Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes
Approximately 320 East African Zebu cows over 36 months of age were monitored monthly from 1986 to 1992 in nine village herds in an area of high trypanosomiasis risk in southwest Ethiopia where there was resistance to all available trypanocidal drugs. Cows were individually treated with diminazene a...
| Autores principales: | , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
1995
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/27976 |
| _version_ | 1855528965690621952 |
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| author | Rowlands, G.J. Woudyalew Mulatu Nagda, S.M. D'Ieteren, G.D.M. |
| author_browse | D'Ieteren, G.D.M. Nagda, S.M. Rowlands, G.J. Woudyalew Mulatu |
| author_facet | Rowlands, G.J. Woudyalew Mulatu Nagda, S.M. D'Ieteren, G.D.M. |
| author_sort | Rowlands, G.J. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Approximately 320 East African Zebu cows over 36 months of age were monitored monthly from 1986 to 1992 in nine village herds in an area of high trypanosomiasis risk in southwest Ethiopia where there was resistance to all available trypanocidal drugs. Cows were individually treated with diminazene aceturate, either when they were detected parasitaemic and their packed red cell volume (PCV) decreased below 26 percent or when they showed clinical signs of trypanosomiasis. The average annual monthly trypanosome prevalence was 24 percent and the number of treatments of diminazene aceturate per cow per year was 3.1 both of which increased with age. Mean PCV decreased and mean trypanosome prevalence increased during lactation. There was a significant linear association between the time detected parasitaemic during lactation and calving interval. When corrected for frequency of parasitaemia and treatment there was also an average reduction of 8.4 + 2.6 days in calving interval per percent unit increase in PCAge at first calving decreased by 0.44 + 0.26 months per percent unit increase in mean PCV maintained between 24 and 30 months corrected for parasitaemia and treatment. The percentage of pregnancies terminating in abortions significantly increased from 6.8 + 1.0 percent to 10.4 + 1.3 percent when cows detected parasitaemic at least once during the last three months of pregnancy were compared with cows not detected parasitaemic at least once during the last three months of pregnancy were compared with cows not detected parasitaemic. The largest increase to 19.4 +- 4.3 percent was in cows with low mean PCVs < 22 percent. It was concluded that cows which were able to maintain higher than average PCVs when parasitaemic showed superior reproductive performance than those with lower than average PCVs. |
| format | Journal Article |
| id | CGSpace27976 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1995 |
| publishDateRange | 1995 |
| publishDateSort | 1995 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace279762024-04-25T06:01:09Z Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes Rowlands, G.J. Woudyalew Mulatu Nagda, S.M. D'Ieteren, G.D.M. trypanosomes (phytomonas) disease prevalence genetic variation zebu cattle cows pesticide resistance reproductive performance Approximately 320 East African Zebu cows over 36 months of age were monitored monthly from 1986 to 1992 in nine village herds in an area of high trypanosomiasis risk in southwest Ethiopia where there was resistance to all available trypanocidal drugs. Cows were individually treated with diminazene aceturate, either when they were detected parasitaemic and their packed red cell volume (PCV) decreased below 26 percent or when they showed clinical signs of trypanosomiasis. The average annual monthly trypanosome prevalence was 24 percent and the number of treatments of diminazene aceturate per cow per year was 3.1 both of which increased with age. Mean PCV decreased and mean trypanosome prevalence increased during lactation. There was a significant linear association between the time detected parasitaemic during lactation and calving interval. When corrected for frequency of parasitaemia and treatment there was also an average reduction of 8.4 + 2.6 days in calving interval per percent unit increase in PCAge at first calving decreased by 0.44 + 0.26 months per percent unit increase in mean PCV maintained between 24 and 30 months corrected for parasitaemia and treatment. The percentage of pregnancies terminating in abortions significantly increased from 6.8 + 1.0 percent to 10.4 + 1.3 percent when cows detected parasitaemic at least once during the last three months of pregnancy were compared with cows not detected parasitaemic at least once during the last three months of pregnancy were compared with cows not detected parasitaemic. The largest increase to 19.4 +- 4.3 percent was in cows with low mean PCVs < 22 percent. It was concluded that cows which were able to maintain higher than average PCVs when parasitaemic showed superior reproductive performance than those with lower than average PCVs. 1995-05 2013-05-06T06:59:40Z 2013-05-06T06:59:40Z Journal Article https://hdl.handle.net/10568/27976 en Limited Access Elsevier Acta Tropica;59(2): 105-116 |
| spellingShingle | trypanosomes (phytomonas) disease prevalence genetic variation zebu cattle cows pesticide resistance reproductive performance Rowlands, G.J. Woudyalew Mulatu Nagda, S.M. D'Ieteren, G.D.M. Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes |
| title | Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes |
| title_full | Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes |
| title_fullStr | Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes |
| title_full_unstemmed | Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes |
| title_short | Variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in East African Zebu cows exposed to drug-resistant trypanosomes |
| title_sort | variations in packed red cell volume and trypanosome prevalence and relationships with reproductive traits in east african zebu cows exposed to drug resistant trypanosomes |
| topic | trypanosomes (phytomonas) disease prevalence genetic variation zebu cattle cows pesticide resistance reproductive performance |
| url | https://hdl.handle.net/10568/27976 |
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