Weight to age chart

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cowboy43

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I am in need for an average weight chart to age chart , for angus or brangus heifers.
Example:
4 month old weight. Is
5 month old weight. Is

Go from 4 months all the way to 16 months when she should be bred . If their is such a chart when you buy a heifer at a certain weight the age should be established by knowing the weight. :cboy:
 

HDRider

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cowboy43":24fnz5un said:
I am in need for an average weight chart to age chart , for angus or brangus heifers.
Example:
4 month old weight. Is
5 month old weight. Is

Go from 4 months all the way to 16 months when she should be bred . If their is such a chart when you buy a heifer at a certain weight the age should be established by knowing the weight. :cboy:
I am going to throw this out to see how off I am.

I take weight - 70 / 2.5 e.g. 400# is 132 days old or 4.4 months old

Doing it backward
4 months should weigh about 230# to 250#
5 months should be 300# to 325#
 

Texas PaPaw

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I figure 2 lb per day of age (60 # mo )+ 75 # birth weight.

4 mo would be approx 240 + 75 = 315
5 mo = 300 + 75 = 375

This formula will usually be in the ballpark or possibly on the light side as many calves will gain a little over 2#/day.
 

HDRider

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alisonb":3bwf1tx5 said:
HDRider":3bwf1tx5 said:
Oops. I subtracted when I should of added.
Don't fret, at least you weren't designing a bridge :p
I have been thinking about my bridge..

Let's say a calf weighs 70 pounds at birth. And, it gains 2 pounds a day. And it weighs 100 pounds.. How old is it?

I get 15 days old..

100 - 70 = 30
30 / 2 = 15 days old
 

Nesikep

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A few years ago I regularly weigh taped all my calves every 2 weeks.. Some would grow in spurts, and some had very steady growth.. One heifer in particular was VERY steady, so I plugged it all into Excel and got a formula which I use to compare the weight of all other calves...
Calves tend to put on more weight in the first month than the 5th if the feeding regime is similar, so I came up with this

-0.002 * Age^2 + 3 * Age + BW
Basically is says that they start off gaining 3 lbs a day, and every day they gain .002 lbs less, so that at 200 days they're gaining 2.6 lbs
This yields what I consider about my minimum requirements for a replacement heifer.. 600 lbs @205 days

Here's what it works out to.. week by week with an 80 lb birthweight
7 100.902
14 121.608
21 142.118
28 162.432
35 182.55
42 202.472
49 222.198
56 241.728
63 261.062
70 280.2
77 299.142
84 317.888
91 336.438
98 354.792
105 372.95
112 390.912
119 408.678
126 426.248
133 443.622
140 460.8
147 477.782
154 494.568
161 511.158
168 527.552
175 543.75
182 559.752
189 575.558
196 591.168
203 606.582
210 621.8
217 636.822
 

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