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Results for “Hypodermyiasis”

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At least 19 recordsLinked to original sources
PubMed1978

[Effect of hypodermyiasis in cattle on milk-production indicators in 1st-calvers].

We investigated the effect of hypodermosis on the quantitative and some qualitative indicators of milk from 20 experimental and 18 control first-calvers of the Pinzgau cattle breed. The experiment took place at two experimental localities in mountainous pastures of the Central-Slovakian region. In the experimental animals, treated with Hypocid, the production of milk per dairy cow increased on an average by 115.98 kg, i.e. 24.83%, over the experimental period of 61 days (May, June) with an average invasion intensity of 5.94 larvas in control animals. Milk fat production increased on an average by 7.20 kg, i.e. 34.97%. Production recalculated to FCM milk amounted on an average to 31.61%. The profitability of treating hypodermosis with the Hypocid preparation is expressed by the average savings of 0.40 Kcs per litre of milk per day.

Animals↗
PubMed1977

[Therapy of hypodermyiasis in heifers from the economic point of view].

The test set of animals consisted of sixty one- to two-year-old heifers of the Slovak Spotted and Pinzgau breeds kept at three sites. The Hypocid preparation (containing 40% trichlorphon) in the dose of 15 ml per 100 kg of live weight was applied to these cows by the lavage method in the sacrolumbar region of the spine in 1973. Another group, consisting of 58 heifers, was left untreated as controls. In the experimental period extending over 158, 150 and 120 days at different sites (143 days on an average), weight gains and the health condition of the experimental and control animals were checked in monthly intervals. The average extensity of invasion in the control heifers was 79.31% and the intensity of invasion was 14.58%. The extenseffectiveness of Hypocid (EE) was 97.90% and the intenseffectiveness of the preparation (IE) was 99.99%. The results prove a negative effect of hypodermatosis on the weight gains of untreated heifers and high profitability of the therapy: after subtraction of the costs of therapy the savings were 1.74, 3.88 and 2.25 crowns per kg gain per day (2.62 crowns on an average). The veterinary measures gave the following savings per each crown expended: 2,243.55; 3,066.85 and 922.83 crowns (depending on site).

Animals↗
PubMed1975

[The larval development of the warble-fly Oestromyia leporina Pall. (Deptera, Hyodermah'dae) (author's transl)].

The present paper deals with the larval development of the warble-fly Oestromyia leporina and especially with the development of the first instar larvae (L 1). The hatching from the egg and the modus of infection is described. The migration of the L 1 within the host is reported for the first time as well as the perforation of the skin after the migration period. Exact dates on the duration of the different larval stages are given. Experimental infection reveals a partial immunization of the host against new infections. Some remaining problems of larval biology are discussed. By comparison several facts suggest our present knowledge of the perforation of larval (L 1) Hypoderma bovis probably to be wrong.

Animals↗
PubMed1975

[Cultivation of the warble-fly Oestromyia leporina pall. (Diptera, Hypodermatidae) and its biological prerequisites (author's transl)].

The warble-fly Oestromyia leporina was cultivated for four generations in the laboratory. In the present paper the technic of laboratory mating and the modus of experimental infection of the host are described. The fertility of females is tested by experiments and by dissections. It is shown how the diapause of the puparia can be shortened and how it can be omitted. The successful infection of several species of small mammals demonstrates that O. leporina can be colonized not only on the natural host but also on some common laboratory animals like mice and rats.

Animals↗
PubMed1979

[Histological reactions of the host induced by the larvae of the warble-fly Oestromyia leporina Pall. (Diptera, Hypodermatidae) (author's transl)].

The histological reactions of Mastomys natalensis induced by the larvae of Oestromyia leporina are described from the start of the infection to the complete healing of the evacuated cyst. Against the migrating larva no cellular reactions take place. After the larva settles, the most obvious feature is a non-suppurative inflammation of the surrounding tissue, while a layer of granulation tissue, infiltrated with eosinophils, is built up around the parasite. About 13 days p.i. the number of eosinophils starts to decrease again. No giant cells are present; plasmocytes and lymphocytes are relatively scarce. A few days before the parasite leaves the host, the inner surface of the warble is infiltrated with masses of neutrophils, obviously caused by secondary invasion of bacteria through the warble opening. After the parasite leaves the host, the repair of the tissue takes place within three weeks. The remaining scar tissue contains cells carrying haemosiderin, which disappears entirely about two months later.

Animals↗
PubMed1978

The Warble Fly Orders.

The provisions and the operational aspects of the new Warble Fly Orders are described. The new Orders will apply between March 15 and July 31 and during this period owners of cattle showing visible or palpable signs of warbles must treat them with a systemic warble fly dressing. During this period no infested cattle may be moved, even to a slaughterhouse, unless they have been treated and are accompanied by a statutory declaration of treatment.

Animals↗
PubMed1976

On the regularities of distribution of Hypoderma bovis De Geer larvae parasitizing cattle herds in different parts of the range of this warble fly.

The type and parameters of the distribution of the second and third instar larvae of Hypoderma bovis in cattle herds in Czechoslovakia (54 herds, 7233 head), Mongolia (20 herds, 1809 head) and the USSR (48 herds, 4978 head) were studied. A statistical analysis showed a) that in the majority of cases negative binomial distribution serves as a model of the distribution of larvae with sufficient reliability; b) that the regularity of dependence of the distribution exponent k of the negative binomial distribution on the incidence of infestation remains constant in different parts of the range of this warble fly. The latter fact indicates that the regulatory systems limiting the population numbers of this warble fly are associated with host-parasite relationships and do not depend on a complex of conditions specific for various natural zones. In order to understand the regulatory processes in parasite populations it is necessary to study equally the regulatory mechanisms operating primarily on the level of specimens as well as the regulatory systems operating on the level of populations.

Animals↗