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Non-invasive indicators associated with the milk yield response after anthelmintic treatment at calving in dairy cows

Sien Verschave (UGent) , Jozef Vercruysse (UGent) , Andrew Forbes, Geert Opsomer (UGent) , Miel Hostens (UGent) , Luc Duchateau (UGent) and Johannes Charlier (UGent)
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Abstract
Background: Gastrointestinal nematodes are an important cause of reduced performance in cattle. Previous studies in Europe showed that after anthelmintic treatment an average gain in milk production of around 1 kg per day/cow can be expected. However, (1) these studies have mainly evaluated group-based anthelmintic treatments during the grazing season or at housing and (2) little is known about parameters affecting variations in the treatment response amongst cows. A better knowledge of such parameters could help to select animals that benefit most from treatment and thus lead to a more rational use of anthelmintics. Therefore, a randomized, non-blinded, controlled clinical trial was performed on 11 commercial dairy farms (477 animals) in Belgium, aiming (1) to study the effect of eprinomectin treatment at calving on milk production and (2) to investigate whether the milk yield response was related to non-invasive animal parameters such that these could be used to inform targeted selective treatment decisions. Results: Analyses show that eprinomectin treatment around calving resulted in an average (+/- standard error) increase of 0.97 (+/- 0.41) kg in daily milk yield that was followed up over 274 days on average. Milk yield responses were higher in multiparous compared to primiparous cows and in cows with a high (4th quartile) anti-O. ostertagi antibody level in a milk sample from the previous lactation. Nonetheless, high responses were also seen in animals with a low (1st quartile) anti-O. ostertagi antibody level. In addition, positive treatment responses were associated with higher faecal egg counts and a moderate body condition score at calving (2nd quartile). Conclusions: In conclusion, this study provides novel insights into the production response after anthelmintic treatment at calving and factors which influence this. The data could be used to support the development of evidence-based targeted selective anthelmintic treatment strategies in dairy cattle.
Keywords
Eprinomectin, Faecal egg counts, TARGETED SELECTIVE TREATMENT, GASTROINTESTINAL NEMATODE INFECTIONS, OSTERTAGIA-OSTERTAGI ELISA, EPRINOMECTIN TREATMENT, STOCKING MANAGEMENT, GRAZING BEHAVIOR, CATTLE, HERDS, SHEEP, PARAMETERS, Anti-O. ostertagi antibody level, Targeted selective treatment, Gastrointestinal nematodes, Dairy cattle

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Chicago
Verschave, Sien, Jozef Vercruysse, Andrew Forbes, Geert Opsomer, Miel Hostens, Luc Duchateau, and Johannes Charlier. 2014. “Non-invasive Indicators Associated with the Milk Yield Response After Anthelmintic Treatment at Calving in Dairy Cows.” Bmc Veterinary Research 10.
APA
Verschave, S., Vercruysse, J., Forbes, A., Opsomer, G., Hostens, M., Duchateau, L., & Charlier, J. (2014). Non-invasive indicators associated with the milk yield response after anthelmintic treatment at calving in dairy cows. BMC VETERINARY RESEARCH, 10.
Vancouver
1.
Verschave S, Vercruysse J, Forbes A, Opsomer G, Hostens M, Duchateau L, et al. Non-invasive indicators associated with the milk yield response after anthelmintic treatment at calving in dairy cows. BMC VETERINARY RESEARCH. 2014;10.
MLA
Verschave, Sien, Jozef Vercruysse, Andrew Forbes, et al. “Non-invasive Indicators Associated with the Milk Yield Response After Anthelmintic Treatment at Calving in Dairy Cows.” BMC VETERINARY RESEARCH 10 (2014): n. pag. Print.
@article{5848248,
  abstract     = {Background: Gastrointestinal nematodes are an important cause of reduced performance in cattle. Previous studies in Europe showed that after anthelmintic treatment an average gain in milk production of around 1 kg per day/cow can be expected. However, (1) these studies have mainly evaluated group-based anthelmintic treatments during the grazing season or at housing and (2) little is known about parameters affecting variations in the treatment response amongst cows. A better knowledge of such parameters could help to select animals that benefit most from treatment and thus lead to a more rational use of anthelmintics. Therefore, a randomized, non-blinded, controlled clinical trial was performed on 11 commercial dairy farms (477 animals) in Belgium, aiming (1) to study the effect of eprinomectin treatment at calving on milk production and (2) to investigate whether the milk yield response was related to non-invasive animal parameters such that these could be used to inform targeted selective treatment decisions. 
Results: Analyses show that eprinomectin treatment around calving resulted in an average (+/- standard error) increase of 0.97 (+/- 0.41) kg in daily milk yield that was followed up over 274 days on average. Milk yield responses were higher in multiparous compared to primiparous cows and in cows with a high (4th quartile) anti-O. ostertagi antibody level in a milk sample from the previous lactation. Nonetheless, high responses were also seen in animals with a low (1st quartile) anti-O. ostertagi antibody level. In addition, positive treatment responses were associated with higher faecal egg counts and a moderate body condition score at calving (2nd quartile).
Conclusions: In conclusion, this study provides novel insights into the production response after anthelmintic treatment at calving and factors which influence this. The data could be used to support the development of evidence-based targeted selective anthelmintic treatment strategies in dairy cattle.},
  articleno    = {264},
  author       = {Verschave, Sien and Vercruysse, Jozef and Forbes, Andrew and Opsomer, Geert and Hostens, Miel and Duchateau, Luc and Charlier, Johannes},
  issn         = {1746-6148},
  journal      = {BMC VETERINARY RESEARCH},
  language     = {eng},
  pages        = {10},
  title        = {Non-invasive indicators associated with the milk yield response after anthelmintic treatment at calving in dairy cows},
  url          = {http://dx.doi.org/10.1186/s12917-014-0264-x},
  volume       = {10},
  year         = {2014},
}

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