Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Genetic parameters of milk production and trichostrongyle resistance phenotypes in the Churra population

Nematode resistance:
Based in the previous experience sampling routine was established in 8 farms, with two visits. In the first day we take faeces samples and after the sample collection an anthelmintic product is administrated in order to make sure that each egg count represents distinct infections.

In a second visit performed 60 days after treatment animals are sampled for blood and faeces. The experimental design includes two visits for each farm; in the first visit the experimental animals were selected and identified previously to faecal sampling.

After that all the animals were dewormed with an anthelmintic drug considered the most appropriate after a survey in the flocks. These animals were faecal and blood re-sampled 60 days later.

Parameters measured for resistancwe to parasites were: FEC in first visit to farm (FEC0), the same parameter 60 days after FEC FEC1, pepsinogen level in serum and IgA levels.

Heritability and repeatability values for nematode parasite resistance were: LFEC0 (0.12);

LFEC1 (0.09); PEPSI (0.21); IgA (0.19).

Results presented here are of scientific importance because is the first time that this phenotypes are studied in Churra population.

In a future with some confirmation they can also be used in practical breeding programmes. The results are public and will be published.

Reported by

Universidad de Leon
Dpto Produccion Animal
24071 Leon
Spain