Utilization of nitrogen and energy by Holstein steers fed formaldehyde- and formic acid-treated alfalfa or orchardgrass silage at two intakes     

G A Varga  H F Tyrrell  G B Huntington  D R Waldo  B P Glenn 《Journal of animal science》1990,68(11):3780-3791

Our objective was to measure the utilization of energy (E) and N by Holstein steers when fed alfalfa and orchardgrass silages offered at 65 and 90 g DM/kg live weight (LW).75 daily. Twelve steers adapted to the Beltsville respiration chambers were assigned to three Latin squares with 42-d periods. Steers in one square had permanent catheters in the portal and two mesenteric veins. Energy and N balance were measured during a 7-d collection of feces and urine that included a 3-d measurement of respiratory exchange. Energy and N variables were not different between catheterized and uncatheterized steers. Apparent digestibilities of DM, OM, CP, neutral detergent solubles and permanganate lignin were higher (P less than .01) and digestibilities of NDF and ADF, hemicellulose and cellulose were lower (P less than .01) for steers consuming alfalfa compared to orchardgrass silage. When fed alfalfa, steers' daily gross energy intake, DE, urine energy, ME, heat production and tissue energy retention were greater (P less than .01) and fecal energy losses were less (P less than .01) than when they were fed orchardgrass. Partial efficiency of ME use for tissue energy (TE) was greater (P less than .01) for steers when fed alfalfa (46.1%) than when fed orchardgrass (35.6%). Apparent ME (kcal/LW.75) required for maintenance of TE was similar for steers when fed alfalfa (133.9) and orchardgrass (131.2) silages. Nitrogen retention (g/d) was 48% greater (P less than .01) for steers when fed alfalfa (30.6) than when fed orchardgrass (20.7). This study demonstrates that steers used ME from alfalfa more efficiently for TE deposition than ME from orchardgrass.  相似文献   

Gross and histopathological study of experimental Mycoplasma mastitis of cattle     

M J Mészáros  G Horváth  L Stipkovits  Z Varga 《Acta veterinaria Hungarica》1986,34(3-4):201-209

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Identification of marker alleles linked to fire blight resistance QTLs in apple genotypes          下载免费PDF全文

David Papp  Zsuzsanna Békefi  Boglárka Balotai  Magdolna Tóth 《Plant Breeding》2015,134(3):345-349

Molecular marker analysis can be an effective tool when searching for new fire blight resistance donors. It can speed up the breeding process as well, even though many of the available markers linked to fire blight resistance QTLs have not yet been tested by screening a large number of cultivars. The aim of this study was to search for alternate sources of the three major QTLs of fire blight resistance; FBF7, FB_MR5 and FB_E, as well as to test the efficiency of some markers linked to minor QTLs. Altogether, nine primer pairs were used on 77 genotypes including new Hungarian cultivars and old apple cultivars from the Carpathian basin. Several marker alleles of FB resistance QTLs have been detected in the screened genotypes, most importantly the alleles coupling with FB_MR5 in the old cultivars ‘Kéresi muskotály’, ‘Szabadkai szercsika’ and ‘Batul’. We propose these cultivars as the first available resistance donors of FB_MR5 instead of the crabapple Malus × robusta 5. The results also bring new information regarding the resistance alleles of new Hungarian cultivars and selections.  相似文献   

Isolation of mycoplasmas from bull semen and serological examination of aborted cows sera for presence of Mycoplasma antibodies     

L Stipkovits  J Mészáros  B Pázmany  Z Varga 《Archiv fuer experimentelle veterinaermedizin》1983,37(3):429-433

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Droncit--a milestone in the control of Echinococcus granulosus in dogs.     

T Kobulej  I Varga 《Acta veterinaria Academiae Scientiarum Hungaricae》1976,26(3):351-355

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Experimental transmission of Eimeria stiedai to the hare.     

I Varga 《Acta veterinaria Academiae Scientiarum Hungaricae》1976,26(1):105-112

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Carbon kinetics of milk formation in Holstein cows in late lactation   总被引：3，自引：0，他引：3  

T W Boutton  H F Tyrrell  B W Patterson  G A Varga  P D Klein 《Journal of animal science》1988,66(10):2636-2645

Carbon transfer to milk in Holstein cows in late lactation was measured by introducing changes in the natural stable carbon isotope composition of the feed. Six Holstein cows in mid-lactation were placed on a diet naturally low in 13C (-25.0% vs Pee Dee belemnite [PDB] an international carbon isotope standard), based on alfalfa-barley, and six others were placed on a diet naturally enriched in 13C (-11.5% vs PDB), based on corn. After a 7-wk equilibration period on these diets, three cows were switched from alfalfa-barley to corn, and three were switched from corn to alfalfa-barley. The three other cows in each group served as controls. 13C/12C ratios were measured in daily morning milk samples during the week before and for 6 wk after the changes in diet. After the diets had been switched, milk isotope ratios rapidly approached the isotopic composition of the new diet, indicating rapid transfer of dietary carbon into milk. The data were consistent with a model whereby milk was synthesized from a single precursor pool that responded rapidly to dietary perturbation. The milk precursor pool had a half-life of approximately .9 d and had a mass of approximately 7 kg of carbon, which was renewed daily by the entry of 5 kg of digestible dietary carbon.  相似文献   

In vitro testing of the anti-mycoplasma effect of some anti-coccidial drugs     

L Stipkovits  T Kobulej  Z Varga  S Juhász 《Veterinary microbiology》1987,15(1-2):65-70

The anti-mycoplasma effects of the ionophores (lasalocid sodium, monensin and nigericin) were compared with that of tylosin tartrate and tiamulin in vitro. Forty-four strains representing 14 avian and 10 mammalian Mycoplasma species and serotypes and 5 Acholeplasma species were tested. The ionophores showed average minimal inhibitory concentration (MIC) values between 3.65 and 4.93 micrograms ml-1 for all strains, the MIC values for glucose-fermenting strains were between 2.26 and 3.75 micrograms ml-1, significantly lower than for arginine-hydrolysing strains (9.27-13.12 micrograms ml-1). These values were significantly higher than those obtained with tylosin tartrate (0.45 micrograms ml-1) or tiamulin (0.13 micrograms ml-1). The ionophores were more efficacious against acholeplasmas (0.06-0.25 micrograms ml-1) than against mycoplasmas.  相似文献   

The effect of irradiation on the embryonic and postembryonic development of Amidostomum anseris (Zeder, 1800)     

D V Phuc  I Varga 《Acta veterinaria Academiae Scientiarum Hungaricae》1972,22(2):197-203

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Immune response of thymectomized and bursectomized chickens to Syngamus trachea infection     

I Varga 《Acta veterinaria Academiae Scientiarum Hungaricae》1971,21(1):107-110

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