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Beef Cattle Research Update-September 2014

September 16, 2014

Beef Cattle Research Update Sept2014

Response of Beef Cows Offered a Chlortetracycline-Fortified Mineral and Either Strip or Continuous Stocked to Stockpiled Fescue

(M.S. Gadberry et al., University of Arkansas)

Food and Drug Administration proposed changes to the United States feed law address judicious use of medically important anti -microbials. Cattle producers grazing Kentucky 31 tall fescue routinely feed mineral fortified with chlortetracycline.

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Effects of Injectable Trace Minerals at the Start of the Breeding Season on Attainment of Pregnancy in Commercial Beef Cows

(J. D. Arthington et al., University of Florida)

Our objective was to evaluate the effects of a single application of inject-able trace  minerals (ITM; MultiMin 90, Multi-Min USA, Inc., Fort Collins, CO) on pregnancy attainment of lactating beef cows. Mature Brahman × British crossbred beef cows (n = 3,750) were enrolled  from 14 separate commercial cow/calf operations in central and southern Florida.

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The Effect of Good or Poor Residual Feed Intake Sires on Feedlot Heifer Performance and Carcass Characteristics

(K. M. Retallick et al., CalPoly, University of Arizona and University of Illinois)

Performance and intake data were collected for 90 days on Angus yearling bulls (n = 8) to calculate residual feed intake on these potential sires. These bulls were then used as herd sires during the fall breeding season. The Angus × Simmental heifer (n = 84) progeny of these sires were randomly allotted to pens, managed similarly and fed a common diet

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Cost Analysis of Feeding Bermudagrass (Cynodon dactylon) or Ryegrass (Lolium multiflorum) Plus Rye (Secale cereale) Baleage Based on Nutrient Composition and Forage Refusal of Weaned Crossbred Beef Calves

(R. M. Martin et al., Louisiana State University)

In the Gulf Coast region, supplementation can be costly for weaned beef calves during the fallbackgrounding period due to limited forage production and quality. A study was conducted evaluating performance of weaned Angus crossbred calves fed bermudagrass (Cynodon dactylon) orryegrass (Lolium multiflorum) and rye (Secale cereal) baleage in hay rings during a 60-day fall backgrounding period.

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300-Day Grazing Discovery Farm

(T. R. Troxel et al., University of Arkansas)

The objectives of the 300-day grazing discovery farm were to reduce hay feeding to 60 days or less, 90% net calf crop, average weaning weight of 550 lb and implement management practices common and available to cattle producers. The demonstration pastures consisted of 40 acres of common bermudagrass, two 22.5-acre pastures of toxic endophyteinfected Kentucky-31 tall fescue, 22.5 acres of Ark-Plus novel-endophyte tall fescue and 22.5 acres of Ark-Plus fescue/common crabgrass mix.

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Hedonic Pricing Models for Angus Bulls Sold at Auction Following Performance Testing at Oklahoma Panhandle State University

(D. L. Stephens et al., Oklahoma Panhandle State University)

Selection of a herd sire has always been of paramount importance, given the initial financial investment and the sire’s contribution and effect on the genetic makeup of a beef herd. Data was collected from the nation’s longest consecutively run bull test conducted at the University Farm of Oklahoma Panhandle State University.

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Survey of Management Practices Used in the Implementation of Artificial Insemination and Estrous Synchronization Programs in the United States

(S. K. Johnson and G. Dahlke, Kansas State and Iowa State University)

Artificial insemination and estrous synchronization remain underutilized tools by U.S. beef producers. Little information is available on actual management practices used by producers who use these technologies and the value they have within their operation. An online survey tool was developed concerning a variety of production practices, synchronization methods and available tools used with artificial insemination and estrous synchronization.

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Reducing Winter Feeding Needs in Southern Arkansas Through the Use of Best Management Grazing Principles

(B. Stewart et al., University of Arkansas)

Research is being conducted at the University of Arkansas Southwest Research and Extension Center in Hope, Arkansas, to determine the impact of best management principles on production and winter feed requirements of spring calving cows (n = 72, body weight = 1,206 lb) grazing warm-season based pastures (n = 9, 10.6-acre pastures).

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Bale Diameter and Feeder Design Effects on Hay Waste

(D. Tomczak et al., University of Missouri) 

Forty-eight mid-gestation spring-calving cows were stratified by body weight (1,286 lb), body condition score (5.4) and age (5.6 years) into six pens to evaluate influence of bale  diameter and feeder design on hay waste. Tall fescue round hay bales (85.5% DM, 8.22% CP, 66% NDF, 60 inches height) were classified as small (51 inches), medium (93 inches) or large (74 inches) diameter and placed in hay feeders equipped with a cradle chain or without in a 3 × 2 factorial design randomly assigned to a 6 × 6 Latin square.

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