diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 1f96075..fcaf55f 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -4,20 +4,7 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="7c107abe-5995-4428-8429-b146aaca8386" name="Changes" comment="feat : système de blocage utilisateur">
-      <change afterPath="$PROJECT_DIR$/migrations/Version20260325142815.php" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/Security/UserChecker.php" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/State/ActiveUsersProvider.php" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/CHANGELOG.md" beforeDir="false" afterPath="$PROJECT_DIR$/CHANGELOG.md" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/config/packages/security.yaml" beforeDir="false" afterPath="$PROJECT_DIR$/config/packages/security.yaml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/config/reference.php" beforeDir="false" afterPath="$PROJECT_DIR$/config/reference.php" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/pages/admin/user/[[id]].vue" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/pages/admin/user/[[id]].vue" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/pages/admin/user/list.vue" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/pages/admin/user/list.vue" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/services/dto/user-data.ts" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/services/dto/user-data.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/stores/auth.ts" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/stores/auth.ts" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/Entity/User.php" beforeDir="false" afterPath="$PROJECT_DIR$/src/Entity/User.php" afterDir="false" />
-    </list>
+    <list default="true" id="7c107abe-5995-4428-8429-b146aaca8386" name="Changes" comment="feat : update CHANGELOG.md" />
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
@@ -48,7 +35,7 @@
   <component name="Git.Settings">
     <option name="RECENT_BRANCH_BY_REPOSITORY">
       <map>
-        <entry key="$PROJECT_DIR$" value="fix/FER-11-corriger-le-probleme-de-bearer-token" />
+        <entry key="$PROJECT_DIR$" value="feature/FER-12-ajouter-un-blocage-des-utilisateurs" />
       </map>
     </option>
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
@@ -239,7 +226,7 @@
     "RunOnceActivity.TerminalTabsStorage.copyFrom.TerminalArrangementManager.252": "true",
     "RunOnceActivity.git.unshallow": "true",
     "RunOnceActivity.typescript.service.memoryLimit.init": "true",
-    "git-widget-placeholder": "feature/FER-12-ajouter-un-blocage-des-utilisateurs",
+    "git-widget-placeholder": "feature/FER-13-faire-des-recherches-sur-le-scanner-des-betes",
     "last_opened_file_path": "//wsl.localhost/Ubuntu-24.04/home/m-tristan/workspace/Ferme",
     "node.js.detected.package.eslint": "true",
     "node.js.detected.package.tslint": "true",
@@ -333,39 +320,7 @@
       <workItem from="1773766075191" duration="6202000" />
       <workItem from="1773824491213" duration="24805000" />
       <workItem from="1774275549972" duration="51000" />
-      <workItem from="1774276665015" duration="16178000" />
-    </task>
-    <task id="LOCAL-00032" summary="fix : redirige sur le login sur une 401 et reset du auth state + doc + timeout du toaster">
-      <option name="closed" value="true" />
-      <created>1769100048933</created>
-      <option name="number" value="00032" />
-      <option name="presentableId" value="LOCAL-00032" />
-      <option name="project" value="LOCAL" />
-      <updated>1769100048933</updated>
-    </task>
-    <task id="LOCAL-00033" summary="feat : ajout de la debug bar en mod dev">
-      <option name="closed" value="true" />
-      <created>1769177611987</created>
-      <option name="number" value="00033" />
-      <option name="presentableId" value="LOCAL-00033" />
-      <option name="project" value="LOCAL" />
-      <updated>1769177611987</updated>
-    </task>
-    <task id="LOCAL-00034" summary="feat : ajout du bundle Malio ednotif pour l'utilisation des WS">
-      <option name="closed" value="true" />
-      <created>1769184861047</created>
-      <option name="number" value="00034" />
