Frequently Asked Questions

What makes MVE semen tanks a good choice for cryogenic storage?

MVE semen tanks are designed with high-quality materials, advanced insulation technology, and low liquid nitrogen consumption, making them reliable for storing semen and embryos for dairy and beef cattle breeding. They are built for durability, with features like rugged aluminum construction and magneformed neck tubes for structural integrity. They also come in various sizes to suit different storage needs, from small portable units to larger tanks, and are trusted by leading breeding facilities for preserving valuable genetic material.

How long can MVE semen tanks hold liquid nitrogen? 

The holding time varies by model. For example, the MVE XC 20 Signature tank has a static hold time of about 20 weeks (135 days) and can store 660 ½ cc straws. Larger tanks like the MVE XC 34/18 have different capacities and holding times. Actual holding times depend on usage frequency, atmospheric conditions, and maintenance practices.

This quick chart will illustrate the different hold times....links are not active but you can see the same chart on the home page WITH clickable links.

Can I transport an MVE semen tank in my vehicle?

Yes, it’s safe to transport an MVE semen tank in a vehicle’s passenger compartment if the lid is securely closed and the tank is fastened, such as with a seatbelt, to prevent movement. Modern vehicles provide enough air circulation to handle minimal nitrogen venting. For transport in a trunk or truck bed, ensure the tank is secured with straps or in a box to avoid tipping or rolling, which can damage the tank

How should I store an MVE semen tank to maximize its lifespan? 

Store the tank in a well-lit, well-ventilated, clean, and dry area to prevent moisture buildup and facilitate monitoring. Avoid placing it directly on concrete, as the alkalis in concrete can react with the aluminum base, causing corrosion and vacuum loss. Instead, use a wooden pallet, rigid foam, or a roller base. Keep the tank cold with liquid nitrogen, even when not storing samples, to maintain its condition

How often should I check the liquid nitrogen levels in my MVE tank?

Check nitrogen levels (with measuring stick) weekly or biweekly and keep a record to detect any issues early. Levels should stay around the top of the canisters. Frequent opening of the tank (e.g., 48 canisters pulled daily vs. 18) can reduce holding time by about a month, so adjust monitoring based on usage. Never let the nitrogen level drop below 25% to avoid sample loss. 

What are signs that my MVE semen tank might be failing?

A key warning sign is frost buildup around the neck or exterior of the tank, indicating vacuum loss and rapid nitrogen evaporation. This can compromise semen quality and requires immediate action, such as transferring samples to another tank. Regular monitoring of nitrogen levels and visual inspections for frost can help detect problems early

Can I repair a tank that has lost its vacuum?

Yes, vacuum restoration is possible for MVE tanks, but it’s costly. If the tank is old or its history is unknown, replacing it may be more economical, especially for valuable genetic material. Consult your distributor or semen broker to assess the tank’s condition.

A good company to look to for repair of your tanks is Pioneer Industries.

Repairs are $250.00 and there is a 90 day warranty.

How do I maintain the neck cork and why is it important?

Inspect the neck cork monthly, as it’s handled frequently and can wear out. A shiny or damaged cork increases nitrogen boil-off by 20–30%, allowing more heat into the tank. Replace it promptly if worn. (Check Here for Spare Parts) Ensure the cork is replaced after each use to prevent debris or moisture from affecting it, which could cause freezing in the neck tube

What is the lifespan of an MVE semen tank?

With proper care, an MVE semen tank can last 10–15 years. Factors like excessive movement, storage on concrete, or failure to monitor nitrogen levels can shorten its life. Following maintenance tips, such as securing the tank during transport and keeping it cold, helps extend its lifespan.

Can I use an MVE vapor shipper for daily operations?

While possible, vapor shippers are more expensive and have shorter holding times than standard freezers like the MVE XC series. For daily use, a small freezer tank like the MVE XC 20 (refilled every 16-20 weeks) is more practical and cost-effective for artificial insemination technicians or small operations.

Are MVE tanks safe for storing embryos as well as semen?

Yes, MVE tanks are designed for cryopreservation of both semen and embryos. They maintain ultra-low temperatures (around -320°F) required for long-term storage of biological samples, making them ideal for artificial insemination and embryo transfer in breeding programs.

Is it safe to store a semen tank in a confined space, like a small barn office?

Avoid confined spaces due to the risk of nitrogen gas buildup, which can cause asphyxiation. Store tanks in well-ventilated areas. 

What factors should I consider when choosing a semen tank size (e.g., straw capacity, holding time, portability)?

