1
AGRICULTURAL SCIENCES
Grade 12
Practical Investigation: MEMO
Topic: Animal Nutrition
Cognitive Levels:
1, 2, 3 and 4
SECTION
Number
Identify
Proteins /
Carbohydrates/
Minerals
Concentrate /
roughage/
supplement
1
Bone meal
Minerals √
Supplement √
2
Maize meal
Carbohydrates
√
Concentrate √
3
Oat grain
Carbohydrates
√
Concentrate
√
4
Poultry manure
Protein
Concentrate
√
5
Lucerne hay
√
Protein √
Roughage √
Use
Ca + P supplement in a lick
√
Fattening / Energy source √
Fattening /Energy source
√
Production and growth √
Production and growth √
(20)
SECTION B
Questions:
1.
DM of feed: 20 – (10/100 X 20) = 18kg √
DM of Manure: 16 – (50/100 X 16) = 8 kg √
Coefficient of digestibility:
Dry material intake (kg) – Dry material of manure (kg) X 100 √
Dry material intake (kg)
= 18kg – 8kg X 100 √
18kg √
= 50% √
Oat hay √: (Reason) 10% moisture content + TDN is very close to 50% √
(8)
2
Feed 2: Maize meal 9% √
2.
10 parts Maize meal √√
18% √
Feed 4: Poultry Manure 28% √
9 parts Poultry Manure √√
(7)
Lucerne hay 89% DM √; 58% TDN √; 17% CP √; 30% CF √; 1,4% Ca √
3.
Roughage – high crude fibre content √
Rich in protein – high Crude protein value √
4.
(Any 5)
Identification of the feeds:
4.1
Urea √
4.2
Luserne hay √
4.3
Bone meal √
4.4
Wheat straw √
4.5
Poultry manure √
5.
Danger: Urea poisioning √√ and




(5)
(2)
Urea is very soluble √
Ruminants has a limit to the quatity of urea they can take in √
When urea in a feed is transported it should be protected from rain √
Feed conytaining urea in a feeding cript should be protected against rain √
(Any 3)
[50]