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Journal

Kansas Agricultural Experiment Station Research Reports

Dairy Science

2001

Keyword

Articles 1 - 15 of 15

Full-Text Articles in Life Sciences

Presynchronization Of Estrous Cycles In Dairy Cows Before Ovsynch + Cidr And Resynchronization Of Repeat Estrus Using The Cidr, S.Z. El-Zarkouny, J.A. Cartmill, A.M. Richardson, M.A. Medina-Britos Jan 2001

Presynchronization Of Estrous Cycles In Dairy Cows Before Ovsynch + Cidr And Resynchronization Of Repeat Estrus Using The Cidr, S.Z. El-Zarkouny, J.A. Cartmill, A.M. Richardson, M.A. Medina-Britos

Kansas Agricultural Experiment Station Research Reports

Postpartum anestrus is one of the major limitations to achieving acceptable pregnancy rates. The Ovsynch protocol is an excellent tool to improve reproductive efficiency of dairy cows because it can induce estrous cycles in anestrous cows. In the first experiment, administering two PGF2" injections to lactating dairy cows 14 days apart with the second injection given 12 days before the Ovsynch protocol increased (P<0.05) pregnancy rate by 10 percentage points in cycling and noncycling cows. Inserting a progesterone-releasing insert (CIDR) for 7 days during the Ovsynch protocol did not further increase pregnancy rates. In a second experiment, a resynchronization treatment consisting of a used CIDR inserted for 7 days from days 13 to 20 after insemination increased (P<0.05) embryo survival from day 30 to 58 by 11 percentage points but failed to increase overall rate of return to estrus and conception rate at the second AI (first eligible estrus after first AI).; Dairy Day, 2001, Kansas State University, Manhattan, KS, 2001;

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Drinking Water Requirements For Lactating Dairy Cows (2001), John F. Smith, Joseph P. Harner, S.R. Defrain, Michael J. Brouk Jan 2001

Drinking Water Requirements For Lactating Dairy Cows (2001), John F. Smith, Joseph P. Harner, S.R. Defrain, Michael J. Brouk

Kansas Agricultural Experiment Station Research Reports

A study to determine the amount and location of water consumption in dairy freestall barns located in northeastern Kansas was conducted during the summer of 2000. Three farms, two Holstein farms with either 2-row or 4-row freestall barns and one Jersey farm with 4-row freestall buildings, were used. Summer water usage averaged 30 to 40 gallons per Holstein cow/day and 20 to 40 gallons/cow/day for Jersey cows depending on age and stage of lactation. The farms with Holstein cows had a water usage ratio of 4 to 4.5 lb of water per lb of milk produced and Jersey cows required …

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Bacterial Degradation Of Milk Components Is Affected By Storage Temperature And Time (2001), S. Zimmerman, I.J. Jeon, L. Mcvay, E. Ferdinand Jan 2001

Bacterial Degradation Of Milk Components Is Affected By Storage Temperature And Time (2001), S. Zimmerman, I.J. Jeon, L. Mcvay, E. Ferdinand

Kansas Agricultural Experiment Station Research Reports

Raw milk is an excellent medium for bacterial growth. The objective of this study was to evaluate the number of microbes and component degradation in raw milk. Milk fat content did not affect bacteria counts. As storage temperature or time increased, greater numbers of bacteria were present. In this study, milk protein was degraded preferentially over lactose or milk fat. As the milk storage temperature increased from 39 to 45°F, protein degradation became more pronounced. Milk fat remained relatively stable, though some degradation products were observed, especially after 4 days of storage at 39°F. Both milk fat and protein degradation …

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Effect Of Fan Placement On Milk Production And Dry Matter Intake Of Lactating Dairy Cows Housed In A 4-Row Freestall Barn (2001), John F. Smith, Joseph P. Harner, S.E. Defrain, Michael J. Brouk Jan 2001

Effect Of Fan Placement On Milk Production And Dry Matter Intake Of Lactating Dairy Cows Housed In A 4-Row Freestall Barn (2001), John F. Smith, Joseph P. Harner, S.E. Defrain, Michael J. Brouk

Kansas Agricultural Experiment Station Research Reports

Heat stress reduces milk production, feed intake, and reproductive efficiency each summer in Kansas. Without heat abatement procedures, milk production may decline 20- 30% during the summer months. Research has shown that supplemental fan cooling in combination with low pressure feedline sprinklers can reduce the effects of heat stress on milk production and feed intake. One critical issue in heat stress abatement is the location of fans in a 4-row freestall barn. Research conducted during the summer of 2000 on a northeast Kansas dairy found that locating fans over both the feedline and head-to-head freestalls increased milk production 5.8 lb/cow/d …

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Effects Of A Biological Additive And Sealing Technique On The Aerobic Stability Of Whole-Plant Corn Silage (2001), M.E. Uriarte, K.K. Bolson, Ronald V. Pope Jan 2001

