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An Investigation Into The Mechanisms Of Action Of Revalor-S And Optaflexx In Growing Steers (2006), D.K. Walker, James J. Higgins, B.J. Johnson, Evan C. Titgemeyer
An Investigation Into The Mechanisms Of Action Of Revalor-S And Optaflexx In Growing Steers (2006), D.K. Walker, James J. Higgins, B.J. Johnson, Evan C. Titgemeyer
Kansas Agricultural Experiment Station Research Reports
An experiment was conducted to evaluate the interaction between steroidal implantation and feeding ractopamine on nitrogen retention, blood metabolites, and messenger RNA (mRNA) expression. Six Holstein steers (initially weighing 509 lb) were implanted or not with Revalor-S (120 mg trenbolone acetate plus 24 mg estradiol-17β), and all were fed no ractopamine for the initial 28 days and then 2 grams per steer daily of Optaflexx (200 mg/day ractopamine-HCl) on days 29 through 56. Implantation increased nitrogen retention. Optaflexx increased nitrogen retention in nonimplanted steers, but did not significantly increase retained nitrogen in implanted steers. Implantation increased serum insulin-like growth factor …
Effect Of Implant Strategy And Optaflexx Administration On Feedlot Performance And Skeletal Muscle Β-Adrenergic Receptor And Insulin-Like Growth Factor I Mrna Abundance (2006), E.K. Sisson, J.P. Hutcheson, D.A. Yates, B.J. Johnson
Effect Of Implant Strategy And Optaflexx Administration On Feedlot Performance And Skeletal Muscle Β-Adrenergic Receptor And Insulin-Like Growth Factor I Mrna Abundance (2006), E.K. Sisson, J.P. Hutcheson, D.A. Yates, B.J. Johnson
Kansas Agricultural Experiment Station Research Reports
Feedlot heifers (1,147) weighing 622 lb were used to evaluate the effects of implant strategy and Optaflexx administration. Implant treatments included Revalor-200 (R200) at arrival, or Revalor-IH at arrival and reimplantation with Finaplix-H on day 58 (RF). Optaflexx (200 mg/heifer daily of ractopamine-HCl) was fed the last 28 days. Treatments were randomly assigned to 16 pens. After 182 days, heifers were slaughtered, at which time carcass data were obtained and semimembranosus muscle tissue was excised for RNA isolation. Optaflexx administration significantly increased average daily gain (0.7 lb/day), feed efficiency (3%), hot carcass weight (10.5 lb), and ribeye area (0.42 square …
Effect Of Optaflexx And Days On Feed On Feedlot Performance, Carcass Characteristics, And Skeletal Muscle Gene Expression In Yearling Steers (2006), S.J. Winterholler, G.L. Parsons, E.K. Sissom, J.P. Hutcheson, R.S. Swingle, B.J. Johnson
Effect Of Optaflexx And Days On Feed On Feedlot Performance, Carcass Characteristics, And Skeletal Muscle Gene Expression In Yearling Steers (2006), S.J. Winterholler, G.L. Parsons, E.K. Sissom, J.P. Hutcheson, R.S. Swingle, B.J. Johnson
Kansas Agricultural Experiment Station Research Reports
Two-thousand two-hundred fifty-two yearling steers (690 lb) were used to evaluate the effects of Optaflexx and days on feed on finishing steer performance and carcass characteristics. Treatment groups included serial harvest dates of 150, 171, or 192 days. Within each harvest date, steers either received Optaflexx (200 mg/steer daily of ractopamine-HCl) for the final 28 days, or did not receive Optaflexx. All steers were initially implanted with Revalor-IS and were re-implanted with Revalor-S after 75 days on feed. At harvest, muscle samples from the inside round were obtained for mRNA analysis of the β- adrenergic receptors (AR). Optaflexx increased daily …
Examining Death Loss In Kansas Feedlots, A. Babcock, R. Jones, Michael R. Langemeier
Examining Death Loss In Kansas Feedlots, A. Babcock, R. Jones, Michael R. Langemeier
Kansas Agricultural Experiment Station Research Reports