-      <option name="presentableId" value="LOCAL-00034" />
-      <option name="project" value="LOCAL" />
-      <updated>1769184861047</updated>
-    </task>
-    <task id="LOCAL-00035" summary="fix : modification de la conf du bundle ednotif">
-      <option name="closed" value="true" />
-      <created>1769434793487</created>
-      <option name="number" value="00035" />
-      <option name="presentableId" value="LOCAL-00035" />
-      <option name="project" value="LOCAL" />
-      <updated>1769434793487</updated>
+      <workItem from="1774276665015" duration="28381000" />
     </task>
     <task id="LOCAL-00036" summary="feat : update du CHANGELOG.md">
       <option name="closed" value="true" />
@@ -727,7 +682,39 @@
       <option name="project" value="LOCAL" />
       <updated>1774448105945</updated>
     </task>
-    <option name="localTasksCounter" value="81" />
+    <task id="LOCAL-00081" summary="feat : système de blocage utilisateur">
+      <option name="closed" value="true" />
+      <created>1774450388149</created>
+      <option name="number" value="00081" />
+      <option name="presentableId" value="LOCAL-00081" />
+      <option name="project" value="LOCAL" />
+      <updated>1774450388149</updated>
+    </task>
+    <task id="LOCAL-00082" summary="feat : ajout d'un système de scanner bovin">
+      <option name="closed" value="true" />
+      <created>1774543296474</created>
+      <option name="number" value="00082" />
+      <option name="presentableId" value="LOCAL-00082" />
+      <option name="project" value="LOCAL" />
+      <updated>1774543296474</updated>
+    </task>
+    <task id="LOCAL-00083" summary="feat : mise à jour du CLAUDE.md">
+      <option name="closed" value="true" />
+      <created>1774543626516</created>
+      <option name="number" value="00083" />
+      <option name="presentableId" value="LOCAL-00083" />
+      <option name="project" value="LOCAL" />
+      <updated>1774543626516</updated>
+    </task>
+    <task id="LOCAL-00084" summary="feat : update CHANGELOG.md">
+      <option name="closed" value="true" />
+      <created>1774543766582</created>
+      <option name="number" value="00084" />
+      <option name="presentableId" value="LOCAL-00084" />
+      <option name="project" value="LOCAL" />
+      <updated>1774543766582</updated>
+    </task>
+    <option name="localTasksCounter" value="85" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -777,9 +764,6 @@
     </option>
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="fix: corrections diverses" />
-    <MESSAGE value="fix : corrections diverses" />
-    <MESSAGE value="fix : corrections frontend" />
     <MESSAGE value="feat : affichage et modification expédition et modification bouton valider" />
     <MESSAGE value="fix : erreur customer adress et bouton valider oublie" />
     <MESSAGE value="feat : changelog update" />
@@ -802,7 +786,10 @@
     <MESSAGE value="fix : bouton de mise en attente" />
     <MESSAGE value="fix : problème de bearer token" />
     <MESSAGE value="feat : système de blocage utilisateur" />
-    <option name="LAST_COMMIT_MESSAGE" value="feat : système de blocage utilisateur" />
+    <MESSAGE value="feat : ajout d'un système de scanner bovin" />
+    <MESSAGE value="feat : mise à jour du CLAUDE.md" />
+    <MESSAGE value="feat : update CHANGELOG.md" />
+    <option name="LAST_COMMIT_MESSAGE" value="feat : update CHANGELOG.md" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8a75c7..bd79251 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -61,6 +61,7 @@ Ajouter dans le fichier .env du frontend
 * [#353] modification front admin utilisateur
 * [#FER-11] Corriger le problème de bearer token
 * [#FER-12] Ajouter un blocage des utilisateurs
+* [#FER-13] Faire des recherches sur le scanner des bêtes
 
 ### Changed
 
diff --git a/CLAUDE.md b/CLAUDE.md
index f1b2667..902346a 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -142,6 +142,15 @@ frontend/
 - `BuildingCase` a `bovines` (OneToMany).
 - Rapport PDF cases : `GET /building_cases/{id}/weights-report` → template Twig, projection depuis `arrivalDate`, gain journalier fixe `1.3 kg/jour`.