Effects Of A Biological Additive And Sealing Technique On The Aerobic Stability Of Whole-Plant Corn Silage (2001), M.E. Uriarte, K.K. Bolson, Ronald V. Pope

Kansas Agricultural Experiment Station Research Reports

The objectives of this whole-plant corn study were to determine the effects of a biological additive and sealing technique on yeast and mold populations; and to examine the relationship between the microbial and chemical changes in the silages during exposure to air. Whole-plant corn was harvested at 80% milkline (36% DM), and ensiled at a density of 43 lb of fresh matter/ft3. One-half of the pre-ensiled forage was treated with a biological additive (A), which contained a mixture of bacteria and enzymes (supplied by Alltech, Inc., Nicholasville, KY); the other one-half of the pre-ensiled forage was the untreated control (C). …

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Changes In Rumen Capacity Of Dairy Cows During The Periparturient Period (2001), A.F. Park, J.M. Defrain, Evan C. Titgemeyer, E.E. Ferdinand Jan 2001

Changes In Rumen Capacity Of Dairy Cows During The Periparturient Period (2001), A.F. Park, J.M. Defrain, Evan C. Titgemeyer, E.E. Ferdinand

Kansas Agricultural Experiment Station Research Reports

Four-ruminally fistulated, multiparous, pregnant Holstein cows were studied to characterize ruminal adaptations during the transition from gestation to lactation. Cows were fed typical far-off and close-up diets, a late lactation diet containing wet corn gluten feed (20% DM), and an alfalfa hay, corn silage based early lactation diet. Ruminal measurements were obtained 72 (late lactation), 51 (far-off dry), 23 and 9 (close-up dry) days before expected parturition and 6, 20, and 34 days postpartum. Measurements included total fill, dry matter fill, fluid fill, and water-holding capacity of the rumen. Dry matter intake and milk production data were collected daily and …

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Fertility After Synchronization Of Estrus In Dairy Heifers Using Gnrh, Pgf2Α, And Progesterone (Cidr) (2001), A.M. Richardson, B.A. Hensley, Jeffrey S. Stevenson Jan 2001

Fertility After Synchronization Of Estrus In Dairy Heifers Using Gnrh, Pgf2Α, And Progesterone (Cidr) (2001), A.M. Richardson, B.A. Hensley, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Our objective was to determine fertility of heifers after synchronization of estrus using PGF2", preceded by progesterone, GnRH, or both. Dairy heifers (n = 246) were assigned randomly to three treatments: 1) 50 :g of GnRH given 6 d before 25 mg of PGF2 (d "“1) plus a used intravaginal progesteronereleasing insert (CIDR-B; d "“7 to 0; CIDR+GnRH); 2) same as CIDR+GnRH without the GnRH (CIDR); and 3) same as CIDR+GnRH without the used CIDR (GnRH). All heifers were fitted with Heat- Watch® patches and characteristics of estrus examined before AI included duration of estrus, number of standing events, and …

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Impact Of Milk Production And Important Management Factors On The Process Of Dry-Off In Lactating Dairy Cows (2001), R.T. Dingwell, K.E. Leslie, J.M. Sargeant, Y.H. Schukken Jan 2001

Impact Of Milk Production And Important Management Factors On The Process Of Dry-Off In Lactating Dairy Cows (2001), R.T. Dingwell, K.E. Leslie, J.M. Sargeant, Y.H. Schukken

Kansas Agricultural Experiment Station Research Reports

A study of 250 cows located in Canada and the United States revealed the rate of new mammary infections was 9.9% during the dry period. Average milk production on the day prior to dry-off was 13.2 ± 7.2 kg. The odds of a cow developing a new infection was three times greater if the cow was producing more than 5 kg of milk. After 6 weeks of the dry period, 25% of the teats still remained open. This research will serve as the foundation to investigate and implement management strategies prior to dry-off that might improve the overall udder health …

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Management Of Natural Service Bulls On Large Dairies (2001), P.J. Chenoweth, John F. Smith Jan 2001

Management Of Natural Service Bulls On Large Dairies (2001), P.J. Chenoweth, John F. Smith

Kansas Agricultural Experiment Station Research Reports

Natural service (NS) bulls are widely used on large dairy farms despite the wellproven genetic progress achievable through AI. Producers may choose to use NS bulls for a variety of reasons that are discussed below. In this presentation, problems encountered with the use of NS bulls on a large dairy in Kansas are described in relation to reduced reproductive performance on that dairy. Lameness in bulls was considered to be a major contributing factor to reduced herd reproductive performance, with seminal vesiculitis also possibly playing a role. Possible contributing factors for the occurrence of these problems in the bull population …

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Extralabel Mastitis Therapy: What Does It Mean? (2001), J.R. Roberson Jan 2001

Extralabel Mastitis Therapy: What Does It Mean? (2001), J.R. Roberson

Kansas Agricultural Experiment Station Research Reports

Extra-label drug use (ELDU) is needed to provide optimal therapy for ill dairy cattle. Proper ELDU requires cooperation and compliance between the veterinarian and producer to ensure that proper drug withdrawal times are observed.; Dairy Day, 2001, Kansas State University, Manhattan, KS, 2001;

