Effects of diet forage proportion on maintenance energy requirement and the efficiency of metabolizable energy use for lactation by lactating dairy cows

文献类型： 外文期刊

第一作者： Dong, L. F.

作者： Dong, L. F.;Ferris, C. P.;Yan, T.;Dong, L. F.;McDowell, D. A.;Dong, L. F.

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关键词： forage proportion;maintenance energy requirement;energy utilization efficiency;lactating dairy cow

期刊名称：JOURNAL OF DAIRY SCIENCE （ 影响因子：4.034； 五年影响因子：4.354 ）

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收录情况： SCI

摘要： The objective of the present study was to examine the effect of dietary forage proportion (FP) on metabolizable energy (ME) requirement for maintenance (MEm) and the efficiency of ME use for lactation (k(1)) in lactating dairy cows. Data used were derived from 32 calorimetric chamber experiments undertaken at our institute between 1.992 and 2010, including data from 818 Holstein-Friesian cows (HF), 50 Norwegian Red cows, and 62 crossbred cows (Jersey x HF or Norwegian Red x HF). Animals were offered forage-only rations (n = 66) or forage and concentrate rations (n = 864) with FP ranging from 18 to 100% (dry matter basis). The effect of FP was evaluated by dividing the whole data set into 4 groups according to the FP ranges, categorized as FP <30%, FP = 30 to 59%, FP = 60 to 99%, and FP = 100%. The MEm for individual cows was calculated from heat production minus energy losses from inefficiencies of ME use for lactation, energy retention and pregnancy, and k(1) was obtained from milk energy output adjusted to zero energy balance (E-1(0)) divided by ME available for production. Increasing FP significantly reduced ME intake and milk energy output, although the differences between the 2 low FP groups were not significant. However, increasing FP significantly increased the ratio of heat production over ME intake and MEm (MJ/kg(0.75)), with the exception that the increases did not reach significance in heat production/ME intake between FP <30% and FP = 30 to 59%, or in MEm between FP = 60 to 99% and FP = 100%. However, the FP had no significant effect on the k(1) values, which were similar among the 4 groups of cows. The effect of FP was also evaluated using the linear mixed regression technique relating E-1(0) to ME intake. The results demonstrated that with a common regression coefficient (slope), the regression constants (intercepts) taken as net energy requirement for maintenance significantly increased with increasing FP. However, the increase between the 2 high FP groups did not research significance. It is concluded that increasing diet FP had no effects on k(1) but significantly increased maintenance energy requirement (MJ/kg(0.75)). These results indicate that using the current energy feeding systems to ration dairy cows managed under low input systems, may underestimate their nutrient requirements, because the majority of feeding systems adopted globally do not differentiate the maintenance energy requirements between low and high forage input systems.

分类号： TS252

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