Structural and non structural carbohydrates in concentrate supplements of silage based dairy cow rations 1. feed intake and milk production

De-Visser, H.; Van-Der-Togt, P.L.; Tamminga, S.

Netherlands Journal of Agricultural Science 38(3B): 487-498


ISSN/ISBN: 0028-2928
Accession: 007824402

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A feeding trial was carried out with 64 multiparous dairy cows, in which the effects of type of carbohydrates in concentrate mixtures (starch versus cell wall constituents) and differences in rumen degradation (fast versus slow) on feed intake and milk production were studied. The experiment started immediately after parturition and lasted for 15 weeks. The basal diet which comprised 75% of the total dry matter (DM) intake, consisted of wilted grass silage, maize silage and concentrates. The remaining part of the diet consisted of barley (B), maize (M), pressed ensiled beet pulp (P) or moist ensiled maize brain (MB). All diets were fed as totally mixed ratios (TMR). Total intake of DM and net energy did not differ between diets, but differences were found in energy partition. There was a tendency for cows fed diet B to show increased body weight gain, while cows fed P mobilized more body reserves, compared to the other treatments. Milk production did not differ between diets, but milk fat content was higher for diet P. Milk protein content was higher for diets B and M, compared to P and MB. The lower protein content of the milk of treatment P can be explained by a longer period of negative energy balance, while the lower milk protein in cows fed diet MB probably resulted from a reduced microbial protein synthesis.