Effect of processed cereal grains as a supplement on grass intake, rumen pool sizes, ruminal kinetics and the performance of grazing lactating dairy cows
R. Tóthi 1,   R. H. Zhang 2,   P. Chilibroste 3,   H. Boer 4,   S. Tamminga 4
More details
Hide details
University of Kaposvár, Faculty of Animal Science, Department of Animal Nutrition, P.O. Box 16, H-7401 Kaposvár, Hungary
Inner Mongolia Agricultural University, 306 zhao wu da Rd. Huhhot, P.R. China
Facultad de Agronomia, EEMAC, Ruta 3 km 363, Paysandu, CP 60000, Uruguay
Wageningen Institute of Animal Science, Animal Nutrition Group, Marijkeweg 40, NL-6709 PG Wageningen, The Netherlands
Publication date: 2003-07-15
J. Anim. Feed Sci. 2003;12(3):417–433
Five multiparous lactating Holstein-Friesian dairy cows fitted with rumen cannula were allowed to graze perennial ryegrass swards. Next to a control treatment of grazing only, pelleted barley (PB), pelleted maize (PM), toasted and subsequently pelleted barley (TPB), and toasted and subsequently pelleted maize (TPM) were fed as a supplement in two equal portions. Before and after 3 h of grazing the rumen content was evacuated, weighed, sampled and returned to the animals. Then the cows were kept inside the barn and starved for 6 h, after which rumen evacuations were repeated. The estimated clearance rates of starch showed significant differences (P<0.001) between grain types and compared to unsupplemented animals the apparent ruminal clearance of nitrogen was significantly (P<0.001) reduced. Supplementation with processed grains significantly increased (P<0.05) the milk production and significantly (P<0.001) decreased milk fat percentage. It is concluded that supplementing grass with high-energy low protein feeds, such as grains, substantially improves the N utilization and reduces the urea output in milk.
Short-term feed intake regulation of dairy cows fed a total mixed ration or grazing forage oats
J. Soutto, M. Carriquiry, P. Chilibroste, A. Astessiano, M. Garcia-Roche, A. Trujillo
Animal Production Science