| A model to optimise the requirements of lactating dairy cows for physically effective neutral detergent fibre. | |
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MedLine Citation:
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PMID: 20722298 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study modelled multiple physiological responses of dairy cows to physical and chemical characteristics of a diet aiming to optimise their requirements for physically effective neutral detergent fibre, expressed inclusive of particles-dry matter > 8 mm (peNDF > 8). Extensive research data, comprising a wide range of feeding conditions (n = 64 studies and 257 different dietary treatments), were used to parameterise the model, while statistical modelling was used to account for the inter- and intra-experiment variation as well as to derive the model estimates. Physiological thresholds and 'safety limits' of peNDF > 8 for maintaining different physiological variables were derived using non-linear statistical modelling. Results showed that peNDF > 8 content in the diet is a key factor stimulating rumination activity, maintaining optimal ruminal pH and promoting fibre digestion. Modelling data with regard to the association of fibre digestion and time duration of ruminal pH < 5.8 and dietary peNDF > 8 suggests that feeding of less than 13.7% peNDF > 8 (the lower 'safety limit') is critical to prevent depression of fibre digestion in dairy cows. The study also indicated that the beneficial effects of peNDF > 8 on ruminal pH and fibre digestion can be at the expense of the dry matter intake (DMI) level of high-producing cows when the peNDF > 8 threshold of 14.9% in the diet is exceeded. In terms of the optimisation of peNDF > 8 requirements, the modelling data suggest that feeding of 17-18.5% peNDF > 8 can be beneficial in maintaining ruminal pH, while allowing a relatively high DMI (22.3-22.7 kg x d(-1)) for average high-producing dairy cows. |
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Authors:
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Qendrim Zebeli; Dominik Mansmann; Burim N Ametaj; Herbert Steingass; Winfried Drochner |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Archives of animal nutrition Volume: 64 ISSN: 1745-039X ISO Abbreviation: Arch Anim Nutr Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-20 Completed Date: 2010-09-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101222433 Medline TA: Arch Anim Nutr Country: England |
Other Details:
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Languages: eng Pagination: 265-78 Citation Subset: IM |
Affiliation:
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Institute of Animal Nutrition, University of Hohenheim, Stuttgart, Germany. zebeli@ualberta.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed
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analysis* Animal Husbandry Animal Nutritional Physiological Phenomena Animals Cattle / physiology* Dairying Databases, Factual Dietary Fiber / analysis* Digestion / physiology Female Hydrogen-Ion Concentration Lactation / physiology* Mastication Models, Biological* Models, Statistical Nutritional Requirements Rumen / chemistry, physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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