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 Agricultural Science Paper 2, Nov/Dec 2008
 Questions: 1 2 3 4 5 6 7 8 9 10 Main
Weakness/Remedies
Strength

Question 8

(a)        Define the term diet as used in animal nutrition.                            (1 mark)
(b)        State four factors to consider in formulating diet for a farm animal.           (4 marks)
(c )       The table below shows the performance of four farm animals raised
for 180 days on four formulated diets.

 Formulated diets Parameters I II III IV Initial liveweight (kg) 40 41 38 42 Final liveweight (kg) 70 79 88 76 Total feed intake (kg) 576 738 450 558

(i)        Estimate the weight gain per day on each diet;                                    (5 marks)
(ii)       Calculate the feed intake per day for each diet;                                   (3 marks)
(iii)      What percentage of the animal's body weight did each animal consume
per day?                                                                                                 (3 marks)

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OBSERVATION

However, in 8(c) (i-iii), majority of the candidates could not solve the calculation on the formulated diet as presented in the table above.

The expected answers include:

Weight gain per day

1. Weight gain =  Final  -  Initial
2. Diet I     =  70 – 40  =  30kg
3. Diet       II    =   79 – 41  =  38kg
4. Diet      III   =   88 – 38  =  50kg
5. Diet       IV   =  76 –  42  =  34kg

Weight gain per day
1000g             =  1 kg   =  Weight gain   x  1000g
(180 days)

Diet I    =       30 kg x 1000
180                     =     166.67g

Diet II    =       38 kg x 1000
180                  =      211.11g

Diet III    =          50 kg  x  1000
180                  =       277.78g

Diet IV    =       34 kg  x  1000
180                  =       188.89g

Feed intake per day    =    Total feed intake
180 days

Diet I                =          576 kg             =         3.2 kg
180

Diet II              =          738 kg             =          4.1 kg
180

Diet III             =          450 kg
180                =          2.5 kg

Diet IV =          558 kg
180                  =          3.1 kg

# Percentage of the body weight

=   Feed intake per day  x  100
Final live weight
Diet  I               =          3.20     x    100
70                               =   2.24%

Diet  II             =          4.1       x     100
79                                =    3.24%

Diet   III           =          2.5       x      100
88                                =     2.20%

Diet  IV            =          3.1      x        100
76                                =      2.36%