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The relationship between the number and size of nematodes in the abomasum and the concentration of pepsinogen in ovine plasma
(1999-08)
Six-month-old lambs that had been naturally infected with predominantlyTeladorsagia (Ostertagia) circumcinctawere tested for plasma pepsinogen concentrations because pepsinogen concentrations may reflect the extent of ...
The distribution of pepsinogen within the abomasa of cattle and sheep infected with Ostertagia spp. and sheep infected with Haemonchus contortus
(1999-03-31)
The effect of nematode infections on the production of pepsinogen by ruminants was investigated immunohistochemically and biochemically. Abomasal tissues were collected from parasite-naive cattle and sheep, from sheep ...
The processes influencing the distribution of parasitic nematodes among naturally infected lambs
(1998-08)
The impact of mixed, nematode infection upon a group of animals will depend upon the number of nematodes present, how they are distributed among hosts and whether individuals that are heavily parasitized with one species ...
Changes in the zymogenic cell populations of the abomasa of sheep infected with Haemonchus contortus
(1998-06)
The effects of dietary urea supplementation and of a 10-week trickle infection regime, simulating chronic exposure to Haemonchus contortus, on the zymogenic population of the abomasa of Hampshire Down lambs was examined, ...
How hosts control worms
(1997-09-04)
Nematodes are a major cause of disease and death in humans, domestic animals and wildlife. Understanding why some individuals suffer severely whereas others exposed to the same infection remain healthy may assist in the ...
The genetic basis of resistance to Ostertagia circumcincta in lambs
(1997-09)
The relationship between Ostertagia (Teladorsagia) circumcincta and sheep is one of the best understood host-parasite relationships in any species. The key components of resistance have been quantified, the extent of genetic ...
Genetic parameters for faecal egg count following mixed, natural, predominantly Ostertagia circumcinta infection and relationships with live weight in young lambs
(1996-12)
Faecal egg counts and live weights were measured on approximately 200 predominantly twin-born Scottish Blackface lambs each year for 3 years, from 2 to 6 months of age. Measurements were made at 4-week intervals following ...
An ovine lymphocyte antigen is associated with reduced faecal egg counts in four-month-old lambs following natural, predominantly Ostertagia circumcincta infection
(1996-04)
Ten lymphocyte antigens were defined in a flock of Scottish Blackface sheep known to be naturally exposed to infection with Ostertagia circumcincta. Population and family studies suggested that the 10 antigens were products ...
Comparison of four methods for the determination of plasma pepsinogen concentration
(1995-11)
Four methods for estimating plasma pepsinogen concentrations were compared to determine the most suitable for routine use. Three of the methods were colorimetric assays which used glycine-buffered albumin, albumin, or ...
An ovine Major histocompatibility complex DRB1 allele is associated with low faecal egg counts following natural, predominantly Ostertagia circumcincta infection
(1995-07)
Infection with Ostertagia circumcincta is a major constraint on sheep production in temperate areas of the world. A potential control strategy is the use of genetically resistant sheep. Therefore we examined the association ...