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May 22, 2026, 12:11 AM

TSI (Triple Sugar Iron) Test 🧪🦠
The TSI (Triple Sugar Iron) test is a commonly used biochemical test in microbiology laboratories to identify and differentiate Gram-negative enteric bacteria, especially bacteria belonging to the Enterobacteriaceae family. The test helps microbiologists understand how bacteria use carbohydrates and whether they produce certain metabolic products.

Instead of identifying bacteria directly, TSI gives a metabolic fingerprint of the organism by showing:
🍬 Whether the bacterium ferments sugars
💨 Whether gas is produced during fermentation
🖤 Whether hydrogen sulfide (H₂S) is produced

This information narrows down bacterial identification.

Triple Sugar Iron 🤔
The name "Triple Sugar Iron" comes from the components of the medium:
🍭 Triple sugars
Glucose
Lactose
Sucrose

⚫ Iron compounds
Used to detect hydrogen sulfide production

Principle of the TSI test 🔬
The principle of the TSI test is based on bacterial metabolism.
Different bacteria have different abilities to:
🍬 Ferment carbohydrates
💨 Produce gas
🖤 Produce H₂S
When bacteria metabolize sugars, they produce organic acids, causing the medium to become acidic.

The TSI medium contains a pH indicator called phenol red, which changes color according to pH:
🟡 Acidic pH - yellow color
🔴 Alkaline pH - red or pink color
By observing these color changes, we can determine the biochemical behavior of bacteria.

Components of TSI medium 🧫
🍬 Sugars
The medium contains three sugars:
Glucose (0.1%)
Glucose is present in a small amount.

Lactose (1%)
Present in larger quantity.

Sucrose (1%)
Present in larger quantity.
The concentration difference is very important because it allows differentiation of organisms.

🌈 Phenol red indicator
Phenol red acts as a pH indicator.
When bacteria produce acid:
🟡 Medium becomes yellow

When bacteria produce alkaline products:
🔴 Medium becomes red
⚫ Sodium thiosulfate
This acts as a sulfur source for hydrogen sulfide production.
Some bacteria can break sulfur compounds and produce H₂S gas.

⚫ Ferrous sulfate
Ferrous sulfate reacts with hydrogen sulfide gas:
H₂S + Iron → Ferrous sulfide
This reaction forms:
🖤 Black precipitate

🧫 Agar
The agar is prepared in a tube with two parts:
⬆️ Slant portion
Contains oxygen (aerobic region)

⬇️ Butt portion
Contains little oxygen (anaerobic region)
The two regions help observe bacterial reactions under different oxygen conditions.

Tube have a slant and butt 🤔
This is a very important feature.
Slant region ⛰️
The slant surface is exposed to air.
Therefore:
🌬️ Oxygen is present
Bacteria can perform aerobic metabolism here.

Butt region ⬇️
The butt is deep inside the tube.
Therefore:
🚫 Very little oxygen
Bacteria perform anaerobic metabolism.
This creates two environments in one tube and provides more information about bacterial metabolism.

Procedure of TSI test 🔍
Step 1️⃣
Prepare sterilized TSI agar tubes.
Step 2️⃣
Take a sterile inoculating needle.
Step 3️⃣
Pick a bacterial colony from culture.
Step 4️⃣
Stab the center of the tube vertically to the bottom.
Purpose:
⬇️ Introduce bacteria into the anaerobic butt region.
Step 5️⃣
Withdraw the needle and streak along the slant surface.
Purpose:
⬆️ Introduce bacteria to the aerobic region.
Step 6️⃣
Incubate the tube:
🌡️ 35–37°C
⏰ 18–24 hours
Step 7️⃣
Observe:
🎨 Color changes
💨 Gas formation
🖤 Black precipitate

Interpretation of TSI reactions 📖
A/A reaction (Acid/Acid) 🟡🟡
Slant - Yellow
Butt - Yellow
Meaning:
✅ Glucose fermented
✅ Lactose fermented and/or sucrose fermented

Initially bacteria ferment glucose.
Acid forms and entire tube becomes yellow.
Since lactose and sucrose are present in larger amounts, bacteria continue fermenting them and keep producing acid.

