Download the Udder Scoring Fact Sheet.
Udder quality represents one of the most important convenience traits in commercial beef production. Some would argue that udder quality represents an economic trait as poor udders require additional labor inputs and thereby decrease profitability.
Seedstock producers should manage udder quality closely, says Bob Weaber, University of Missouri Extension beef genetics specialist. “Your commercial customers expect trouble-free cattle when they make a purchase at your farm or ranch. Don’t give your customers a reason to buy genetics from another source to ‘clean up’ udders produced by your bulls.”
Cows with good udder quality not only take less labor but also may have improved longevity due to lower incidence of mastitis or injury. “Poor udders, especially large teat size, may delay timely colostrum intake by calves, resulting in poorer transmission of passive immunity,” Weaber explains.
Hereford breeders are encouraged to report udder scores to the American Hereford Association (AHA) to be utilized in genetic evaluation.
In July 2008 the Beef Improvement Federation (BIF) adopted a two-score system for evaluating udders. The AHA Board of Directors followed suit and adopted the same system during its August 2008 meeting.
Udder and teat quality are two of the most important functional traits. Udder and teat soundness are a concern for a number of reasons:
- Labor associated with extra costs and reduced convenience;
- Longevity, which may be reduced because of injury or mastitis;
- Calf performance, affected by a reduction in milk flow, or lower colostrum intake by newborn calves having difficulty nursing oversized teats; and
- Udder and teat characteristics appear to be heritable. This means that there is definitely is variation in the udder quality of daughters from different sire groups. Thus, change can be made through selection.
Scores range from 9 (Very Small) to 1 (Very Large, balloon shaped) and are subjective assessments of teat length and circumference. Oversized teats are difficult for newborn calves to nurse and the calf may not receive adequate colostrum, which could lead to a higher incidence of scours or decreased immunity levels in the newborn calf. In Canadian studies, cows with more desirable teat scores had calves that nursed sooner after birth.
Scores range from 9 (Very Tight) to 1 (Very Pendulous) and represent assessments of udder support. Weak udder suspension results in pendulous udders that make it difficult for a calf to nurse. Weak suspension in the udder indicates a lack of support in the ligament that ties the udder to the cow’s body wall. Over time, weakness in this ligament will allow the udder to hang down too far from the body and may subject the udder to serious problems and increased potential for injury.
Udder Suspension Teat Size
Very Tight Very Small
Very Pendulous/ Very Large/
Broken Floor Balloon Shaped
How to Score
Udder and teat scores should be taken (on the weakest quarter) within 24 hours of calving. Scores should preferably be taken by the same person throughout the calving season.
With the new system, producers score both teat size and udder suspension. The scores for both characteristics range from 1 to 9.
“A two-score system allows independent evaluation of teat size and suspension characteristics,” Weaber says. “While there is a general trend for cows with large teat size to also have poorer suspension, this is not always the case. The independent scoring of the two important udder quality traits allows more precise measurement of each trait. Even though these scores are subjective, they’ll do a better job documenting variation in udder quality than a single-score system. When the two scores are used, the heritability estimates for each trait should be higher due to increased precision of measurement.”
Weaber suggests producers get in the habit of scoring udders when they collect calving ease data. “Make udder score collection a routine part of your performance data collection,” he says. “Until you get comfortable with the scoring system, tape a scoring guide to your clipboard or reduce on a copy machine and tape in your ‘red book’ for use in the field. Try to get as close as you can to the guide and be as consistent as possible.
“Once you do it for a while, you’ll start picking out the really good ones and really bad ones easily. Be honest with yourself and use as much of the scale as needed. If she’s a ‘1’ on suspension and ‘1’ on teat size, give the scores. Your customers expect it!”
Udder Score Examples
Udder Score 21
Udder Score 33
Udder Score 55
Udder Score 74
Udder Score 77
Udder Score 99
Hereford breeders record udder scores on the Registration Application/Birth Information Worksheet (Form 1).
According to Jack Ward, AHA chief operating officer and director of breed improvement, with the new system, breeders will list the score in the same field used previously, but instead of recording one score, they will input the two digits. The first digit will be the udder suspension (attachment) score, and the second digit will be teat size. For example, if a cow has an attachment score of 7 and a teat size of 5, the breeder will record 75 in the “dam udder score” column.
Research shows udder and teat characteristics are heritable; thus, change can be made through selection.
“Consistent and steady progress can make dramatic improvements in udder quality,” Weaber says. “Help yourself and your customers by selecting for and culling on udder quality. Improving and monitoring udder traits will pay dividends in the long run.”
In November 2010 the AHA Board implemented a policy requiring DNA on all future walking herd sires. Therefore, any sire born after Jan. 1, 2011, must have DNA on file at the official AHA lab — GeneSeek Inc. — prior to registering calves out of that bull.
>> more information
On April 9, 2013, the American Hereford Association (AHA) released new genomic-enhanced expected progeny differences (GE-EPDs) based on new correlations updated because of the addition of more than 2,000 animals with 50K genotypes. >> Read more
Check out these DNA testing resources:
• DNA Testing Procedures Fact Sheet
• How to Collect Samples video
To request DNA kits or for more information, contact Toni Shapiro at 816-842-3757 or firstname.lastname@example.org.