भाषा:

Milk energy & calcium calculator (दूध के लिए ऊर्जा और कैल्शियम)

Uses the NRC formula from this article. Filled with average milk: 3.5% fat, 3% protein, 4.8% lactose, 65% efficiency, 1.2 g calcium per litre, 38% absorption.

–ME per litre (Mcal)
–ME per day for milk (Mcal)
–Calcium per litre (g)
–Calcium per day for milk (g)

Only the extra need for milk. Maintenance, pregnancy and growth are added on top.

By Dr. Ibne Ali, IMN PyrophosUpdated October 20266 min read
How much metabolizable energy and calcium required for 1L milk

I remember that milk production in cows depends on several factors like the cow's breed, stage of lactation, diet, and the composition of the milk itself. But the question is specifically about ME and calcium per liter.

First, metabolizable energy. This is the energy available to the cow after digestion and absorption. So the energy needed for milk production would depend on the energy content of the milk. Milk has components like fat, protein, and lactose, each contributing to its energy content. We can calculate the energy in the milk and then determine how much ME the cow needs, considering that converting feed to milk isn't 100% efficient.

The energy in milk is often measured in megacalories (Mcal) per kilogram. Milk's energy can be estimated using formulas that take into account fat, protein, and lactose percentages.

The NRC (National Research Council) have a formula for this calculation. The general formula is like (0.0929 × % fat) + (0.0547 × % protein) + (0.0395 × % lactose) all multiplied by the weight of the milk. Since 1 liter of milk is roughly 1.03 kg (because the density is a bit higher than water), we should use that.

Let's assume average milk composition. If a cow's milk has around 3.5% fat, 3% protein, and 4.8% lactose, then plugging those into the formula: (0.0929 x 3.5) + (0.0547 x 3) + (0.0395 x 4.8).

Let us calculate each part:

0.0929 x 3.5 = 0.32515

0.0547 x 3 = 0.1641

0.0395 x 4.8 = 0.1896

Adding those up:

0.32515 + 0.1641 + 0.1896 = 0.67885 Mcal/kg.

Then multiply by 1.03 kg (for 1 liter) gives –

0.67885 x 1.03 ≈ 0.699 Mcal per liter.

So the milk itself has about 0.7 Mcal of energy. But that's the gross energy. The cow needs metabolizable energy, which accounts for the efficiency of converting feed energy into milk energy. The efficiency is around 60-70% for dairy cows.

Conversion efficiency for ME to milk energy is typically about 60-65%.

So if the milk has 0.7 Mcal, then the ME required would be 0.7 divided by 0.65 (assuming 65% efficiency), which is roughly 1.077 Mcal per liter.

So approximately 1.08 Mcal of ME per liter of milk. But this can vary based on the actual efficiency, which might depend on the diet and other factors.

Now for calcium. Milk contains calcium, so the amount needed would be the calcium content in the milk plus any consideration for absorption efficiency.

Milk typically has about 1.2 grams of calcium per liter. However, cows don't absorb all the calcium they consume. The absorption efficiency can vary, but let's say it's around 50% for a lactating cow.

So if the milk has 1.2 g, the cow needs to intake 1.2 / 0.5 = 2.4 grams of calcium per liter. Although there's also maintenance requirements for calcium, but we just consider the direct calcium lost in the milk adjusted for absorption (dairy cows require about 0.1 to 0.12 grams of calcium per kilogram of body weight for maintenance, but that's separate from milk production).

Since we only concern with requirement specifically for milk production, we can focus on the milk's calcium content and the absorption rate. So if milk has 1.2 g Ca per liter and absorption is 50%, then the requirement is 2.4 g. However, some sources sources says different absorption efficiency, like 30-40% during lactation. If absorption is lower, say 40%, then it would be 1.2 / 0.4 = 3 g per liter.

Looking up some references (in my mind, since I can't actually recall), the NRC (2001) for dairy cattle suggests that the calcium requirement for milk production is calculated by taking the calcium content in milk divided by the absorption coefficient. The absorption coefficient for calcium in lactating cows is approximately 0.38 (38%).

So if milk has 1.23 g Ca per kg (and 1 liter is ~1.03 kg), that's 1.23 x 1.03 ≈ 1.27 g Ca per liter.

