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Título
Evolución de un programa de inseminación en la raza Assaf en la provincia de León
Autor
Facultad/Centro
Área de conocimiento
Datos de la obra
XXXIX Jornadas de Estudio. XIII Jornadas sobre Producción Animal. T. II
Editor
Asociación Interprofesional para el Desarrollo Agrario
Fecha
2009
Resumo
The Assaf breed has mostly been allocated in Castilla y León, particularly in
the province of León. In 1998, a selection and genetic improvement programme was initiated
for milk production in 38 flocks. Training of rams for semen collection using an artificial
vagina reached a success rate of 74%, and the percentage of valid ejaculates has reached
90%. Fertility results of artificial insemination (lambing rates) have fluctuated between 35% y
40% since the programme was started. We found that fertility drops in ewes older than 4
years, and that it improved about 10% in the breeding season.
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