This study had three primary objectives: 1) to determine if there is an annual and/or seasonal trend in percentage of death loss in Kansas feedlots; 2) to examine the difference in death loss between steers and heifers; and 3) to evaluate if "in" weight has had an effect on percentage of death loss in Kansas feedlots. The annual trend in death loss for both steers and heifers was found to be significant and positive, indicating that death loss has been increasing over the sample period. Seasonal increases in death loss were significant for early-spring closeouts for both steers and heifers. …
Comparison Of Dectomax And Valbazen On Beef Cattle Carcass Traits (2006), J.A. Christopher, T.T. Marston, J.R. Brethour, Gerald L. Stokka
Comparison Of Dectomax And Valbazen On Beef Cattle Carcass Traits (2006), J.A. Christopher, T.T. Marston, J.R. Brethour, Gerald L. Stokka
Kansas Agricultural Experiment Station Research Reports
The objective of this trial was to determine if types of dewormers affected carcass characteristics. Crossbred steers (n=428) were stratified by weight and ultrasound marbling score and administered either Dectomax (subcutaneous injection) or Valbazen (oral) dewormer. Fecal egg counts indicated that both dewormers cleared internal parasites from the cattle. Carcass data indicated that Dectomax increased fat deposition as measured by 12th rib back fat; kidney, pelvic, and heart fat; and marbling score, when compared with Valbazen. Deworming products may affect carcass traits that are used to value cattle.
Performance Of Calves Born To Beef Cows Seropositive But Subclinical For Bovine Leukosis Virus (2006), Donald A. Llewellyn, K.L. Teutemacher, T.T. Marston, M.W. Sanderson, Larry C. Hollis
Performance Of Calves Born To Beef Cows Seropositive But Subclinical For Bovine Leukosis Virus (2006), Donald A. Llewellyn, K.L. Teutemacher, T.T. Marston, M.W. Sanderson, Larry C. Hollis
Kansas Agricultural Experiment Station Research Reports
Calves from a commercial beef herd were evaluated for weight gain differences based upon the bovine leukosis virus (BLV) serological status of their dams. One hundred forty-two multiparous cows from a commercial beef herd were tested for BLV by agar gel immunodiffusion. Eighty-nine cows (62.6%) were found to be seropositive for BLV. Weights were collected from all calves at weaning, from heifers on the date when selection of replacement heifers was made, and from steers on the day of harvest after being fed to finish weight in a feedlot. Offspring from seronegative cows tended to have heavier weaning weights (+17 …
Comparison Of Cidr To Mga In A 7-11 Cosynch Protocol With Timed Insemination Of Beef Heifers (2006), D.R. Eborn, G.E. Freneau, David M. Grieger
Comparison Of Cidr To Mga In A 7-11 Cosynch Protocol With Timed Insemination Of Beef Heifers (2006), D.R. Eborn, G.E. Freneau, David M. Grieger
Kansas Agricultural Experiment Station Research Reports
Previous research has shown that the 7-11 Cosynch protocol using melengestrol acetate (MGA) is effective in synchronizing beef heifers. This study compared MGA and a vaginal insert containing progesterone (CIDR) in the 7-11 Cosynch protocol on beef heifers. Replacement beef heifers (n=179) from three herds were assigned to MGA or CIDR treatments. Beginning on day 1, heifers on the MGA treatment were fed to consume 0.5 mg daily of MGA for 7 days. On day 7, the last day of MGA feeding, the MGA heifers received an injection of Lutalyse (PGF). Heifers on the CIDR treatment received a CIDR on …
The Effects Of Flaxlic Block Supplementation On Finishing Feedlot Heifers (2006), M.J. Quinn, E.R. Loe, A.S. Webb, M.E. Corrigan, James S. Drouillard, Brandon E. Depenbusch
The Effects Of Flaxlic Block Supplementation On Finishing Feedlot Heifers (2006), M.J. Quinn, E.R. Loe, A.S. Webb, M.E. Corrigan, James S. Drouillard, Brandon E. Depenbusch
Kansas Agricultural Experiment Station Research Reports
An experiment was conducted to determine the effects of FlaxLic supplement blocks, fed free-choice during feedlot finishing, on heifer performance, carcass quality, and fatty acid profiles of loin steaks. Heifers (n=302, 1059±7 lb initial bodyweight) were fed diets based on steam-flaked corn. Cattle were assigned to dirt surfaced pens (12 to 13 heifers/pen, 12 pens/treatment). Treatments consisted of control (no block) or FlaxLic free-choice block supplements. Loins were obtained from three animals randomly selected from each pen for measurement of fatty acid profiles. Average daily gain and feed:gain were not different over the 75-day feeding trial. Dry matter intake was …
