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Full-Text Articles in Life Sciences
Ec97-274 Management Of Replacement Gilts For Efficient Reproduction, Donald G. Levis
Ec97-274 Management Of Replacement Gilts For Efficient Reproduction, Donald G. Levis
University of Nebraska-Lincoln Extension: Historical Materials
Successfully introducing replacement gilts into the breeding herd is an important aspect of breeding herd efficiency. To attain herd efficiency, females must ovulate adequate numbers of viable ova, express estrus, show willingness to mate and conceive in a regular manner. If these qualities are properly developed, pregnancy rate and litter size will be maximized. A gilt development and management program needs to be designed for gilts from birth to farrowing their first litter.
1997 Nebraska Swine Report, Duane E. Reese
1997 Nebraska Swine Report, Duane E. Reese
University of Nebraska-Lincoln Extension: Historical Materials
This publication was prepared by the staff in Animal Science and cooperating Departments for use in Extension, Teaching and Research programs. It deals with the results that were done in reproduction, breeding, health, nutrition, seconomics and housing of swine.
Mp68 1996-98 Dairy Report
University of Nebraska-Lincoln Extension: Historical Materials
Annual Report of University of Nebraska-Lincoln Dairy Research for 1997-1998. Topics include:
Time of Initiating Dietary Fat Supplementaion on Lactation and Reproduction
A Soyhull:Soy Lecithin Soapstock Mixture for Early Lactation Dairy Cows
Nonenzymatically Browned Soybeans for Dairy Cattle
Feather and Blood Meal Combination for Lactating Dairy Cows
Impact of Nonfiber Carbohydrate Concentration on Forage Fiber Digestion
Sulfite Liquor-Treated Meat and Bone Meal for Dairy Cows
The OTHER Causes of Infectious Diseases
Test Day Genetic Evaluations
Income and Herdlife
Maternal Genetic and Cytoplasmic Effects in Dairy Cattle
Financial and Management Survey of Nebraska Dairy Producers
Free-Stall Design and Maintenance
Horizontal Silos …
Ec96-219 1996 Nebraska Swine Report, Duane Reese
Ec96-219 1996 Nebraska Swine Report, Duane Reese
University of Nebraska-Lincoln Extension: Historical Materials
The 1996 Nebraska Swine Report was prepared by the staff in Animal Science and cooperating Departments for use in Extension, Teaching and Research programs. This publications deals with research on swine reproduction, breeding, health, nutrition, economics, and housing.
G96-1278 Use Of Cooled Stallion Semen, Kathleen P. Anderson
G96-1278 Use Of Cooled Stallion Semen, Kathleen P. Anderson
University of Nebraska-Lincoln Extension: Historical Materials
This NebGuide discusses the benefits of using cooled stallion semen for horse breeding.
Using cooled, transported stallion semen is quickly becoming a viable breeding option for many horse producers. An increasing number of breed associations are recognizing the benefits of cooled semen and making it an option for producers. Mare owner's who are able to use cooled semen experience less expense related to breeding, if the program is properly conducted. Transporting cooled semen from the stud farm to the mare allows owners to reduce mare care and transportation costs. Furthermore, because the mare will remain on-the-farm, there is less chance …
1996 Nebraska Swine Report, Duane E. Reese
1996 Nebraska Swine Report, Duane E. Reese
University of Nebraska-Lincoln Extension: Historical Materials
This publication was prepared by the staff in Animal Science and cooperating Departments for use in Extension,Teaching and Research programs. It deals with the results that were done in reproduction, breeding, health, nutrition, economics and housing of swine.
Ec94-219 1995 Nebraska Swine Report, Rodger K. Johnson
Ec94-219 1995 Nebraska Swine Report, Rodger K. Johnson
University of Nebraska-Lincoln Extension: Historical Materials
The 1995 Nebraska Swine Report was prepared by the staff in Animal Science and cooperating Departments for use in Extension, Teaching and Research programs. This publications deals with research on swine reproduction, breeding, health, nutrition, economics, and housing.
1995 Nebraska Swine Report, Rodger K. Johnson
1995 Nebraska Swine Report, Rodger K. Johnson
University of Nebraska-Lincoln Extension: Historical Materials
This publication was prepared by the staff in Animal Science and cooperating Departments for use inExtension, Teaching and Research programs. It deals with the results that were done in reproduction, breeding, health, nutrition, economics and housing of swine.
