Environmental and genetic factors affecting milk production of Butana cattle in the Sudan
Factors affecting milk production in the Butana are investigated. Production records of 353 Butana cows with 1,311 calvings during the years 1943-57 from a governmental dairy farm herd on the north of Atbara, Sudan were analysed. Heifers averaged 44 months old at first calving. The average interval...
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
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American Dairy Science Association
1962
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| Acceso en línea: | https://hdl.handle.net/10568/66797 |
| _version_ | 1855535013365284864 |
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| author | Alim, K.A. |
| author_browse | Alim, K.A. |
| author_facet | Alim, K.A. |
| author_sort | Alim, K.A. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Factors affecting milk production in the Butana are investigated. Production records of 353 Butana cows with 1,311 calvings during the years 1943-57 from a governmental dairy farm herd on the north of Atbara, Sudan were analysed. Heifers averaged 44 months old at first calving. The average interval between consecutive calving was 416 days. The average milk yield in 253 days was 3,129 lb, with a standard deviation of 1,709 lb. There were highly significant differences between all production traits at different years. No real differences were evident in milk yield records due to month of calving or age of cows in lactation. Repeatability estimates of single record milk yield, calving intervals, lactation periods, and dry periods were: 0.415± 0.037, 0.111±0.039, 0.415 ± 0.043, and 0.221±0.037, respectively. Heritability of a single record milk yield was estimated as 0.278± 0.232 and two records as 0.302±0.286. The total generation length was 25.87 years, and it was estimated that the annual genetic improvement in milk yield amounted to about 0.7% of the herd average. Most of the improvement had been brought about by the selection of the sires used. |
| format | Journal Article |
| id | CGSpace66797 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1962 |
| publishDateRange | 1962 |
| publishDateSort | 1962 |
| publisher | American Dairy Science Association |
| publisherStr | American Dairy Science Association |
| record_format | dspace |
| spelling | CGSpace667972024-11-15T08:52:55Z Environmental and genetic factors affecting milk production of Butana cattle in the Sudan Alim, K.A. cattle genetics environment milk production Factors affecting milk production in the Butana are investigated. Production records of 353 Butana cows with 1,311 calvings during the years 1943-57 from a governmental dairy farm herd on the north of Atbara, Sudan were analysed. Heifers averaged 44 months old at first calving. The average interval between consecutive calving was 416 days. The average milk yield in 253 days was 3,129 lb, with a standard deviation of 1,709 lb. There were highly significant differences between all production traits at different years. No real differences were evident in milk yield records due to month of calving or age of cows in lactation. Repeatability estimates of single record milk yield, calving intervals, lactation periods, and dry periods were: 0.415± 0.037, 0.111±0.039, 0.415 ± 0.043, and 0.221±0.037, respectively. Heritability of a single record milk yield was estimated as 0.278± 0.232 and two records as 0.302±0.286. The total generation length was 25.87 years, and it was estimated that the annual genetic improvement in milk yield amounted to about 0.7% of the herd average. Most of the improvement had been brought about by the selection of the sires used. 1962-02 2015-06-05T12:17:43Z 2015-06-05T12:17:43Z Journal Article https://hdl.handle.net/10568/66797 en Limited Access American Dairy Science Association Alim, K.A. 1962. Environmental and genetic factors affecting milk production of Butana cattle in the Sudan. Journal of Dairy Science 45(2): 242-247. |
| spellingShingle | cattle genetics environment milk production Alim, K.A. Environmental and genetic factors affecting milk production of Butana cattle in the Sudan |
| title | Environmental and genetic factors affecting milk production of Butana cattle in the Sudan |
| title_full | Environmental and genetic factors affecting milk production of Butana cattle in the Sudan |
| title_fullStr | Environmental and genetic factors affecting milk production of Butana cattle in the Sudan |
| title_full_unstemmed | Environmental and genetic factors affecting milk production of Butana cattle in the Sudan |
| title_short | Environmental and genetic factors affecting milk production of Butana cattle in the Sudan |
| title_sort | environmental and genetic factors affecting milk production of butana cattle in the sudan |
| topic | cattle genetics environment milk production |
| url | https://hdl.handle.net/10568/66797 |
| work_keys_str_mv | AT alimka environmentalandgeneticfactorsaffectingmilkproductionofbutanacattleinthesudan |