 
+### Scanner boucles auriculaires
+- Page dédiée `/scan` : scan de codes-barres Code 39/128 (boucles auriculaires bovines) depuis un téléphone Android via Chrome.
+- Utilise l'API native `BarcodeDetector` (Shape Detection API, Chrome Android 83+) — pas de lib JS, décodage hardware quasi-instantané.
+- **Non supporté sur iOS** (tous les navigateurs iOS utilisent WebKit, qui n'implémente pas `BarcodeDetector`).
+- Les 4 premiers caractères du code-barres sont retirés avant enregistrement (`rawValue.slice(4)`).
+- Composable `useBarcodeScanner` : caméra arrière, anti-doublon 2s, vibration au scan.
+- Le bovin est créé via `POST /bovines` avec `Content-Type: application/ld+json` (nécessaire pour la résolution d'IRI de `buildingCase`).
+- Sélection bâtiment → case (filtrées dynamiquement) avant de scanner.
+
 ### Données de référence
 - `ReceptionType`, `MerchandiseType`, `PelletType`, `Building`, `Supplier` (avec `Address` via join table, `createdBy` → User), `Customer` (avec `Address` via join table, `createdBy` → User), `Truck`, `Carrier`, `Driver`, `Vehicle`.
 - `Address` : champ `label` nullable (déprécié, retiré du front et du `address:write`), expose `fullAddress` via getter. `countryCode` par défaut `FR` côté front.
diff --git a/frontend/composables/useBarcodeScanner.ts b/frontend/composables/useBarcodeScanner.ts
new file mode 100644
index 0000000..e353a1f
--- /dev/null
+++ b/frontend/composables/useBarcodeScanner.ts
@@ -0,0 +1,113 @@
+import { ref, onUnmounted } from 'vue'
+
+declare global {
+    interface Window {
+        BarcodeDetector: new (options?: { formats: string[] }) => {
+            detect(source: HTMLVideoElement | ImageBitmapSource): Promise<{ rawValue: string }[]>
+        }
+    }
+    const BarcodeDetector: Window['BarcodeDetector'] | undefined
+}
+
+export function useBarcodeScanner(onDetected: (code: string) => void) {
+    const isSupported = ref('BarcodeDetector' in globalThis)
+    const isScanning = ref(false)
+    const error = ref<string | null>(null)
+
+    let detector: InstanceType<Window['BarcodeDetector']> | null = null
+    let stream: MediaStream | null = null
+    let animationFrameId: number | null = null
+    let lastDetectedCode = ''
+    let lastDetectedTime = 0
+
+    const COOLDOWN_MS = 2000
+
+    async function start(videoElement: HTMLVideoElement) {
+        if (!isSupported.value) {
+            error.value = 'BarcodeDetector non supporté. Utilisez Chrome sur Android.'
