1.
J Am Vet Med Assoc
; 223(5): 628-34, 2003 Sep 01.
Artigo
em Inglês
| MEDLINE
| ID: mdl-12959380
Assuntos
Fenômenos Fisiológicos da Nutrição Animal , Bovinos/fisiologia , Proteínas Alimentares/metabolismo , Fertilidade/genética , Leite/metabolismo , Ração Animal , Animais , Nitrogênio da Ureia Sanguínea , Bovinos/sangue , Bovinos/genética , Proteínas Alimentares/administração & dosagem , Feminino , Fertilidade/efeitos dos fármacos , Fertilidade/fisiologia , Lactação/genética , Lactação/fisiologia , Leite/química , Gravidez , Taxa de Gravidez , Rúmen/metabolismo , Ureia/análise
2.
Prev Vet Med
; 60(3): 237-41, 2003 Aug 28.
Artigo
em Inglês
| MEDLINE
| ID: mdl-12900161
RESUMO
Our objective in this cross-sectional study was to determine the seroprevalence in 1996 of commercial dairy herds in central Chile positive to bovine viral diarrhea (BVD) virus, by the detection of antibodies in bulk-tank milk samples. Samples were obtained from 501 dairy farms ( approximately 50,000 cows) from the Metropolitan, VI, VII and VIII regions of Chile. An indirect ELISA was used to detect BVD antibodies. An absorbance (A450) > or = 0.55 was considered positive. The apparent proportion of positive herds ranged from 71.2 to 83% by region and did not differ by region. We concluded that exposure to BVD was widely distributed in the central area of Chile in 1996.
