Lab 3012
Biology of Growth and Development
Tracey Hoffman
Chapter 2 of Animal Science Biology & Technology
10 minutes:
Lab briefing
30 minutes:
Laboratory activity: pg. 33 of text
Purpose:
Materials:
Procedure:
Days of Age
15
30
45
60
75
90
105
120
135
150
165
180
195
210
225
240
255
270
To plot growth curves from two different animals and analyze their
growth patterns.
graph paper, pencil, ruler
1. Plot the following data for two wether lambs, “Sam” and
“Buck” on graph paper. Label the horizontal axis “Days of Age”
and the vertical axis “Weight in Pounds”
Weight in Pounds
Sam
Buck
8
8
10
9
12
11
15
13
24
19
28
23
31
25
35
27
43
36
52
45
61
51
70
59
75
65
80
71
92
74
100
80
102
81
104
82
Procedure:
2. Connect the dots for each lamb to form a growth curve.
3. Identify the points where growth accelerates
4. Identify the growth line.
Analysis:
1. Which lamb appeared to mature at the heavier weight?
2. Was there a difference in the time it took the lambs to reach
maturity?
3. Was there any difference in the growth rate of the lambs?
4. Which lamb would you expect to be fatter upon reaching 80
pounds?