As a result:
🟡 Entire tube remains yellow
Examples:
🦠 Escherichia coli
🦠 Klebsiella pneumoniae

K/A reaction (Alkaline/Acid) 🔴🟡
Slant - Red
Butt - Yellow
Meaning:
✅ Only glucose fermented

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STAR VET BOOKS

May 22, 2026, 12:11 AM

Question ⁉️
Lumpy Skin Disease (LSD) is caused by a virus belonging to which genus?
A) Orthopoxvirus
B) Parapoxvirus
C) Capripoxvirus
D) Avipoxvirus

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May 22, 2026, 12:11 AM

Black quarter is caused by:

A. Bacillus anthracis
B. Clostridium tetani
C. Clostridium chauvoei
D. Pasteurella multocida

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May 22, 2026, 12:11 AM

Avian influenza specially highly pathogenic type is commonly caused by
A. H9N2 B. H5N1
C. H2N2 D. None

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May 22, 2026, 12:11 AM

The best method for control of hydatid disease is:

A. Tick control
B. Dog deworming
C. Vaccination of poultry
D. Isolation of birds

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May 22, 2026, 12:11 AM

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May 22, 2026, 12:11 AM

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May 22, 2026, 12:11 AM

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May 22, 2026, 12:11 AM

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May 22, 2026, 12:11 AM

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May 7, 2026, 10:54 AM

SILAGE MAKING: PRESERVE GRASS FOR YEAR-ROUND LIVESTOCK FEED

Every farmer knows the pain: during the dry season, livestock feed becomes scarce and expensive. The solution is silage — preserved green fodder that keeps animals healthy all year. Here’s a complete step-by-step guide with exact quantities and timings.

1. Choosing the Right Forage

Best options: Napier grass, maize, sorghum, or sweet potato vines.
Grass should be fresh, tender, and disease-free. Avoid overly mature or dry material.

2. Cutting and Chopping

Cut grass 2–3 inches above the ground to avoid soil contamination.
Chop into 1–2 cm pieces for proper compaction and fermentation.
For maize, cut before tasseling when moisture content is around 65–70%.

3. Additives for Better Fermentation

Molasses: Add 50 kg per 1 ton of chopped grass.
Lactic acid bacteria inoculant: Add according to manufacturer’s instructions (usually 100 g per 1 ton of forage).
Water: Sprinkle 20–30 liters per ton if material is dry, to maintain moisture at 60–70%.

4. Filling and Compacting the Silo.

Use a pit, trench, or bag silo.
Fill quickly after chopping to minimize exposure to air.
Compact firmly:
Manual: Use poles to press tightly.
Tractor: One tractor per 5 m³ of silage.
Remove air pockets — oxygen causes spoilage.

5. Sealing the Silo

Cover with heavy-duty plastic sheet and weigh down with tires or sandbags.
Ensure airtight seal to prevent fermentation failure.

6. Fermentation

Duration: 21–30 days at ambient temperature.
Good silage: sweet smell, light green to yellow color, moist texture.
Avoid brown, black, or rotten-smelling silage.

7. Feeding

Introduce gradually to livestock.
Feed fresh from silo. Can be used for cattle, goats, sheep, and pigs.

✅ Key Tip: Proper silage reduces feed costs, maintains livestock health, and ensures year-round fodder availability.

