Page 187 - Calculating Agriculture Cover 20191124 STUDENT - A

CH 15] Calculating Agriculture 15-15

(d) kilos in storage = Wt # x metric factor
= 364,424.44 # x 0.45 kg / #
kilos in storage = 163,991.00 kg

(e) tonnes in storage = kilos ÷ 1,000 kg/tonne
= 163,991.00 kg ÷ 1,000 kg/tonne
= 163.99 tonnes

Refer to page 13-2
Production. In the United States, dairy farmers are paid per 100 pounds of milk; 1 cwt = 100
lb. Dairy cows are milked two or three times a day. In dairies where the cows are milked 3 times
per day the total daily milk production per cow is higher than should they be milked twice a day.
Milk yield will rise during the first months after calving, followed by a long period of continuous
decline. Lactation is ideally 305 days followed by a two-month dry period prior to the next calving.
As this chapter deals with the metric system of calculations you will explore dairy production in
those metric terms by weight and volume.

Example A: The Holstein dairy breed produces on average 9,900 kilograms of milk annually with
an average butterfat content of 3.7%. (a) What is the daily average milk produced
during a 305 day lactation and (b) how many kilograms of butterfat are produced
daily?
Solution:
Annual Milk production
(a) Average daily production = —————————–—
Days of lactation
9,900 kilograms
Average daily production = ——————
305 days

(a) Average daily production = 32.46 kilograms / day

(b) Kilograms of butterfat/day = Kilograms of milk/day x percent butterfat

= 32.46 kg/day x 3.7%

= 32.46 kg/day x 0.037

(b) Kilograms of butterfat/day = 1.20 kilograms daily

Example B: A Holstein dairy herd produces on average 1,620,000 kilograms of milk annually with 15
an average butterfat content of 3.68%. (a) What is the daily average milk produced
during a 305 day lactation and (b) how many kilograms of butterfat are produced
annually? (c) How many tonnes of butterfat are produced annually?
Solution:
Annual Milk production
(a) Average annual production = —————————
Days of lactation

1,620,000 kilograms
Average annual production = ———————
305 days

(a) Average annual production = 5,311.48 kilograms / day

(b) Kilograms of butterfat/yr = Kilograms of milk/yr x percent butterfat

= 1,620,000 kg/yr x 3.68%
= 1,620,000 kg/yr x 0.0368
(b) Kilograms of butterfat/yr = 59,616 kilograms annually

(c) Tonnes of Butterfat/yr = kilograms / yr ÷ 1,000 kg/tonne
= 59,616 kg / yr ÷ 1,000 kg/tonne
(c) Tonnes of Butterfat/yr = 59.62 t / yr

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