i really dont know about the longhorn crosses, but we have (2) 12 year old cows that grow about a half inch a year. i would think that the holstein/hereford cross will put a very limiting factor on it.
it is easier to breed to take horn off, then to breed to put horn on.
that growth spurt for a bull while he is young is quite amazing.. they can grow 3 inches per month or better if you have a bull that is world class for horn growth.
for each month that goes by, the growth pattern gradually slows down. 90% of a bull's horn growth is obtained by the 3rd? year. after that is still grows but never like when he was young.
for cows, they have a different growth pattern than the bulls, they take longer to grow out their horn. where a bull is growing the 3 inches a month, the heifer at the same age is growing 2 inches a month... both being yearlings.
polled = dominate
horned = recessive
what is truly amazing to me, is the growth that deer elk, moose, caribou, etc. have on their horns, then shed that and start over again,, too bad we cant take some genes for that kind of horn growth, insert that into longhorns, and at the same time take out the yearly shedding part... man oh man,, we could grow some horn then !!!
magpie