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Biomedical subjects

Z Matyás

Publications and source records attributed to Z Matyás.

At least 37 records · Page 2Linked to original sources
PubMed1981

[The effect of adding dried swine manure to the diet of laying hens on the quality of their meat].

Two groups of laying hens (eight hens in each group) were given dried pig faeces at a concentration of 2.5% and 5% for six months and at a concentration of 5% and 10% for another five months. No signs of health disorders ascribable to the tested diet were found by the premortal examination of the hens and post-mortal veterinary inspection of the carcasses and organs of the slaughtered birds. Some differences in meat and fat composition were observed between the test and control birds, apparently without any association with the diet. Hence the addition of pig faeces to hen diet can be regarded as safe in view of hen meat quality.

Animal Feed↗
PubMed1981

[Foreign substances in the meat and organs of bulls fed on a diet of swine and poultry fecal waste].

The meat and some organs of eight bulls given diet with 5% to 15% supplements of dried pig and poultry excrements for 175 days were subjected to examination for the presence of some foreign substances. The results were compared with samples from eight control bulls, fed the basal diet. Liver was not found to contain any aflatoxins B1 and M1. No statistically significant differences were found in the content of antimicrobial substances. The same can be said of the content of chlorinated pesticides. Residues of organo-phosphorus pesticides were not detected at all. As to chemical elements, the test bulls were found to have a significantly increased content of copper in liver and diaphragm. All the findings of the residues of foreign substances were within limits tolerated by veterinary regulations.

Animal Feed↗
PubMed1980

[Investigation of the presence of aflatoxins B1 and M1 in meat products].

Sixty-four samples of thirty-one kinds of meat products were examined by the chromatographic method with the use of a thin layer of silica gel. No aflatoxin B1 was revealed in any of the samples. Positive findings of aflatoxin M1 were obtained in three products: liver pasty, smoked rolled shoulder, and in the Spis sausage. The values found in semiquantitative evaluation were lower by 2.0 to 2.5 orders than the proposed admissible aflatoxin concentration in foods for adults in the Czech Socialist Republic (5 micrograms kg-1).

Aflatoxins↗
PubMed1980

[The occurrence of foreign substances in food products from animals fed food supplements of animal excrement].

The products of the animal origin (meat, organs, adipose tissue, eggs) from bulls, pigs and poultry which had been given animal excrements as supplements to their feeds (mostly pig excrements, in one case poultry excreta) were studied as to the content of foreign substances. The almost complete absence of aflatoxin and antimicrobial substances, and the determined levels of pesticide residues and chemical elements demonstrated that the studied foreign substances did not accumulate in the tested food as a result of the presence of non-traditional components in the diets of the animals.

Aflatoxins↗
PubMed1980

[The effect of the addition of dried pig excrement to beef cattle diet on meat quality].

The carcasses and meat and fat properties of a group of five bulls fed a basal diet with an addition of 0.80 kg of dried pig excrements for 135 days were compared with a group of five control bulls fed the basal diet. The pre-mortal examination of the clinical state of the animals, the post-mortal veterinary inspection of the meat and internal organs, and the comparison of blood transaminase activity did not reveal any signs of health disorders ascribable to the experimental diet. The organoleptic examination and determination of the basic and some other technological characteristics and other properties of the meat and fat did not show any significant differences in quality to justify a decision by which the meat of the experimental bulls would be treated as less valuable or non-edible.

Animal Feed↗
PubMed1980

[The meat quality of chick broilers fed diets supplemented with dried pig excrement].

Groups of chick broilers were given diets containing a supplement of dried pig excrements at 2.5%, 5% and 10% concentrations for 55 days. Examination of the broilers before slaughtering and the post-mortal examination of the carcasses and organs did not indicate any signs of health disorders ascribable to an unfavourable influence of the diet. However, some statistically significant differences were revealed between the control group and experimental groups in the activities of blood serum transaminases, in the organoleptic evaluation, and in some chemical characteristics of meat and fat. Despite all this, the meat of the animals in all groups could be safely regarded as edible.

Animal Feed↗
PubMed1980

[The quality of meat from pigs fed a diet supplemented with the biostimulator, Vitamycin].

