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New bull time
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<blockquote data-quote="Warren Allison" data-source="post: 1819520" data-attributes="member: 40587"><p>Simm sire and ang dam, or vice versa, will still yield a bull that 50% of his calves will be 1/2 Simm calves and the other 50% of his calves will be 1/2 Angus. No other way they can be. All of his chromosone pairs will be 1 Simm set and 1 Ang set, The sperm cells will have either a simm strand or an Ang strand. This is not a matter of opinion to agree or disagree open. It is just scientific fact. At that f1 stage there is no SimmAng DNA. A breed does not become a stabilized breed with its own DNA until the f3 cross. You breed a 1/2 Simm 1/2 Angus to say a Charolais. Half the calves could be 50% Simm and 50% Charolais. The other half could be 50% angus and 50% Charolais. There is no way for it to be other wise, That half breed bull can contribute only one of two possible chromosones..either Simm chromosones or an Angus chromosones. Not saying those aren't fine bulls, or that a lot of people use their semen. I am saying that the sperm in that semen will contain either Simm or Angus DNA. The only possible characteristic that is 100% guaranteed to be consistent, is color, IF the Simm parent was homozygous for black. Granted with a gazillion sperm in each ejaculation...a half gazillion Angus sperm and half gazillion Simm sperm in each straw, and you breed 20 cows, the chances are good all 20 will get a Simm sperm , or all 20 get an Angus sperm. Or 19 and 1, 18 and 2, all the way to 1 and 19. That was what whoever started this meant when he said you'd get better consistency using a pb black Simm than a 50-50 Simmangus.</p></blockquote><p></p>
[QUOTE="Warren Allison, post: 1819520, member: 40587"] Simm sire and ang dam, or vice versa, will still yield a bull that 50% of his calves will be 1/2 Simm calves and the other 50% of his calves will be 1/2 Angus. No other way they can be. All of his chromosone pairs will be 1 Simm set and 1 Ang set, The sperm cells will have either a simm strand or an Ang strand. This is not a matter of opinion to agree or disagree open. It is just scientific fact. At that f1 stage there is no SimmAng DNA. A breed does not become a stabilized breed with its own DNA until the f3 cross. You breed a 1/2 Simm 1/2 Angus to say a Charolais. Half the calves could be 50% Simm and 50% Charolais. The other half could be 50% angus and 50% Charolais. There is no way for it to be other wise, That half breed bull can contribute only one of two possible chromosones..either Simm chromosones or an Angus chromosones. Not saying those aren't fine bulls, or that a lot of people use their semen. I am saying that the sperm in that semen will contain either Simm or Angus DNA. The only possible characteristic that is 100% guaranteed to be consistent, is color, IF the Simm parent was homozygous for black. Granted with a gazillion sperm in each ejaculation...a half gazillion Angus sperm and half gazillion Simm sperm in each straw, and you breed 20 cows, the chances are good all 20 will get a Simm sperm , or all 20 get an Angus sperm. Or 19 and 1, 18 and 2, all the way to 1 and 19. That was what whoever started this meant when he said you'd get better consistency using a pb black Simm than a 50-50 Simmangus. [/QUOTE]
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