Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet
Forty-eight heifers of two genotypes, Boran (Bos indicus) and Holstein×Boran, were allocated to three feeding levels equivalent to 1.0, 1.2 and 1.4 times calculated metabolisable energy requirements for maintenance (MEm). The experiment started at the onset of reproductive activity, when the Boran a...
| Autores principales: | , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
2004
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/29178 |
| _version_ | 1855534724391370752 |
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| author | Jenet, A. Fernández Rivera, S. Tegegne, Azage Yimegnuhal, A. Osuji, P.O. Kreuzer, M. |
| author_browse | Fernández Rivera, S. Jenet, A. Kreuzer, M. Osuji, P.O. Tegegne, Azage Yimegnuhal, A. |
| author_facet | Jenet, A. Fernández Rivera, S. Tegegne, Azage Yimegnuhal, A. Osuji, P.O. Kreuzer, M. |
| author_sort | Jenet, A. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Forty-eight heifers of two genotypes, Boran (Bos indicus) and Holstein×Boran, were allocated to three feeding levels equivalent to 1.0, 1.2 and 1.4 times calculated metabolisable energy requirements for maintenance (MEm). The experiment started at the onset of reproductive activity, when the Boran and crossbred heifers were 4.4 and 2.2 years old, respectively. The response to feeding level was investigated in three physiological states: (i) puberty and growth (87 days), (ii) work and growth (94 days, 51 days thereof with work), and (iii) pregnancy and recovery from work (115 days). Neither genotype nor feeding level had effects on nutrient digestibility, digesta passage rate and reproductive performance. Daily gains and feed conversion efficiency were higher in well-fed heifers (P<0.001 and P<0.01). Estimated MEm was 0.54 MJ/kg metabolic weight (W0.75) in both genotypes during puberty and growth. Imposing work required additional 0.20 and 0.10 MJ ME/kg W0.75 in Boran and crossbreds, respectively. Recovery from work, associated with early pregnancy, apparently reduced MEm to 0.30 MJ/kg W0.75. This could be explained as a result of compensatory growth. The efficiency of utilisation of metabolisable energy for growth (0.28) did not differ (P>0.1) between genotypes and physiological states. |
| format | Journal Article |
| id | CGSpace29178 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2004 |
| publishDateRange | 2004 |
| publishDateSort | 2004 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace291782024-05-01T08:18:50Z Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet Jenet, A. Fernández Rivera, S. Tegegne, Azage Yimegnuhal, A. Osuji, P.O. Kreuzer, M. cattle energy consumption nutrient intake draught animals compensatory growth reproduction zebu [bovinae] feed conversion efficiency maintenance Forty-eight heifers of two genotypes, Boran (Bos indicus) and Holstein×Boran, were allocated to three feeding levels equivalent to 1.0, 1.2 and 1.4 times calculated metabolisable energy requirements for maintenance (MEm). The experiment started at the onset of reproductive activity, when the Boran and crossbred heifers were 4.4 and 2.2 years old, respectively. The response to feeding level was investigated in three physiological states: (i) puberty and growth (87 days), (ii) work and growth (94 days, 51 days thereof with work), and (iii) pregnancy and recovery from work (115 days). Neither genotype nor feeding level had effects on nutrient digestibility, digesta passage rate and reproductive performance. Daily gains and feed conversion efficiency were higher in well-fed heifers (P<0.001 and P<0.01). Estimated MEm was 0.54 MJ/kg metabolic weight (W0.75) in both genotypes during puberty and growth. Imposing work required additional 0.20 and 0.10 MJ ME/kg W0.75 in Boran and crossbreds, respectively. Recovery from work, associated with early pregnancy, apparently reduced MEm to 0.30 MJ/kg W0.75. This could be explained as a result of compensatory growth. The efficiency of utilisation of metabolisable energy for growth (0.28) did not differ (P>0.1) between genotypes and physiological states. 2004-09 2013-06-11T09:22:41Z 2013-06-11T09:22:41Z Journal Article https://hdl.handle.net/10568/29178 en Limited Access Elsevier Livestock Production Science;89(2-3): 159-173 |
| spellingShingle | cattle energy consumption nutrient intake draught animals compensatory growth reproduction zebu [bovinae] feed conversion efficiency maintenance Jenet, A. Fernández Rivera, S. Tegegne, Azage Yimegnuhal, A. Osuji, P.O. Kreuzer, M. Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet |
| title | Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet |
| title_full | Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet |
| title_fullStr | Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet |
| title_full_unstemmed | Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet |
| title_short | Growth and feed conversion of Boran (Bos indicus) and Holstein X Boran heifers during three physiological states receiving different levels of a tropical diet |
| title_sort | growth and feed conversion of boran bos indicus and holstein x boran heifers during three physiological states receiving different levels of a tropical diet |
| topic | cattle energy consumption nutrient intake draught animals compensatory growth reproduction zebu [bovinae] feed conversion efficiency maintenance |
| url | https://hdl.handle.net/10568/29178 |
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