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Biomedical subjects

J Ríha

Publications and source records attributed to J Ríha.

32 records · Page 2Linked to original sources
PubMed1979

Losses in milking qualities of dairy cattle caused by mosquitoes and horseflies and reduction of such losses due to use of diethyltoluamide repellent.

An experiment was carried out in South Bohemia, in which 10% water emulsion of diethyltoluamide was used as repellent against bloodsucking Diptera to protect pastured dairy cattle. The repellent was applied by means of a spraying frame and was effective for 30-36 hours. Seven mosquito species and 18 horsefly species were observed to be attacking the cattle. The average number being 120-300 mosquitoes and 50 horseflies per hour, the milking qualities in the cattle decreased by 6.2%, the milk fat content by 11.8%. After converting to milk with average fat content of 4%, the difference in milking qualities between treated and untreated animals was 9.7%.

Aerosols↗
PubMed1979

[Synchronization of estrus in heifers using Chlorsuperlutin (CSL) vaginal tampons].

A pilot experiment with heifer heat synchronization with chlorsuperlutin-soked intravaginal tampons was conducted with 254 heifers in six herds in the North Moravian region. The rubber-foam tampons, cylindrical in shape (diameter 70 mm, height 70-90 mm), were introduced into the cranial part of the vagina, using an applicator and a vaginal speculum. Sixteen days after introduction, the tampons were removed by pulling the silon thread with which the tampons were cross-stitched. The heifers were inseminated on the second to fifth day after the removal of the tampons. The average performance in the application of the tampons was 38.5 tampons per hour, and in their removal 20.7 tampons per hour. The retention rate of the tampons was 97.6%; out of this, 79.8% of the tampons were pulled out by the silon thread. The signs of heat were good, 87.9% of the heifers could be inseminated intrauterinally. All the heifers with retained tampons were inseminated. The conception rate after the first insemination was 32.7%, after the second insemination 56.4%, and after two inseminations 68.1%. Out of the synchronized heifers, 8.1% were culled for slaughter. The drawbacks of this treatment include the low conception rate of the synchronized heifers, a high requirement for repeated insemination in the synchronized oestrus, and, consequently, a high sperm consumption.

Animals↗
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

[Economic problems in the control of transmissible gastroenteritis of swine].

The losses ascribable to transmissible gastroenteritis of pigs were financially determined at eight sites with 133-1269 large animal units, as converted to pig stocks. The overall losses were divided as follows: mortality and confiscation - 42.38%, weight gain reduction - 30.50%, extra costs of the enterprise - 13.11%, emergency slaughters 7.79%, and losses in progenies 6.22%. The coefficient of loss per one diseased animal was 42.63 to 114.65 crowns. Furthermore, the level of the assumed losses due to mortality and morbidity prevented by veterinary measures was also calculated. The calculation of the effectiveness of these measures showed that 3.14--60.01 crowns are saved per 1 crown spent. The total number of losses, loss coefficient per one diseased animal, the level of prevented loss, and the money saved per 1 crown were calculated from the over-all societal viewpoint and from the viewpoint of the agricultural enterprise after the detraction of the indemnities from the State Insurance Company.

Abattoirs↗