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1992

Kansas Agricultural Experiment Station Research Reports

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Full-Text Articles in Life Sciences

Rate And Extent Of Losses From Top Spoilage In Pilot-Scale, Horizontal Silos, J.T. Dickerson, K.K. Bolsen, B.E. Brent, C. Lin, John E. Boyer Jan 1992

Rate And Extent Of Losses From Top Spoilage In Pilot-Scale, Horizontal Silos, J.T. Dickerson, K.K. Bolsen, B.E. Brent, C. Lin, John E. Boyer

Kansas Agricultural Experiment Station Research Reports

Corn and forage sorghum silages were stored in pilot-scale silos for 180 days, and dry matter (DM) and organic matter (OM) recoveries and estimated OM recovery were measured at three depths within the top 3 ft. of silage. The unsealed silages deteriorated badly in the top 12 in. Actual DM and OM losses in the top 24 in. were higher in unsealed than sealed silages at each successive storage period (7 to 180 days). The unsealed silages began to deteriorate immediately in the top 12 in. in both crops, and deterioration progressed to the second 12 in. by 90 days …

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Effect Of Supplemental Grain Sorghum And Overseeding With Ladino Clover On Grazing And Subsequent Feedlot Performance Of Steers Early-Intensively Grazed On Acremonium Coenophialum - Infected Tall Fescue Pastures, K.P. Coffey, Joseph L. Moyer, Lyle W. Lomas, F.K. Brazle Jan 1992

Effect Of Supplemental Grain Sorghum And Overseeding With Ladino Clover On Grazing And Subsequent Feedlot Performance Of Steers Early-Intensively Grazed On Acremonium Coenophialum - Infected Tall Fescue Pastures, K.P. Coffey, Joseph L. Moyer, Lyle W. Lomas, F.K. Brazle

Kansas Agricultural Experiment Station Research Reports

Eighty mixed breed steers (avg. wt. 560 lb.) were used to evaluate the effect on grazing gain and subsequent feedlot performance of different management options for steers early-intensively grazing Acremonium coenophialuminfected tall fescue pastures. Steers were allotted to pastures of infected fescue pastures or infected fescue overseeded with ladino clover and received no supplement or were offered grain sorghum at .25% of their body weight. Neither supplementation nor overseeding affected grazing or feedlot performance. However, grain supplementation on overseeded pastures reduced subsequent feedlot feed efficiency (P<.10). These management options did not substantially affect grazing or subsequent feedlot performance by steers early-intensively grazing infected fescue pastures.

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Effect Of Deworming With Ivomec® On Reproductive Performance Of Yearling Beef Heifers, Robert L. Larson, L.R. Corah, M.F. Spire, R.C. Cochran Jan 1992

Effect Of Deworming With Ivomec® On Reproductive Performance Of Yearling Beef Heifers, Robert L. Larson, L.R. Corah, M.F. Spire, R.C. Cochran

Kansas Agricultural Experiment Station Research Reports

To determine the effect of deworming fallborn yearling heifers on reproductive parameters, 78 heifers were allotted to a either Ivomec® or control treatments. The heifers were dewormed in June and October when they were approximately 7 and 11 months old, respectively. Ivomec effectively lowered fecal egg counts from treated heifers compared to controls. In these heifers that were maintained on a marginal plane of nutrition, deworming not only improved weight gains but also hastened onset of puberty and improved conception rate during a 60-day breeding season. The positive effect of Ivomec on these reproductive characteristics could not be explained by …

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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 pharmaceutical inventory …

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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 …

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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.

