutatóThe velvet longhorned beetle, Trichoferus campestris (Coleoptera: Cerambycidae) is a serious wood-boring pest that is a major threat to the phytosanitary condition of forests and orchards. Its worldwide expansion is a major concern for plant health. We have collected all bibliographical references, phytosanitary reports and authentic photographic evidence from entomological websites to determine the worldwide distribution of T. campestris. The theoretical directions of the spreading and actually occupied area of this arthropod pest were determined over the whole Holarctic range. Furthermore, the potential distribution area was cal- culated using cumulated temperature in the growing season averaged over 15 years both in the Palearctic and Nearctic regions. Holarctic expansion of the species, including the main parts of North America and Eurasia, is clearly indicated. Its populations occur in 29 countries to date, supported by documentation from 64 publications and 30 online forums. Its spread is continuously westward in the Palearctic; in the Nearctic, the spread was first southward from the Great Lakes region then eastward from Utah. The spe- cies has excellently adapted to circumstances of freight by ship and plane, as wood is often used, ensuring optimal conditions for the pest. In addition, the active spreading achieved by flying is an important factor contributing to its expansion. The primary criterion for controlling the species would be the introduction of a monitoring system in affected and exposed areas.
- TételKorlátozottan hozzáférhetőLight-trap catch of cotton bollworm, Helicoverpa armigera in connection with the moon phases and geomagnetic H-indexKeszthelyi, Sándor; Puskás, János; Nowinszky, László; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőReaction of Ambrosia artemisiifolia L. populations to herbicides – resistance or technological fault?Kazinczi, Gabriella; Varga, Ákos; Kerepesi, Ildikó; Hoffmann, Richárd; Nagy, Margit; Benécsné Bárdi, Gabriella; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőA szántóföldi kártevők jelentőségének átrendeződése napjainkban (2.)Keszthelyi, Sándor; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőA születési súly szerepe a nyulaknál (1. rész)Szendrő, Zsolt; Szendrő, Katalin; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőA szántóföldi kártevők jelentőségének átrendeződése napjainkban (1.)Keszthelyi, Sándor; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőChallenges and adaptive strategies in pig breeding from the aspect of heat stress and heat toleranceNagy, István; Kövér, György; Gerencsér, Zsolt; Szász, Gabriella; egyetemi oktató, kutatóAuthors summarized the results of the last three decades’ relevant literature examining the temperature effects on the various growth, reproductive and carcass traits in pigs. The ideal period of temperature measurement and the different methodologies characterizing temperature effects were summarized. The aspects of genotype environment interaction for the measured traits under hot and temperate conditions were also presented. Finally the possibilities of direct genetic selection for heat tolerance and its possible selection criteria traits were also discussed.
- TételKorlátozottan hozzáférhetőAnyanyulak elhullása és selejtezéseSzendrő, Zsolt; Barna, Judit; egyetemi oktató, kutató
- TételKorlátozottan hozzáférhetőMycotoxins in the food chainKovács, Melinda; Szabó, András; Szabó-Fodor, Judit; egyetemi oktató, kutató
- TételSzabadon hozzáférhetőCT-supported analysis of the destructive effects of Varroa destructor on the pre-imaginal development of honey bee, Apis melliferaKESZTHELYI, Sándor; SIPOS, Tamás; CSÓKA, Ádám; DONKÓ, DONKÓ; BSc, MSc hallgató; PhD hallgató; egyetemi oktató, kutatóThe ectoparasitic mite, Varroa destructor , is a most important health risk for European honey bee subspecies (Apis mellifera ) globally. There is a scarcity in experimental approaches addressing this issue by using computed tomography. Our purpose was to determine the decrease in the volume, surface, density and weight alteration triggered by V. destructor in pre-imaginal stages of A. mellifera using computer-based 3-D reconstruction technology. Computer tomography used in the current study proved to be sufficiently sensitive for the detection of V. destructor in comb cells. This non-invasive experimental setup revealed that the developing worker pupae have retained their volume and surface values, whereas the weight loss triggered by V. destructor was statistically confirmed. In addition, the disappearance of lower radiodensity tissues is shown to be due to mite parasitism, which can be primarily explained by haemolymph losses.
- TételKorlátozottan hozzáférhetőAZ IVÓVÍZ-TEMPERÁLÁS HATÁSÁNAK VIZSGÁLATA MELEGBEN TARTOTT NÖVENDÉKNYULAK TERMELÉSÉRETerhes, Katalin; Gerencsér, Zsolt; Szendrő, Zsolt; Nagy, István; Radnai, István; Kasza, Rozália; Matics, Zsolt; PhD hallgató; egyetemi oktató, kutató
- TételSzabadon hozzáférhetőAssessment of short-term mortality of granary weevil, Sitophilus granarius (Coleoptera: Curculionidae) triggered by different microwave irradiation powersKeszthelyi, Sándor; Nyári, András; Pál-Fám, Ferenc; egyetemi oktató, kutató
- TételSzabadon hozzáférhetőEffect of ambient temperature on the productive and carcass traits of growing rabbits divergently selected for body fat contentMatics, Zsolt; Gerencsér, Zsolt; Kasza, Rozália; Terhes, Katalin; Nagy, István; Radnai, István; Dalle Zotte, Antonella; Cullere, M; Szendrő, Zsolt; egyetemi oktató, kutatóRabbits are particularly sensitive to heat stress which can affect productive performance, with rabbit breed/line possibly playing a role on the response to this condition. The study aimed at evaluating the effect of different ambient temperatures on the live performance and carcass traits of growing rabbits divergently selected for total body fat content. The two genetic lines (Lean and Fat) were selected based on the total body fat content estimated by computer tomography during five generations. From birth to slaughter (13 weeks of age), the rabbits were housed in two rooms where the temperature was controlled with air conditioners: in the control room the average ambient temperature was 20 °C and in the high temperature room it was 28 °C. After weaning (35 d), 60 Lean and 60 Fat rabbits/room were housed by two in wire-mesh cages and fed ad libitum with commercial pellets. The BW and feed intake (FI) were measured at 5, 7, 9, 11 and 13 weeks of age to calculate the daily weight gain (DWG) and feed conversion ratio (FCR). Mortality was recorded daily. At the end of the experi ment, rabbits were slaughtered and carcass traits were measured. Mortality was independent of temperature and line. The temperature significantly influenced the FI, DWG, BW and the fat deposits: they were lower at higher ambient temperature. The effect of temperature differed according to the rabbits' total body fat content. At control temperature, the FI (165 vs 155 g/day; P < 0.05) and FCR (4.67 vs 4.31; P < 0.05) were higher in Fat rabbits, which also had more perirenal (36.2 vs 23.1 g; P < 0.05) and scapular fat (10.8 vs 7.1 g; P < 0.05). At high temperature, no differences in fat depots (14.5 vs 9.8 g; 5.3 vs 3.5 g) were found between the two lines. It can be concluded that temperature × genetic line interaction had an important role in productive and carcass traits, as the effect of temperature differs between Lean and Fat rabbits.
- TételKorlátozottan hozzáférhetőNéhány gondolat a gyorsvizsgálati NIR technika mezőgazdasági alkalmazásairólBázár, György; Kovács, Zoltán; Romvári, Róbert; Tóth, Tamás; egyetemi oktató, kutatóBemutatjuk a NIR technika napjainkban elérhető alkalmazási lehetőségeit, illetve felvillantjuk azokat az irányokat, amelyekkel jelen ismereteink alapján a közeli jövőben találkozhatunk majd a piacon.