PMID: 6406575Apr 1, 1983Paper

Effects of sarcocystosis on milk production of dairy cows

Journal of Dairy Science
R FayerL C Gasbarre

Abstract

Sixteen multiparous Holstein cows were allotted randomly to four groups of four cows each. Cows in 1 and 2 were uninfected. Those in 3 received 60,000 and those in 4 received 120,000 Sarcocystis bovicanis sporocysts per os approximately 30 days before the expected onset of lactation to produce nonclinical and clinical infections in 3 and 4, respectively. Combined stresses of infection, parturition, lactation, and high ambient temperatures caused all infected cows to develop clinical illness. Clinical signs included fever, anemia, glossitis, myositis, nasal discharge, hypersalivation, anorexia, and hind limb weakness; two cows died and two others were killed in extremis. Six cows in 3 and 4 developed high Sarcocystis-specific immunoglobulin G1 antibody. Uninfected control cows had no clinical signs and no rising concentrations of antibody against Sarcocystis antigen. When lactation began, cows were milked twice daily, and milk production was recorded for 70 consecutive days. All sarcocystis-infected cows (3 and 4) decreased feed intake and milk production compared with uninfected controls. The Wisconsin Mastitis Test on milk production compared with uninfected controls. The Wisconsin Mastitis Test on milk samples at 1, 2, 4, 8, ...Continue Reading

References

Sep 1, 1977·Veterinary Pathology·J A Schmitz, W W Wolf
May 1, 1982·Veterinary Pathology·J P Dubey, J A Bergeron

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Citations

Jan 8, 2009·The Korean Journal of Parasitology·Akbar ValinezhadNasrollah Ahmadi
Jan 1, 1987·Parasitology·P H Holmes
Mar 20, 2004·Journal of Veterinary Medicine. B, Infectious Diseases and Veterinary Public Health·D G W KalubowilaR P V J Rajapakse

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