lithuanian farmer":3iq8qdgv said:
Lighter boned heifers and cows have more calving problems, because that they have more narrow pelvic bones. It's in the Belgian Blue and Piedmontese breeds. They calve okay until the calf gets wider. Lighter boned cattle usually has low BW. A friend of mine has a small beef farm, always used only low BW bulls and left their daughters as replacements and then used low BW bulls on them too. Now his heifers can't calve naturally, always needs to do c-section, and only about one quarter of cows can calve naturally even that bulls he use produce small calves. Now he's going to slaughter all his cattle and then buy new cows or heifers. Our heifers also were born quite small, guess ~75-85lbs, so deliver 110lbs+ the first calves were a problem. Don't worry much about their another calves, despite that girls will get in calf to the same bull.
I always understood it that the muscling was the bigger culprit, tho I could be wrong.
That is why I think the DM breeds have been selected for calves that show the muscling after birth, weeks after being born, over sires that have thrown calves displaying the "double muscling" at birth.
I thought it wasn't just the dam's pelvis, but the structure of the calf the dam grew in her womb.
We've seen some problems before we started crossing with breeds for better calving. The high percentage blood that we had used in the past (15-20 years ago) before better selection was in place often had a heavily muscled cow birthing a heavily muscled calf.
My understanding is that now the calves develop more of the muscling after the birthing process, that is one of the sire selection traits?