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Causes Of Diarrhea, Pneumonia, And Abortion In 1991 Cattle Submissions To The Ksu Veterinary Diagnostic Laboratory, R.K. Frank, M.W. Vorhies, M. M. Chengappa Jan 1992

Causes Of Diarrhea, Pneumonia, And Abortion In 1991 Cattle Submissions To The Ksu Veterinary Diagnostic Laboratory, R.K. Frank, M.W. Vorhies, M. M. Chengappa

Kansas Agricultural Experiment Station Research Reports

Causes of diarrhea, pneumonia, and abortion in Kansas cattle submissions to the Kansas State University Veterinary Diagnostic Laboratory during 1991 were summarized. Antimicrobial susceptibility results for Pasteurella haemolytica, Pasteurella multocida, Hemophilus somnus, and Salmonella spp., the common causes of pneumonia and/or diarrhea in cattle with increasing antibiotic resistance patterns, were also summarized. The most commonly diagnosed causes of diarrhea in young calves (under 1 month of age) were coronavirus, Escherichia coli, and Salmonella. The three most common causes of diarrhea in 1 to 18 month-old cattle were BVD virus, coccidia, and Salmonella. Most respiratory submissions were 7- to 18-month-old cattle. …

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Effect Of Long-Acting Penicillin And Levamisole® On Gain And Health Of Stressed Calves, F.K. Brazle Jan 1992

Effect Of Long-Acting Penicillin And Levamisole® On Gain And Health Of Stressed Calves, F.K. Brazle

Kansas Agricultural Experiment Station Research Reports

Two studies were conducted to determine the effect of long-acting penicillin and/or levamisole injected at arrival or levamisole injected on day 1 and/or day 7 on the health and gain of newly received, highly stressed, light weight calves. Levamisole injected at arrival reduced (P<.05) sickness of newly arrived calves during the first 5 days. However, it did not reduce overall sickness during the receiving period. Long-acting penicillin injected at arrival did not reduce sickness, but did improve (P<.05) gain of calves during the growing period. The combination of levamisole and long-acting penicillin or the combination of levamisole on day 1 and day 7 did not reduce morbidity in these highly stressed calves.

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Evaluation Of Inoculant And Npn Silage Additives: A Summary Of 26 Trials And 65 Farm-Scale Silages, K.K. Bolsen, R.N. Sonon, B. Dalke, Ronald V. Pope, Jack G. Riley, A. Laytimi Jan 1992

Evaluation Of Inoculant And Npn Silage Additives: A Summary Of 26 Trials And 65 Farm-Scale Silages, K.K. Bolsen, R.N. Sonon, B. Dalke, Ronald V. Pope, Jack G. Riley, A. Laytimi

Kansas Agricultural Experiment Station Research Reports

Results from 26 trials comparing fermentation, dry matter (DM) recovery, and effects on cattle performance of inoculated or nonprotein nitrogen (NPN)-treated silages vs. controls were summarized using paired t-test analysis. Inoculants consistently improved fermentation efficiency, DM recovery, feed conversion, and gain per ton of crop ensiled in both corn and forage sorghum silages. The use of NPN, particularly urea or anhydrous ammonia, adversely affected fermentation efficiency, DM recovery, avg daily gain, and gain per ton of crop ensiled, particularly for the higher moisture forage sorghums.

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Evaluation Of Inoculant-Treated Corn Silages, K.K. Bolsen, D.G. Tiemann, R.N. Sonon, R.A. Hart, B. Dalke, J.T. Dickerson, C. Lin Jan 1992

Evaluation Of Inoculant-Treated Corn Silages, K.K. Bolsen, D.G. Tiemann, R.N. Sonon, R.A. Hart, B. Dalke, J.T. Dickerson, C. Lin

Kansas Agricultural Experiment Station Research Reports

Whole-plant corn silages treated with either Pioneer 1174® or Biotal® inoculants were preserved more efficiently than control silages. They had slightly higher dry matter (DM) recoveries; more lactic acid; higher lactic to acetic acid ratios; and less acetic acid, ethanol, and ammonia-nitrogen. Laboratory silo results showed that both inoculated silages produced lactic acid faster than control silages during the first 7 days and had more desirable fermentation profiles at the end of 90 days. Applying 5 or 10 times the recommended rate of Biotal inoculant had only a small and nonsignificant effect on rate and efficiency of fermentation. Yearling steers …

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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%).

