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What Should Be Considered in Bull Selection

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What Should Be Considered in Bull Selection W 333 What Should be Considered in Bull Selection F. David Kirkpatrick, Professor, Animal Science directional changes in economically important traits. If the color of the offspring is an important factor, you need to understand the inheritance of color in cattle and how the consequences of the breed you select will affect market demand. Do I save replacement heifers? If heifers are to be retained from within the Selecting sires is an important decision that herd, then producers should consider the producers make in cow-calf operations. In a bull’s EPD for milk. A bull that has a milk single sire herd, the bull is responsible for EPD that is below his breed’s average will one-half of the genetics of the entire calf most likely sire daughters that do not have a crop. The last three sires used in the propensity for excellent milk production. If operation will represent almost 87 percent of feed resources are limited in a beef the genetic makeup of a calf crop in a herd operation, selecting a bull that has a milk where replacement heifers are retained. One EPD that is extremely above the average of of the first requirements before selecting a his breed could drastically affect the future new herd sire is to determine your herd’s reproduction of his daughters. present level of production and decide what traits need improvement. Higher levels of milk production require higher levels of feed resources in order to What breed do I need? retain a high reproductive rate. Consequently, selecting and using a bull that Producers can make their selections from a has a milk EPD that is extremely below the wide variety of breeds. Select a breed that average of his breed could reduce the has a market demand for their offspring in weaning weight of his daughters’ calves. your marketing area. Also, select a breed Most breed EPD averages for all traits are that has a performance program for which not zero. It is important to obtain a recent you can document the expected performance up-to-date breed sire evaluation report to of future progeny. No one breed exceeds all determine different breeds’ average EPDs other breeds in all traits of economic for different traits. These sire evaluation importance. Within the breed of cattle you reports can be obtained by writing to the select, make sure that the prospective sire particular breed association or finding them has the genetic potential to make positive on the Web. What if I do not save my process. The largest amount of calving difficulty occurs in first- and second-calf own replacement heifers? females. It is important to select a bull that is If heifers are not saved from within the herd, used on all females in the herd that has a milk EPD does not have to be considered in birth weight EPD that is below his breed’s the selection process. Emphasis should be average. If replacement females are to be given to other traits of importance to your synchronized and artificially inseminated to herd, such as increased growth rates. a low birth weight EPD bull, then more latitude in birth weight and calving ease Do I need to increase EPDs for the bull selected for the mature weaning weights? cows is allowed. If weaning weights need to be increased, Do I want to increase the then a bull that you want to consider needs frame size of my calves? to have an EPD for weaning weight that is higher than his breed average. If your If calves are discounted at the market due to previous bull was of the same breed as the frame size, then the frame size of the bull bull that you are considering, his weaning needs to be considered in the selection weight EPD needs to be greater than the procedure. Frame size is one of the highest previous bull’s EPD. If you want to change heritable traits (about 45 percent) in beef breeds, then select a bull that exceeds his cattle, so directional changes in frame size breed’s average EPD for weaning weight. can be realized fairly rapidly. Small-framed EPDs are useful only for comparing bulls sire small-framed calves. If frame size prospective bulls within the same breed and needs to be increased in your calf crop, a not between breeds. There is a positive bull with a larger frame size than the present relationship between increased weaning one being used should be selected. weight and increased birth weight. As we Selecting a large-framed bull that is tend to increase weaning weights and extremely different in size than the mature growth, we tend to increase birth weights. cowherd may present calving problems Make sure that as you find bulls with high because there is also a positive relationship weaning weight EPDs that they do not have between mature size and birth weight. Strict excessively high birth weight EPDs or low- attention must be given to the birth weight calving ease EPDs. It is important to EPD of extreme-framed bulls that are understand that higher numeric calving ease considered for selection. In addition, as you EPDs are associated with fewer calving select a calf crop with increased frame size, difficulties. note that there tends to be a “frame creep” in the replacement heifers that are retained. Will I use this bull on You will eventually increase the mature size mature cows and of the cowherd, and if feed resources are not available to support larger framed females, replacement heifers? reproduction may suffer. If you use the same bull on mature cows and first- and second-calf heifers, then you need Does my percent calf crop to consider the bull’s birth weight EPD. Dystocia (calving problems) is highly weaned need improvement? related to birth weight. Larger calves at birth The single most economically important experience more difficulty in the birthing trait in beef cattle production is 2 reproduction. Many factors have an effect breed association sire evaluation programs on reproduction and using them as indicator have scrotal circumference EPDs. These traits may improve percent calf crop EPDs should be considered in herds where weaned. Heavier actual birth weights replacement females are to be saved. certainly have a bearing on reproduction as Research has indicated that bulls with larger they increase the frequency of calving scrotal circumferences sire daughters that difficulties. Females experiencing calving reach puberty at earlier ages than those sired difficulties usually require a greater length by bulls with smaller scrotal circumferences. of time to return to estrus and, if eventually Selecting prospective herd sires with larger re-bred, calve later in the calving season the scrotal circumferences and positive scrotal following year. Also, females that have circumference EPDs is an indirect selection difficult births produce calves that are more procedure for improved reproductive susceptible to sickness and death and can efficiency. drastically affect percent calf crop weaned. The consideration of birth weight EPDs can Is the temperament of the provide a producer a means of protecting bull important? against dystocia (calving difficulty). Some Temperament in beef cattle is inherited. Ill- breeds now include a calving ease EPD, tempered cows usually produce calves that which is a measure of how easily a are ill-tempered. Some research reports particular bull’s calves are born to first-calf indicate that the heritability for temperament heifers. They are either reported in ratios or is 40 percent. Pay attention to the attitude of absolute figures. The higher numbers (both the prospective herd sire in order to ratios and absolute figures) are indicators of eliminate more temperament problems fewer calving difficulties. within your herd. Extremely high milk production levels of a cow herd with limited feed resources also Should I be concerned may have a detrimental effect on reproductive rate. Caution should be taken about carcass traits? when attempting to maximize milk Most cow-calf producers do not concern production levels in replacement females themselves with the potential carcass that are expected to be productive on poor qualities of their calves because they feel forage quality and/or quantity. Utilizing like they only sell weaning weight. milk EPDs and being aware of the breed However, with the emphasis in the industry average in the sire selection process can on carcass value, carcass predictability will guard against this problem. continue to play a more important part in The prospective herd sire should have merchandising feeder cattle, especially if passed a Breeding Soundness Examination you used the method of cooperative (BSE) within the last 30 to 45 days prior to marketing of feeder cattle to merchandise selection. This is an exam where a complete your feeders. Many breed association sire semen and physical evaluation of the male evaluation reports provide carcass EPDs on reproductive system is administered. It bulls, which can be used in designing feeder should be performed by a qualified cattle with carcass predictability. Producers veterinarian. Scrotal circumference is that participate in the Tennessee Beef measured in the exam and a 12-month-old Evaluation Program are aware of the value bull should have a minimum scrotal of selecting for improvement of carcass circumference of 31 centimeters. Some traits. 3 Where can I find a bull that association consignment sales, performance- tested bull sales and central test station sales. will fit my needs? Many state and geographical breed There are many sources of bulls with associations sponsor sales of animals documented and predicted performance. consigned with performance records and Purebred breeders that maintain EPDs. performance records on their beef cattle One thing to keep in mind is that it is operations and submit those records to their sometimes difficult or expensive to find a breed associations will have both adjusted bull that exceeds breed averages in all traits.
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