Exercise

• In general, while calculating the nutrient requirements of dairy cattle and buffaloes for maintenance and milk production the following standards are followed

 Maintenance (g/per kg W0.75) Milk production(g/litre fat corrected milk) TDN 34 330 DCP 2.84 55

Calculate the nutrient requirements for a cow weighing 400 kg and yielding 10 kg. of milk with 5 % fat

Calculation of dry matter requirement:

• Dry matter requirement for a crossbred heavy yielder is 2.5 to 3.0 % of its body weight.
• For an animal weighing 400 kg.

400 x 2.5                                                         400 x 3
Dry matter requirement =      ------------------   = 10 kgs               or        -----------------  = 12 kgs
100                                                                  100

The dry matter requirement = 10 to 12 kgs.

Partitioning of dry matter

1/3 of DM from concentrate.
10 X 1/3 = 3.3 kg. } 3 to 4 kg Dry matter from concentrate.
12 X 1/3 = 4.0 kg }

7 to 8 kg. from Roughage. --- 1/3 from green roughage = 2 to 3 kg.
2/3 from dry roughage = 4 to 5 kg.

TDN requirement

 For maintenance = 34 g X 89.44 = 3040 g. For milk production = 330 g TDN / Kg. FCM (Fat corrected milk) FCM = 0.4 + 0.15 F 0.4 + (0.15 X 5) = 1.15 1 kg of milk with 5% fat = 1.15 kg. of milk with 4 % fat. For 10kg. = 11.5 kg (FCM) Therefore 11.5 kg X 330g = 3795 g. Total TDN required For Maintenance = 3040 g For Lactation = 3795 g Total = 6835 g

DCP requirement

 For maintenance = 2.84 g X 89.44 = 254 g. For milk production = Percentage of protein = 1.9 + 0.4 F = 1.9 + (0.4 x 5) = 3.9 DCP required 6.0 g/100g. 60 g for one kg. milk. = 600 g DCP/10kg Milk. Total DCP required Maintenance = 254 g Lactation = 600 g Total = 854 g

Computation of ration

Requirement : DM = 10-12 kg ; DCP = 854 g ; TDN = 6835 g

 Ingredients Quantity as fed Quantity on DM basis DCP TDN Groundnut Cake 1.1kg 1kg 460g 790g Cotton seed 2.2kg 2kg 250g 1780g Tapioca Thippi 1.1kg 1kg 15g 830g Bengal gram husk 1.1kg 1kg - 600g Green grass 10 kg 2.5kg 100g 1500g Paddy straw 3.3 kg 3.0kg - 1350g 10.5kg 825g 6850g

• To the concentrate part add 2 % mineral mixture and 1 % Sodium chloride.
• If grass is not included in the ration Vitamin A (10,000 IU) should be supplemented. 1mg of carotene = 400 IU of Vitamin A.

Exercise

1. Calculate the nutrient requirements of a cow weighing 350 kg yielding 20 kg of milk per day  with 4 % butter fat?
2. Calculate the nutrient requirements of a buffalo weighing 500 kg yielding 15 kg of milk per day with 7 % butter fat?
3. Find out the nutrient requirements of a cow weighing 400 kg and in advanced stage of pregnancy?
4. Find out the nutrient requirements of a growing buffalo calf weighing 100 kg and growing @ 550 g / day?
5. Find out the nutrient requirements for a pair of bullocks each weighing about 600 kg and ploughing for 6 hr a day?