diff --git a/Cow.java b/Cow.java
index 2737e4f..db55ca3 100755
--- a/Cow.java
+++ b/Cow.java
@@ -150,6 +150,7 @@
 
 	private int combineTrait(int fathertrait, int mothertrait)
 	{
+		//FIXME This should have a higher variance
 		int newtrait = (int) Math.round((fathertrait+mothertrait)/2);
 		int quartertrait = (int) Math.round(newtrait*0.25);
 		int randomfactor = Herd.randomInt(quartertrait*2) - quartertrait;

diff --git a/Cow.java b/Cow.java
index 2737e4f..db55ca3 100755
--- a/Cow.java
+++ b/Cow.java
@@ -150,6 +150,7 @@
 
 	private int combineTrait(int fathertrait, int mothertrait)
 	{
+		//FIXME This should have a higher variance
 		int newtrait = (int) Math.round((fathertrait+mothertrait)/2);
 		int quartertrait = (int) Math.round(newtrait*0.25);
 		int randomfactor = Herd.randomInt(quartertrait*2) - quartertrait;
diff --git a/Herd.java b/Herd.java
index 4fdb867..7234325 100755
--- a/Herd.java
+++ b/Herd.java
@@ -46,6 +46,7 @@
 	public static int randomInt(int max)
 	{
 		if (random == null) random = new Random();
+		if (max <= 0) max = 1;
 		return random.nextInt(max);
 	}
 
@@ -119,7 +120,8 @@
 			return "The age difference between the parents is too great!";
 		//check for siblings
 		if (parents[0].getParents()[0] == parents[1].getParents()[0] &&
-			parents[0].getParents()[1] == parents[1].getParents()[1])
+			parents[0].getParents()[1] == parents[1].getParents()[1] &&
+			!(parents[0].getParents()[0] == 0 || parents[0].getParents()[1] == 0))
 			return "You cannot let siblings mate!";
 		return "OK";
 	}

diff --git a/Cow.java b/Cow.java
index 2737e4f..db55ca3 100755
--- a/Cow.java
+++ b/Cow.java
@@ -150,6 +150,7 @@
 
 	private int combineTrait(int fathertrait, int mothertrait)
 	{
+		//FIXME This should have a higher variance
 		int newtrait = (int) Math.round((fathertrait+mothertrait)/2);
 		int quartertrait = (int) Math.round(newtrait*0.25);
 		int randomfactor = Herd.randomInt(quartertrait*2) - quartertrait;
diff --git a/Herd.java b/Herd.java
index 4fdb867..7234325 100755
--- a/Herd.java
+++ b/Herd.java
@@ -46,6 +46,7 @@
 	public static int randomInt(int max)
 	{
 		if (random == null) random = new Random();
+		if (max <= 0) max = 1;
 		return random.nextInt(max);
 	}
 
@@ -119,7 +120,8 @@
 			return "The age difference between the parents is too great!";
 		//check for siblings
 		if (parents[0].getParents()[0] == parents[1].getParents()[0] &&
-			parents[0].getParents()[1] == parents[1].getParents()[1])
+			parents[0].getParents()[1] == parents[1].getParents()[1] &&
+			!(parents[0].getParents()[0] == 0 || parents[0].getParents()[1] == 0))
 			return "You cannot let siblings mate!";
 		return "OK";
 	}
diff --git a/MooBreeder.java b/MooBreeder.java
index 3efab35..c823a5f 100755
--- a/MooBreeder.java
+++ b/MooBreeder.java
@@ -31,7 +31,7 @@
 	private JPanel breedPanel;
 	private JScrollPane herdScroller;
 	private Box herdBox, motherBox, fatherBox, calf1Box, calf2Box;
-	private JButton breed;
+	private JButton breedButton;
 	private JFileChooser fileChooser;
 
 	//TODO Insert the "breed" button!
@@ -155,14 +155,15 @@
 									   ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
 		herdScroller.setWheelScrollingEnabled(true);
 		herdBorderPanel.add(herdScroller, BorderLayout.CENTER);
+		//Take care of the layout
 		herdBorderPanel.add(Box.createVerticalStrut(25), BorderLayout.NORTH);
 		herdBorderPanel.add(Box.createVerticalStrut(25), BorderLayout.SOUTH);
 		herdBorderPanel.add(Box.createHorizontalStrut(25), BorderLayout.EAST);
 		herdBorderPanel.add(Box.createHorizontalStrut(25), BorderLayout.WEST);
 		this.add(herdBorderPanel);
 		//Create the right half of the window with the breeding interface
-		//TODO - breed button
 		JPanel breedBorderPanel = new JPanel(new BorderLayout());
+		Box breedBox = new Box(BoxLayout.Y_AXIS);
 		breedPanel = new JPanel(new GridLayout(2,2));
 		fatherBox = new Box(BoxLayout.Y_AXIS);
 		motherBox = new Box(BoxLayout.Y_AXIS);
@@ -172,11 +173,21 @@
 		breedPanel.add(motherBox);
 		breedPanel.add(calf1Box);
 		breedPanel.add(calf2Box);
-		breedBorderPanel.add(breedPanel, BorderLayout.CENTER);
+		breedBox.add(breedPanel);
+		//Add the breed button
+		breedButton = new JButton("Breed");
+		breedButton.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent e) {
+				breedAction();
+			}
+		});
+		breedBox.add(Box.createVerticalStrut(10));
+		breedBox.add(breedButton);
+		//Take care of the layout
+		breedBorderPanel.add(breedBox, BorderLayout.CENTER);
 		breedBorderPanel.add(Box.createVerticalStrut(25), BorderLayout.NORTH);
-		breedBorderPanel.add(Box.createVerticalStrut(25), BorderLayout.SOUTH);
 		breedBorderPanel.add(Box.createHorizontalStrut(25), BorderLayout.EAST);
-		breedBorderPanel.add(breedPanel);
+		breedBorderPanel.add(Box.createVerticalStrut(25), BorderLayout.SOUTH);
 		this.add(breedBorderPanel);
 		updateGUI();
 	}
@@ -242,12 +253,6 @@
 		calf2Box.validate();
 	}
 
-	private void resetGame()
-	{
-		Herd.getInstance().resetHerd();
-		updateGUI(); //FIXME ScrollPane disappears? - only until window is resized
-	}
-
 	private Box getCowBox(Cow c)
 	{
 		Box cowBox = new Box(BoxLayout.Y_AXIS);
@@ -287,6 +292,25 @@
 		return cowBox;
 	}
 
+	private void breedAction()
+	{
+		String possible = Herd.getInstance().checkBreeding();
+		if (possible == "OK") {
+			Herd.getInstance().breed();
+			updateGUI();
+		}
+		else {
+			JOptionPane.showMessageDialog(null, possible, "Breeding failed",
+										  JOptionPane.WARNING_MESSAGE);
+		}
+	}
+
+	private void resetGame()
+	{
+		Herd.getInstance().resetHerd();
+		updateGUI(); //FIXME ScrollPane disappears? - only until window is resized
+	}
+
 	/*
 	 * MouseListener methods
 	 *