You said "Seem" to be larger. Unless accurate birthweight records are kept and compared with the records from other years included the weather records there is no way to prove it.
As you know In a hard cold winter cows tend to eat more but that extra nutrition is used to stay warm and does not go to the growing calf.
If the cows are grossly overfed in the last 6 weeks of gestation then yes it can result in a bigger calf than normal.
I had a neighbor with a hand full of cows,His cows were lard asses and as a result every calf needed to be pulled.
I suggested he leave the oats in the bin cause for these cows it does more harm than good but he wouldn't listen.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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