Effect of processed cereal grains as a supplement on grass intake, rumen pool sizes, ruminal kinetics and the performance of grazing lactating dairy cows
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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
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