Page 119 - Calculating Agriculture Cover 20191124 STUDENT - A

CH 11 Calculating Agriculture 11-7

(500 – 65)
Adjusted 205-day wt. = [ ———— x 205] + 65 + 60
169

435
. = [ ——– x 205] + 65 + 60
169

Adjusted 205-day wt. = [ 2.574 x 205] + 65 + 60
Adjusted 205-day wt. = 527.66 + 65 + 60
Adjusted 205-day wt. = 652.66  653 pounds (Rounded up)

Heifer calf or Bull calf adjustment: Calf is a heifer. Add 25 pounds
653 pounds + 25 pounds = 678 Final adjusted weight for calf’s sex 11

Example B. A bull calf born on March 28 from a four-year-old cow and weaned on October 15 weighed
475 pounds. His dam was a four-year-old cow. The calf’s birth weight is not available,
therefore it is presumed for this bull calf’s birth weight is 70 pounds. Calculate of the calf’s
adjusted weight?

Solution:

Bull Calf:
weaning wt. − birth wt. Dams Age
Adjusted 205-day wt. = [ ——————–———— x 205] + birth wt. + Weaning wt
age in days Adjustment

475 - 70
Adjusted 205-day wt. = [ ———— x 205] + 70 + 20
164*
*Age in days = Oct. 15 (288th day of yr. from Table 11.4 above) to March 28 (87nd day of yr.)
365 — 288 + 87 = 164 days

(475 – 70)
Adjusted 205-day wt. = [ ———— x 205] + 70 + 20
164

405
. = [ —— x 205] + 70 + 20
164

Adjusted 205-day wt. = [ 2.4695 x 205] + 70 + 20
Adjusted 205-day wt. = 506.25 + 70 + 20
Adjusted 205-day wt. = 596.25  596 pounds (Rounding)

Heifer calf or Bull calf adjustment: Calf is a bull. Subtract 25 pounds
596 pounds − 25 pounds = 571 pounds Final adjusted weight for calf’s sex

How many bulls are needed for the herd? It is recommended that there be 1 bull for every 25 to 30 cows
on the range for proper coverage. The breeding period is 60 to 70 days and the bulls are generally older than 2
years of age.

Example: Cattle Rancher Danny Juarez has a 300 cow herd, and his good management requires a ratio of 1
bull for every 30 cows for breeding. If the ratio of 1:30 is used for bulls to cows in breeding then
how many breeding bulls are required to service a 300 cow herd?

Solution: # cows in herd ÷ cows/bull = # of breeding bulls

300 cows ÷ 30 cows/bull = # of breeding bulls

10 = # of breeding bulls

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