No statistically significant differences were observed between the tested animals, fed a diet containing the biostimulator, and the control animals, as to the quality of their meat, fat, tissue, and carcases, evaluated according to specially selected criteria. No lesions concerning a change in the health condition of the animal during the feeding experiment were found after the veterinary examination of the slaughtered pigs. The use of the Vitamycin biostimulator as a feed supplement for improving the carcass properties of pigs and the eating quality of their meat and fat cannot be regarded as useful.

Animal Feed↗
PubMed1980

[Method for the simultaneous determination of aflatoxins B1 and M1 in the liver of slaughter animals].

The method used by Egmond et al. (1979) was chosen from a number of methods recommended for the determination of aflatoxins in raw materials of animal origin. This method is described in detail to facilitate its use in practice in cases of forced slaughters of animals suspected of aflatoxicosis. The sensitivity of the method for aflatoxin B1 and M1 is about 0.05 micrograms . kg-1. On the whole, 88 liver samples were examined for the presence of the aflatoxins B1 and M1. The samples had been obtained from the slaughtered pigs (52), bulls (23), cows (6), calves (5), and from deceased pigs (2). Positive findings were obtained in five of sixteen pork liver samples and in two of the tested five samples of calf liver. All of these animals were suspected of aflatoxicosis. At current slaughter, only one case of 36 examined pigs was found to be positive. Aflatoxin M1 was found more frequently than aflatoxin B1. However, the findings never exceeded the concentration of 100 ng . kg-1; this is less by 1.5 orders than the proposed tolerated concentration for adult animals (5 micrograms . kg-1).

Aflatoxins↗
PubMed1980

[Lead content of muscles and liver of cattle].

182 samples of bovine musculature and 183 samples of bovine liver obtained from the sanitary slaughters in the North Moravian region, mostly at Frýdek-Místek, over the February and March 1978, were examined for the lead content by the method of atomic absorption spectrophotometry. The lead content in the examined samples of musculature ranged from 0 to 0.80 mg per kg (average value 0.28 mg per kg) and in the examined samples of liver from 0 to 1.23 mg per kg (average value 0.39 mg per kg); in 2.2 per cent of liver samples the level of lead was higher than 1.0 mg per kg. The highest admissible level of lead in bovine musculature and liver is being discussed, and the tolerated level of weekly intake by adult persons.

Animals↗
PubMed1980

[Chlortetracycline residues in the meat of slaughter calves in relation to transmissible microbial resistance to antibiotics].

The occurrence of chlortetracycline residues in the meat of slaughter calves in 62% herds under study (the additive of the medicated premix AUREOVIT to feed without observing the withdrawal times) did not influence significantly the Gram-negative resistant and R+ microflora isolated from the same material, in comparison with control herds that were administered no antibiotics. Neither was the spectrum of donors and transferring R plasmids influenced significantly nor the incidence of different resistance determinants. The effect of chlortetracycline addition to feed was negative (at P = 0.05) only in the occurrence of R+ microflora isolated from stable environment where the slaughtered calves had been housed.

Animals↗
PubMed1980

[Testing the screening method for assaying ochratoxin in grains].

To detect ochratoxin in grains and some feed mixtures the method described by Nesheim et al. (1973) was chosen out of a large number of analytical procedures. No ochratoxin was assayed in any of 41 samples (barley, corn, wheat, oats, complete feed mixtures, degraded straw) which were obtained from the current operation of feed-processing plants, did not contain any macroscopically detectable molds, were taken from storehouses with safe store conditions and they were evaluated by agricultural enterprises as safe. This method can be recommended to assay grains for ochratoxin in Czechoslovakia.

Animal Feed↗
PubMed1979

[Determination of aflatoxins in cheeses].

