Co-Authors:
Leitner, G., National Mastitis Reference Center, Kimron Veterinary Institute, P.O. Box 12, Bet Dagan, 50250, Israel
Krifucks, O., National Mastitis Reference Center, Kimron Veterinary Institute, P.O. Box 12, Bet Dagan, 50250, Israel
Weisblit, L., National Mastitis Reference Center, Kimron Veterinary Institute, P.O. Box 12, Bet Dagan, 50250, Israel
Lavi, Y., P.O. Box 322, Sha'ar Efraim 42835, Israel
Bernstein, S., A.R.O., Department of Food Science, The Volcani Center, P.O. Box. 6, Bet Dagan, 50250, Israel
Merin, U., A.R.O., Department of Food Science, The Volcani Center, P.O. Box. 6, Bet Dagan, 50250, Israel
Abstract:
Three consecutive years of monitoring 248 goats in the same flock, found that the first lactation milk yield was significantly higher in seronegative (578 L) than in seropositive (447 L) animals but this difference disappeared in the subsequent second to fourth lactations. No significant differences were found in the proportions of seronegative and seropositive does in the flock, the percentage of animals culled, the number of offspring, or in the number of cases of udder bacterial infection, irrespective of age. Removal of kids from their dams before suckling and the feeding of pasteurised colostrum resulted in reduced numbers of seropositive animals. Nevertheless, by approximately 24 months of age, 76.9% of these initially seronegative animals were seropositive, a factor that significantly contributed to flock seropositivity. This finding could be attributed to lateral virus transmission from seropositive to seronegative kids because of lack of segregation within the flock. © 2008 Elsevier Ltd. All rights reserved.
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