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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 …

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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 of reconversion …

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Influence Of Protein Source Fed To The Early-Weaned Pig During Phase I (D 0 - 9) On The Responses To Various Protein Sources Fed During Phase Ii (D 9 - 28) (1992), L J. Kats, J A. Hansen, Michael D. Tokach, Jim L. Nelssen, Robert D. Goodband Jan 1992

Influence Of Protein Source Fed To The Early-Weaned Pig During Phase I (D 0 - 9) On The Responses To Various Protein Sources Fed During Phase Ii (D 9 - 28) (1992), L J. Kats, J A. Hansen, Michael D. Tokach, Jim L. Nelssen, Robert D. Goodband

Kansas Agricultural Experiment Station Research Reports

A total of 468 weanling pigs (initially 13.2 lb and 21 d of age) was used in a 28 d growth assay to determine the influence of protein source fed during phase I (d 0 to 9) on the response to various protein sources fed during phase II (d 9 to 28). Phase I diets contained 20% dried whey, 10% lactose, and either 10.3% spray-dried porcine plasma or 15.2% moist-extruded soy protein concentrate and formulated to contain 1.5% lysine. On d 9, pigs were switched to diets containing 10% dried whey and either 3.9% spraydried porcine plasma, 2.5% spray-dried blood …

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Effects Of The Interrelationship Of Porcine Somatotropin Administration And Dietary Phosphorus On Bone Properties In Developing Gilts (1992), T L. Weeden, J A. Hansen, K G. Friesen, B T. Richert, Jim L. Nelssen, Robert D. Goodband Jan 1992

Effects Of The Interrelationship Of Porcine Somatotropin Administration And Dietary Phosphorus On Bone Properties In Developing Gilts (1992), T L. Weeden, J A. Hansen, K G. Friesen, B T. Richert, Jim L. Nelssen, Robert D. Goodband

Kansas Agricultural Experiment Station Research Reports

Seventy-two gilts (initial weight = 127 lb) were used to determine effects of the interrelationship of porcine somatotropin (pST) administration and dietary phosphorus (P) on bone mechanical properties and mineralization in finishing gilts (127 to 235 lb) and for a 35-d postfinishing phase following withdrawal of pST administration. Gilts were injected daily with placebo (control) or 4 mg pST and fed .4, .6, or .8% P in the finishing phase. When each block weight averaged 235 lb, half of the gilts were slaughtered and the first rib, femur, and third and fourth metacarpals were collected. Stress; modulus of elasticity; and …

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Blood Meal Source Influences Starter Pig Performance (1992), L J. Kats, T L. Weeden, Jim L. Nelssen, Robert D. Goodband, Michael D. Tokach Jan 1992

Blood Meal Source Influences Starter Pig Performance (1992), L J. Kats, T L. Weeden, Jim L. Nelssen, Robert D. Goodband, Michael D. Tokach

Kansas Agricultural Experiment Station Research Reports

A total of 144 weanling pigs (initially 14.1 lb and 24 d of age) was used to compare three different blood meal sources in starter diets. The three sources included spray-dried porcine, spray-dried bovine, and flash-dried bovine blood meal. Each diet contained 10% dried whey and 2.5% of one of the three blood meal sources. Diets were formulated to contain 1.25%lysine and .31% methionine. Pigs receiving diets containing either source of spray-dried blood meal had improved average daily gain and feed efficiency during the first 2 weeks of the experiment and the overall trial compared to pigs receiving diets containing …

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Extruded Corn, Sorghum, Wheat, And Barley For Finishing Pigs (1992), B T. Richert, Terry L. Gugle, Robert H. Hines, Joe D. Hancock Jan 1992

Extruded Corn, Sorghum, Wheat, And Barley For Finishing Pigs (1992), B T. Richert, Terry L. Gugle, Robert H. Hines, Joe D. Hancock

