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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
09/10/2008 |
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Data da última atualização: |
25/06/2025 |
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Autoria: |
SMITH, M. C.; CUTLIO, R. |
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Título: |
Effects of infection with caprine arthritis-encephalitis virus on milk production in goats. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
Journal of the American Veterinary Medical Association, v. 193, n. 1, p. 63-69, 1988. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: A recently assembled commercial herd of Alpine goats was studied. Milk production criteria—305-day milk production (m), butter fat content (bf), and solids nonfat content (snf)—and somatic cell counts (linear score) were monitored by Dairy Herd Improvement Association test records. Milk samples from all milking goats in the herd were obtained for bacteriologic culture for mastitis organisms on 2 occasions; the infection rate ascribed to major pathogens was 3%. In November 1985, serum specimens were obtained from 154 does in first lactation. Of these, 56 (36%) were seropositive for caprine arthritis-encephalitis (cae) antibodies by agar gel immunodiffusion (agid), 91 (59%) were seronegative, and serotest results for 7 (5%) were inconclusive. In December, 80 seronegative and 48 seropositive goats remained in the herd and had 305-day projections available. The median production values for seronegative goats (1,539.5 lb of m, 52 lb of bf, 46 lb of snf) were higher than those for seropositive goats (1,446 lb of m, 45 lb of bf, 44.5 lb of snf), but this difference was only significant (t test, P<0.05) for bf. Does were ranked by a formula that combined m, bf, and snf, with a desired minimal daily herd average of 5 lb of m, 3% bf, and 3% snf. A decision was made not to keep off spring from does of the lowest quartile before cae test results were obtained. This group consisted of 13 of the 80 (16%) seronegative goats and 18 of the 48 (38%) seropositive goats. Thus, a positive cae test result by agid was associated (X2, P<0.01) with poor production. In addition, positive cae test results were associated (P<0.005) with nonhemolytic staphylococcal infection in the udder, and staphylococci-infected goats tended to produce more m, bf, and snf than did uninfected goats. A relationship could not be found between udder firmness on palpation during midlactation and cae, bacteriologic mastitis status, or milk production. For goats still in their first lactation in May (mean days in lactation, 370), 11 of 60 (18%) were infected with nonhemolytic staphylococci, and staphylococcal infection and cae positive test results were associated positively with linear score. In second-lactation goats (mean days in lactation, 80), only 1 of 69 was infected with nonhemolytic staphylococci, and cae serotest status had no effect on linear score. MenosAbstract: A recently assembled commercial herd of Alpine goats was studied. Milk production criteria—305-day milk production (m), butter fat content (bf), and solids nonfat content (snf)—and somatic cell counts (linear score) were monitored by Dairy Herd Improvement Association test records. Milk samples from all milking goats in the herd were obtained for bacteriologic culture for mastitis organisms on 2 occasions; the infection rate ascribed to major pathogens was 3%. In November 1985, serum specimens were obtained from 154 does in first lactation. Of these, 56 (36%) were seropositive for caprine arthritis-encephalitis (cae) antibodies by agar gel immunodiffusion (agid), 91 (59%) were seronegative, and serotest results for 7 (5%) were inconclusive. In December, 80 seronegative and 48 seropositive goats remained in the herd and had 305-day projections available. The median production values for seronegative goats (1,539.5 lb of m, 52 lb of bf, 46 lb of snf) were higher than those for seropositive goats (1,446 lb of m, 45 lb of bf, 44.5 lb of snf), but this difference was only significant (t test, P<0.05) for bf. Does were ranked by a formula that combined m, bf, and snf, with a desired minimal daily herd average of 5 lb of m, 3% bf, and 3% snf. A decision was made not to keep off spring from does of the lowest quartile before cae test results were obtained. This group consisted of 13 of the 80 (16%) seronegative goats and 18 of the 48 (38%) seropositive goats. Thus, a posit... Mostrar Tudo |
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Palavras-Chave: |
Artitre encefalite caprina; Caprino leiteiro; Physiopathology. |
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Thesagro: |
Artrite; Doença animal; Infecção; Produção leiteira; Vírus. |
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Thesaurus Nal: |
Arthritis; Caprine arthritis encephalitis virus; Goat diseases; Goats; Infectious diseases; Lactation; Milk production; Pregnancy; Somatic cell count. |
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Categoria do assunto: |
H Saúde e Patologia |
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Marc: |
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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