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Cattlemen's Day

1992

Articles 31 - 45 of 45

Full-Text Articles in Life Sciences

Synchronization Of Estrus In Yearling Beef Heifers With The Mga®/Prostaglandin F2Α System: Iii. Timed Insemination After 72 Hours Of Estrous Detection, Robert L. Larson, L.R. Corah Jan 1992

Synchronization Of Estrus In Yearling Beef Heifers With The Mga®/Prostaglandin F2Α System: Iii. Timed Insemination After 72 Hours Of Estrous Detection, Robert L. Larson, L.R. Corah

Kansas Agricultural Experiment Station Research Reports

The percentage of heifers conceiving to artificial insemination (AI) following melengestrol acetate/prostaglandin F2"(MGA®/PG) estrous synchronization can be increased by mass insemination of all heifers not showing estrus by 72 h after PG. Inseminating at 12 h after estrus detection all heifers showing estrus within 72 h after PG; then inseminating those not detected in estrus by 72 h after PG as a group increased the proportion of heifers conceiving to AI by 10.8%.


Influence Of Source And Amount Of Dietary Protein On The Performance And Reproductive Function Of First-Calf Heifers, W.C. Rusche, R.C. Cochran, L.R. Corah, Jeffrey S. Stevenson, D.L. Harmon Jan 1992

Influence Of Source And Amount Of Dietary Protein On The Performance And Reproductive Function Of First-Calf Heifers, W.C. Rusche, R.C. Cochran, L.R. Corah, Jeffrey S. Stevenson, D.L. Harmon

Kansas Agricultural Experiment Station Research Reports

Increasing the amount of dietary protein above the NRC requirement increased weight gain of nursing first-calf heifers. Feeding a protein source with higher ruminal escape potential and increasing protein in the diet both improved calf gains. No significant changes in reproductive function or milk production were observed from either source or amount of dietary protein.


Factors Affecting Variability In Feedlot Steer Profits, Michael R. Langemeier, J. Mintert, Ted C. Schroeder Jan 1992

Factors Affecting Variability In Feedlot Steer Profits, Michael R. Langemeier, J. Mintert, Ted C. Schroeder

Kansas Agricultural Experiment Station Research Reports

This study examined the relative importance of price and animal performance factors on cattle finishing profitability. Using data from a single feedlot, sale prices, feeder prices, and corn prices explained 90 to 95% of the variation in steer profits. About 50% of the variability was explained by fed cattle prices alone. Because sale, feeder, and corn prices have a large impact on profits per head, cattle feeders should attempt to manage the risks associated with these three factors.


Record-Keeping Systems For Beef Safety And Feedlot Health, C.D. Cranwell, D.D. Simms Jan 1992

Record-Keeping Systems For Beef Safety And Feedlot Health, C.D. Cranwell, D.D. Simms

Kansas Agricultural Experiment Station Research Reports

Three hundred nine feedlots were mailed questionnaires to ascertain the types of recordkeeping systems currently being used to monitor health programs and FDA-specified treatment withdrawal times. Microcomputer systems were of special interest. Approximately one third of the feedlots responded. A majority with a one-time feeding capacity of more than 10,000 head were using a microcomputer record-keeping system, whereas most of those with fewer than 10,000 head used a manual, paper-based system. Those feedlots using computerized record-keeping systems had purchased their software package from one of five companies. Managers felt these software packages were adequate for billing customers, monitoring ...


Performance Of Rat-Tail Calves, R.R. Schalles, Douglas A. Powell, L.V. Cundiff, J.B. Glaze Jan 1992

Performance Of Rat-Tail Calves, R.R. Schalles, Douglas A. Powell, L.V. Cundiff, J.B. Glaze

Kansas Agricultural Experiment Station Research Reports

The rat-tail syndrome occurs in a small percentage of calves produced by crossing Continental breeds of cattle with Angus or Holstein. These calves are characterized by short, curly, malformed, sometimes sparse body hair and an abnormal tail switch. The performance of 43 rat-tail calves was compared to that of 570 normal calves of the same breeding and contemporary groups. All rat-tail calves were sired by Simmental bulls and were from cows with various percentages of Angus breeding. As the percentage of Angus increased, the frequency of rat-tail calves increased. The rat-tail condition had no effect on birth weight, weaning weight ...