+            return
+        }
+
+        try {
+            detector = new BarcodeDetector({ formats: ['code_39', 'code_128'] })
+
+            stream = await navigator.mediaDevices.getUserMedia({
+                video: {
+                    facingMode: 'environment',
+                    width: { ideal: 1280 },
+                    height: { ideal: 720 }
+                }
+            })
+
+            videoElement.srcObject = stream
+            await videoElement.play()
+            isScanning.value = true
+            error.value = null
+
+            scanLoop(videoElement)
+        } catch (e) {
+            error.value = e instanceof Error ? e.message : 'Erreur lors du démarrage de la caméra'
+            isScanning.value = false
+        }
+    }
+
+    function scanLoop(videoElement: HTMLVideoElement) {
+        if (!isScanning.value || !detector) return
+
+        animationFrameId = requestAnimationFrame(async () => {
+            try {
+                if (videoElement.readyState >= HTMLMediaElement.HAVE_ENOUGH_DATA) {
+                    const barcodes = await detector!.detect(videoElement)
+
+                    if (barcodes.length > 0) {
+                        const code = barcodes[0].rawValue.slice(4)
+                        const now = Date.now()
+
+                        if (code !== lastDetectedCode || now - lastDetectedTime > COOLDOWN_MS) {
+                            lastDetectedCode = code
+                            lastDetectedTime = now
+
+                            if (navigator.vibrate) {
+                                navigator.vibrate(100)
+                            }
+
+                            onDetected(code)
+                        }
+                    }
+                }
+            } catch {
+                // Detection error on single frame, continue
+            }
+
+            scanLoop(videoElement)
+        })
+    }
+
+    function stop() {
+        isScanning.value = false
+
+        if (animationFrameId !== null) {
+            cancelAnimationFrame(animationFrameId)
+            animationFrameId = null
+        }
+
+        if (stream) {
+            stream.getTracks().forEach(track => track.stop())
+            stream = null
+        }
+
+        detector = null
+    }
+
+    onUnmounted(() => {
+        stop()
+    })
+
+    return {
+        isSupported,
+        isScanning,
+        error,
+        start,
+        stop
+    }
+}
diff --git a/frontend/i18n/locales/fr.json b/frontend/i18n/locales/fr.json
index 6746614..3d148c6 100644
--- a/frontend/i18n/locales/fr.json
+++ b/frontend/i18n/locales/fr.json
@@ -89,6 +89,9 @@
             "create": "Impossible de créer le type bovin.",
             "update": "Impossible de mettre à jour le type bovin."
         },
+        "bovine": {
+            "create": "Impossible d'enregistrer le bovin."
+        },
         "carrier": {
             "list": "Impossible de récupérer la liste des transporteurs.",
             "fetch": "Impossible de récupérer les données du transporteur",
@@ -146,6 +149,9 @@
             "update": "Type bovin mis à jour avec succès.",
             "create": "Type bovin créé avec succès."
         },
+        "bovine": {
+            "create": "Bovin enregistré avec succès."
+        },
         "weight": {
             "update": "Pesée mis à jour"
         }
diff --git a/frontend/layouts/default.vue b/frontend/layouts/default.vue
index 4b9e9e7..7021f6f 100644
--- a/frontend/layouts/default.vue
+++ b/frontend/layouts/default.vue
@@ -122,6 +122,23 @@
                             Bovins
                         </a>
                     </NuxtLink>
+
+                    <NuxtLink
+                        v-if="auth.isAdmin"
+                        to="/scan"
+                        custom
+                        v-slot="{ href, navigate }"
+                    >
+                        <a
+                            :href="href"
+                            @click="navigate"
+                            :class="route.path.startsWith('/scan')
+                            ? 'opacity-100'
+                            : 'opacity-65 hover:opacity-100 transition'"
+                        >
