diff --git a/Md03_Dev_Back_end/Bloco28/28.1/connection.ts b/Md03_Dev_Back_end/Bloco28/28.1/connection.ts
new file mode 100644
index 00000000..98f3a67f
--- /dev/null
+++ b/Md03_Dev_Back_end/Bloco28/28.1/connection.ts
@@ -0,0 +1,9 @@
+import { connect } from 'mongoose';
+
+const options = {
+  user: 'user',
+  pass: 'password',
+  dbName: 'trixDB',
+}
+
+connect('mongodb://localhost:27017', options);
\ No newline at end of file
diff --git a/Md03_Dev_Back_end/Bloco28/28.1/conteudo001.ts b/Md03_Dev_Back_end/Bloco28/28.1/conteudo001.ts
new file mode 100644
index 00000000..4b356d48
--- /dev/null
+++ b/Md03_Dev_Back_end/Bloco28/28.1/conteudo001.ts
@@ -0,0 +1,19 @@
+import { Schema, model } from 'mongoose';
+
+interface IPet {
+  name: string,
+  species: string,
+  age?: number,
+  weight: number,
+  dailyMealsNumber:number,
+}
+
+const petSchema = new Schema<IPet>({
+  name: { type: String, required: true },
+  species: { type: String, required: true },
+  age: { type: Number, required: false },
+  weight: { type: Number, required: true },
+  dailyMealsNumber: { type: Number, required: true, min: 2, max: 5 },
+});
+
+const PetModel = model<IPet>('Pet', petSchema);
\ No newline at end of file
diff --git a/Md03_Dev_Back_end/Bloco28/28.1/conteudo002.ts b/Md03_Dev_Back_end/Bloco28/28.1/conteudo002.ts
new file mode 100644
index 00000000..3e3aceb4
--- /dev/null
+++ b/Md03_Dev_Back_end/Bloco28/28.1/conteudo002.ts
@@ -0,0 +1,6 @@
+interface IPerson {
+  payByPerson: string,
+  payToPerson: string,
+  amount: number,
+  key: number
+}
\ No newline at end of file
diff --git a/Md03_Dev_Back_end/Bloco28/28.1/poo-trix b/Md03_Dev_Back_end/Bloco28/28.1/poo-trix
new file mode 160000
index 00000000..428811c6
--- /dev/null
+++ b/Md03_Dev_Back_end/Bloco28/28.1/poo-trix
@@ -0,0 +1 @@
+Subproject commit 428811c6292721cd501defd0854dd9d8b03e8a29