Redneck Mafia
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Registered: Aug 2013
Location: Seneca, Mo
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quote:
Originally posted by yadkinriver
I think a closer look should be taken to genetics. I disagree that all pups in the same litter are twins. It's possible that they are very different. If they match up close on phenotype (looks) and genotype (actions) the more likely to be closely related. Then you could make a brother and sister mating and come closer to almost cloning the parents. You can possibly breed distant cousins that match and be breeding closer than you think. Still it's done on observation so nothing is a sure thing or we would all be hunting !00% winners. Then again, how could that happen?
All pups in the same litter are twins, dizygotic (paternal) unidentical meaning they are born from the same birth but conceived from separate eggs and sperm cell therefore having different but similar DNA. Identical twins, monozygonic twins known as identical in our human world, share even the same DNA are possible resulting from one egg and sperm cell then dividing to form 2 or more (more not documented but is still possible). Here is the kicker identical twins in dogs may not look the exact same but will have the exact same amount of hairs of each color but markings may be placed differently, something discovered in cloning of dogs which is essentially making a twin with identical DNA.
Back to the subject of multiple crosses, it has been our experience that when the first cross worked well across board the 2nd has also. I believe the environment they are given to start plays a very big part.
Another thing to think on is that those who breed racehorses or greyhounds do not breed old females, many won't breed a female dog over age 4. In humans we know that after age 30 the risk for pregnancy and birth defects go up and by age 40 significantly. The same could very well hold true in our dogs. Females are born with all the eggs they will ever have where sperm regardless of age is constanly replaced with new. The risk of gene mutation and birth defects increase with a females age. How are we to know when a dog or dogs from a litter have been born MR? Many of the old breeders liked to breed females on their first or second cycle and will swear this is where her best crosses came from and scientifically could be right.
Jen
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03-06-2018 10:44 PM