+                            Scanner
+                        </a>
+                    </NuxtLink>
                 </nav>
 
                 <!-- Spacer mobile (pour centrer visuellement le header si besoin) -->
@@ -218,6 +235,9 @@
                         <NuxtLink v-if="auth.isAdmin" to="/admin/bovin/bovin-list" @click="closeMenu">
                             Bovins
                         </NuxtLink>
+                        <NuxtLink to="/scan" @click="closeMenu">
+                            Scanner
+                        </NuxtLink>
                     </nav>
 
                     <button
@@ -231,7 +251,7 @@
                 </aside>
             </transition>
         </header>
-        <main class="mx-auto w-full max-w-[1280px] mt-16">
+        <main class="md:mx-auto w-full md:max-w-[1280px] mt-4 md:mt-16">
             <slot/>
         </main>
         <footer class="w-full mt-auto bg-primary-500 px-6 py-3">
diff --git a/frontend/pages/scan.vue b/frontend/pages/scan.vue
new file mode 100644
index 0000000..97ba730
--- /dev/null
+++ b/frontend/pages/scan.vue
@@ -0,0 +1,229 @@
+<template>
+    <div class="flex flex-col gap-4 px-4">
+        <h1 class="text-2xl text-primary-500 font-bold uppercase">Scanner des bovins</h1>
+
+        <!-- Message si non supporté -->
+        <div v-if="!scanner.isSupported.value" class="bg-red-50 border border-red-200 rounded p-4 text-red-700 flex flex-col w-full">
+            <p class="font-bold">Scanner non disponible</p>
+            <p class="text-sm mt-1">BarcodeDetector n'est pas supportée par ce navigateur. Utilisez Chrome sur Android.</p>
+        </div>
+
+        <!-- Erreur caméra -->
+        <div v-if="scanner.error.value" class="bg-red-50 border border-red-200 rounded p-4 text-red-700">
+            <p>{{ scanner.error.value }}</p>
+        </div>
+
+        <div class="flex flex-wrap gap-4">
+            <UiSelect
+                id="scan-building"
+                v-model="selectedBuildingId"
+                label="Bâtiment"
+                :options="buildingOptions"
+                wrapper-class="w-full max-w-[280px]"
+                required
+            />
+
+            <UiSelect
+                id="scan-case"
+                v-model="selectedCaseId"
+                label="Case"
+                :options="caseOptions"
+                :disabled="!selectedBuildingId"
+                wrapper-class="w-full max-w-[280px]"
+                required
+            />
+        </div>
+
+        <!-- Zone caméra pleine hauteur -->
+        <div v-if="showScanner" class="fixed inset-0 z-50 flex flex-col bg-black overflow-hidden">
+            <!-- Header scanner -->
+            <div class="flex items-center justify-between px-4 py-3 bg-black/90">
+                <div class="text-white text-sm font-semibold">
+                    {{ scannedCount }} bovin{{ scannedCount > 1 ? 's' : '' }} scanné{{ scannedCount > 1 ? 's' : '' }}
+                </div>
+                <UiButton
+                    type="button"
+                    class="text-md font-bold uppercase bg-red-500 text-white h-[40px] px-4"
+                    @click="stopScanning"
+                >
+                    Arrêter
+                </UiButton>
+            </div>
+            <div class="flex-1 relative">
+                <video
+                    ref="videoRef"
+                    class="w-full h-full object-cover"
+                    playsinline
+                    muted
+                />
+                <!-- Overlay zone de scan -->
+                <div class="absolute inset-0 flex items-center justify-center pointer-events-none">
+                    <div class="w-[90%] h-48 border-2 border-white/70 rounded-lg" />
+                </div>
+                <!-- Dernier scan -->
+                <div v-if="lastScanned" class="absolute bottom-4 left-1/2 -translate-x-1/2 bg-green-600/80 text-white px-4 py-2 rounded-full text-sm font-semibold">
+                    {{ lastScanned }}
+                </div>
+            </div>
+        </div>
+
+        <!-- Bouton démarrer -->
+        <div v-if="!showScanner" class="flex gap-3">
+            <UiButton
