Abstract

ARANA, Carlos; RAMOS, Olger; LLAPAPASCA, Nidia  and  DELGADO, Alfredo. Study of late embryo mortality in dairy cattle from highland. Rev. investig. vet. Perú [online]. 2021, vol.32, n.3, e20417. ISSN 1609-9117.  http://dx.doi.org/10.15381/rivep.v32i3.20417.

Dairy cattle breeding in the high Andean regions is limited due to the hypoxic environment, which may affect embryonic survival. The present study aimed to determine late embryonic mortality (EM) (28-, 35and 42-days post-service) and its association with the number of calvings (0, 1, 2, 3, 4, >5) and milk yield (at 60 and 90 days) in Brown Swiss, Holstein and crossbred cows, under a semi-intensive rearing system at grazing in the Mantaro Valley (3300 meters above sea level). The overall late EM was 7% (14/203). An association was found between the number of calvings and the presentation of EM (r = 0.8), as well as between milk yield and EM (r = 0.9). The late ME in the cows of the Mantaro valley can be considered as low, and there would be a very close relationship with the factors of breed and parity.

Keywords : highlands; dairy cows; embryo mortality; Holstein; Brown; crossbreed.

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