Losses From Top Spoilage In Horizontal Silos In Western Kansas, J.T. Dickerson, G. Ashbell, K.K. Bolsen, B.E. Brent, L. Pfaff, Y. Niwa Jan 1992

Losses From Top Spoilage In Horizontal Silos In Western Kansas, J.T. Dickerson, G. Ashbell, K.K. Bolsen, B.E. Brent, L. Pfaff, Y. Niwa

Kansas Agricultural Experiment Station Research Reports

The top 3 ft. of silage from each of 30 horizontal silos in western Kansas was sampled at three locations across the width of the silo for 2 consecutive years (1990 and 1991). Ninety-five percent of the silages were either corn or forage sorghum, and only 22 percent of the silos were sealed with polyethylene sheeting. Losses of organic matter (OM) from spoilage were estimated by using ash content as an internal marker. Sealing silos dramatically reduced the estimated spoilage losses in the top 3 ft. All silages had greater estimated spoilage losses in the top 18 in. in 1991 ...


Effects Of Estradiol Or An Estradiol-Trenbolone Acetate Reimplant Scheme And Time On Feed On Performance And Carcass Traits Of Finishing Steers, Robert T. Brandt Jr., Michael E. Dikeman, Sally L. Stroda Jan 1992

Effects Of Estradiol Or An Estradiol-Trenbolone Acetate Reimplant Scheme And Time On Feed On Performance And Carcass Traits Of Finishing Steers, Robert T. Brandt Jr., Michael E. Dikeman, Sally L. Stroda

Kansas Agricultural Experiment Station Research Reports

Two hundred eighty-eight predominantly British and British crossbred steers (702 lb) were used in a 2x3 factorially arranged experiment. Main effect factors were reimplant scheme [estradiol (E2) vs estradiol plus trenbolone acetate (E2 + TBA)] and time on feed (111, 125 or 139 days). The initial slaughter occurred when 65 to 70% of all steers were estimated to grade low Choice. No interactions occurred for any variable measured. Reimplanting 57 days after the initial implant with E2 + TBA increased overall daily gain 6.9% (P<.003) and feed efficiency 4.9% (P<.005). Feeding steers for an additional 14 or 28 days resulted in linear decreases in overall daily gain (P<.005) and feed efficiency (P<.0004). Reimplanting with E2 + TBA increased (P<.001) carcass weight but did not reduce marbling score or percent Choice carcasses. Feeding steers for an additional 14 or 28 days resulted in linear increases (P<.0001) in hot carcass weight, ribeye area, adjusted backfat (P<.004), and skeletal maturity (P<.0005). Additional days on feed increased dressing percentage (P<.002) and marbling score (P<.05) curvilinearly and tended (P=.25) to increase the percentage of carcasses grading Choice and Prime. Incidence of dark cutters was higher (P<.05) for E2 + TBA carcasses, and was very high at the first slaughter date (54 days after reimplantation). Although feeding for an additional 14 or 28 days can result in heavier live and carcass weights, higher dressing percentage, and increased marbling, poor efficiency of gain may create negative feeding margins.


