"So I am assuming that this is what VickieB is doing. She is using a crossbred doe to produce these offspring that are doing so well on quick development. If this is true run thru how you got where you are VickieB. What other breed did you use to achieve the 1/2 Altex doe and what did you breed her to to get where your at?"
P.O., I went on to re-read what you had written about the Altex and saw this question. Queen is 1/2 Altex, and half NZW. I bred Queen twice last spring, before the summer break. Those were her first kindles. I bred her to a Production White. He really looks more like a NZW than the Altex, which is common with the PW. He is a little smaller than she is. Because he's PW he does have the Altex in his background though. Her first litters had 11 and 10 respectively, and the kits were small. They didn't start reaching that 5 pound mark until the 12th week. (I'm beginning to think that the small size was either due to the heat, or the fact that these were her first litters, or a combination of both) I bred her for the 3rd time with the same PW buck in September. She kindled only 4 kits in October, 3 does and 1 buck. They had the markings of an Altex, and they were much larger, even at birth. She has had kits with those markings before but their markings weren't nearly as dark as these. They weighed 1 pound at 3 weeks, but by 8 weeks they were all over 5 pounds, the does being 5 1/2 pounds. When those babies were 4 weeks I bred her again to the same buck. She had 9 babies that time. All of those babies reached 5 pounds by 8 1/2 weeks.
I got my Altex buck in the fall, and bred him to Queen on the next breeding. She kindled last week. She had 12 babies, but has lost 4. They're only ten days old, and I don't start weighing them until 3 weeks. I hate messing with them when they're so young, so I won't know how they are comparing yet, and won't for another couple of weeks. I also plan on breeding the Altex with the younger does next month.
I hope this answered those questions. I'll let you know how it all turns out.