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Bull Care Seminar. Cow Calf Seminar-UW Extension Livestock Team Elk Mound- March 23 Almond-March 25 Platteville-March 26. Prepared by Keith Vander Velde, UW Extension Agriculture Agent, Marquette County. Bull Care Seminar. Bulls are the source of New Genetics and Can Change Herd Color - PowerPoint PPT Presentation
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Bull Care Seminar
Cow Calf Seminar-UW Extension Livestock Team
Elk Mound- March 23
Almond-March 25
Platteville-March 26
Prepared by Keith Vander Velde, UW Extension Agriculture Agent, Marquette County
Bull Care Seminar
Bulls are the source of New Genetics and•Can Change Herd Color•Will Affect Growth Rate•Do Affect Herds Future Milk Production•Can Affect Disposition of Calves•Are Capable Shorten or Lengthen Breeding Season•Can Infect Herds with Reproductive Diseases•Do Require Some Management Different from Cows•Are A Major Capital Investment
Bull Care Seminar
Cow Herd Investment 30 cows at $800=$24,000 One Bull at $1,800=$1,800
The Bull contributes 50% of genetics in the calf crop
Bull Care Seminar Yearling Bulls Use on the Increase
Bull Test Stations sell as yearlings More breeders sell Bulls as yearlings Currently larger-weighing 1200 lbs + Sexually mature Most current genetics Aggressive breeders
Bull Care Seminar
Yearlings Vs Two Year Olds Yearlings sire more calves lifetime
Fifteen additional calves as yearlings Assume five years of 30 calves/year
Yearling will produce 165 calves Two Year old will Produce 150 If yearling cost $1,800, 2 yr old will be
$2,000 Direct Cost/calf yearling=$10.90 Direct Cost/calf 2 yr old =$13.33
Bull Care Seminar
Yearling Bulls Weigh 60-70% of mature size Raised and evaluated to show
differences Should be purchased 60 days before
used Require letdown period Need some physical conditioning Should sire 100-150 calves in lifetime
Bull Care Seminar
Nutrient Requirements of Bulls Weight Daily Gain DM Protein
%TDN 1600 0.0 26 1.8 48 1600 1.0 30 2.2 56
Bull Care Seminar
Yearling Bulls Are Active During Breeding Season Lose 100-300 lbs during 90 day period Need management to insure they
reach 75% of mature size by 24 month This requires some additional feeding
Bull Care Seminar
Developing Bulls Example: 1350 lb yearling bull
Losses 200 lbs in 90 day breeding season Mature size is 2100 pounds Needs to Weigh 1575 at 24 months Needs to gain 425 lbs (1575-1150) in 275
days Needs to gain 1.55 lbs per day once
removed from cow herd
Bull Care Seminar
Management During Breeding Season
In multi-bull pastures group bulls by Size Age
Avoid situations where dominance can happen
Dominant bull may be sterile or sub-fertile Dominant bull will keep other bulls from
serving cows
Bull Care Seminar
Limit the Length of Breeding Season
Most producers have a defined calving period
A 60-90 breeding season is recommended
Remove bulls at end of breeding season
Very important for young bulls
Bull Care Seminar
Leaving the Bull Out Too Long Length of breeding season matters Oklahoma, Texas, New Mexico Study, Glenn Selk,
OSU Extension Animal Reproduction Specialist 394 Ranch Records Positive relationship between number of days of
breeding season on cost per hundred weight of calf weaned
For each additional day of breeding season the cost per cwt increased by 4.7 cents and pounds of calf weaned per cow decreased by 0.158 pound
Bull Care Seminar
Leaving the Bull Out Too Long Conclusions: 365 day breeding season results in additional
cost of $13.63 per hundred weight of weaned calf as opposed to the 75 day breeding season.
365 day breeding season results in 46 fewer pounds sold per cow per year when compared to 75 day breeding season
On a 50 cow operation the impact is: Two thousand ninety one (2291) less lbs sold An increased cost of $68.15 per head for 500 lb calf $3408 increased cost assuming 100% conception rate
Bull Care Seminar
Observe Bulls During Breeding Season Insure cows are cycling Check bulls for signs of over dominance Check bulls for signs of injury and lameness Remove bulls getting too thin Consider using a bull breeding stall
6-8 lbs of grain at $0.05 per day for 75 days(8 x .05 x 75=$30)
Bull Care Seminar
After the Breeding Season Remove Bulls Pen Away from Cows Here Dominance is Useful
One Bull in Charge=Little Fighting He stops all fights-Many producers keep one older bull
for this reason, some use burro jack or billy goat Always put electric fence around pen or pasture
Keeps bulls in and helps when fighting occurs Consider a safe corner for bulls with electric wire
overhead
Bull Care Seminar
What About Next Year Vaccinate bulls for:
IBR BVD PI-3 Lepto Vibro Other diseases local veterinarian
recommends
Bull Care Seminar
What About Next Year Conduct Breeding Soundness Exam(BSE)
Visual evaluation of eyes, feet leg, and external genitalia
Palpation of accessory organs, seminal vesicles and prostate
Semen sample evaluated for motility and abnormal sperm cells
Scrotal circumference measurement and palpation of testicles and epididymis
Exam the extended penis
Bull Care Seminar
What About Next Year One of the biggest problems affecting bull
fertility is frost bitten testicles This occurs when bulls lay down and the scrotal wall
touches the ground. Common occurrence in older bulls with large scrotums Can be prevented by giving bulls a straw pile to lay on
the gives separation direct contact to frozen ground Reduces fertility since the epididymis that stores the
sperm as it matures is damaged and temporarily renders the bulls infertile. Sperm is area of the scrotum for 60 days so what happens today does not show up in semen samples for 60 days.
Bull Care Seminar
How Many Cows or Heifers Per Bull This is one of the most common
questions asked The recommended answer is one female for
each month of age However, every bull is different and the
scrotal size and levels of maturity seem to be increasing with age
Bull Care Seminar
Thank you for your attendance Please take a moment to complete the
evaluation form We will be around for questions after
the session Have a safe trip home
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