A Comparison Of Beef Flavor Intensity Among Major Muscles, C.F. Carmack, J.R. Schwenke, Curtis L. Kastner, Michael E. Dikeman Jan 1992

A Comparison Of Beef Flavor Intensity Among Major Muscles, C.F. Carmack, J.R. Schwenke, Curtis L. Kastner, Michael E. Dikeman

Kansas Agricultural Experiment Station Research Reports

Twelve muscles from eight Select/Choice grade steers were evaluated for beef flavor intensity, tenderness, and juiciness. Sample steaks were cut, and evaluation was performed by a five-member professional panel. The biceps femoris ranked highest in beef flavor intensity but was not different (P>.05) from the psoas major, gluteus medius, semimembranosus, and triceps brachii (scores of 7.8, 7.5, 7.4, 7.4, and 7.3, respectively). The rectus femoris, longissimus lumborum, serratus ventralis, infraspinatus, semitendinosus, deep pectoral, and supraspinatus were less intense in beef flavor (7.1, 7.1, 7.0, 6.8, 6.8, 6.7 ...


Influence Of Level Of Supplemental Alfalfa Hay On The Performance Of Beef Cows Grazing Winter Bluestem Range, E.S. Vanzant, R.C. Cochran Jan 1992

Influence Of Level Of Supplemental Alfalfa Hay On The Performance Of Beef Cows Grazing Winter Bluestem Range, E.S. Vanzant, R.C. Cochran

Kansas Agricultural Experiment Station Research Reports

One hundred thirteen pregnant Hereford x Angus cows were used to study the effect of increasing levels of supplemental alfalfa hay on performance when grazing winter bluestem range. Although no differences were observed in reproductive performance, increasing the amount supplemental alfalfa from approximately .5% up to 1.0% of body weight resulted in increased weight gain and reduced condition loss in cows and increased weaning weight in calves. However, time spent grazing was significantly decreased in those groups receiving larger amounts of supplemental alfalfa.


Heritabilities And Genetic Correlations Of Ultrasound-Measured Ribeye Area With Other Performance Traits In Brangus Cattle, M.Z. Johnson, R.R. Schalles, W. Olson, Michael E. Dikeman Jan 1992

Heritabilities And Genetic Correlations Of Ultrasound-Measured Ribeye Area With Other Performance Traits In Brangus Cattle, M.Z. Johnson, R.R. Schalles, W. Olson, Michael E. Dikeman

Kansas Agricultural Experiment Station Research Reports

Heritabilities and genetic correlations for ultrasound-measured ribeye area and fat thickness, as well as growth traits and scrotal circumference, were determined using performance records of 1613 Brangus calves born from 1987 to 1990. Moderate heritabilities of .39 for weaning and .40 for yearling ultrasound- measured ribeye area indicate that selection to change these traits should be effective. The positive, and generally large, genetic correlations between ultrasound-measured ribeye areas and growth traits indicate that genetic change of these traits can be made in tandem. The low heritability (.14) of fat thickness, the small amount of fat, and the lack of variation ...


Comparison Of Feedlot And Carcass Characteristics Of Angus, Hereford, Brahman, Charolais, And Gelbvieh Crossbred Steers, D.T. Hickok, R.R. Schalles, D.E. Franke, Michael E. Dikeman Jan 1992

Comparison Of Feedlot And Carcass Characteristics Of Angus, Hereford, Brahman, Charolais, And Gelbvieh Crossbred Steers, D.T. Hickok, R.R. Schalles, D.E. Franke, Michael E. Dikeman

Kansas Agricultural Experiment Station Research Reports

Feedlot performance of 207 steers with various percentages of Angus, Hereford, Charolais, Brahman, and Gelbvieh breeding were compared at a constant 1) days fed, 2) adjusted carcass backfat, and 3) slaughter weight. As the percentage of Angus, Hereford, or Brahman increased, growth rate decreased, whereas increasing the percentage of Charolais increased growth rate. Increasing the percentage of Gelbvieh increased weaning weight but had little effect on post-weaning gains. Increasing percentage of Charolais increased feed conversion efficiency, whereas the other breeds were similar, except that at a constant slaughter weight, greater percentage of Hereford improved feed conversion efficiency. Increasing the percentage ...


