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http://dx.doi.org/10.5333/KGFS.2008.28.3.255

Effects of Rumen Protected Choline on In vitro Ruminal Fermentation and Milk Production and Its Composition in Lactating Cows  

Park, Byung-Ki (National Institute of Animal Science, RDA)
Kim, Byong-Wan (College of Animal Life Science, Kangwon National University)
Jang, Hyun-Yong (College of Animal Life Science, Kangwon National University)
Shin, Jong-Suh (College of Animal Life Science, Kangwon National University)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.28, no.3, 2008 , pp. 255-264 More about this Journal
Abstract
This study was conducted to evaluate the effects of rumen protected choline on in vitro ruminal fermentation and milk production and its composition in Holstein cows. Experiments were done with three treatment groups, basal diet without any supplement (T1), basal diet+23g/d of mixture of choline and wheat shorts (T2) and basal diet + 25.56 g/d of rumen protected choline (T3). The in vitro ruminal pH and ammonia concentrations were similar for three treatments during all incubation periods except for the in vitro ruminal pH on 3 hr incubation and ammonia concentrations on 9 hr incubation. No significant difference was found in the concentrations of acetate and total-VFA. The propionate and butyrate concentrations were not affected by the rumen protected choline except on 6 hr incubation on which the propionate and butyrate concentrations were intermediate (8.98 mg/dl) and least (3.22 mg/dl), respectively. Higher milk yield and milk fat and lactose were resulted in the rumen protected choline. However, the rumen protected choline did not affect the milk protein, solids not fat, total solids, MUN, somatic cell count. It is concluded that the rumen protected choline can be effective materials to improve the milk production, milk fat and lactose without little change on in vitro ruminal fermentation.
Keywords
Rumen protected choline; In vitro ruminal fermentation; Milk production; Holstein cows;
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