Life Sciences Commons^™

The Mare: Breeding Soundness Examination & Reproductive Anatomy, Equine Section, Department Of Animal Sciences, University Of Kentucky

Agriculture and Natural Resources Publications

A complete breeding soundness examination should be conducted before you purchase a mare for breeding or the breeding season. This exam should include more than just an evaluation of the reproductive tract, but also a complete history and physical examination of the mare.

The Stallion: Breeding Soundness Examination & Reproductive Anatomy, Equine Section, Department Of Animal Sciences, University Of Kentucky

Agriculture and Natural Resources Publications

A breeding soundness exam of a stallion includes not only examination of various seminal characteristics, but also, the evaluation of the stallion’s physical condition and his ability to perform in the breeding shed. The physical examination should include evaluation of the locomotor system, including muscular, skeletal and neurological factors, as well as the stallion’s visual function.

The most reliable measure of fertility in a stallion is the pregnancy rate he obtains when bred to mares of normal fertility under ideal management. Most stallions selected for evaluation include those about to be, or recently, purchased, those about to enter the breeding …

Nutrition Of The Performance Horse, Equine Section, Department Of Animal Sciences, University Of Kentucky

Agriculture and Natural Resources Publications

In today’s industry where seconds mean the difference between 1st and “also ran” at the track, our equine athletes must retain a competitive edge. Renewed interest in research about the performance horse’s nutrient needs has allowed horsemen to feed the athletic horse more scientifically than ever before to maintain that edge. Horses can be selected, bred, managed and fed as athletes. However, because knowing the horse’s individuality and nutrient needs is very important, the horseman’s skill in feeding the horse will never be totally replaced, no matter how precise the feeding recommendations.

Nutrition Of The Broodmare, Equine Section, Department Of Animal Sciences, University Of Kentucky

Agriculture and Natural Resources Publications

Feeding horses has long been considered an art passed down from generation to generation. However, recent advances are rapidly making horse nutrition a more precise science. Research in horse nutrition has provided valuable information on the nutrient needs of all classes of horses.

In feeding broodmares, you must consider several important factors:

• nutrient requirements of the particular class of horse being fed,

• physiological events involved in pregnancy,

• nutrient content of the feed,

• physiological limitations to certain rations.

Properties Of Anti-Lyb-2-Mediated B-Cell Activation And The Relationship Between Lyb-2 Molecules And Receptors For B-Cell Stimulatory Factor-1 On Murine B Lymphocytes, Subbarao Bondada, Joan Morris, A. R. Baluyut

Microbiology, Immunology, and Molecular Genetics Faculty Publications

The murine B-cell differentiation antigen Lyb-2 has been shown to be involved in B-lymphocyte activation and has been postulated by some to be related to a receptor for B-cell stimulatory factor I (BSF-1) (H. Yakura et al., J. Immunol. 137, 1475, 1986). Here we have demonstrated that monoclonal antibody (mAB) to Lyb-2 resembles BSF-1 in its ability to activate small resting B cells and enhancement of surface Ia. Anti-Lyb-2 antibodies bound B cells with very high avidity and were able to induce mobilization of cytosolic-free calcium. Anti-Lyb-2 mAB differs from BSF-1 in that BSF-1 but not anti-Lyb-2 is able to …

Impaired Autoreactive T Cell-Induced T Cell-T Cell Interaction In Aged Mice, Venkatachalam Udhayakumar, Subbarao Bondada, Aruna Seth, Mitzi Nagarkatti, Prakash S. Nagarkatti

Microbiology, Immunology, and Molecular Genetics Faculty Publications

Self-Ia-reactive (autoreactive) L3T4⁺ T cell clones have been shown earlier to stimulate the proliferation of syngeneic naive L3T4⁺ T cells and initiate a T cell-T cell (T-T) interaction leading to the generation of immunoregulatory circuits. Since aging has been shown to be associated with a decline of the immune responsiveness, age-related alterations in the T-T interaction was investigated in the present study. Using several I-E^d-specific autoreactive T cell clones isolated from 2- to 3-month-old (young) DBA/2 mice as stimulators, it was observed that L3T4⁺ T cells from 22- to 24-month-old (aged) DBA/2 mice, failed to …

[Review Of] The Body In Time, Robert A. Aken

Library Faculty and Staff Publications

No abstract provided.

