Taken from – http://www.midlandbulltest.com/blog/
Thank you Rachel Sutherlin for being our guest blogger! Rachel is completing her internship here at MBT this month. We sincerely appreciate her work at MBT and wish her the best of luck as she returns to her schooling!
Birth Weights… HOW LOW DO YOU GO!
We don’t want to give up power and torque when it comes to our vehicles because we expect optimal performance. So…why do we select for below average birth weights and not push our cows to the same standards of optimal performance? It is often said that too much of a good thing is bad? In light of low birth weights, have we pushed too far? Are they beginning to cost us too much? Have we passed that pinnacle point of diminishing returns? Where do we draw the line between low birth weights being a positive or negative attribute?
A dead calf is worth nothing…and no one wants to deal with a hard pull! Keeping birth weights in check is important; but, are we putting too much emphasis on a negative birth weight EPD? A cow should be able to deliver a calf weighing 7% of her body weight without assistance. If she can’t, send her to the cull pen? Recent trends are driving birth weights lower and lower resulting in much smaller calves… sometimes 60lb or less. Producers are paid by the pound at weaning or on the rail and those ultra small calves NEVER catch up! Why are we cutting ourselves short by not making our cows work for us?
If our goal is to save time and labor as we breed for small calves at birth; we must also assess how much extra work and effort a dink calf will require. A dink calf can cost many long hours in the calf warmer because they don’t get up on a cold nights; followed by hours in the maternity pen suckling because they can’t get the job done! The same dink calf may die because he is too weak to get up if he is born in the middle of the night. Sometimes theses calves aren’t big enough or strong enough to sustain those first few hours. What is the point of these ultra low birth weights if they result in exponentially higher labor costs and cause your death loss to sky rocket? You are then faced with the decision of breeding or culling those cows who lost their calf even though you purposefully bred her to produce that dink calf who was unstable to survive! You are essentially undermining the stay-ability of your mother cows by setting them up for failure.
We need to make our cattle work for us to minimize cost and effort! We must be especially mindful of undermining her ability. Using a low BW bull on a cow sired by a low BW bull can produce a smaller pelvis in her female progeny. As a result, you have just exacerbated your problem as the offspring will have an even harder time calving….even low birth weight calves. We must consider the big picture and the long-term effects to determine whether we are hurting or helping ourselves. Low birth weights are good for first time heifers and small framed cows; but, we need to push those bigger birth weights on cows to maximize our return….and they should be able to handle it!
We need to make our cows work for us. Don’t lose money on the first day! We have to focus on not turning these lower trending birth weights into a bad thing!