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In sacco degradation of organic matter and crude protein of fresh grass (Lolium perenne) in the rumen of grazing dairy cows

Published online by Cambridge University Press:  27 March 2009

A. M. van Vuuren ,
S. Tamminga  and
R. S. Ketelaar
A. M. van Vuuren
Affiliation:
Research Institute for Livestock Feeding and Nutrition, PO Box 160, 8200 AD Lelystad, Netherlands
S. Tamminga
Affiliation:
Research Institute for Livestock Feeding and Nutrition, PO Box 160, 8200 AD Lelystad, Netherlands
R. S. Ketelaar
Affiliation:
Research Institute for Livestock Feeding and Nutrition, PO Box 160, 8200 AD Lelystad, Netherlands
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Summary

In three experiments, carried out in 1985 and 1986 in the Netherlands, the effects of herbage maturation and rate of nitrogen fertilization on rumen degradability of organic matter (OM) and crude protein (CP) in fresh herbage (Lolium perenne) were studied using the nylon bag technique. Experimental farms at Lelystad and Swifterbant (clay soil) and Achterberg (sandy soil) provided the herbage samples. From the results, the content of digestible CP entering the small intestine (DPI) was estimated.

Crude protein content and in sacco degradability of OM and CP decreased with increasing grass maturity and with decreasing rate of N application. With every 100 g/kg DM decrease in CP content, the estimated content of DPI decreased by 19 g/kg DM, no matter how the CP content was manipulated.

Type
Animals
Information
The Journal of Agricultural Science , Volume 116 , Issue 3 , June 1991 , pp. 429 - 436
Copyright
Copyright © Cambridge University Press 1991

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