Home Lawn Irrigation, A. J. Powell, Mary L. Witt

Agriculture and Natural Resources Publications

For best quality landscapes, supplemental irrigation is almost always necessary during Kentucky summers. If you compare the long-term average rainfall for Kentucky (46 inches annually) and water requirements for growing turf and woody plants, you could easily conclude that lawns and woody plants do not need irrigation. On the other hand, if you consider the extreme variability in our rainfall and temperatures, your need for supplemental irrigation is obvious.

Soil Erodibility: How Is It Determined And Used?, David C. Ditsch, Lloyd Murdock

Agriculture and Natural Resources Publications

The nation's concern about soil erosion has focused on tillage practices used to produce row crops. Because of this concern, legislation now requires grain producers to adopt soil conservation practices if they want to participate in many government programs. The 1985 Farm Bill's conservation provisions classify soils into different erodibility categories. Soils designated as "highly erodible" must have an approved conservation plan if the producer wants to plant crops on them as part of a government program's acreage base.

On what basis is a soil determined to be highly erodible? Experience and common sense point out that several factors such …

Development Of Dynamic Non-Hortonian Watershed Models For Steeply Sloping Forested Watersheds: Application To Eastern Kentucky, Lindell E. Ormsbee, Abdul Q. Khan

KWRRI Research Reports

A comprehensive conceptual watershed model is developed to simulate the hydrologic response of steeply sloping forested watersheds. Two non-Hortonian and two Hortonian models were first tested with data from selected watersheds in West Virginia and eastern Kentucky in order to understand the different mechanisms of flow responsible for storm hydrograph generation in this type of watersheds. The two non-Hortonian models tested were the kinematic storage model (Sloan et al. 1983) and the saturation deficit model (Beven and Wood, 1983). Both models were unable to adequately reproduce the observed hydrographs in the four forested watersheds considered in this research. The two …

The Effect Of Three Tillage Systems On Bulk Density And Porosity Of A Pembroke And A Beasley Soil After Three Years, Kenneth L. Wells, John H. Grove

Agronomy Notes

Many grain producers in Kentucky use a 3 crop in 2 year rotation of corn followed by small grain-soybeans, and commonly no-till the soybeans and corn in order to intensively use sloping land for continuous grain production. Because of the intensity of machinery traffic in this system, growers are concerned that continuous no-till management may cause compaction, and that such fields may need occasional primary tillage. In order to obtain' information regarding things situation, we conducted a test for 3 years on the farm of' Philip Lyvers, in Marion County, Kentucky, in a field which was being used in a …

1987 Update Of Agronomic Performance Of Tall Fescue Varieties, Paul B. Burrus Ii, Garry D. Lacefield, J. Kenneth Evans

Agronomy Notes

Tall fescue (Festuca arundinacea, Schreb.) is a well adapted, widely used pasture species occupying approximately 5.5 million acres in Kentucky and 35 million acres in the south central United States.

Commercial tall fescue varieties have been developed from plant materials of either northern European or Mediterranean origin. Varieties developed at the University of Kentucky -- Kentucky 31, Kenmont, Kenwell, Kenhy, and Johnstone -- trace to plant materials of northern European origin. The Kentucky varieties have later maturity dates and have greater resistance to certain foliar diseases during summer than varieties that are of Mediterranean origin (i.e., Alta, Fawn, Goar, and …

Gray Mold Of Strawberry, John R. Hartman, Donald E. Hershman

Agriculture and Natural Resources Publications

Several fungi can cause developing and ripe strawberries to rot. In Kentucky the most common and economically important of these diseases is gray mold, caused by the fungus Botrytis cinerea. Also called Botrytis rot or ash mold, it is an ever-present threat to strawberries both in the field and after harvest. It can be particularly devastating because the disease strikes after investments in the crop have been made, but before returns have been fully realized.

Adjusting Soil Ph On Heavy Textured Soils Of The Eden Hills, Kenneth L. Wells, R. M. Jones

Agronomy Notes

The Eden Hills Area (also known as The Hills of the Bluegrass) of Kentucky lies adjacent to the Inner Bluegrass Area in a crescent shape within which a large area of several counties occur. Carroll, Owen, Grant, Gallatin, Pendleton, and Robertson Counties occur almost entirely within this physiographic region and several other counties have sizable acreages within it. Soils of the area have formed largely on Ordovician aged calcareous siltstones of the Garrard Formation and interbedded calcareous shales, thin limestones, and siltstones of the Eden Formation. Soils developed from these formations occur on strongly sloping to steep landscapes and have …

Effect Of Fertilizer Rates And Placement Practices On Yield Of Burley Tobacco, Kenneth L. Wells, G. D. Cantrill, J. L. Sims

Agronomy Notes

Management of fertilizer practices in production of burley tobacco is very important in control of manganese (Mn) toxicity of the crop. In addition to the use of agricultural limestone, the use of fertilizers in the appropriate amounts, the appropriate kinds, and in the appropriate manner can strongly influence acidity in the rooting zone during the growth of burley. Studies of these effects have made up a major thrust of the University of Kentucky's research programs on fertility of burley, and have largely been conducted by J.L. Sims and his students during the past 15 years.