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Influence Of Freestall Building Orientation On Comfort Of Lactating Dairy Cattle During Summer Heat Stress (2001), John F. Smith, Joseph P. Harner, Michael J. Brouk Jan 2001

Influence Of Freestall Building Orientation On Comfort Of Lactating Dairy Cattle During Summer Heat Stress (2001), John F. Smith, Joseph P. Harner, Michael J. Brouk

Kansas Agricultural Experiment Station Research Reports

A trial was conducted during the summer of 2000 to evaluate the effect of freestall building orientation"”east-west vs. northsouth"” on respiration rates of lactating dairy cows, temperature-humidity index (THI) in the barns, barn temperature, and barn humidity. Differences between ambient and barn temperature and THI were higher in east-west vs. north-south orientated barns. Respiration rates were higher in north-south than in east-west orientated structures. The magnitude of differences between barn and ambient temperatures and THI did not fully explain differences in respiration rates between north-south and east-west orientated barns. Other factors such as solar radiation, airflow, and animal stress may …

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Effect Of Headlocks On Milk Production And Feed Intake Of Dairy Cattle (2001), John F. Smith, Joseph P. Harner, S.E. Defrain, Michael J. Brouk Jan 2001

Effect Of Headlocks On Milk Production And Feed Intake Of Dairy Cattle (2001), John F. Smith, Joseph P. Harner, S.E. Defrain, Michael J. Brouk

Kansas Agricultural Experiment Station Research Reports

Cows previously trained with headlocks did not increase milk production or feed intake when headlocks were removed. Twoyear- old and older cows did not differ in response to headlocks and neckrails. Prudent use of headlocks increases labor efficiency of a commercial dairy. Managing a dairy without headlocks is a challenge because cows must be sorted and worked off the milking parlor flow. In the case of large milking parlors, it may be necessary to process 50-200 cows per hour. Depending upon the treatment facilities, this number of cows may create a bottleneck in the dairy. For many routine procedures, headlocks …

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Impact Of Dairy Manure Addition On Soil Nutrients In Northeast And South Central Kansas (2001), T. Strahm, Joseph P. Harner, James P. Murphy, G. Mccormack Jan 2001

Impact Of Dairy Manure Addition On Soil Nutrients In Northeast And South Central Kansas (2001), T. Strahm, Joseph P. Harner, James P. Murphy, G. Mccormack

Kansas Agricultural Experiment Station Research Reports

Sixty four percent of the fields (14 of 22) in northeast and south central Kansas would be able to apply dairy manure on a nitrogen basis if the current swine manure application regulations were adopted. Due to high phosphorus levels in some fields, two of the 11 fields in northeast Kansas could not have any manure applied to them. Two other fields in northeast and four fields in south central Kansas would have to limit manure application rates to annual phosphorus required by the crops. Our results indicate minimal accumulation of nitrogen and potassium in the soil profile.; Dairy Day, …

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Evaluation Of Heat Stress In 4- And 6-Row Freestall Buildings Located In Northwest Iowa (2001), John F. Smith, Joseph P. Harner, Michael J. Brouk Jan 2001

Evaluation Of Heat Stress In 4- And 6-Row Freestall Buildings Located In Northwest Iowa (2001), John F. Smith, Joseph P. Harner, Michael J. Brouk

Kansas Agricultural Experiment Station Research Reports

A trial was conducted in the summer of 2000 to evaluate the effect of 4- and 6-row freestall barns located in northwest Iowa on barn temperature, barn humidity, and respiration rates of lactating Holstein cows. Temperature, temperature-humidity index (THI), and respiration rates were greater in 6-row than 4-row freestall barns. Respiration rates were greater in 6-row versus 4-row buildings. The magnitude of difference in the temperature and THI variables may not explain the differences detected in respiration rates. It is possible that a relationship between animal density and social interaction could increase respiration rates when animal density is increased. It …

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Performance Of Holstein Cows Fed Wet Corn Gluten Feed Or Soyhull-Steep Liquor Pellets During Early Lactation (2001), E.E. Ferdinand, Evan C. Titgemeyer, A.F. Park, J.M. Defrain Jan 2001

Performance Of Holstein Cows Fed Wet Corn Gluten Feed Or Soyhull-Steep Liquor Pellets During Early Lactation (2001), E.E. Ferdinand, Evan C. Titgemeyer, A.F. Park, J.M. Defrain

Kansas Agricultural Experiment Station Research Reports

Wet corn gluten feed and soyhull-steep liquor pellets tended to increase dry matter intake and milk yield. Combining condensed corn steep liquor with raw soybean hulls provides a convenient source of digestible fiber and rumen degradable protein.; Dairy Day, 2001, Kansas State University, Manhattan, KS, 2001;

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