STAR VET BOOKS

May 7, 2026, 10:54 AM

🚨 IF YOU'RE GOING TO SNATCH AND DON'T BLOCK THE CORNIAL NERVE... THE ANIMAL DOES FEEL PAIN Swagx Vet Clinic

🐄 CORNUAL NERVO: THE KEY TO PAINLESS DISORDER
The cornial nerve is responsible for bringing sensitivity from the horn to the brain. If not blocked properly, any discarding procedure will be painful, even if done quickly.
🧠 WHERE IS THE CORNIAL NERVO?
This nerve:
is a branch of the trigeminal nerve,
Runs the lateral region of the head,
happens between the eye and the base of the horn.
👉 It is located approximately on the line that connects:
side edge of the eye → base of the horn
That's where the anesthetic blockage is done.
💉 WHY IS IT SO IMPORTANT TO BLOCK IT?.
Because when applying anesthesia (like lidocaine) at that point:
✅ horn sensitivity is removed
✅ the animal does not perceive pain during the scourge
✅ reduces stress
✅ improve handling of procedure
It's not luxury, it's right management.
⚠️ WHAT HAPPENS IF YOU DON'T BLOCK?
Immediate intense pain
Sudden movements of the animal
Higher risk of injury
Severe stress
Slower recovery
👉 The animal doesn't "get used to", it just suffers the procedure.
⏱️ EFFECT OF ANESTHESIA
Start: 5-10 minutes
Duration: Enough to perform the rant
Locked area: skin, horn base and surrounding tissue
Additional reinforcement or locking may be required on some large animals.
🐄 IMPORTANT DETAIL IN ADULTS
In adult bovines:
👉 there may be additional irritation from other nerves
Therefore, in more complex abnormalities, the blockage should be more complete to avoid residual pain.
🧠 KEY IDEA
Disconnection is not just cutting the horn...
👉 is a procedure that should include pain control.
And the cornial nerve is the key point to achieving it.
📌 FINAL MESSAGE
A well-made scorn is not measured just by how the horn looks...
👉 is measured by how the animal's pain is handled during the process.
Because in modern cattle farming.

STAR VET BOOKS

May 7, 2026, 10:54 AM

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May 7, 2026, 10:54 AM

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May 7, 2026, 10:54 AM

የጥጃ ሞት እያሰቸገራችሁ ነው??
======================
በአዲስ አበባ ዙሪያ ባሉ የወተት እርሻዎች ላይ የጥጃ ሞት ለገበሬዎች ትልቅ ፈተና መሆኑ ይታወቃል። ችግሩ አብዛኛውን ጊዜ ከአያያዝ፣ ከበሽታ እና ከአካባቢ ጥበቃ ጉድለት ጋር የተያያዘ ነው።
በአካባቢው ለጥጃ ሞት ዋነኛ መንስኤ የሚሆኑት ነጥቦችና መፍትሄዎቻቸው የሚከተሉት ናቸው፡

1. ዋነኛ የሞት መንስኤዎች
✅ተቅማጥ (Calf Scours): በጥጃዎች ህይወት የመጀመሪያ ሳምንታት ውስጥ የሚከሰት ሲሆን፣ በባክቴሪያ (እንደ E. coli)፣ በቫይረስ ወይም በንጽህና መጓደል ሊመጣ ይችላል።
✅የሳምባ ምች (Pneumonia): አዲስ አበባ አካባቢ ያለው ብርድና እርጥበት አዘል አየር፣ እንዲሁም የጥጃዎች ማደሪያ ቤት በቂ አየር የማይዘዋወርበት ከሆነ ለሳምባ ምች ያጋልጣቸዋል።
✅የእንብርት ኢንፌክሽን (Navel Ill): ጥጃው እንደተወለደ እንብርቱ በትክክል ካልታከመ ባክቴሪያ ወደ ሰውነቱ በመግባት ለሞት ሊዳርገው ይችላል።
✅የእንገር ወተት (Colostrum) እጥረት: ጥጃው በተወለደ በመጀመሪያዎቹ ጥቂት ሰዓታት ውስጥ በቂ የእንጀራ ወተት ካላገኘ በሽታ የመከላከል አቅሙ ደካማ ይሆናል።

2. የመከላከያ መንገዶች
የችግሩ አይነትመፍትሄውየተቅማጥ መከላከልየጥጃ መመገቢያ ዕቃዎችን በንጽህና መያዝ እና የመኖሪያ አካባቢን ማድረቅ።የሳምባ ምች መከላከልጥጃዎችን ከቅዝቃዜና ከረቂቅ ነፋስ መከላከል፤ ነገር ግን ንጹህ አየር እንዲያገኙ ማድረግ።የእንብርት እንክብካቤጥጃው እንደተወለደ እንብርቱን በአዮዲን (Iodine) መዘፈቅ።የእንጀራ ወተትጥጃው በተወለደ በ1-2 ሰዓታት ውስጥ ቢያንስ 2 ሊትር የእንጀራ ወተት እንዲጠጣ ማድረግ።
3. ምክረ-ሀሳብ
በአዲስ አበባ ዙሪያ ያሉ አርቢዎች የጥጃ ሞትን ለመቀነስ የሚከተሉትን ነጥቦች ትኩረት እንዲሰጡ ይመከራል፡
ማሳሰቢያ: ጥጃው የመዛል፣ የመተኛት ወይም ወተት የመተው ምልክት ካሳየ በአቅራቢያዎ የሚገኝ የእንስሳት ሐኪም በፍጥነት ማማከር ወሳኝ ነው።

