PREDICTION OF ENERGY VALUE OF COWS MILK
PREDICTION OF ENERGY VALUE OF COWS MILK
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DOI：
10.3168/jds.s0022-0302(65)88430-2
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发表时间：
1965-01-01
影响因子：
3.5
通讯作者：
REID, JT
中科院分区：
文献类型：
--
作者：
TYRRELL, HF;REID, JT
泌乳反应的量化要求将不同化学成分的不同产奶量等同于一个共同的术语。虽然总能量值是所有有机物质都可以还原的最常见的特征，但其直接测量是昂贵的。因此，在600个2天和7天的复合样品的牛奶从42个荷斯坦奶牛和范围从1.6%到6.4%的脂肪的能量值和浓度的总固体，固体非脂肪（SNF），脂肪，蛋白质，乳糖和灰分之间的关系进行了研究。对21种不同的牛奶成分组合的分析表明，准确预测（C. V.= 1.3%）具有广泛化学成分的牛奶能量值的最实用方程为：能量（千卡/磅）= 41.84（%脂肪）+ 22.29（% SNF）- 25.58。由此，推导出以下公式以计算含有340千卡能量/磅的固体校正乳（SCM）产量：SCM（lb）= 12.3（F）+ 6.56（SNF）- 0.0752（M）;其中F、SNF和M分别表示为脂肪、非脂肪固体和乳的磅数。该方程能与正常奶一样准确地预测受日粮影响的产低脂奶奶牛的产奶量。Gaines 4%FCM方程低估了脂肪含量低于3%的牛奶的能量输出高达15%。
The quantification of lactation response requires that various yields of milk of various chemical compositions be equated to a common term. Although the gross energy value is the most common characteristic to which all organic substances can be reduced, its direct measurement is expensive. As a consequence, a study was made of the relationships among the energy value and the concentrations of total solids, solids-not-fat (SNF), fat, protein, lactose and ash in 600 2- and 7-day composite samples of milk from 42 Holstein coes and ranging from 1.6 to 6.4% fat. An analysis of 21 different combinations of milk components showed that the most practical equation for the accurate prediction (C.V. = 1.3%) of the energy value of milks having a wide range of chemical composition is: Energy (kcal/lb) = 41.84 (% fat) + 22.29 (% SNF) - 25.58. From this, the following equation was derived to compute the solids-corrected milk (SCM) yield containing 340 kcal of energy /pound: SCM (lb) = 12.3 (F) + 6.56 (SNF) - 0.0752 (M); where F, SNF, and M are expressed as pounds of fat, solids-not-fat, and milk, respectively. This equation predicted the milk energy output of cows preducing low-fat milk effected by dietary means as accurately as that of normal milk. The Gaines 4% FCM equation underestimated by as much as 15% the energy output in milk containing less than 3% of fat.