+                type="button"
+                class="text-md font-bold uppercase bg-primary-500 text-white h-[50px] w-full max-w-[272px]"
+                :disabled="!scanner.isSupported.value"
+                @click="startScanning"
+            >
+                Démarrer le scanner
+            </UiButton>
+        </div>
+
+        <!-- Liste des numéros scannés -->
+        <div class="flex flex-col gap-3">
+            <p class="text-sm text-slate-500 font-semibold">
+                {{ scannedCount }} bovin{{ scannedCount > 1 ? 's' : '' }} scanné{{ scannedCount > 1 ? 's' : '' }}
+            </p>
+
+            <div
+                v-for="(entry, index) in entries"
+                :key="index"
+                class="flex items-center gap-2"
+            >
+                <UiTextInput
+                    :id="`scan-entry-${index}`"
+                    :ref="(el: any) => setInputRef(el?.$el?.querySelector('input') ?? el, index)"
+                    :model-value="entries[index]"
+                    placeholder="Numéro national"
+                    wrapper-class="flex-1 max-w-md"
+                    @update:model-value="(val: string) => entries[index] = val ?? ''"
+                />
+                <button
+                    v-if="entries.length > 1"
+                    type="button"
+                    class="text-red-400 hover:text-red-600"
+                    @click="removeEntry(index)"
+                >
+                    <Icon name="mdi:close-circle" size="24" />
+                </button>
+            </div>
+        </div>
+
+        <!-- Actions -->
+        <div class="flex gap-3 mt-4">
+            <UiButton
+                type="button"
+                class="text-md font-bold uppercase bg-primary-500 text-white h-[50px] w-full"
+                :disabled="scannedCount === 0 || isSubmitting || !selectedCaseId"
+                :loading="isSubmitting"
+                @click="submit"
+            >
+                Valider ({{ scannedCount }})
+            </UiButton>
+        </div>
+    </div>
+</template>
+
+<script setup lang="ts">
+import { ref, computed, nextTick, onMounted, watch } from 'vue'
+import { useBarcodeScanner } from '~/composables/useBarcodeScanner'
+import { createBovine } from '~/services/bovine'
+import { getBuildingList } from '~/services/building'
+import type { BuildingData } from '~/services/dto/building-data'
+
+const videoRef = ref<HTMLVideoElement>()
+const entries = ref<string[]>([''])
+const inputRefs = ref<(HTMLInputElement | null)[]>([])
+const isSubmitting = ref(false)
+const lastScanned = ref('')
+const showScanner = ref(false)
+
+const buildings = ref<BuildingData[]>([])
+const selectedBuildingId = ref<string | number | null>(null)
+const selectedCaseId = ref<string | number | null>(null)
+
+const buildingOptions = computed(() =>
+    buildings.value.map(b => ({ value: b.id, label: b.label }))
+)
+
+const caseOptions = computed(() => {
+    const building = buildings.value.find(b => b.id === Number(selectedBuildingId.value))
+    if (!building?.buildingCases) return []
+    return [...building.buildingCases]
+        .sort((a, b) => (a.caseNumber ?? 0) - (b.caseNumber ?? 0))
+        .map(c => ({
+            value: c.id,
+            label: `Case ${c.caseNumber ?? c.code ?? c.id}`
+        }))
+})
+
+watch(selectedBuildingId, () => {
+    selectedCaseId.value = null
+})
+
+onMounted(async () => {
+    buildings.value = await getBuildingList()
+})
+
+const scannedCount = computed(() => entries.value.filter(e => e.trim() !== '').length)
+
+function setInputRef(el: HTMLInputElement | null, index: number) {
+    inputRefs.value[index] = el
+}
+
+const scanner = useBarcodeScanner((code: string) => {
+    if (entries.value.some(e => e.trim() === code)) return
+
+    const emptyIndex = entries.value.findIndex(e => e.trim() === '')
+    if (emptyIndex !== -1) {
+        entries.value[emptyIndex] = code
+    } else {
+        entries.value.push(code)
+    }
+
+    lastScanned.value = code
+    entries.value.push('')
+})
+
+function startScanning() {
+    showScanner.value = true
+    nextTick(() => {
+        if (videoRef.value) {
+            scanner.start(videoRef.value)
