Effect of maize grain and herbage allowance on estimated metabolizable energy intake and animal performance in beef cattle finishing systems
| Autor: | Claudio Machado, S. T. Morris, John G. Hodgson, Horacio Berger, N. J. Auza |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Grass and Forage Science. 61:385-397 |
| ISSN: | 1365-2494 0142-5242 |
| Popis: | This study investigated the effects of levels of supplementation with maize grain and herbage allowance (HA) on grass herbage and maize intake, animal performance and grazing behaviour in two replicated grazing experiments with Angus beef cattle in Argentina. In Experiment 1, the response to increasing HA (2·5, 5·0 and 7·5 kg DM herbage 100 kg−1 live weight (LW) d−1 with and without 0·5 kg DM maize grain 100 kg−1 LW d−1) was investigated. In Experiment 2, the responses to level of maize grain offered (0, 0·5 and 1·0 kg DM maize grain 100 kg−1 LW d−1) at an HA of 2·5 kg DM herbage 100 kg−1 LW d−1 and an HA of 5·0 kg 100 kg−1 LW d−1 without maize grain were assessed. In Experiment 2, soyabean meal was added to control the crude protein concentration in the diet. Two methods were used for intake estimations: pre- and post-feeding herbage mass difference, and the use of the n-alkane and 13C technique. The latter predicted most accurately the metabolizable energy requirements calculated from live weights and liveweight gain of beef cattle attained in each treatment in both experiments. Increasing HA significantly increased herbage intake and liveweight gain (P |
| Databáze: | OpenAIRE |
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