Even though ultrasound technology and its application to the beef industry is still in its "calf" stage, the demand for carcass information is growing and maturing rapidly. With each breed association reporting ultrasound data and carcass EPDs independently, comparing the numbers becomes difficult and extremely confusing. In response to countless requests from breeders and buyers alike, a grass-roots explanation of ultrasound data as it is collected "chute-side" is long overdue. A step-by-step description of each image collected is a good method to help beef producers understand the traits measured and how to incorporate them into selection programs, regardless of breed or background, farm or feedlot.
In beef cattle of European ancestry the trait of being polled or having horns
is determined by one pair of genes. One gene in the pair is inherited from the
dam and the other from the sire. The polled gene (P) is dominant to the horned
gene (p). If an animal has two polled genes(PP), homozygous, or one polled and
one horned gene (Pp), heterozygous, it will be polled. However, if it is
heterozygous polled (Pp) it may pass either the polled or horned gene on to its'
offspring. The only situation when an animal will be horned is when it possesses
two recessive horned genes (pp), homozygous horned. Table 1 illustrates the
expression of polledness or horns and what genes and traits can be expected to
be passed to the offspring from the various matings.
Even though ultrasound technology and its application to the beef industry is still in its "calf" stage, the demand for carcass information is growing and maturing rapidly. With each breed association reporting ultrasound data and carcass EPDs independently, comparing the numbers becomes difficult and extremely confusing. In response to countless requests from breeders and buyers alike, a grass-roots explanation of ultrasound data as it is collected "chute-side" is long overdue. A step-by-step description of each image collected is a good method to help beef producers understand the traits measured and how to incorporate them into selection programs, regardless of breed or background, farm or feedlot.
Prepared by IBBA Ad Hoc Fertility Traits Committee*
In any cowherd, reproduction is arguably the single most important trait driving profit. If cows don’t get pregnant, genetic components for growth, carcass merit or maternal ability are not expressed.
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