+        }
+    })
+}
+
+function stopScanning() {
+    scanner.stop()
+    showScanner.value = false
+    lastScanned.value = ''
+}
+
+function removeEntry(index: number) {
+    entries.value.splice(index, 1)
+    inputRefs.value.splice(index, 1)
+}
+
+async function submit() {
+    const numbers = entries.value.filter(e => e.trim() !== '').map(e => e.trim())
+    if (numbers.length === 0 || !selectedCaseId.value) return
+
+    const caseIri = `/api/building_cases/${selectedCaseId.value}`
+    isSubmitting.value = true
+
+    try {
+        let successCount = 0
+        for (const nationalNumber of numbers) {
+            const result = await createBovine({ nationalNumber, buildingCase: caseIri })
+            if (result) successCount++
+        }
+
+        if (successCount > 0) {
+            clearAll()
+        }
+    } finally {
+        isSubmitting.value = false
+    }
+}
+</script>
diff --git a/frontend/services/bovine.ts b/frontend/services/bovine.ts
new file mode 100644
index 0000000..1524991
--- /dev/null
+++ b/frontend/services/bovine.ts
@@ -0,0 +1,29 @@
+import { useApi } from '~/composables/useApi'
+import type { BovineData, BovinePayload } from '~/services/dto/bovine-data'
+
+export async function createBovine(payload: BovinePayload) {
+    const api = useApi()
+    return api.post<BovineData>('bovines', payload, {
+        headers: { 'Content-Type': 'application/ld+json' },
+        toastErrorKey: 'errors.bovine.create',
+        toastSuccessKey: 'success.bovine.create'
+    })
+}
+
+export async function createBovines(nationalNumbers: string[]): Promise<{ created: BovineData[]; errors: string[] }> {
+    const created: BovineData[] = []
+    const errors: string[] = []
+
+    for (const nationalNumber of nationalNumbers) {
+        try {
+            const bovine = await createBovine({ nationalNumber })
+            if (bovine) {
+                created.push(bovine)
+            }
+        } catch {
+            errors.push(nationalNumber)
+        }
+    }
+
+    return { created, errors }
+}
diff --git a/frontend/services/dto/bovine-data.ts b/frontend/services/dto/bovine-data.ts
new file mode 100644
index 0000000..ddc736f
--- /dev/null
+++ b/frontend/services/dto/bovine-data.ts
@@ -0,0 +1,14 @@
+export interface BovineData {
+    id: number
+    nationalNumber: string
+    receivedWeight: number | null
+    arrivalDate: string | null
+    buildingCase: string | null
+}
+
+export type BovinePayload = {
+    nationalNumber?: string
+    receivedWeight?: number | null
+    arrivalDate?: string | null
+    buildingCase?: string | null
+}
diff --git a/frontend/services/dto/building-data.ts b/frontend/services/dto/building-data.ts
index 60729d4..3f5a9d4 100644
--- a/frontend/services/dto/building-data.ts
+++ b/frontend/services/dto/building-data.ts
@@ -1,8 +1,10 @@
 import type { BuildingLayoutData } from '~/services/dto/building-layout-data'
+import type { BuildingCaseData } from '~/services/dto/building-case-data'
 
 export interface BuildingData {
     id: number
     label: string
     code: string
     layouts?: BuildingLayoutData[] | null
+    buildingCases?: BuildingCaseData[] | null
 }
diff --git a/src/Entity/Building.php b/src/Entity/Building.php
index af68257..d1d37eb 100644
--- a/src/Entity/Building.php
+++ b/src/Entity/Building.php
@@ -53,6 +53,8 @@ class Building
      * @var Collection<int, BuildingCase>
      */
     #[ORM\OneToMany(targetEntity: BuildingCase::class, mappedBy: 'id_building')]
+    #[Groups(['building:read'])]
+    #[SerializedName('buildingCases')]
     private Collection $buildingCases;
 
     /**
diff --git a/src/Entity/BuildingCase.php b/src/Entity/BuildingCase.php
index a3f2dd8..0dd4f85 100644
--- a/src/Entity/BuildingCase.php
+++ b/src/Entity/BuildingCase.php
@@ -17,6 +17,10 @@ use Symfony\Component\Serializer\Attribute\SerializedName;
 #[ORM\Entity]
 #[ApiResource(
     operations: [
+        new Get(
+            requirements: ['id' => '\d+'],
+            normalizationContext: ['groups' => ['building:read']],
+        ),
         new Get(
             uriTemplate: '/building_cases/{id}/weights-report',
             requirements: ['id' => '\d+'],