Catalase activity in various types of bovine and porcine adipose tissue     

O Zatocil  S Stíchová  F Stícha 《Veterinární medicína》1974,47(7):397-406

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Toxoplasmosis in the muscrat Ondatra zibethica (Linné) 1766 and in the stone marten Martes foina (Erxleben) 1777     

K Rasín 《Veterinární medicína》1971,16(4):255-260

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Evaluation of Duddingtonia flagrans in reducing infective larvae of Haemonchus contortus in feces of sheep.     

M T Pe?a  J E Miller  M E Fontenot  A Gillespie  M Larsen 《Veterinary parasitology》2002,103(3):259-265

Consequences of nematode infections due to Haemonchus contortus are a serious constraint for the sheep industry worldwide. Development of anthelmintic resistance and increasing concern about the impact of anthelmintic use dictate the need of alternative control. Such an alternative is using the nematode trapping fungus Duddingtonia flagrans to reduce infective larvae levels on pasture. Two trials were conducted to determine the effect of D. flagrans in reducing infective larvae (predominantly H. contortus) in feces. The first trial determined the dose effect of D. flagrans in reducing infective larvae in feces. Eighteen ewes were dewormed to remove existing infections and randomly assigned to six treatment groups: 5 x 10(4), 1 x 10(5), 2.5 x 10(5), 5 x 10(5), 1 x 10(6) or no (control) spores of D. flagrans per kg of body weight mixed in their feed for 7 days. Fecal samples were collected daily from these and from infected donor ewes. Feces from individual-treated ewes were mixed with equal amounts of donor ewe feces, theoretically approximating oral dose spore concentrations of 2.5 x 10(4), 5 x 10(4), 1.25 x 10(5), 2.5 x 10(5), 5 x 10(5) and no spores, and were cultured. Across dosages and during the 7 days of fungus feeding, percent reduction of infective larvae ranged from 76.6 to 100.0%. The second trial determined the effect of D. flagrans at the dose of 10(5) spores per kg body weight on reducing infective larvae in feces from naturally infected lambs. Twenty lambs were randomly assigned to either treatment or control groups based on fecal egg count. Treatment lambs were fed spores mixed in feed for 7 days. Feces were collected daily and cultured. During the 7 days of fungus feeding, the percent reduction of infective larvae ranged from 82.8 to 99.7%. Results of these trials demonstrated that the nematode trapping fungus D. flagrans was highly effective in reducing infective larvae in sheep feces and should be considered as a biological control agent for integrated nematode control programs.  相似文献   

Experimental poisoning of pheasant chicks with nitrates and nitrites in drinking water     

Z Strnad  M Persín 《Veterinární medicína》1983,28(9):541-547

The effect was studied of nitrates and nitrites in drinking water on the methemoglobin level in blood and pathomorphological changes in fourteen-day-old pheasant chickens. The concentrations of 500 ppm of NO3- and 15 ppm NO2- in the drinking water were not lethal, they caused only the increase in the methemoglobin in blood to 7.1% (NO3-) and 16.5% (NO2-). The pheasants exposed to NO3- suffered from hyperaemia of liver, kidneys and mucosa of the small intestine and from the multiplication of the eosinophilic granulocytes in the villus stroma. The exposition to NO2- resulted in the non-specific dystrophic changes in liver and kidneys and in the villus edema of the small intestine. Lethal levels of nitrates and nitrites in drinking water were estimated in relation to the age of pheasants.  相似文献   

Effects of growth curve parameters on cow efficiency.     

G López de Torre  J J Candotti  A Reverter  M M Bellido  P Vasco  L J García  J S Brinks 《Journal of animal science》1992,70(9):2668-2672

