waecE-LEARNING
Agricultural Science Paper 3, Nov/Dec 2012  
Questions: 1 2 3 4   Main
General Comments
Weakness/Remedies
Strength













































Question 4

(Question 4

    • Calculate the feed efficiencies for the 10 weeks and complete the table.      [10 marks]
    • In which week were the layers most efficient in converting feed to eggs?    [ 1 mark ]
    • In which week were the layers least efficient in converting feed to eggs?    [ 1 mark ]
    • Calculate the overall average feed efficiency for the 10 weeks.                    [ 1 mark ]
    • What would be the effect on feed efficiency, if palm kernel cake in diet                               of layers was replaced with fish meal?                                                         [ 1 mark ]

     

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OBSERVATION

This question was poorly attempted by the candidates. Most of the candidates could not calculate the feed efficiencies for the 10 weeks to complete the table as required in 4(a).  Majority of the candidates could neither state which week the layers were most efficient nor the week the layers were least efficient in converting feed to eggs as required in 4(b-c).  Most of them also, could not calculate the overall average feed efficiency for the 10 weeks as required in 4(d) but majority of them could state what would be the effect on feed efficiency if palm kernel cake was replacedwith fish meal in the diet of the layers as required in 4(e).
The expected answers include:
4.(a)Calculation on feed efficiency for 10 weeks and completion of table


Week

Total Eggs Laid

Total Feed Consumed (kg)

Feed Efficiency

1

80

10.0

1.250

2

100

12.0

1.200

3

120

15.5

1.292

4

140

16.9

1.207

5

160

18.0

1.125

6

180

18.5

1.028

7

195

19.8

1.015

8

220

20.0

0.909

9

235

22.3

0.949

10

245

23.0

0.939

Week 1   -        10.0    =          0.125 x 10 eggs
                                           80                   (1.25)

Week 2   -       12.0     =          0.120 x 10 eggs
                                          100                  (1.20)
     
Week 3   -       15.5     =          0.129 x 10 eggs
                                          120                  (1.29)

Week 4   -       16.9     =          0.121 x 10 eggs
                  140                  (1.21)

Week 5   -       18.0     =          0.1125 x 10 eggs
                                          160                  (1.13)

Week 6   -       18.5     =          0.103 x 10eggs
                                          180                  1.03

Week  7  -       19.8     =          0.102x 10 eggs
                                          195                  (1.02)

Week  8   -      20.0     =          0.091x 10 eggs
                                          220                  (0.91)

Week  9   -      22.3     =          0.095x 10 eggs
                                          235                  (0.95)

Week  10  -     23.0     =          0.094x 10 eggs
                                          245                  (0.94)

(b)  Most efficient week is week 8.                                              
(c)  Least efficient week is week 3.                                             
(d)  Overall feed efficiency is
      Total Feed         = 176 kg.
      Total Eggs       = 167.5           
Feed Efficiency = 176
167.5      =   1.051

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