Effects Of Biomate® Inoculant And Dextrose On The Fermentation Of Alfalfa Silages, C. Lin, K.K. Bolsen, J.E. Bradford, B.E. Brent, A.M. Feyerherm, W.R. Aimutis Jan 1992

Effects Of Biomate® Inoculant And Dextrose On The Fermentation Of Alfalfa Silages, C. Lin, K.K. Bolsen, J.E. Bradford, B.E. Brent, A.M. Feyerherm, W.R. Aimutis

Kansas Agricultural Experiment Station Research Reports

This study documented once again that ensiling alfalfa is difficult and unpredictable. Adding 2% dextrose or Biomate® inoculant alone or in combination had little influence on the ensiling process but did improve fermentation efficiency somewhat. The pre-ensiling characteristics (i.e., dry matter (DM) and water soluble carbohydrate (WSC) values, buffering capacity, and epiphytic microflora) at the different cuttings and stages of maturity undoubtedly influenced the effectiveness of the two additives. Apparently, alfalfa often has too little WSC and too much buffering capacity to produce adequately preserved silage, especially when ensiled at a low DM content (less than 30 to 34%).


Interrelationship Between Copper And Bovine Health, Robert L. Larson, J.D. Arthington, L.R. Corah Jan 1992

Interrelationship Between Copper And Bovine Health, Robert L. Larson, J.D. Arthington, L.R. Corah

Kansas Agricultural Experiment Station Research Reports

Trace mineral nutrition is important to production efficiency and animal health. Trace mineral imbalances may be the roots of many diagnosed or undiagnosed problems in a herd. The low cost of a complete mineral analysis when compared to production losses encourages its use in the evaluation of any bovine herd in which trace mineral imbalances are suspected. A systematic gathering of information on mineral intake, antagonist intake, and serum and tissue values is necessary in order to make a diagnosis and a rational treatment decision. It is important to understand the complex interactions between minerals so that supplementation with one ...


Effects Of Source And Level Of Energy Or Protein Supplementation On Nitrate Toxicity In Cattle, M.W. Smith, M.R. Blanding, L.R. Corah, Dale A. Blasi Jan 1992

Effects Of Source And Level Of Energy Or Protein Supplementation On Nitrate Toxicity In Cattle, M.W. Smith, M.R. Blanding, L.R. Corah, Dale A. Blasi

Kansas Agricultural Experiment Station Research Reports

Two experiments were conducted to investigate whether level or source of energy and protein supplementation would reduce the incidence or severity of clinical toxicity in cattle fed forages high in nitrate (NO3). Heavily fertilized sudan hay with 40,000 to 50,000 ppm NO3 was fed in both experiments. The percentage of total blood hemoglobin converted to methemoglobin by nitrate was used to compare treatment effectiveness. Energy supplementation at levels tested in Exp. 1 had no effect on methemoglobin concentration. In Exp. 2, all protein sources (wheat midds, urea, soybean meal) reduced the maximum methemoglobin levels and increased the rate ...


Epiphytic Lactic Acid Bacteria Succession During The Pre-Ensiling And Ensiling Periods Of Alfalfa And Corn, Chunjian Lin, B.E. Brent, K.K. Bolsen, Daniel Y.C. Fung Jan 1992

Epiphytic Lactic Acid Bacteria Succession During The Pre-Ensiling And Ensiling Periods Of Alfalfa And Corn, Chunjian Lin, B.E. Brent, K.K. Bolsen, Daniel Y.C. Fung

Kansas Agricultural Experiment Station Research Reports

Twenty three species and 306 strains of epiphytic lactic acid bacteria (LAB) were found for two cuttings of alfalfa, each harvested at three stages of maturity, and three whole-plant corn hybrids. Epiphytic LAB counts were low and variable on the standing crops, particularly on alfalfa. Wilting increased LAB numbers slightly for alfalfa, but the chopping process increased counts dramatically for both crops. Lactobacillus plantarum, Pediococcus pentosaceus, Enterococcus faecium, and E. faecalis were predominant on both standing crops. The changes in LAB caused by wilting or chopping were mainly proportional changes in the four dominant species. Once the crops were ensiled ...