|Graph of rabbit growth rates.|
Green line - crossbred average
Green field - crossbred range
Purple line - Rex average
Purple field - Rex range
Red line - Californian weights
Blue line - New Zealand average
3-week weights ranged from 9.8 oz. to 21 oz. (1 lb. 5 oz), averaging 13.2 oz. 8-week weights ranged from 43 oz. (2 lbs. 11 oz.) to 70 oz. (4 lbs. 6 oz.), averaging 54.1 oz (3 lbs. 6.1 oz.).
I'll admit that these are not ideal weights (the ideal goal would be 5 lbs by 8 weeks), but they still produce sizable-enough fryers to butcher at 10 to 12 weeks old, especially since at the 8- to 10-week-old range, fryers typically put on about 1/2 a pound a week (which would put the 10-week average at almost 4-1/2 pounds, and the 12-week average at nearly 5-1/2 lbs). With that gain, they are right on target for the typical backyard breeder's goal of 5 lbs between 10 and 12 weeks old.
The big point of interest that I'd like to point out is how the litter weights cross around the 7-week mark. I didn't post a graph of the individual litter weights, but there are also crossovers between several litters at 4 and 6 weeks, as well. That goes to show that weights before 7 weeks are not reliably indicative of weights at 8 weeks or more.
Comparing litter sizes:
|Litter size (number of litters)|
|2 (2)||3||5||6 (2)||7 (3)||8 (4)||9 (2)|
I also thought you might want to look at the data which shows how parents' weights affect the weight of the litters:
I promise I will collect more data from upcoming litters, and probably make a new post showing weights through 10 or 12 weeks old. I may also put together a chart showing the breakdown by litter size.