Feed intake and nutrient digestibility of dairy cows during and after excess of energy supply 1. communication on the influence of excessive energy supply and its consequences

Kaufmann, T.E.G.; Kirchgessner, M.

Journal of Animal Physiology and Animal Nutrition 57(5): 237-251

1987


ISSN/ISBN: 0931-2439
Accession: 005452800

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Abstract
The direct influences of excess energy (20 MJ NEL beyond requirement over four weeks, replicated two times) and its results in following periods with normal energy supply on the digestibilities of nutrients were studied in a metabolism trial with four pairs of monozygotic twins in their second lactation. The effects were measured in comparison with a control group, consisting of the standard fed twin pairs of the overfed ones. The surplus of energy was reached with higher intake of concentrates, which resulted in a higher dry matter intake by 1,5 kg. The rations differed in contents of crude protein, crude fiber and lipids, but intake of nutrients was only higher in lipids. Digestibilities of DM, OM, NfE and energy decreased by 2-3, of crude protein and crude fiber by 5 and 9 percent points, respectively. Digestibility of lipids raised by 6,5 percent points. True digestibility of crude protein was not affected by energy supply and reached 96%. However, consequences of the previous energy supplementation on digestibilities after four weeks of standard feeding could not be detected.