Cobb 500 broiler weight chart (day by day)

Target body weight, feed per bird and FCR for Cobb 500, day 0 to day 56. As-hatched, metric, from the Cobb-Vantress 2022 supplement.

برائلر وزن چارٹ: روزانہ وزن، فیڈ اور FCR

Key targets As-hatched, 2022 breeder table.

Day 7: 202 g FCR 0.891
Day 21: 1,116 g FCR 1.182
Day 35: 2,521 g FCR 1.441
Day 42: 3,278 g FCR 1.555

Cobb 500 growth curve and FCR by age

Target live weight in grams, day 0 to day 56. Squares mark the end of each week.

Cobb 500 · Targets at the end of each week
Day	Weight (g)	Gain that week (g)	Feed that week (g)	Cum. FCR
0	42	—	—	—
7	202	160	180	0.891
14	570	368	408	1.029
21	1,116	546	732	1.182
28	1,783	667	1,039	1.322
35	2,521	738	1,276	1.441
42	3,278	757	1,465	1.555
49	4,001	723	1,649	1.686
56	4,641	640	1,800	1.842

Gain and feed that week are worked out from the breeder table: the change since the end of the week before.

Cobb 500 weight and feed consumption per day

Cobb 500 · Target weight, feed and FCR, days 0 to 28
Day	Weight (g)	Daily gain (g)	Feed that day (g)	Cum. feed (g)	Cum. FCR
Placement
0	42	—	—	—	—
Week 1 · days 1 to 7
1	55	13	—	—	—
2	71	16	—	—	—
3	90	19	—	—	—
4	112	22	—	—	—
5	138	26	—	—	—
6	168	30	—	—	—
7	202	34	—	180	0.891
Week 2 · days 8 to 14
8	240	38	40	220	0.917
9	283	43	44	264	0.933
10	330	47	50	314	0.952
11	382	52	57	371	0.971
12	440	58	64	435	0.991
13	503	63	73	508	1.012
14	570	67	80	588	1.029
Week 3 · days 15 to 21
15	639	69	84	672	1.050
16	711	72	91	763	1.072
17	786	75	98	861	1.094
18	864	78	105	966	1.116
19	945	81	111	1,077	1.138
20	1,029	84	118	1,195	1.160
21	1,116	87	125	1,320	1.182
Week 4 · days 22 to 28
22	1,205	89	131	1,451	1.203
23	1,296	91	137	1,588	1.224
24	1,390	94	143	1,731	1.245
25	1,486	96	149	1,880	1.265
26	1,583	97	154	2,034	1.284
27	1,682	99	160	2,194	1.303
28	1,783	101	165	2,359	1.322

Cobb 500 · Target weight, feed and FCR, days 29 to 56
Day	Weight (g)	Daily gain (g)	Feed that day (g)	Cum. feed (g)	Cum. FCR
Week 5 · days 29 to 35
29	1,886	103	169	2,528	1.340
30	1,989	103	174	2,702	1.358
31	2,094	105	178	2,880	1.375
32	2,200	106	183	3,063	1.392
33	2,306	106	187	3,250	1.409
34	2,413	107	191	3,441	1.425
35	2,521	108	194	3,635	1.441
Week 6 · days 36 to 42
36	2,629	108	198	3,833	1.457
37	2,738	109	202	4,035	1.474
38	2,846	108	206	4,241	1.490
39	2,954	108	209	4,450	1.506
40	3,062	108	213	4,663	1.522
41	3,170	108	217	4,880	1.539
42	3,278	108	220	5,100	1.555
Week 7 · days 43 to 49
43	3,384	106	224	5,324	1.573
44	3,490	106	228	5,552	1.590
45	3,595	105	232	5,784	1.608
46	3,699	104	236	6,020	1.627
47	3,801	102	239	6,259	1.646
48	3,902	101	243	6,502	1.666
49	4,001	99	247	6,749	1.686
Week 8 · days 50 to 56
50	4,099	98	250	6,999	1.707
51	4,195	96	253	7,252	1.728
52	4,289	94	256	7,508	1.750
53	4,380	91	258	7,766	1.772
54	4,470	90	260	8,026	1.795
55	4,557	87	261	8,287	1.818
56	4,641	84	262	8,549	1.842

About this table

Weight, cumulative feed and cumulative FCR are copied from the breeder’s 2022 table, as-hatched and metric.
Daily gain and feed that day are the change from the day before. We worked them out; they are not in the breeder’s table.
Cumulative feed is the total grams one bird has eaten up to that day. Cumulative FCR is the breeder’s own figure. It is close to that feed divided by the bird’s weight on the same day, but not always equal to it.

Source Cobb-Vantress, Cobb500 Broiler Performance & Nutrition Supplement 2022 (as-hatched, metric). cobb-vantress.com

These are breeder targets, not a promise. Real flocks change with weather, feed, health and care.

