ksahrut laws are made as laws, that is, it doesnt matter if it is fertile or not, the law says: do not use an egg with a blood spot since it COULD BE fertile so to prevent infractions of the law, all eggs with blood spots are not to be eaten. there is no room for discussion or debate because then there would be a debate on which stage of development the egg spot is in and whether or not at a particular stage u can or cannot eat it. think about having to cook and checking every egg spot to see if it is developing or not. same as the salmon cunundrum of scales. when a salmon or some other fish, cant remember name, is a baby fish it has no scales therefore theorectically it is not kosher. but as an adult it has scales therefore it is kosher so now there are some sects that wont eat salmon because of this!! (no more bagels and lox hahah)... and that is why there are usually more then one sign for an animal to be not kosher or kosher so that there is no arguement (a camel chews its cud but doesnt have a split hoof but a toenail (its not a hoof) therefore not kosher. a pig splits its hoof but doesnt regurgitate. the discussions are endless.
to gargoyl.e, that was an amazing clip... my father is really in to jewish heritage in the states, and there is alot of info now about jewish cowboys (in tuscon no less) , he himself has family that were rum runners during the prohabition (they were minor mafia in the jewish mafia in new york before the irish and italians took over) so this will be of interest to him.
btw, thats one of the reasons why all the kibbutzim in israel were agricultural in the beginning (now we are all industrial /tourism oriented, almost no agric.

) , to get away from the 'stigma' of city/middle man etc.the idea was to feel the earth ; my
grandmother was horribly disappointed that i married a 'farmer' as my previous husband was, of course, a kibbutznik who from age 16 worked the fields (cotton and vegetables and winter wheat) and didnt ever go to college. so her dream of me marrying a lawyer doctor or whatever was destroyed by marrying a jewish redneck (literally from working in the desert fields)... my son is the same. and i was a goat herd for 10 years. (there went my college degree downt hte drain, or up in goat turds as it were). and present husband raised buffalo and never went passed 6 th grade.adn was a migrant worker from thailand for our very same fields..
and my first introduction to a chicken was in a jewish camp in maryland; i was a teenage nerd, bookworm, and loner, they put me in the 'worst' job in the camp apart from kitchen duty. i had to catch chickens, check for diseases, collect eggs, muck out the makeshift coop, and i was in seventh heaven . my parents are sure im a changeling cause apart from my dad raising pigeons on brooklyn rooftops, no one in either family ever had animals. and ive had kid goats in my bed with me....
bina