Kansas Agricultural Experiment Station Research Reports

Eighty barrows (113.7 lb average initial weight) were used to determine the effects of extruding corn, sorghum, wheat, and barley on growth performance, carcass merit, nutrient digestibility, and changes in stomach morphology of finishing pigs. Treatments were grain source (com, sorghum, wheat, and barley) and processing procedure (grinding vs extrusion) arranged as a 4 x 2 factorial. Grinding was in a Jacobson hammermill and extrusion was in an Insta-Pro extruder. Pigs fed com had improved average daily gain (ADG), feed/gain (F/G), DM digestibility, and N digestibility compared to the other grain sources. Diets with barley supported the poorest growth performance …

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Optimum Level Of Spray-Dried Blood Meal In Phase Ii Diet (1992), L J. Kats, Jim L. Nelssen, Michael D. Tokach, Robert D. Goodband Jan 1992

Optimum Level Of Spray-Dried Blood Meal In Phase Ii Diet (1992), L J. Kats, Jim L. Nelssen, Michael D. Tokach, Robert D. Goodband

Kansas Agricultural Experiment Station Research Reports

A total of 744 pigs (initially 12.8 lb and 22 d of age) was used in a 28 d trial to determine the effects of increasing levels of blood meal in the phase II (d 7 to 28) diet. Pigs were allotted by sex and weight and placed in pens containing 13 to 14 pigs each. A common phase I diet was fed for the first 7 days postweaning. The phase I diet contained 37.5% dried whey and 7.5% porcine plasma and was formulated to contain 1.5% lysine. After the phase I period, pigs were assigned to one of six …

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Reduction Of Corn Particle Size In Lactation Diets Improves Sow And Litter Performance (1992), K J. Wondra, G A. Kennedy, Robert H. Hines, Joe D. Hancock, Keith C. Behnke Jan 1992

Reduction Of Corn Particle Size In Lactation Diets Improves Sow And Litter Performance (1992), K J. Wondra, G A. Kennedy, Robert H. Hines, Joe D. Hancock, Keith C. Behnke

Kansas Agricultural Experiment Station Research Reports

One hundred primiparous sows were used to determine the effects of corn particle size in lactation diets on sow and litter performance. Sows were fed com-soybean mealbased diet with the com ground to 1,200, 900, 600, or 400 JLm. Particle size of corn had no influence on sow weight or backfat loss, or piglet survivability. However, feed intake and digestibilities of DM, N, and GE were increased (6, 5, 7, and 7%, respectively) as particle size was reduced from 1,200 to 400 JLm. The combination of increased feed intake and improved digestibilities resulted in increased intake of digestible nutrients. DE …

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Effects Of The Interrelationship Between Dietary Lysine And Litter Size On Sow And Litter Performance (1992), J L. Laurin, R D. Anderson, Jim L. Nelssen, Robert D. Goodband, Michael D. Tokach Jan 1992

Effects Of The Interrelationship Between Dietary Lysine And Litter Size On Sow And Litter Performance (1992), J L. Laurin, R D. Anderson, Jim L. Nelssen, Robert D. Goodband, Michael D. Tokach

Kansas Agricultural Experiment Station Research Reports

One hundred and forty-three lactating primiparous sows were used in a study to determine the influence of four different litter sizes on the dietary lysine requirement as measured by sow and litter performance. At farrowing, sows were randomly assigned to one of three corn soybean meal diets (.67, .94, or 1.22 % lysine) and one of four litter sizes (8, 9, 10, or 11 pigs). Sows were fed 7.7, 9.9, and 12.1 IbId of their respective diet for the first, second, and third week of lactation. This provided an average daily lysine intake of 30.1, 42.2, or 54.8 gld throughout …

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Evaluation Of Roasted Soybeans For Dairy Calves (1992), P.V. Reddy, J.L Morrill, L.S. Bates Jan 1992

Evaluation Of Roasted Soybeans For Dairy Calves (1992), P.V. Reddy, J.L Morrill, L.S. Bates