Measuring Scope Efficiency For Crop And Beef Farms (2006), Michael R. Langemeier, R.D. Jones
Measuring Scope Efficiency For Crop And Beef Farms (2006), Michael R. Langemeier, R.D. Jones
Kansas Agricultural Experiment Station Research Reports
This study evaluated scope efficiency (the degree of efficiency gained from producing more than one product within the same farm) for a sample of crop and beef farms in Kansas. Scope and economic efficiency were estimated for each individual farm. Average scope efficiency was 0.25, indicating that joint production of crop and beef enterprises on the same farm reduced cost approximately 25%. Scope efficiency was significantly higher for smaller farms. Despite the relatively higher scope efficiency levels, economic efficiency (relative cost efficiency) was significantly lower for smaller farms. Economic efficiency is related to cost control and economies of size, which …
Variation In Performance Of Electronic Cattle Ear Tags And Readers (2006), A.M. Bryant, B.B. Barnhardt, M.P. Epp, S.J. Glaenzer, Dale A. Blasi
Variation In Performance Of Electronic Cattle Ear Tags And Readers (2006), A.M. Bryant, B.B. Barnhardt, M.P. Epp, S.J. Glaenzer, Dale A. Blasi
Kansas Agricultural Experiment Station Research Reports
This study was conducted to evaluate the performance of ISO 11785 radio frequency identification (RFID) cattle ear tags and readers under ideal laboratory conditions. Tag and reader manufacturer identities are masked to prevent unintentional conclusions being drawn about any particular tag or reader at this stage of the U.S. National Animal Identification System (US-NAIS) proposed plan. Eight commercially available tag designs were evaluated, and included the half-duplex and full-duplex air interface technologies. Performance parameters of interest for tags were tensile strength, tampering evidence characteristics, as well as the average reading range. Three fixed-antenna stationary readers were used to determine the …
A Novel Method To Dry Age Beef By Using Vacuum Packaging (2006), M.L. Ahnström, M. Seyfert, Melvin C. Hunt, D.E. Johnson
A Novel Method To Dry Age Beef By Using Vacuum Packaging (2006), M.L. Ahnström, M. Seyfert, Melvin C. Hunt, D.E. Johnson
Kansas Agricultural Experiment Station Research Reports
The traditional dry-aging method for beef was compared with a novel technique of dry aging in a highly moisture-permeable vacuum bag. Paired beef strip loins were cut into four sections and were dry aged traditionally (unpackaged) or packaged in the novel bag for 14 or 21 days. Cooking loss, tenderness, juiciness, and all flavor attributes were similar for the aging methods. Beef dry aged in the bag had less weight loss during aging, less trim loss after 21 days, and lower yeast counts after either aging time, compared with beef dry aged unpackaged. This novel method of dry aging beef …
Color Of Cooked Ground Beef Patties Is Affected By Cooking Rate And Post-Cooking Holding Time (2006), S.M. Ryan, M. Seyfert, Melvin C. Hunt, R.A. Mancini
Color Of Cooked Ground Beef Patties Is Affected By Cooking Rate And Post-Cooking Holding Time (2006), S.M. Ryan, M. Seyfert, Melvin C. Hunt, R.A. Mancini
Kansas Agricultural Experiment Station Research Reports
Two experiments investigated the effects of cooking rate and post-cooking holding time on the internal cooked color of ground beef patties. In Experiment 1, patties were cooked rapidly (1.8ºF/second) or slowly (0.4ºF/second). At temperatures below 180ºF, rapidly cooked patties were redder and appeared less well done than those cooked slowly. All slowly cooked patties appeared well done, even at unsafe final internal temperatures. In Experiment 2, patties were cooked rapidly and held for 1, 3, 6, or 12 minutes after cooking. Increasing the post-cooking holding time to 6 minutes after rapid cooking decreased pinkness and maximized well-done appearance. This allowed …
