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Journal of Dairy Science
Shabi, Z., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Arieli, A., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Bruckental, I., Institute of Animal Science, Agriculture Research Organization, Volcani Center, Bet Dagan 50250, Israel
Aharoni, Y., Institute of Animal Science, Agriculture Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zamwel, S., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Bor, A., Institute of Animal Science, Agriculture Research Organization, Volcani Center, Bet Dagan 50250, Israel
Tagari, H., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Four Holstein cows in midlactation were equipped with ruminal and abomasal cannulas and used to study the effect of synchronized degradation of crude protein (CP) and organic matter (OM) and feeding frequency on digestion and outflow of nutrients. A 4 × 4 Latin square design was used. Diets were arranged in a 2 × 2 factorial design; the four diets contained high ruminally degradable OM and high ruminally degradable CP, high ruminally degradable OM and low ruminally degradable CP, low ruminally degradable OM and high ruminally degradable CP, and low ruminally degradable OM and low ruminally degradable CP. In each period, cows were fed four times daily from d 1 to 14 and two times daily from d 15 to 28. Mean daily ruminal ammonia N concentration was reduced by high ruminally degradable OM, low ruminally degradable CP, and twice daily feeding. Fluctuation in ruminal ammonia N was lower when cows were fed four times daily than when cows were fed twice daily. Plasma urea N concentrations were lower for cows fed diets that were high in ruminally degradable CP. Higher CP flow in the abomasum was found for cows fed the diet containing high ruminally degradable OM and low ruminally degradable CP. Microbial dry matter and CP flow to the abomasum were higher for cows fed twice daily than for cows fed four times daily. Flow of OM in the abomasum was not altered by concentrations of ruminally degradable OM or CP. These results suggest that the available energy in the rumen (ruminally degradable OM) is the most limiting factor for ruminal N utilization under our experimental conditions. Use of these data may improve the prediction of plasma urea N.
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תנאי שימוש
Effect of the Synchronization of the Degradation of Dietary Crude Protein and Organic Matter and Feeding Frequency on Ruminal Fermentation and Flow of Digesta in the Abomasum of Dairy Cows
81
Shabi, Z., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Arieli, A., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Bruckental, I., Institute of Animal Science, Agriculture Research Organization, Volcani Center, Bet Dagan 50250, Israel
Aharoni, Y., Institute of Animal Science, Agriculture Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zamwel, S., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Bor, A., Institute of Animal Science, Agriculture Research Organization, Volcani Center, Bet Dagan 50250, Israel
Tagari, H., Hebrew University, Faculty of Agriculture, Rehovot 76100, Israel
Effect of the Synchronization of the Degradation of Dietary Crude Protein and Organic Matter and Feeding Frequency on Ruminal Fermentation and Flow of Digesta in the Abomasum of Dairy Cows
Four Holstein cows in midlactation were equipped with ruminal and abomasal cannulas and used to study the effect of synchronized degradation of crude protein (CP) and organic matter (OM) and feeding frequency on digestion and outflow of nutrients. A 4 × 4 Latin square design was used. Diets were arranged in a 2 × 2 factorial design; the four diets contained high ruminally degradable OM and high ruminally degradable CP, high ruminally degradable OM and low ruminally degradable CP, low ruminally degradable OM and high ruminally degradable CP, and low ruminally degradable OM and low ruminally degradable CP. In each period, cows were fed four times daily from d 1 to 14 and two times daily from d 15 to 28. Mean daily ruminal ammonia N concentration was reduced by high ruminally degradable OM, low ruminally degradable CP, and twice daily feeding. Fluctuation in ruminal ammonia N was lower when cows were fed four times daily than when cows were fed twice daily. Plasma urea N concentrations were lower for cows fed diets that were high in ruminally degradable CP. Higher CP flow in the abomasum was found for cows fed the diet containing high ruminally degradable OM and low ruminally degradable CP. Microbial dry matter and CP flow to the abomasum were higher for cows fed twice daily than for cows fed four times daily. Flow of OM in the abomasum was not altered by concentrations of ruminally degradable OM or CP. These results suggest that the available energy in the rumen (ruminally degradable OM) is the most limiting factor for ruminal N utilization under our experimental conditions. Use of these data may improve the prediction of plasma urea N.
Scientific Publication
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