To investigate cheeses for the presence of aflatoxins we chose the very sensitive method of Tuinstra and Bronsgeest (1975) used for the determination of aflatoxin M1 in milk. The method was slightly modified and the presence of aflatoxins was determined in 54 samples of different cheeses. Aflatoxin M1 was found out in 24% of the investigated samples. Most of positive samples were found among the soft cheeses (53.8 3/4), then in processed cheeses (13.6%) and in hard cheeses (12.5%). Aflatoxin M1 was not found in the group of mouldy cheeses and Olomouc cake cheeses, which were investigated in a smaller range. Positive findings did not exceed concentrations of 10 ng per kg, i.e. they did not even reach the value of permissible concentration as proposed in the Czech Socialist Republic for foods (5 microgram per kg).

Aflatoxins↗
PubMed1979

[Aanalysis of resistance and its transferability in microflora from primary meat production].

Resistance spectra and their transferability were studied in G- strains isolated from the primary production of meat by the method after Bohus (1974). Out of the set of strains, 93% were resistant, and out of these, 65% were multiresistant. Thirty-five per cent of the resistant strains were R plasmid donors. Of the two recipients, the laboratory strain of E. coli IHE Nx was significantly better. Among the 21 determined resistance spectra, the following were the most frequent: Tc, SmTcSu, and TcAm. Transfer of two to four, or even six, different plasmid types, mostly simple, was recorded from the two most frequent complex types of donor strain resistance: SmCmTcAmSu and SmTcAmSu. The determinants Tc and Am prevailed in the spectra of the transferring R plasmids, mostly as separate markers and only in 21 to 36% of cases in more complex types.

Animals↗
PubMed1979

[Organoleptic and microbiological examination of suffocated carp stored under various conditions].

A process of dead market carp deterioration was studied in relation to conditions of the environment and the fish treatment by organoleptic and microbiological methods. A scheme is presented for fish assessment according to the symptoms of deterioration and the limits of carp storability under the given conditions of storing are determined. The results of the microbiological examination were not in keeping with the degree of deterioration of the fish.

Animals↗
PubMed1979

[The suitability of some chemical methods for evaluation of freshness of stored suffocated carp].

For the assessment of the degree of meat freshness of stored unbleeded carp some simple chemical methods were tested to be used as auxiliary criteria for veterinary decisions regarding the edibility. Under the experimental conditions where the suffocated carp were stored at cooling and room temperatures in water or in the air, differences were determined in the followed criteria between fresh and deteriorating fish which were statistically insignificant for most indicators. In view of requirements regarding chemical indicators only the determination of ribose content was found to be expedient. Changes in the levels of ribose were significantly correlated with the sense-detected changes in meat freshness of the stored carp.

Animals↗
PubMed1978

[Study on the possible presence of aflatoxin B 1 in liver and muscle tissue of slaughter animals].

Seventy-seven samples of liver (from pigs, bulls, cows, broiler chickens, layers), twenty-eight samples of white muscle (from pigs, broilers, layers), and twenty-four samples of red muscle (from pigs, broilers, layers) were examined by the modified Jacobson method (Jacobson et al. 1971) for the contingent presence of aflatoxin B1. The samples came from healthy animals, part of them from animals fed non-traditional feed containing pig excrements. Positive findings were only obtained in two samples of pork liver, out of the total number of 30 samples. One sample came from pigs fed a ration containing 5% of pig excrements, the other from a traditionally fed pig. The amounts of aflatoxin B1 found in these two samples can be treated as trace quantities, since the concentration did not exceed 0.1 microgram per kg. In the samples of muscle and liver of the other farm animals, the chromatogram did not show the presence of spots which might resemble, in colour and position, the spots of aflatoxin B1.

Aflatoxins↗
PubMed1978

[Examination of market carps for residues of antimicrobial agents].

The residues of inhibitory substances in the muscle, hepatopancreas, bile, and pyloric caeca of 30 carps from ponds south of Brno were examined by the microbiological diffusion method. The following testing micro-organisms were used: B. cereus var. mycoides (ATCC 11778), B. subtilis (ATCC 6633), Sarcina lutea (ATCC 9341), and Micrococcus flavus (ATCC 10240). Residues of inhibitory substances were not found in any of the muscle samples tested. The rest of the tested tissues showed, in some cases, small inhibition zones which seem to be due to the presence of natural antimicrobially active substances in the bile and gastro-intestinal tract of the fish rather than to the persistence of the residues of drugs given to the fish during their life.

Animals↗