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| Nielsen, B.K.; Kristensen, A.R.; Thamsborg, S.M.. |
| Organic steer production demand several decisions concerning grazing strategy, feeding level in the winter and factors as slaughter weight and length of the fattening period. The production system can be difficult to optimise, therefore the objective of this study was to develop a model to optimise the grazing strategy, feed level in winter and time of fattening and slaughter in organic steer production with regard to economic output at steer level. The steer model is a 4-level hierarchical Markov process with decisions defined at three levels. Decisions taken in the model include grazing strategy (permanent or ryegrass/clover pasture), feed level in winter (high and low), time for beginning of fattening (age 19-27 months) and time of slaughter (age 19-30... |
| Tipo: Journal paper |
Palavras-chave: Production systems. |
| Ano: 2004 |
URL: http://orgprints.org/1871/1/optimal_decisions.doc |
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| Nielsen, B.K.; Thamsborg, S.M.; Kristensen, T.. |
| On two organic farms, the effect of supplementation with either home-grown barley or organic commercial concentrates primarily based on local protein sources and barley, on weight gain and subclinical coccidiosis was investigated in 3-5 months old dairy breed calves in the period after turn-out to ryegrass/clover pastures. The calves (mean liveweight ± SD, 124 ± 24 kg and 133 ± 24 kg on Farm I and II respectively) were supplemented daily with 3 kg energy and protein-rich commercial concentrates (group EP), 3 kg barley (group E) or ½ kg barley (group Eres) for 8 weeks following turn-out on pasture. Daily weight gains in the 8 weeks were for Farm I: 1216 and 1042 g/day for group EP and E (P < 0.01) and for Farm II: 1071, 671 and 770 g/day for group EP,... |
| Tipo: Journal paper |
Palavras-chave: Feeding and growth. |
| Ano: 2003 |
URL: http://orgprints.org/1396/1/Article.pdf |
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