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First report of bovine neosporosis in dairy cattle in Costa Rica
(British Veterinary Association, 1998-05-09)
NEOSPOROSIS has recently been recognised as a major cause of
abortion in dairy cattle worldwide (Barr and others 1990, Duff
and Otter 1994, Boulton and others 1995). The disease is caused
by the protozoan parasite, ...
Event-time analysis of reproductive traits of dairy heifers
(Elsevier, 1998-11)
Data on the reproductive traits of dairy heifers
were analyzed using event-time techniques. Traits
analyzed were age at first calving (n = 4631), days to
first breeding, and days open (n = 1992) during the
first ...
Analysis of test day yield data of Costa Rican dairy cattle
(Elsevier, 1998)
Estimates of variance components for test day
records in an animal model that considered multiple
traits over multiple lactations were calculated using
REML methodology. Test day records were classified
into 11 periods ...