Consider your herd size, breeding frequency, and storage duration. For small operations, a tank like the MVE XC 20 (660 ½ cc straws, 135-day hold time, 60 lbs full) is portable and sufficient. Larger operations may need the XC 47/11 (4,500 straws, 77-day hold time). Evaluate holding time (longer for less frequent refills), straw capacity, and portability (weight and size). Choose a tank slightly larger than current needs to accommodate growth.

What’s the difference between MVE XC storage tanks and vapor shippers?

MVE XC storage tanks (e.g., XC 20 Signature, XC 34/18) are designed for long-term storage with extended hold times (up to 20 weeks) and are ideal for stationary use. Vapor shippers (e.g., MVE SC 4/2V) use absorbent materials to hold liquid nitrogen vapor, allowing safe transport of samples for up to 2–3 weeks. Shippers are more expensive and have shorter hold times, making them less practical for daily use.

Are there specific tanks recommended for beginners vs. experienced AI technicians?

Beginners should opt for user-friendly, smaller tanks like the MVE  XC 20 SIGNATURE (660 straws, 135-day hold time) for ease of use and lower maintenance. Experienced technicians may prefer larger tanks like the XC 47/11-6 for higher capacity or vapor shippers for frequent transport. Beginners should prioritize tanks with clear canister systems and consult suppliers for training.

What are the benefits of wider vs. narrower neck tubes for semen tanks?

Wider neck tubes (e.g., MVE XC series) allow easier access to canisters, ideal for frequent straw retrieval, but may increase nitrogen evaporation slightly. Narrower neck tubes (e.g., MVE SC series) conserve nitrogen longer, suiting less frequent access, but can be harder to navigate. Choose based on how often you access the tank and your comfort with handling straws.

The tank I would suggest is the XC 20 Signature.  Price is $750.. Although it may sound much larger than you need, it is a good choice…It is also our least expensive and most popular tank.  

• It holds 660 1/2 cc straws
• Has a five year factory vacuum warranty
• Six cannisters
• Needs refilled every 20 weeks

·         Below are the full specs. 

·         Here is the link https://sementanks.com/products/xc-20-signature

This XC 20 SIGNATURE package deal is THE BEST DEAL money wise. 
Price $920 with FREE SHIPPING.  It has everything you need to keep your tank organized and looking good. 

It includes

• Tank with all six cannisters
• Measuring stick to measure liquid nitrogen levels
• Inventory packet with (6) inventory card and (2) tank refill log sheets
• Tank top - choose from 7 colors.  Get it blank or printed with your logo
• Cane Keeper Bag
• 15 canes and 30 goblets (your choice of 10 or 13 mm)
• Tweezers
• Black Sharpie Pen

·       Here is the link https://sementanks.com/collections/package-deals/products/xc-20-signature-tank-w-measuring-stick-inventory-packet-the-original-tank-top-cane-keeper-free-shipping

How do I sanitize and/or decontaminate my tank?

Sanitizing and Decontaminating Guide

How often should I refill my semen tank with liquid nitrogen?

Refill frequency depends on the tank’s holding time and usage. For example, an MVE XC 20 has a static hold time of about 20 weeks, but heavy use (e.g., frequent lid opening) may require refills every 1–2 months. Monitor levels closely and refill before they drop below 25% to protect samples. Use only high-purity liquid nitrogen to avoid contamination.

What precautions should I take when handling liquid nitrogen? 

Work in a well-ventilated area to avoid asphyxiation from nitrogen gas. Never seal the tank tightly during use, as pressure buildup can cause damage or injury. Follow supplier safety guidelines for filling and handling.

What should I do if I suspect sample damage due to tank issues?

If you notice frost, low nitrogen levels, or other signs of tank failure, transfer samples to a backup tank immediately to minimize risk. Check the tank’s vacuum and consult a professional to assess damage. Test a few straws for viability if possible, and contact your semen supplier for guidance on sample integrity.

Can I leave a semen tank empty for long periods?

It’s best to keep the tank cold with liquid nitrogen, even when not storing samples, to maintain the vacuum and prevent internal stress from temperature changes. This is not really practical in most situations. If the tank must be emptied, store it in a dry, ventilated area and inspect it before reuse. Refill slowly to avoid thermal shock.

How often should I check the liquid nitrogen levels in my MVE tank?

Check nitrogen levels weekly or biweekly and keep a record to detect any issues early. Levels should stay around the top of the canisters. Frequent opening of the tank (e.g., 48 canisters pulled daily vs. 18) can reduce holding time by about a month, so adjust monitoring based on usage. Never let the nitrogen level drop below 25% to avoid sample loss.

