Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production
Development of resistance to anthelmintic drugs has motivated the search for diagnostic methods to identify animals for targeted selective treatments. We compared three methods for the diagnosis of nematode infection in relation to milk production in a fully grazing dairy herd of 150 cows in the hum...
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2011
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03044017_v183_n1-2_p174_Mejia http://hdl.handle.net/20.500.12110/paper_03044017_v183_n1-2_p174_Mejia |
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paper:paper_03044017_v183_n1-2_p174_Mejia2023-06-08T15:29:45Z Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production Anti-Ostertagia antibody Dairy cattle EPG Gastrointestinal nematodes Milk production Pepsinogen pepsinogen antibody detection Argentina article blood sampling cattle energy balance feces analysis gastrointestinal infection immune deficiency intermethod comparison lactation milk production nematodiasis nonhuman parasite examination pathogen load puerperium Animals Antibodies, Helminth Argentina Cattle Cattle Diseases Dairying Feces Female Gastrointestinal Diseases Lactation Nematoda Nematode Infections Ostertagia Ostertagiasis Parasite Egg Count Parasite Load Pepsinogens Animalia Bos Nematoda Ostertagia Development of resistance to anthelmintic drugs has motivated the search for diagnostic methods to identify animals for targeted selective treatments. We compared three methods for the diagnosis of nematode infection in relation to milk production in a fully grazing dairy herd of 150 cows in the humid Pampa (Argentina). Animals had feces, blood and milk sampled during the first postpartum month for EPG, pepsinogen and anti- Ostertagia antibody determination, respectively. With the results obtained two groups of cows, divided in high and low parasite burden, were conformed for each method, and milk production was then compared between groups. When cows were separated by the EPG method (EPG = 0 (N= 106) vs. EPG > 0 (N= 44)) a difference of nearly 800. l of milk per cow per lactation was found (P< 0.05). On the other hand, milk production between groups separated by Pepsinogen (mUtyr ≤ 1000 vs. mUtyr > 1000) or by anti- Ostertagia (ODR ≤ 0.5 vs. ODR > 0.5) results did not differ. Interestingly, proportion of cows in each group differed between methods (P< 0.0001), and the anti- Ostertagia method yielded significantly more cows in the high index group compared to results using the EPG or Pepsinogen method. No correlations were found between parasite indexes determined by the different methods. High parasite burden estimation found may be ascribed to the production system, fully grazing all year round, and to the sampling time, at the beginning of lactation with cows in negative energy balance and depressed immunity. The fact that the cows were born and reared outside, on pasture with continuous nematode larvae exposure, may also account for the results obtained. In conclusion, EPG counting during the first postpartum month may be a useful tool for the diagnosis of production impairment induced by high nematode burden in adult grazing dairy cows. The anthelmintic treatment of only the EPG-positive recently calved cows would improve milk production, while reducing selective pressure on nematode population for the development of resistance. © 2011 Elsevier B.V. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03044017_v183_n1-2_p174_Mejia http://hdl.handle.net/20.500.12110/paper_03044017_v183_n1-2_p174_Mejia |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Anti-Ostertagia antibody Dairy cattle EPG Gastrointestinal nematodes Milk production Pepsinogen pepsinogen antibody detection Argentina article blood sampling cattle energy balance feces analysis gastrointestinal infection immune deficiency intermethod comparison lactation milk production nematodiasis nonhuman parasite examination pathogen load puerperium Animals Antibodies, Helminth Argentina Cattle Cattle Diseases Dairying Feces Female Gastrointestinal Diseases Lactation Nematoda Nematode Infections Ostertagia Ostertagiasis Parasite Egg Count Parasite Load Pepsinogens Animalia Bos Nematoda Ostertagia |
| spellingShingle |
Anti-Ostertagia antibody Dairy cattle EPG Gastrointestinal nematodes Milk production Pepsinogen pepsinogen antibody detection Argentina article blood sampling cattle energy balance feces analysis gastrointestinal infection immune deficiency intermethod comparison lactation milk production nematodiasis nonhuman parasite examination pathogen load puerperium Animals Antibodies, Helminth Argentina Cattle Cattle Diseases Dairying Feces Female Gastrointestinal Diseases Lactation Nematoda Nematode Infections Ostertagia Ostertagiasis Parasite Egg Count Parasite Load Pepsinogens Animalia Bos Nematoda Ostertagia Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production |
| topic_facet |
Anti-Ostertagia antibody Dairy cattle EPG Gastrointestinal nematodes Milk production Pepsinogen pepsinogen antibody detection Argentina article blood sampling cattle energy balance feces analysis gastrointestinal infection immune deficiency intermethod comparison lactation milk production nematodiasis nonhuman parasite examination pathogen load puerperium Animals Antibodies, Helminth Argentina Cattle Cattle Diseases Dairying Feces Female Gastrointestinal Diseases Lactation Nematoda Nematode Infections Ostertagia Ostertagiasis Parasite Egg Count Parasite Load Pepsinogens Animalia Bos Nematoda Ostertagia |
| description |
Development of resistance to anthelmintic drugs has motivated the search for diagnostic methods to identify animals for targeted selective treatments. We compared three methods for the diagnosis of nematode infection in relation to milk production in a fully grazing dairy herd of 150 cows in the humid Pampa (Argentina). Animals had feces, blood and milk sampled during the first postpartum month for EPG, pepsinogen and anti- Ostertagia antibody determination, respectively. With the results obtained two groups of cows, divided in high and low parasite burden, were conformed for each method, and milk production was then compared between groups. When cows were separated by the EPG method (EPG = 0 (N= 106) vs. EPG > 0 (N= 44)) a difference of nearly 800. l of milk per cow per lactation was found (P< 0.05). On the other hand, milk production between groups separated by Pepsinogen (mUtyr ≤ 1000 vs. mUtyr > 1000) or by anti- Ostertagia (ODR ≤ 0.5 vs. ODR > 0.5) results did not differ. Interestingly, proportion of cows in each group differed between methods (P< 0.0001), and the anti- Ostertagia method yielded significantly more cows in the high index group compared to results using the EPG or Pepsinogen method. No correlations were found between parasite indexes determined by the different methods. High parasite burden estimation found may be ascribed to the production system, fully grazing all year round, and to the sampling time, at the beginning of lactation with cows in negative energy balance and depressed immunity. The fact that the cows were born and reared outside, on pasture with continuous nematode larvae exposure, may also account for the results obtained. In conclusion, EPG counting during the first postpartum month may be a useful tool for the diagnosis of production impairment induced by high nematode burden in adult grazing dairy cows. The anthelmintic treatment of only the EPG-positive recently calved cows would improve milk production, while reducing selective pressure on nematode population for the development of resistance. © 2011 Elsevier B.V. |
| title |
Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production |
| title_short |
Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production |
| title_full |
Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production |
| title_fullStr |
Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production |
| title_full_unstemmed |
Comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production |
| title_sort |
comparison of three methods for gastrointestinal nematode diagnosis determination in grazing dairy cattle in relation to milk production |
| publishDate |
2011 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03044017_v183_n1-2_p174_Mejia http://hdl.handle.net/20.500.12110/paper_03044017_v183_n1-2_p174_Mejia |
| _version_ |
1768546209030471680 |