Marketing Quality Alfalfa Hay, Garry D. Lacefield

Kentucky Alfalfa and Stored Forage Conference

Alfalfa hay is a potentially marketable-profitable product if--if quality is satisfactory to meet buyer's needs, if it is packaged such that it meets buyer's feeding program and can be transported efficiently, if in sufficient quantity, if storage site is accessible by truck or trailer, and if it is competitively priced. Meeting these minimum criteria only means the hay is potentially marketable; only after it has been sold does it become potentially profitable.

Feeding Alfalfa To South Carolina Dairy Herds, Fred E. Pardue, Terry Sudduth

Kentucky Alfalfa and Stored Forage Conference

The nutritional value of alfalfa hay is important if it is to be used competitively with other feedstuffs in rations being fed to South Carolina Dairy Herds. Excellent quality hay has high nutrient concentration, digestibility and intake. The appearance of good physical characteristics of alfalfa hay as well as other hays and forages along with the knowledge of harvest dates, stages of maturity, and other conditions are not enough and can be deceiving. Therefore, forage testing is crucial and very important.

Marketing Kentucky Hay — An Update, J. Kenneth Evans

Kentucky Alfalfa and Stored Forage Conference

Based on soil capabilities, Kentucky could grow 2-million acres of alfalfa while increasing the acreage of corn and soybeans. Even more than 2-million acres could be grown if Kentucky grown alfalfa should show market demands making it economically competitive with corn and soybeans. Marketing is the key to developing demand which could make hay a $1-billion Kentucky crop.

Many of you have heard or read my comments on marketing hay. In this presentation, I will present a brief review of what I have previously said and then bring you up to date on hay marketing activities since the alfalfa conference …

Evaluating Alfalfa Grazing — Dollars And Cents, Robert N. Barnes

Kentucky Alfalfa and Stored Forage Conference

Returns on many Kentucky farms are declining due to reduced tobacco and feedgrain income. This fact, coupled with traditionally low (or negative) returns from typical cow/calf beef enterprises, has been associated with interest in alternative crop and livestock production systems. Alfalfa produced as a cash crop is increasing and many farmers are realizing substantial returns. In the Central Kentucky Area, many farmers have been stimulated to produce alfalfa since demand for high quality hay by horse farms has been strong. As interest in alfalfa is renewed, other farms have begun to introduce intensive or controlled grazing techniques in order to …

Grazing Options In Alfalfa Utilization, Paul D. Deaton

Kentucky Alfalfa and Stored Forage Conference

Objective

1. The pure alfalfa stand would not be damaged during the grazing period.
2. For steers - animal performance while on the alfalfa was more important than pounds of beef produced per acre.
3. For cow/calf - animal density high enough to remove green leaf area in maximum of 5 days.
4. Initiate the demonstration with a minimal out-of-pocket cost for fence, water system, etc.
5. Minimize the occurrence of bloat where possible.

Comparison Of Electrical Moisture Meters For Baled Alfalfa Hay, W. H. Henson Jr., G. M. Turner, Michael Collins, O. J. Yeoman

Kentucky Alfalfa and Stored Forage Conference

A primary concern in producing quality alfalfa hay is moisture measurement. Some precision in moisture measurement is required since hay can be too wet, leading to dry matter and quality loss through mold; it can be too dry, leading to shatter loss during baling, handling and storage.

Moisture measurement in hay can take many forms. One form of subjective (personal judgment) evaluation is brittleness of leaves and stems in the windrow or bale. Typical objective methods consist of electric meters with calibration curves and oven drying.

Advances In Alfalfa Weed Control, James R. Martin

Kentucky Alfalfa and Stored Forage Conference

The most significant advances in weed control in alfalfa have originated from developments in herbicide technology, This method of weed control began over 20 years ago when such herbicides as EPTC and 2,4-DB were being used by alfalfa farmers. Since then, more than twelve herbicides have been added to the list of products recommended for weed control in alfalfa. (For specific recommendations, see Extension publication "Chemical Control of Weeds in Kentucky Farm Crops", AGR-6).