Check out our Inventory Packet...it contains "old school" charts to keep your tank organized and keep track of refill dates.

How do I safely retrieve a semen straw without damaging others in the canister?

Use long, insulated tweezers to lift a single straw from the goblet, keeping the canister below the frost line. Work quickly (under 10 seconds) to avoid temperature spikes. Avoid shaking or tilting the canister, as this can dislodge straws. Return the canister immediately after retrieval.

What is the frost line, and why is it important to keep straws below it?

The frost line is the visible boundary in the tank’s neck tube where the temperature is -130°F, critical for maintaining semen viability. Straws raised above this line risk warming, which can reduce sperm motility. Always keep canisters below the frost line during access, using a flashlight to locate straws if needed.

Can I store embryos and semen in the same tank, and if so, how?

Yes, MVE tanks can store both semen and embryos, as both require temperatures below -130°F. Store embryos in separate, clearly labeled canisters to avoid confusion. Ensure embryos remain in liquid nitrogen (not vapor) for long-term storage, as they are more sensitive to temperature fluctuations. Consult your supplier for specific goblet sizes for embryos.

Where can I purchase high-purity liquid nitrogen for my semen tank?

Contact local welding gas suppliers, medical gas providers, or agricultural co-ops for high-purity (99.9%) liquid nitrogen. SemenTanks.com can provide a list of regional suppliers or connect you with trusted vendors. Avoid industrial-grade nitrogen, which may contain impurities harmful to samples.

How do I arrange a liquid nitrogen refill schedule with a supplier?

Work with your supplier to set a refill schedule based on your tank’s hold time (e.g., every 2–3 months for an MVE XC 20 under normal use). Provide your tank model and usage frequency to estimate needs. Arrange for on-site delivery or pickup, and monitor levels weekly to adjust as needed.

How can I tell if my tank needs a refill sooner than expected?

Monitor nitrogen levels weekly with a dipstick. If levels drop below the canister tops or faster than the tank’s rated hold time (e.g., 135 days for XC 20), it may indicate frequent access or vacuum issues. Check for frost on the exterior, a sign of vacuum loss, and refill promptly to protect samples.

What are the current warranties on your MVE tanks?

Storage Tanks - 5 Year Vacuum Warranty
Vapor Shippers - 3 Year Vacuum Warranty
Doble Series - 3 Year Vacuum Warranty
Lab Units - 3 Year Vacuum Warranty
Cryocubes - 1 Year Vacuum Warranty

Chart/MVE Warranty Statement

What AI supplies (e.g., thaw units, insemination rods, gloves) do you recommend for use with MVE tanks?

SemenTanks.com offers thaw units (e.g., Cito Thaw), insemination rods (½ cc or ¼ cc), and nitrile gloves for safe handling. A basic kit includes a thaw unit, AI gun, sheaths, and tweezers for straw retrieval.

Insemination and Storage Supplies

How do I choose the right goblets, canes, or cane tabs for my tank?

Use 10 mm or 13 mm goblets for standard semen straws, paired with aluminum canes (available in 10 mm or 13 mm sizes). Cane tabs should be durable and color-coded for easy identification. SemenTanks.com offers MVE-compatible goblets and canes; specify your tank model when ordering.

Insemination and Storage Supplies

Are there specific thawing techniques or equipment needed for semen stored in MVE tanks?

Thaw straws in a water bath at 95–98°F for 30–45 seconds using a thaw unit (available from SemenTanks.com). Avoid air thawing or excessive heat, which can damage sperm. Use a thermometer to monitor water temperature and transfer thawed straws to an AI gun within 5 minutes.

Insemination and Storage Supplies

What does shipping cost?

We recently implemented a flat fee shipping schedule.  Smaller tanks cost a flat $25 to ship. Larger tanks, a flat fee of $49 - $60 will apply.  This represents a huge savings to our customers.

How are semen tanks shipped, and what should I expect upon delivery?

MVE tanks are shipped empty (no liquid nitrogen) usually via UPS ground transport in protective packaging to prevent damage. Expect delivery within 5 - 10  business days, depending on location. SemenTanks.com provides tracking information and instructions for inspecting the tank upon arrival.

Can tanks be shipped pre-filled with liquid nitrogen?

Standard storage tanks (e.g., MVE XC series) cannot be shipped pre-filled from the factory due to safety regulations. All tanks shipped from the factory come empty.