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Quantitative estimation of the impact of caprine arthritis encephalitis virus infection on milk production by dairy goats

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URI
http://hdl.handle.net/20.500.11939/5606
DOI
10.1016/j.tvjl.2012.12.020
Derechos de acceso
openAccess
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Author
Martinez-Navalon, Bernardo; Peris-Ribera, Cristòfol; Gómez, Ernesto A.; Peris, Bernat; Luz Roche, Maria; Caballero, Concepcion; Goyena, Elena; Berriatua, Eduardo
Date
2013
Cita bibliográfica
Martinez-Navalon, B., Peris, C., Gomez, E.A., Peris, B., Luz Roche, M., Caballero, C., Goyena, E., Berriatua, E. (2013). Quantitative estimation of the impact of caprine arthritis encephalitis virus infection on milk production by dairy goats. Veterinary Journal, 197(2), 311-317.
Abstract
This retrospective study investigated milk production losses associated with serological evidence (serostatus) of caprine arthritis encephalitis virus (CAEV) infection over one lactation in 4543 Murciano-Granadina goats from 22 herds in Spain. The seroprevalence of infection was 18%, ranging from 0% to 2% in 11 herds, 7% to 60% in 10 herds and was 100% in one herd. Seropositive does had significantly shorter lactations, produced less milk and milk fat, lactose and dry extract and had higher somatic cell counts than their seronegative counterparts, although differences in milk production between seropositive and seronegative animals were noted between herds. Mixed regression models confirmed the association between CAEV seropositivity and reduced milk production. The adjusted, least squares mean (LSM) test-day milk yield was 10% less in seropositive compared to seronegative does and this difference varied according to lactation number. In contrast, differences in the LSM of milk fat, lactose and dry extract percentages between seropositive and seronegative goats were only between 0.1% and 0.2% and did not increase with lactation number. The findings of this study provide strong evidence that CAEV-infection can be a major cause of reduction in milk yield in goats and its control should be considered as part of dairy goat herd health schemes. (C) 2013 Elsevier Ltd. All rights reserved.
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