Mill Iron A said:
I'm wondering if half blood daughters of one of these small breeds bred to "average" sized angus cattle with the resulting cross being that elusive 1100 pound cow. Would these females be able to calve a moderate calving ease charolais embryo calf?
I do think you're on the right track as far as wanting to add another (singular) breed to your Red Angus to develop your recips. Despite what the con artist salesman tell you, the maternal heterosis of the f1 female is unmatched. With as much time/money as you will have invested in the ET process, it only makes since to rid any and all inefficiencies you can by taking advantage of this phenomenon.
To touch on what librarian said, which I absolutely agree with, there is no point injecting more growth -via the sire- than what your cows can provide (milk) for. It is a waste to assume more risk (the inherent bw risk associated with growthier cattle) than you have the potential to be compensated for. Applying this to the recips scenario, milk yield is likely the single largest factor in terms of ET calf performance. In traditional beef cattle production, we have to settle for more of a middle of the road (close to center on the terminal vs maternal pendulum) approach to cow selection, as the cow's genetics are at play in the resulting offspring as well. While a far right(maternal) of center cow would certainly offer a higher level of maternal quality, we're forced to compromise as we can't avoid the antagonisms associated with the higher level of maternal influence being transmitted through to the resulting calf- which inevitably results in reduced terminal performance.
BUT
With surrogates, we should no longer have this concern. The terminal quality of the recip has no application. This component that we had to otherwise keep in check with traditional production, now becomes completely irrelevant. Here, we can reap the benefits of moving right of center without having to accept the antagonisms.
With that said, I think you ought to give the idea of using Jersey as the other component to your f1 recip a good bit of consideration. These are cattle that are highly fertile, moderate in size, have exceptional weight adjusted pelvic capacity, and, short of Holsteins, are as good of milkers as they come- both in terms of quantity and quality. Additionally, the red angus component should provide more than enough hardiness to offset any real or perceived shortcoming with the cross allowing you to arrive at an animal, IMO, as perfectly suited for the task as possible.
Mill Iron A said:
My apologies on not understanding there was a large difference between Galloway and Lowlines.
With 1000lbers in both breeds (and in all breeds), I'm wondering which is the apple, which is the orange