The page prints without the menus and buttons: the title, the source and both tables. Choose “Save as PDF” in the print window to keep a copy.

How to weigh a sample of birds

The chart only helps if your own figure is fair to the whole shed.

Weigh at the same time of day each time, so the birds’ crops are in the same state.
Catch birds from the front, the middle and the back of the shed, not only the easy ones near the door or the feeders.
Weigh the same number of birds each time, from the same places, so this week’s average can be set beside last week’s.
Write down each weight. Add them up and divide by the number of birds. That is the sample average.
Note the lightest and the heaviest bird too. A wide spread means the flock is growing unevenly.

In Poultry Ledger

Press W on Today’s Log and enter the sample’s average weight, with the lightest and heaviest bird, in grams.

Set the flock’s breed to Cobb 500 and the app shows its weight beside the target for that day. Every sample is kept, so you can see the trend.

How to compare your flock with the chart

Work out the flock’s age in days. The day the chicks were placed is day 0.
Find that day in the table and set your sample average beside the target weight.
Look at the gain over the last week, not only today’s weight. Set it beside the “gain that week” column.
If you know the feed used, work out your FCR with the calculator and compare it with the FCR for the same day.
If the flock is behind, check that the feed bags were really eaten, then look at water, heat, stocking and health.

example farm FLOCK-2026-012 · Cobb 500

Example: one sample, one target

Age: day 31
Sample average: 2,130 g
Cobb 500 target: 2,094 g
Difference: +36 g · +1.7%

Ahead of the target for its age.

Work out your FCR

Cobb 500 vs Ross 308

Cobb 500 Ross 308 Target live weight in grams, day 0 to day 56, both breeds.

Ross 308 is the heavier table up to day 9. From day 11 the Cobb 500 table is heavier every day.
From day 21 to day 35 the Cobb 500 target is about 10% heavier: 2,521 g against 2,296 g at day 35.
The Cobb 500 target FCR is higher on every day that both tables give one: 1.441 against 1.399 at day 35.
These are two breeders’ own targets on their own feeding programmes, not a trial on one farm. Compare your flock with the table for the breed you placed.

Ross 308 and Cobb 500 targets at the end of each week
Day	Ross 308 (g)	Cobb 500 (g)	Cobb − Ross (g)	Cobb − Ross (%)	Ross 308 FCR	Cobb 500 FCR
0	44	42	−2	−4.5%	—	—
7	213	202	−11	−5.2%	0.780	0.891
14	533	570	+37	+6.9%	1.005	1.029
21	1,012	1,116	+104	+10.3%	1.142	1.182
28	1,616	1,783	+167	+10.3%	1.269	1.322
35	2,296	2,521	+225	+9.8%	1.399	1.441
42	2,998	3,278	+280	+9.3%	1.531	1.555
49	3,681	4,001	+320	+8.7%	1.663	1.686
56	4,318	4,641	+323	+7.5%	1.793	1.842

Cobb 500 weight chart questions

What should a Cobb 500 weigh at 35 days?

The 2022 as-hatched target is 2,521 g (2.521 kg) at day 35, with a cumulative FCR of 1.441. At day 42 the target is 3,278 g.

How much feed does a Cobb 500 eat per day?

It rises with age. The table works out to 125 g per bird on day 21 and 194 g on day 35. By day 35 one bird has eaten 3,635 g in total.

Why are feed and FCR blank for the first week?

The Cobb 500 2022 supplement gives no feed or FCR values before day 7. The table shows “—” for those days rather than a guess.

How is the FCR column worked out?

It is the breeder’s cumulative FCR, copied from the table. It is close to cumulative feed per bird divided by body weight on the same day: at day 35, 3,635 ÷ 2,521 ≈ 1.442, and the table gives 1.441. Our FCR calculator takes the chick weight out first, so for the same flock it reads a little higher.

Is this for males, females or a mixed flock?

These are the as-hatched figures: a mixed flock of males and females, as they come from the hatchery.

Can I print this chart or save it as a PDF?

Yes. Use the “Print this table” button or your browser’s print. The page prints the title, the source and both tables without the menus. Choose “Save as PDF” to keep a copy.

Cobb 500 targets at a glance

Day 21: 1,116 g; Target FCR 1.182
Day 35: 2,521 g; Target FCR 1.441
Day 42: 3,278 g; Target FCR 1.555

The breeder’s as-hatched targets: males and females together, as they come from the hatchery.

See every day in the table

Not sure how your flock compares?

Send us your flock’s age and weight on WhatsApp and we will help.

0303-5655167

Put your own flock beside this chart.

Set the flock’s breed to Ross 308 or Cobb 500, record a sample weight, and Poultry Ledger shows the flock against the target for its age. It works offline.

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