Theory question 105
Animal NutritionA farmer fed some lambs with eight different feed compositions. Assuming the Feed Conversion Ratio (FCR) = Feed intake (g) ÷ Weight gain (g)
(a) Complete the table below.
(b) Deduce from the table the feed with the; (i) highest feed conversion ratio; (ii) lowest feed conversion ratio;
(c) Name five products that could be obtained from farm animals.
(d) List three chemical processes involved in rock weathering.
Show the model answer
(a)(i) A: 252 ÷ 42 = 6.0. (ii) B: 500 ÷ 100 = 5.0. (iii) C: intake = 36 × 6.2 = 223.2 g. (iv) D: gain = 840 ÷ 16.4 = 51.2 g. (v) E: gain = 526 ÷ 20 = 26.3 g. (vi) F: intake = 124 × 5.8 = 719.2 g. (vii) G: gain = 1276 ÷ 22 = 58 g. (viii) H: 1026 ÷ 45.2 = 22.7.
(b)(i) Highest FCR: feed H (22.7). (ii) Lowest FCR: feed B (5.0).
(c) Any five: meat; milk; eggs; wool; hides and skins; manure; bones/bone meal; horns and hooves; feathers; blood meal; honey.
(d) Any three: hydrolysis; hydration; oxidation; carbonation; solution; reduction.
Rearrange FCR = intake ÷ gain to find the missing intake or gain.