Kansas Agricultural Experiment Station Research Reports

Diets containing soybeans roasted at different temperatures were fed to calves to investigate effects on growth and feed consumption. A growth trial was conducted using 84 Holstein calves from birth to 8 wk of age. The diets were formulated to contain 18% CP using soybeans roasted at 270 degrees F, 295 degrees F, or 325 degrees F. The overall feed consumption was greater for calves fed the diet containing beans roasted at either 270 or 295 degrees F than those fed the diet containing 325 degrees F beans. A similar trend was observed in weekly feed consumption. Gains were higher …

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Leukocyte Function In Vitro After Adding Vitamins A, E, And Beta-Carotene (1992), S.D. Eicher, J.L. Morrill, Frank Blecha Jan 1992

Leukocyte Function In Vitro After Adding Vitamins A, E, And Beta-Carotene (1992), S.D. Eicher, J.L. Morrill, Frank Blecha

Kansas Agricultural Experiment Station Research Reports

Blood neutrophils and pulmonary alveolar macrophages isolated from calves at 3 and 6 wk of age were cultured in medium without added vitamins or supplemented with vitamin A, vitamin E, vitamin A and vitamin E, or ßcarotene and vitamin E. Macrophage bactericidal activity improved with A-E supplementation compared to ß-carotene-E supplementation at wk 3. Neutrophil bactericidal activity decreased with all vitamin E treatments at wk 3 and with vitamins E and A-E at wk 6. Neutrophil phagocytosis improved at wk 3 with A, E, and A-E supplementations. The chemotactic index improved at wk 3 with ß-carotene- E compared to vitamin …

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Somatic Cell Count Inversely Related To Potential Profits In Dairying (1992), James R. Dunham Jan 1992

Somatic Cell Count Inversely Related To Potential Profits In Dairying (1992), James R. Dunham

Kansas Agricultural Experiment Station Research Reports

Somatic Cell Count (SCC) affects productivity of a dairy herd and, thus, potential profit. Almost all SCC problems can be solved by management. The DHIA SCC program is very useful for evaluating the situation in a dairy herd to solve such problems.; Dairy Day, 1992, Kansas State University, Manhattan, KS, 1992;

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Effect Of Yearly Milk Production On Average Days Open (1992), Edward P. Call Jan 1992

Effect Of Yearly Milk Production On Average Days Open (1992), Edward P. Call

Kansas Agricultural Experiment Station Research Reports

Although there is a genetic antagonism between yearly production per cow and reproduction, analysis of Kansas Holstein herds suggests that managers of higher producing herds overcome this inverse relationship. Higher producing herds have fewer cows open at any given time, and those cows that are open average fewer days since last freshening. When open cows are categorized by days open, higher producing herds have fewer cows open more than 60 days, and especially fewer cows open more than 120 days.; Dairy Day, 1992, Kansas State University, Manhattan, KS, 1992;

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Ovarian Follicular Waves And Secretion Of Follicle-Stimulating Hormone After Administration Of Gnrh At Estrus (1992), J.R. Pursley, Jeffrey S. Stevenson Jan 1992

Ovarian Follicular Waves And Secretion Of Follicle-Stimulating Hormone After Administration Of Gnrh At Estrus (1992), J.R. Pursley, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

An experiment was conducted to examine the effects of GnRH on the secretion of FSH, LH, estradiol, and progesterone in serum and changes in ovarian structures. Dairy cows were assigned randomly to receive either 100 μg of GnRH or saline 12 hr after estrus (day 0) was detected. Blood was collected daily to assess changes in serum estradiol and progesterone and every 12 min for 8 hr on days 8 and 15 after estrus to assess concentrations of FSH and LH. Diameter and number of follicles were determined daily by real-time ultrasonography. Two patterns of follicular development were observed. The …

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Induction Of Estrus In Thyroidectomized-Ovariectomized, Nonlactating, Holstein Cows (1992), R.E. Stewart, M.O. Mee, I. Rettmer, Jeffrey S. Stevenson Jan 1992

