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VetMed Resource

Veterinary information to support practice, based on evidence and continuing education

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Abstract

In Hertfordshire, UK, 60 beef cattle (12 first-season and 48 2nd-season grazing animals) were divided into 3 groups according to age and body weight. Half of each group was given, before turnout, a morantel sustained-release bolus and the rest served as untreated controls. The groups were moved...

Author(s)
Jacobs, D. E.; Fox, M. T.; Jones, R. M.; Bliss, D. H.
Citation
Veterinary Record, 1982, 110, 17, pp 399-402
Abstract

Endocrine effects of a single dose of 100 000 infective O. ostertagi larvae in the calf were investigated. Changes in hormone levels reflecting digestive, thyroid, adrenal and pituitary function were monitored using radioimmunoassay techniques previously validated for use in cattle. A significant...

Author(s)
Fox, M. T.; Gerrelli, D.; Pitt, S. R.; Jacobs, D. E.; Hart, I. C.; Simmonds, A. D.
Citation
International Journal for Parasitology, 1987, 17, 6, pp 1181-1185
Abstract

In a 2-year trial involving successive batches of 36 autumn-born steers on two adjacent sites, calves treated with ivermectin at three and eight weeks after turn out contaminated pastures much less than untreated control animals. Each year dry summers prevented the larval challenge on the control...

Author(s)
Jacobs, D. E.; Fox, M. T.; Ryan, W. G.
Citation
Veterinary Record, 1987, 120, 2, pp 29-31
Abstract

The effect of diet on the gastrin response to a trickle infection with O. ostertagi in the calf was investigated in 2 experiments. Peak hormone levels in infected calves fed hay alone were nearly double those found in animals kept on a largely concentrate diet. This was explained by reference to...

Author(s)
Fox, M. T.; Pitt, S. R.; Gerrelli, D.; Jacobs, D. E.
Citation
International Journal for Parasitology, 1988, 18, 4, pp 547-548
Abstract

Blood gastrin and pepsinogen responses to a single infection with 100 000 O. ostertagi infective larvae in lactating dairy cows were investigated. None of the 5 infected cows showed signs of clinical ostertagiasis, nor was there any difference in live weight gain, milk yield or faecal egg count...

Author(s)
Pitt, S. R.; Fox, M. T.; Gerrelli, D.; Jacobs, D. E.
Citation
Research in Veterinary Science, 1988, 45, 1, pp 130-131
Abstract

Twenty 3-month-old calves were infected with 100 000 Ostertagia ostertagi on day 0, and then with the equivalent of 10 000/day, given 3 times a week. The calves were treated with fenbendazole (Panacur) before infection and 4-5 months after the start of the experiment. Increased pepsinogen levels...

Author(s)
Fox, M. T.; Pitt, S. R.; Gerrelli, D.; Jacobs, D. G.
Publisher
Elsevier Applied Science Publishers Ltd., Barking, Essex, UK
Citation
Immunoassays for veterinary and food analysis - 1., 1988, pp 293-297
Abstract

Previous work has shown blood gastrin levels to be elevated and appetite depressed in Ostertagia-infected calves. A possible relationship between raised blood gastrin values and feed intake was investigated in worm-free animals using the human gastric acid secretion inhibitor, omeprazole. An...

Author(s)
Fox, M. T.; Gerrelli, D.; Shivalkar, P.; Jacobs, D. E.
Citation
Research in Veterinary Science, 1989, 46, 2, pp 280-282
Abstract

The effects of a trickle challenge with the equivalent of 10 000 infective O. ostertagi larvae per day on appetite, digestibility, rate of passage of digesta and liveweight gain were investigated in 12 calves assigned to infected, pair-fed control and ad libitum-fed control groups. Digestibility of ...

Author(s)
Fox, M. T.; Gerrelli, D.; Pitt, S. R.; Jacobs, D. E.; Gill, M.; Gale, D. L.
Citation
Research in Veterinary Science, 1989, 47, 3, pp 294-298
Abstract

Metabolic effects of a trickle challenge with the equivalent of 10 000 infective O. ostertagi larvae per day were investigated in 12 calves allocated to infected, pair-fed control or ad libitum-fed control groups. Changes in hormone levels reflecting abomasal, pituitary and pancreatic function were ...

Author(s)
Fox, M. T.; Gerrelli, D.; Pitt, S. R.; Jacobs, D. E.; Gill, M.; Simmonds, A. D.
Citation
Research in Veterinary Science, 1989, 47, 3, pp 299-304
Abstract

Non-esterified fatty acid (NEFA) levels in housed, 3-month-old calves were monitored in 2 experiments designed to establish (i) the effect of diet and time of sampling in relation to feeding on blood levels; and (ii) the relationship between appetite and plasma NEFA in animals on chopped hay. In...

Author(s)
Fox, M. T.; Gerrelli, D.; Pitt, S. R.; Jacobs, D. E.
Citation
Veterinary Research Communications, 1991, 15, 2, pp 127-133

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