Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract
A total of 505 lactation records from 340 cows of the N'Dama breed were matched with health records recorded on the same animals over a period of 4 years. The objective of the analysis was to establish linkages between 3 criteria of trypanotolerance namely, frequency of infection, control of parasit...
| Main Author: | |
|---|---|
| Format: | Conference Paper |
| Language: | Inglés |
| Published: |
Cornell University
1995
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/50790 |
| _version_ | 1855535854794047488 |
|---|---|
| author | Agyemang, K. |
| author_browse | Agyemang, K. |
| author_facet | Agyemang, K. |
| author_sort | Agyemang, K. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | A total of 505 lactation records from 340 cows of the N'Dama breed were matched with health records recorded on the same animals over a period of 4 years. The objective of the analysis was to establish linkages between 3 criteria of trypanotolerance namely, frequency of infection, control of parasitemia and control of anemia associated with the disease, on one hand, and performance traits: milk offtake, calf weaning weight, calving interval, and a cow productivity index incorporating these traits, on the other hand. The longer term objective is to include one or more of these criteria in a selection index for genetic improvement programs, if found to be associated with performance traits. Least-squares analyses showed that the control of anemia measured by packed red cell volume (PCV) was more frequently linked with performance traits than the other criteria. Infected cows which maintained above-average PCV values had a 84 percent higher (P<0.05) cow productivity index than those with below-average PCV. Uninfected cows achieved a 60 percent higher (P<0.05) cow productivity index than infected cows (64.0 (+ or-) - 5.44 vs. 39.8 (+ or -) - 7.15 kg calf weight/cow/year). It was concluded that the effects observed were large enough to suggest that selection of animals based on some of the criteria will give correlated response in performance traits, provided the criteria have genetic basis. |
| format | Conference Paper |
| id | CGSpace50790 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1995 |
| publishDateRange | 1995 |
| publishDateSort | 1995 |
| publisher | Cornell University |
| publisherStr | Cornell University |
| record_format | dspace |
| spelling | CGSpace507902023-02-15T09:41:04Z Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract Agyemang, K. n'dama cattle trypanosomiasis animal performance disease resistance A total of 505 lactation records from 340 cows of the N'Dama breed were matched with health records recorded on the same animals over a period of 4 years. The objective of the analysis was to establish linkages between 3 criteria of trypanotolerance namely, frequency of infection, control of parasitemia and control of anemia associated with the disease, on one hand, and performance traits: milk offtake, calf weaning weight, calving interval, and a cow productivity index incorporating these traits, on the other hand. The longer term objective is to include one or more of these criteria in a selection index for genetic improvement programs, if found to be associated with performance traits. Least-squares analyses showed that the control of anemia measured by packed red cell volume (PCV) was more frequently linked with performance traits than the other criteria. Infected cows which maintained above-average PCV values had a 84 percent higher (P<0.05) cow productivity index than those with below-average PCV. Uninfected cows achieved a 60 percent higher (P<0.05) cow productivity index than infected cows (64.0 (+ or-) - 5.44 vs. 39.8 (+ or -) - 7.15 kg calf weight/cow/year). It was concluded that the effects observed were large enough to suggest that selection of animals based on some of the criteria will give correlated response in performance traits, provided the criteria have genetic basis. 1995 2014-10-31T06:21:40Z 2014-10-31T06:21:40Z Conference Paper https://hdl.handle.net/10568/50790 en Limited Access Cornell University |
| spellingShingle | n'dama cattle trypanosomiasis animal performance disease resistance Agyemang, K. Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract |
| title | Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract |
| title_full | Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract |
| title_fullStr | Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract |
| title_full_unstemmed | Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract |
| title_short | Linkages between criteria of trypanotolerance and livestock performance traits in N'Dama cattle in the Gambia. Abstract |
| title_sort | linkages between criteria of trypanotolerance and livestock performance traits in n dama cattle in the gambia abstract |
| topic | n'dama cattle trypanosomiasis animal performance disease resistance |
| url | https://hdl.handle.net/10568/50790 |
| work_keys_str_mv | AT agyemangk linkagesbetweencriteriaoftrypanotoleranceandlivestockperformancetraitsinndamacattleinthegambiaabstract |