➡️ክትባት: ላሞቹ ከመውለዳቸው በፊት ተገቢውን ክትባት እንዲያገኙ ማድረግ ጥጃው በሽታ የመከላከል አቅም ይዞ እንዲወለድ ይረዳል።
ንጽህና: የጥጃዎች ማደሪያ ሁልጊዜ ደረቅና ንጹህ መሆኑን ማረጋገጥ።

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May 7, 2026, 10:54 AM

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Milk Quality test

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May 7, 2026, 10:54 AM

🎥 Video

Haemonchosis

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May 7, 2026, 10:54 AM

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May 7, 2026, 10:54 AM

Incubator provides:
A. Sterilization
B. Controlled temperature
C. Oxygen removal
D. Nutrients

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May 7, 2026, 10:54 AM

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Apr 20, 2026, 02:54 PM

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Dog vomit color Guide.

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STAR VET BOOKS

Apr 7, 2026, 03:38 AM

The disease “Surra” is caused by:
A. Trypanosoma brucei
B. Trypanosoma evansi
C. Trypanosoma cruzi
D. Leishmania donovani

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Apr 7, 2026, 03:38 AM

📷 Photo

Dhukkuba Abbaa Gorbaa/Bilaakleegii

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Apr 7, 2026, 03:38 AM

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Artificial Insemination techniques procedure in cow 🐮 🐮 🐮 🐮 🐮 🐮

key stages of the procedure:

(1) ​Preparation and Semen Handling: Showing how frozen semen is carefully prepared for the procedure.

(2) ​Palpation and Location: Illustrating how the technician guides the insemination rod by rectally palpating the reproductive tract to locate the cervix.

(3) ​Passing the Cervix: A close-up view of the semen being prepared for deposition into the uterus.

(4) ​Deposit Semen: A detailed look at the safe and precise placement of the semen within the uterine body.

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Apr 7, 2026, 03:38 AM

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Diseases with recommended drugs

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Apr 7, 2026, 03:38 AM

Dhukkuba Abbaa Gorbaa/Bilaakleegii

Dhukkubni Abbaa Gorbaa dhukkuba baakteriaa irra caalatti baakteeriyaa Kiloostiriidiyeem choovee jedhamu sanyii Giraam-pozetiivii ta'een dhufuudha.

Bineeldota addunyaarra jiran irratti kan mul'atuudh. Yeroo hedduu loon, hoolaa fi re'oota miidha.

Saaxilamummaa:

Dhukkubni kun loon umrii ji'a jahaa hanga waggaa lamaa jiran irratti miidhaa cimaa geessisa. Keessattuu, loon nyaata fooyya'aa nyaatanii fi qaama gaarii qaban dhukkuba kanaaf saaxilamoodha.

Ka'uumsa dhukkubichaa:

Dhukkubni Abbaa gorbaa infeekshiinii baakteeriyaa Kiloostriidiyeemiitiin dhufa. Irra caalatti dhukkubni kun Kiloostiriidiyeem chooveen kan dhufu yoo ta'u, kana malees K. septikam, K. sordeelii fi K. nooviinis ni dhufa.

Mallattoolee dhukkubichaa:

Yeroo infeekshiniin eegalu beeyiladarratti hoo'i ol ka'aan ni uumama. Lukni iita'uu fi hokkolli luka miidhame kanarratti ni mul'ata. Yeroo dhiibbaan irra gahu sagaleen akka waraqaa gogaa bakka miidhamee jalaa ni dhagahama.

Qorannoo/Dx:

Qorannoon mallattoolee dhukkubichaa fi argannoo qaama du'eerratti gaggeeffama.

Qorannoon dirreerratti gaggeeffame agarsiisa laabraatoorii Kiloostiriidiyeem chooveetiin mirkanaa'a.

Waldhaansa/Rx:

Waldhaansi dhukkubichaa qorichoota kennuu fi bakka dhukkubaan miidhame yaaluun kan taasifamuudha

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