Comparison Of Corn And Grain Sorghum Dried Distillers Grains As Protein Supplements For Growing Beef Heifers (2006), K.W. Harborth, T.T. Marston, Donald A. Llewellyn
Comparison Of Corn And Grain Sorghum Dried Distillers Grains As Protein Supplements For Growing Beef Heifers (2006), K.W. Harborth, T.T. Marston, Donald A. Llewellyn
Kansas Agricultural Experiment Station Research Reports
An experiment was conducted to determine if corn and grain sorghum dried distillers grains could be effective protein supplements for growing beef replacement heifers. Crossbred heifers (n=77) were individually fed 6 lb/heifer daily (dry matter basis) of supplements containing 20% crude protein. The three supplements compared were: 1) 50% cracked corn, 25% soybean meal, and 25% ground grain sorghum; 2) 50% cracked corn and 50% corn distillers grains with solubles; and 3) 50% cracked corn, 31% sorghum distillers grains with solubles, and 19% ground grain sorghum. Heifers grazed a common native- grass pasture and had free-choice access to smooth broom …
Effects Of Spring Pasture Burning, Pasture Deworming, And Grain Supplementation On Performance Of Stocker Steers Grazing Native Flinthills Pasture (2006), B.B. Barnhardt, J.C. Forcherio, R.R. Scott, Christopher D. Reinhardt, Dale A. Blasi
Effects Of Spring Pasture Burning, Pasture Deworming, And Grain Supplementation On Performance Of Stocker Steers Grazing Native Flinthills Pasture (2006), B.B. Barnhardt, J.C. Forcherio, R.R. Scott, Christopher D. Reinhardt, Dale A. Blasi
Kansas Agricultural Experiment Station Research Reports
A grazing study was conducted using 445 crossbred beef steers (496 lb) to determine the benefits of feeding a grain-based supplementon burned and unburned native pasture, with and without a Safe-Guard (fenbendazole) treatment while on pasture. Treatments consisted of mineral only, mineral with Safe-Guard treatment at day 29, and a supplement based on dry-rolled corn with a Safe-Guard treatment on day 29. All three treatments provided GainPro to the steers. Twelve pastures were used, six that were burned and six that were not burned during the month before the start of the trial. The control pastures were stocked at 272 …
Examining Cost Of Gain In Kansas Feedlots (2006), A. Babcock, R. Jones, Michael R. Langemeier
Examining Cost Of Gain In Kansas Feedlots (2006), A. Babcock, R. Jones, Michael R. Langemeier
Kansas Agricultural Experiment Station Research Reports
This study had three primary objectives: 1) to examine the effects that individual performance and ingredient price factors have on cost of gain; 2) to quantify the annual and/or seasonal trend in cost of gain in Kansas feedlots; and 3) to examine the difference in cost of gain between steers and heifers. For both steers and heifers, corn price was significant and positive, indicating that as the price of corn increases so does cost of gain. The price of hay, which is a feedstuff in the majority of feedlot diets, has a positive, but insignificant, effect on feeding cost of …
Accelerated And “Natural” Production-System Effects On Performance And Carcass Traits, L. Veloso, E. Loe, John A. Unruh
Accelerated And “Natural” Production-System Effects On Performance And Carcass Traits, L. Veloso, E. Loe, John A. Unruh
Kansas Agricultural Experiment Station Research Reports
Sixteen crossbred steers were used to compare performance and carcass characteristics of animals from accelerated and "natural" cattle production systems. Steers in the accelerated group (8 head) were implanted with Component TE-S (120 mg of trenbolone acetate, 24 mg estradiol), and received 200 mg/steer daily of ractopamine-HCl (Optaflexx) during the last 33 days of feeding. Tylan and Rumensin were also fed to the accelerated group. "Natural" steers were not implanted and were not given feed additives. Steers in the accelerated group had improved gain; heavier final weights; heavier carcasses; larger ribeye areas; and less kidney, pelvic, and heart fat. "Natural" …