Abstract
1. Effect of fat supplementation on nitrogen utilisation of lambs and nitrogen emission from their manure A. Machmüller, D.A. Ossowski, M. Kreuzer Livestock Science CrossRef
Highlights
Subsequent to the ban of either all or most antibiotics from feeding of livestock in many European countries, search for efficient feed additives has shifted towards na-PLANT EXTRACTS IN DAIRY COW DIETS tural compounds, secondary plant constituents
This may open an important field of application for plant extracts containing secondary plant constituents, either to prevent a protein deficiency improving performance or to reduce losses of non-utilized N from the animal and from manure in the form of environmentally hazardous ammonia emissions (Kröber et al, 2000)
The effects of supplementing the plant extract rich in essential oils remained without significant effect on DM intake, water intake (85 ± 26 vs 81 ± 19 kg/d, on average in control and supplemented group; data not shown in Table), liveweight, milk yield and milk composition
Summary
Subsequent to the ban of either all or most antibiotics from feeding of livestock in many European countries, search for efficient feed additives has shifted towards na-PLANT EXTRACTS IN DAIRY COW DIETS tural compounds, secondary plant constituents. Dairy cow diets are often limited in metabolically available protein rather than in net energy This may open an important field of application for plant extracts containing secondary plant constituents, either to prevent a protein deficiency improving performance or to reduce losses of non-utilized N from the animal and from manure in the form of environmentally hazardous ammonia emissions (Kröber et al, 2000). The latter effects are expected from saponins and tannins, as saponins massively reduce ruminal ammonia formation (discussed in detail by Śliwiński et al, 2002b) and tannins are known to form complexes with protein (Brooker et al, 2002). This means that secondary plant constituents may be interesting in improving N utilization and reducing environmental pollution in dairy husbandry as major elements of current animal nutrition strategies (Castillo et al, 2000)
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