Weight-age data from 50 Retinta beef cows from 8 to 97 mo of age located in southwestern Spain were fitted to von Bertalanffy, Brody, and Richards functions to determine the relationship between growth curve parameters and cow efficiency. Only cows having at least 31 weights were included in the analysis. Von Bertalanffy, Brody, and Richards functions were fitted to weights of each cow. Relevant parameters of the three functions are A and K, associated with the asymptotic mature weight and rate of maturing, respectively. Criteria for comparisons among the three functions were computing difficulty, goodness of fit, and lack of bias of A. Productivity indicators were number of calves weaned during the first five calving seasons (NC), average birth weight (BWT), average weaning weight (WW), and average weaning weight per cow per year (WWY). The von Bertalanffy function was selected as the most appropriate. Least squares means for A and K were 650 +/- 8.17 kg and .038 +/- .001 mo-1, respectively. The values of NC, BWT, WW, and WWY were 4.0 +/- .11 calves, 38.2 +/- .4 kg, 218 +/- 5 kg, and 172 +/- 5 kg, respectively. Regression analysis for A indicated a decrease in NC when mature weight increased (P less than .05). There was a nonsignificant trend for heavier cows (higher A) to have calves with heavier BWT or WW. The value of WWY increased (P less than .05) with increased maturing rate (K) of cows. No significant associations were found between K and BWT or WW.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Characteristics of the cumulus-oocyte complex during the preovulatory period in superovulated heifers]     

J Laurincík  M Oberfranc  J Pivko  P Grafenau  E Kubovicová 《Veterinární medicína》1992,37(3):141-147

The nature of cumulus--oocyte complexes was examined in PMSG (group 1, n = 18) and FSH (group 2, n = 30) stimulated heifers. Laparoscopy was performed 65 h after cloprostenol application. The number of follicles was 13.67 +/- 0.75 and 12.67 +/- 0.81 (P greater than 0.05) in group 1 and 2, respectively (Tab. I). The recovery rate of oocytes was 56% in the first and 67% in the second group (Tab. I). The cumulus oophorus was divided into three groups: compact, expanded and partial (Tab. II). Most oocytes (65 and 75% in the first and second group, respectively) exhibited an expanded cumulus (P greater than 0.05). In the first and second group 11 and 26% (P less than 0.01) of oocytes with the extruded first polar body were aspirated (Tab. III). As judged from the pool of visible follicles, the superovulation response to stimulatory treatment and recovery rate of oocytes in the present experiment were not different from the results published earlier. The degree of the cumulus oophorus expansion is an indicator for the evaluation of cumulus--oocyte complexes. After the preovulatory LH peak the disintegration of cumulus oophorus proceeds from glycosaminoglycan accumulation. In our experiment this effect resulted in a significantly higher number of oocytes with expanded cumulus in both treatments. The enlargement of perivitelline space is related to a subsequent release of the first polar body in the preovulatory period. It can be seen from our results that after FSH treatment it is possible to reach the high number of oocytes with the extruded polar body.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

The effect of zeranol on muscle structure and the development of the testes in bulls     

V Uhrín  J Kica 《Veterinární medicína》1989,34(4):203-212

The effect was investigated of the Ralgro preparation with the active substance zeranol on histological and histochemical properties of bull muscles. The anabolic effect was displayed by a trend toward greater thickness of muscle fibres in m. longissimus thoracis, m. semitendinosus and m. triceps brachii, whilst differences between the muscles of experimental and control animals were not statistically significant. The bulls administered zeranol had the higher proportions as well as the higher relative volumes of white (aW) muscle fibres, but neither were these differences statistically significant in comparison with the control. The growth and development of testicles are inhibited by zeranol. The inhibition is significant and persists during 30 days after the last administration. Later on, the rate of development and growth are increased with the testicles reaching the weight of the sexual glands of control animals in 90 days after the last administration; the coiled seminiferous tubules grow and spermiogenesis occurs.  相似文献   

Comparative study of embryonal development in 2 oviparous and 1 ovoviviparous species (Gallus gallus, Coturnix c. japonica and Liolaemus tenuis t.)     

P Lemus  R Martín  M J Blánquez  M Fuenzalida  J Illanes 《Anatomia, histologia, embryologia》1984,13(3):252-260

In a study of the development of two oviparous species (domestic chicken and Japanese quail) and one ovoviviparous species (a common lizard), the relationship to alterations in egg size and weight during incubation was examined. It was observed, as reported by others that the avian egg diminishes in size during incubation, but that the lizard egg increases in size and weight. This investigation examines these relationships and suggests that the increase in the size and weight of the lizard egg is a result of an increase of liquid content. The mechanism is discussed.  相似文献   

The present status and prognosis of residual analytical chemistry     

P Skarka  I Sestáková  B Sevcík 《Veterinární medicína》1987,32(9):571-576

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Comparison of immunity produced by B. melitensis Rev. 1 and B. abortus strain 19 in guinea pigs challenged a month nd a year after vaccination     

C García-Carrillo 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1986,33(3):231-236

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