Effective Use Of Genomics In Sire Selection & Replacement Heifer Management

Mar 16, 2015

For more than half a century, progeny testing has been the foundation of genetic selection programs in dairy cattle, and it has led to rapid genetic gains in traits such as milk production, for which breeding values of bulls and cows have increased by roughly 200 pounds per year.

However, progeny testing is expensive and time-consuming due to a long generation interval in cattle, and it is not an effective method for improving traits that are difficult or expensive to measure routinely on commercial dairy farms, such as feed efficiency. Whole genome selection, more commonly known as genomic selection, refers to using information about single nucleotide polymorphisms (SNP) markers in the cattle genome to predict the genetic merit of young animals that have no offspring or performance data at the time selection decisions are made.

The information obtained by genomic testing a young heifer or bull is compared with genomic data from a reference population of older animals of the same breed. The Council on Dairy Cattle Breeding (CDCB) provides routine genomic predicted transmitting abilities (PTA) for US dairy cattle, and more than 800,000 dairy bulls, cows, heifers, and calves have been tested to date. Genome-Tested Young Sires Virtually every bull offered to US dairy farmers has been chosen based on the results of genomic

At the 2015 Western Dairy Management Conference, UW-Extension Dairy Scientist Kent Weigel discusses the use of genomics in sire selection.

Source:uwex.edu

Video: FLEECED! Sheep Shearer Hands Over Clippers!

It's sheep shearing day at Ewetopia Farms! ?? Our Dorset lambs and ewes are getting fleeced — and for the first time, our shearer hands over his clippers to a beginner. We finish shearing the last of our adult ewes and this year’s Dorset ewe lambs.

From moving the sheep between barns, loading them into chutes, and watching the wool come off, this is always one of the most satisfying days on the farm. But this video has a twist — we welcomed a new helper, Gian, who’s not only lending a hand but also learning how to shear! With guidance from our experienced shearer, he got a crash course in sheep shearing and even tried his hand at shearing a couple of lambs himself.

You’ll see firsthand how both teacher and student handled this unique challenge. Shearing is more than just removing wool — it’s about sheep health, comfort, and giving us a closer look at the flock. It’s always amazing to see the transformation from woolly sheep to freshly shorn ewes and lambs.