Influence Of Potato Leafhopper On Alfalfa Yield And Quality, C. M. Christensen

Kentucky Alfalfa and Stored Forage Conference

The potato leafhopper has the distinction of being one of the native insects that can have a very major impact on the production characteristics of alfalfa. This insect is very definitely the second most important pest of this crop, with the alfalfa weevil, an imported insect, holding the distinction of being the most damaging. These tiny insects (full grown potato leafhoppers are 1/8 inch long) have a very definite impact on alfalfa but their damage is very insidious and hard to recognize.

Quality Seed Production And Use, Garry D. Lacefield

Kentucky Alfalfa and Stored Forage Conference

Quality seed is an important consideration and investment in an efficient alfalfa program. Farmers who depend on alfalfa need to be certain that the seed they purchase is of high quality. High quality seed means it must be free of noxious weeds, have a purity of 99.5 percent, a germination of approximately 90 percent or higher and be seed that is true to the variety stated.

Effects Of Soils And Fertility On Alfalfa Production, Monroe Rasnake

Kentucky Alfalfa and Stored Forage Conference

Alfalfa can be grown anywhere in Kentucky and on a wide range of soil types. This statement seems to contrast with what we are accustomed to hearing in regard to alfalfa. The usual statement is: "Alfalfa requires a deep, well drained and highly fertile soil . . .". Actually, the two statements are not conflicting. They just represent the plant-soil interactions. The first looks at what is possible while the other is concerned with the ideal situation. In order to understand these different perspectives, we need to consider how soil characteristics affect the alfalfa plant.

Foreword [1987], Garry D. Lacefield

Kentucky Alfalfa and Stored Forage Conference

This is the front matter of the proceedings.

Early Events In B-Cell Activation: Anti-Lyb2, But Not Bsf-1, Induces A Phosphatidylinositol Response In Murine B Cells, Stephan A. Grupp, Judith A. K. Harmony, Arthur R. Baluyut, Subbarao Bondada

Microbiology, Immunology, and Molecular Genetics Faculty Publications

Previous studies have indicated that the murine surface antigen Lyb2 is involved in an activation pathway that apparently does not involve the surface immunoglobulin receptor. As sIg has been shown to transduce its activation signal through the breakdown of phosphatidylinositol (PI), and since activation via Lyb2 does not involve sIg, it was of interest to determine if binding to Lyb2 generates a PI response. We have demonstrated that an allele-specific monoclonal antibody to Lyb2 (anti-Lyb2 mab), which has previously been shown to drive B cells into S, also activated PI metabolism in these cells. This activation occurred in a dose-dependent …

Sucker Control In Burley And Dark Tobaccos, Gary K. Palmer, Jones H. Smiley, Jimmie R. Calvert

Agriculture and Natural Resources Publications

Removing the tops of tobacco plants removes the dominant influence of the terminal shoot over lateral shoots or "suckers." If left unchecked, suckers can severely reduce yield and quality of tobacco. Manual control of suckers has almost totally given way to less expensive and more efficient chemical control. Three types of chemical sprays for controlling sucker growth on tobacco plants are:

• Systemic--These chemicals are absorbed by plants and move inside the plant to active growth sites,

• Contact--These chemicals are not absorbed by plants and must be used so as to contact the suckers directly.

• Local systemic--This chemical runs down the …

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Lawn Irrigation With Automatic Systems, A. J. Powell Jr.

Agriculture and Natural Resources Publications

Automatically time-controlled underground lawn irrigation systems have become readily available in Kentucky. When the systems are properly designed and installed, they can be effectively used to grow high-quality turf. In addition to applying necessary water for plant growth, proper irrigation can

• provide water to move pesticides and fertilizers to the root zone,
• remove frost,
• help reduce thatch by maintaining a moist environment for microbial degradation,
• cool the plant surface and air that surrounds the home or commercial building, through the process of plant evapotranspiration.

Effects Of Acid Ph On Embryonic And Juvenile Freshwater Fish, Barbara A. Ramey, Lee E. Colton

KWRRI Research Reports

The effects of sulfuric acid on embryos, larvae, and juvenile fish were examined using standard bioassay techniques, as well as in a preference/ avoidance behavioral test. The objectives were to compare the sensitivities of the various ages of fish to acid and to assess the use of the behavioral test in a hazard assessment program. In an 8-day static renewal bioassay, embryos and larvae of the fathead minnow were not affected at a pH of 4.92 and above, but pH 3.57 produced complete mortality prior to hatching. In 96- hr acute bioassays, 8-wk juvenile fathead minnows survived 100% at pH's …