Induction Of Estrus In Thyroidectomized-Ovariectomized, Nonlactating, Holstein Cows (1992), R.E. Stewart, M.O. Mee, I. Rettmer, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Low thyroid activity (hypothyroidism) has been reported to decrease sexual behavior associated with reproduction in several species. Using estradiol benzoate (EB) and progesterone (P ), we attempted to induce 4 estrus in hypothyroid cows. Thyroid glands (thyroidectomy) and ovaries (ovariectomy) were removed surgically from nonlactating and nonpregnant Holstein cows that were culled from the Kansas State University dairy herd. Eight cows were thyroidectomized and ovariectomized (THYOVEX) and another four cows were ovariectomized only (OVEX). Starting 9 hr after injection of EB, cows were continuously observed for estrus for 36 hr. Frequencies of mounting activity and standing behavior were recorded for …

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Administering A Gnrh Agonist (Receptal) After Insemination Fails To Improve Pregnancy Rates At First Service (1992), I. Rettmer, R.E. Stewart, Jeffrey S. Stevenson Jan 1992

Administering A Gnrh Agonist (Receptal) After Insemination Fails To Improve Pregnancy Rates At First Service (1992), I. Rettmer, R.E. Stewart, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Two experiments were performed to determine the influence of administering a highly potent agonist of gonadotropin-releasing hormone (Receptal) on various reproductive characteristics in dairy cows. In Experiment 1, lactating Holstein cows were treated with either saline (n = 51) or 8 μg of receptal (n = 50) on d 11 to 14 after estrus (d 0) and first service. Peak concentrations of LH, FSH, and progesterone, but not estradiol-17b, in blood serum were increased during 6 to 12 h after injection of Receptal. Pregnancy rates were unaffected by treatment. Concentrations of progesterone in blood serum were increased in nonpregnant and …

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Fish Meal As A Protein Source For Holstein Steer Calves (1992), J.L. Morrill, J.F. Laster, J.M. Morrill, A.M. Feyerherm Jan 1992

Fish Meal As A Protein Source For Holstein Steer Calves (1992), J.L. Morrill, J.F. Laster, J.M. Morrill, A.M. Feyerherm

Kansas Agricultural Experiment Station Research Reports

Holstein steer calves (n = 96) were on experiment from 8 to 18 wk of age. Control calves were fed a diet in which all supplemental protein was from soybean meal; in the experimental diet, part of the soybean meal was replaced by fish meal. Both feeds were readily consumed, and consumption did not differ between treatments. Gains of calves fed fish meal were greater (P = .10) during the first 8 wk of the experiment; however, over the entire experiment, the difference was not significant. Overall results suggest that fish meal may improve weight gains and feed efficiency of …

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Waste Management In The Production Dairy Industry (1992), C. Fulhage Jan 1992

Waste Management In The Production Dairy Industry (1992), C. Fulhage

Kansas Agricultural Experiment Station Research Reports

The impact of environmental regulation on livestock production enterprises is, inevitably, an increase in production costs. Producers should recognize that these are the costs of doing business and will probably have to be incurred by all producers who stay in business and remain viable. With proper input to the regulation process and implementation of practical and effective methods of manure management, most producers should be able to maintain viable enterprises.; Dairy Day, 1992, Kansas State University, Manhattan, KS, 1992;

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The Effects Of Slow-Release Copper Boluses On Cow Reproductive Performance And Calf Growth, J.D. Arthington, Robert L. Larson, L.R. Corah Jan 1992

The Effects Of Slow-Release Copper Boluses On Cow Reproductive Performance And Calf Growth, J.D. Arthington, Robert L. Larson, L.R. Corah

Kansas Agricultural Experiment Station Research Reports

Two Kansas cow/calf herds known to be copper deficient were utilized to examine the effect of slow-release copper boluses. In herd I, 34 spring-calving cows and calves were divided into a treated and control group at 3-4 months following calving. In herd II, 1106 fall-calving cows and 172 calves were divided into a treated and control group at 3-4 months following calving. In both herds, cow liver and serum samples were collected and assayed for copper and iron. Cows in herd II were also examined for various reproductive parameters. Calf ADG was monitored over a 42-day treatment period in herd …

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