Then divided by 0.38 gives roughly 3.34 g of dietary calcium needed per liter. So about 3.3 to 3.5 grams of calcium per liter of milk. However, different sources might round these numbers. Some may say approximately 3-3.5 grams of calcium per liter.

But some might use a slightly different absorption coefficient, so values between 3 and 4 grams per liter are common in recommendations.

Putting it all together, metabolizable energy required is approximately 1.08 Mcal per liter, but often rounded to 1.1 Mcal, and calcium is around 3.2 grams, often rounded to 3.2-3.5 grams per liter.

However, these values can vary based on milk composition and the cow's specific efficiency. For example, higher fat milk would require more energy. If the milk has 4% fat instead of 3.5%, the energy content would be higher, thus increasing the ME requirement. Similarly, if calcium content in milk is higher, the requirement would adjust accordingly.

Therefore, the final answer should present these estimates with the caveat that actual values can vary based on factors like milk composition and individual cow metabolism. But providing average values based on typical milk composition and standard conversion efficiencies.

To determine the metabolizable energy (ME) and calcium required for 1 liter of milk production in cows, we consider the following:

Dudh Dhara IMN Pyrophos

More milk

Dudh Dhara

Milk production booster with glucogenic precursors, beta glucans and yeast extract. Supports milk, fat and SNF, positive energy balance, conception and immunity.

Dose: 10–15 g per adult cow or buffalo per day; 2–3 g per sheep or goat; or 200–250 g per 100 kg concentrate.

1 kg ₹1,150MRP ₹1,410

1. Metabolizable Energy (ME):

Milk Energy Content:

Milk energy is calculated using its components (fat, protein, lactose). For average milk (3.5% fat, 3% protein, 4.8% lactose): Energy (Mcal/kg)=(0.0929×3.5)+(0.0547×3)+(0.0395×4.8)=0.68 Mcal/kg.Energy (Mcal/kg)=(0.0929×3.5)+(0.0547×3)+(0.0395×4.8)=0.68Mcal/kg.Adjusting for 1 liter (~1.03 kg): 0.68×1.03≈0.7 Mcal/liter.0.68×1.03≈0.7Mcal/liter.

Conversion Efficiency:

Cows convert ME to milk energy at ~60–65% efficiency. Using 65%: ME Required=0.70.65≈1.08 Mcal/liter.ME Required=0.650.7​≈1.08Mcal/liter.

Final Estimate: 1.1 Mcal of ME per liter (rounded up due to variability in efficiency and milk composition).

Pyromin IMN Pyrophos

Chelated minerals

Pyromin

Chelated mineral mixture with iron, manganese, copper, zinc, iodine, selenium, chromium, cobalt and magnesium, vitamins A, D3, E, K and B vitamins, biotin, methionine, lysine, lactobacillus and yeast extract. Supports milk production, fertility, conception, immunity and feed efficiency.

Dose: Adult cow or buffalo 10 g per day; calves, sheep and goats 3 g per day. As a premix, 100 g per 100 kg of concentrate.

1 kg ₹655MRP ₹1,190

2. Calcium (Ca):

Calcium in Milk: Milk contains ~1.2 grams of calcium per liter.

Absorption Efficiency: Lactating cows absorb ~38% of dietary calcium. Thus: Dietary Ca Required=1.20.38≈3.2 g/liter.

Final Estimate: 3.2–3.5 grams of calcium per liter (varies with absorption rates and milk calcium content).

Key Considerations:

Milk Composition: Higher fat/protein increases ME demand (e.g., 4% fat milk requires ~1.2 Mcal/liter).

Cow Physiology: Breed, lactation stage, and diet influence efficiency.

Guidelines: NRC recommends adjustments based on individual herd metrics.

Summary:

ME: 1.1 Mcal/liter

Calcium: 3.2–3.5 g/liter

These values are averages; precise requirements depend on specific conditions.

For proper feed formulation & consultation you can contact us, we provide you step step by guidance which would help you improve the productivity and efficiency of your animals.

Contact on whatsapp or call 9871584101

Need help with feeding or a health problem in your cows or buffaloes? Message Dr. Ibne Ali on WhatsApp.

WhatsApp: 98715 84101
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