How many heifers to carry through the system

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Reference no: EM13153450

Question.

A farmer has 200-cow self-replacing herd. The normal calving percentage is 80 per cent. The mortality rate is 5 per cent on all animals. Male calves are sold as weaners. Twenty (20) cull cows are sold each year. The farmer wants you to work out how many heifers to carry through the system so that he can replace the cull cows.

Category of livestock

Start of year

purchases

Transfer in

 

births

Total sources

 

No.

No.

No.

from

No.

No.

Cows

 

 

 

 

 

 

Repl. Heifers

 

 

 

 

 

 

Weaner heifers

 

 

 

 

 

 

Weaner steers

 

 

 

 

 

 

calves

 

 

 

 

 

 

total

 

 

 

 

 

 

 

Category of livestock

deaths

Transfers out

 

sales

End of year

Total uses

 

No.

No.

To

No.

No

No

Cows

 

 

 

 

 

 

Repl. Heifers

 

 

 

 

 

 

Weaner heifers

 

 

 

 

 

 

Weaner steer

 

 

 

 

 

 

Calves

 

 

 

 

 

 

total

 

 

 

 

 

 

 

Reference no: EM13153450

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