| Changes in feed intake,nutrient digestion,plasma metabolites,and oxidative stress parameters in dairy cows with subacute ruminal acidosis and its regulation with pelleted beet pulp |
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| 作者姓名： | Yongqing Guo Xiaofeng Xu Yang Zou Zhanshan Yang Shengli Li Zhijun Cao |
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| 基金项目： | financially supported by funds from the National Key Basic Research Program of China(Project No.2011CB100801) |
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| 摘 要： | The objectives of this study were to 1) determine the variation of nutrient digestion, plasma metabolites and oxidative stress parameters triggered by induced subacute ruminal acidosis(SARA); and 2) evaluate the ability of pelleted beet pulp(BP) as a replacement for ground corn to alleviate SARA. Eight Holstein-Friesian cows were fed four diets during four successive17-day periods: 1) total mixed ration(TMR) containing 0% finely ground wheat(FGW)(W0); 2) TMR containing 10% FGW(W10); 3) TMR containing 20% FGW(W20); and 4) TMR containing 10% BP as a replacement for 10% ground corn(BP10). The SARA induction protocol reduced the mean ruminal pH from6.37 to 5.94, and the minimum ruminal pH decreased from 5.99 to 5.41 from baseline to challenge period. Mean ruminal pH increased from 5.94 to 6.05, and minimum daily ruminal pH increased from 5.41 to 5.63, when BP was substituted for corn. The apparent digestibility of nutrients was not affected by the dietary treatments, except that the digestibility of neutral detergent fibre(NDF) and acid detergent fibre(ADF) was reduced in cows fed the W20diet compared with cows fed the W0 and W10 diets, and cows fed the BP10 diet had higher NDF and ADF digestibility than the cows fed the W20 diet. Cows fed the W20 diet had a lower plasma concentration ofβ-hydroxybutyrate(BHBA), non-esterified fatty acids(NEFA), cholesterol, triglyceride, and total antioxidative capacity(TAC), and a higher plasma concentration of glucose, insulin, malonaldehyde(MDA), super oxygen dehydrogenises(SOD), and glutathione peroxidase(GSH-Px) than cows fed the W0 diet. Substitution of BP for corn increased concentrations of plasma BHBA and TAC, but decreased concentrations of plasma MDA. Our results indicate that reduction of fibre digestion; the concomitant increase of plasma glucose and insulin; the decrease of plasma BHBA, NEFA, cholesterol, and triglyceride; and changes of plasma oxidative stress parameters are highly related to SARA induced by W20 diets. These variables may be alternative candidates for SARA diagnosis. We also suggest that the substitution of BP for corn could reduce the risk of SARA, increase fibre digestion, and improve the antioxidant status in dairy cows.
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| 关 键 词： | 表观消化率 瘤胃酸中毒 血浆浓度 奶牛饲喂 营养物质 氧化应激 代谢物 亚急性 |
Changes in feed intake,nutrient digestion,plasma metabolites,and oxidative stress parameters in dairy cows with subacute ruminal acidosis and its regulation with pelleted beet pulp |
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| Yongqing Guo,Xiaofeng Xu,Yang Zou,Zhanshan Yang,Shengli Li,Zhijun Cao.Changes in feed intake,nutrient digestion,plasma metabolites,and oxidative stress parameters in dairy cows with subacute ruminal acidosis and its regulation with pelleted beet pulp[J].Journal of Animal Science and Biotechnology,2014(1):64-73. |
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| Authors: | Yongqing Guo Xiaofeng Xu Yang Zou Zhanshan Yang Shengli Li Zhijun Cao |
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| Institution: | State Key Laboratory of Animal Nutrition, College of Animal Science ＆amp; Technology, China Agricultural University, Beijing 100193, China |
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| Abstract: | Beet pulp, Dairy cow, Nutrient digestion, Oxidative status, Plasma metabolites, Subacute ruminal acidosis |
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| Keywords: | Beet pulp Dairy cow Nutrient digestion Oxidative status Plasma metabolites Subacute ruminal acidosis |
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