G95-1235 Growth Implants On Beef Heifer Reproduction, Gene H. Deutscher
G95-1235 Growth Implants On Beef Heifer Reproduction, Gene H. Deutscher
University of Nebraska-Lincoln Extension: Historical Materials
This guide discusses the benefits and concerns in the use of growth implants with beef heifers. Growth promoting implants are used extensively in beef cattle finishing programs and in suckling and growing steer programs. Implants are one of the most economical means of improving performance. However, producers are concerned with implanting suckling and growing heifers because of the possible negative effects on subsequent reproduction of heifers selected as replacements. Replacement heifers need to grow rapidly, reach puberty early, conceive early, and increase in skeletal structure to reduce calving difficulty. If implants could be used to increase growth and skeletal structure …
Ec94-271 Understanding Mare Reproduction, Kathleen P. Anderson
Ec94-271 Understanding Mare Reproduction, Kathleen P. Anderson
University of Nebraska-Lincoln Extension: Historical Materials
Many producers who raise horses find breeding mares rewarding, yet frustrating. Mares and stallions are traditionally placed in the breeding herd due to successful performance records, with littie considerations for their reproductive capacibilities. Basic understanding of the mare's reproductive physiology can improve reproductive efficiency and foaling rates. A mare manager's goal should be to get the maximum number of mares pregnant, in the shortest amount of time, and to deliver a live, healthy foal each year.
G94-1197 The Genetics And Management Of Sound Feet And Legs, Jeffrey F. Keown
G94-1197 The Genetics And Management Of Sound Feet And Legs, Jeffrey F. Keown
University of Nebraska-Lincoln Extension: Historical Materials
Sound management of feet and legs in dairy animals affects performance. This guide offers suggestions for good management practices.
Two major parameters affect the selection process for any trait: the heritability of the trait as well as the variation associated with the trait.
G89-926 Swine Reproductive Problems: Infectious Causes, Alex Hogg, Donald G. Levis
G89-926 Swine Reproductive Problems: Infectious Causes, Alex Hogg, Donald G. Levis
University of Nebraska-Lincoln Extension: Historical Materials
This NebGuide describes causes, clinical signs, control, prevention and treatment of swine reproductive problems due to infectious diseases. The reproductive potential for the ideal sow has been calculated as 31.2 pigs weaned per year. The United States average is 14 pigs per sow per year--less than one-half the reproductive potential of the ideal sow. A major part of this low reproductive efficiency is due to either infectious or non-infectious causes. The infectious causes of swine reproductive problems are addressed here.
G89-989 How To Interpret The New Animal Model For Dairy Sire Evaluation, Jeffrey F. Keown
G89-989 How To Interpret The New Animal Model For Dairy Sire Evaluation, Jeffrey F. Keown
University of Nebraska-Lincoln Extension: Historical Materials
In question and answer format this NebGuide addresses changes in genetic evaluations of both dairy cows and sores.
Why is the United States Department of Agriculture (USDA) changing the dairy sire and cow evaluation system?
The answer is simple. The Animal Model for genetic evaluations is more accurate than the old Modified Contemporary Comparison Method (M.C.C.). Previously the major limiting factors to implementing the Animal Model were computing costs and memory requirements. With the advent of new Super Computers, the computations are feasible on a national scale.
What is the Animal Model?
The Animal Model simultaneously evaluates cows and sires …
G88-879 Peafowl, Earl W. Gleaves
G88-879 Peafowl, Earl W. Gleaves
University of Nebraska-Lincoln Extension: Historical Materials
This NebGuide discusses the care and feeding of the colorful and ornamental peafowl.
The peafowl is an ornamental bird which is often grown to adorn farmsteads, private estates or public parks and zoological gardens. They enjoy living in the open and prefer to roost in trees. The roosting place should be arranged some distance from dwellings because peafowl are inclined to be noisy, especially at night.
G87-851 Improving Reproductive Performance And Productivity Of Beef Herds, Gene H. Deutscher
G87-851 Improving Reproductive Performance And Productivity Of Beef Herds, Gene H. Deutscher
University of Nebraska-Lincoln Extension: Historical Materials
NebGuide discusses management practices that can be used to improve reproduction and productivity of beef herds. The major objective of cow-calf producers should be to wean a calf from each cow every year. The average calf crop weaned in Nebraska is estimated at 80 calves weaned per 100 cows in breeding herds. A realistic goal is 90 to 95 calves weaned per 100 cows.
G86-820 How To Maximize Income By Managing Days Dry, Jeffrey F. Keown
G86-820 How To Maximize Income By Managing Days Dry, Jeffrey F. Keown
University of Nebraska-Lincoln Extension: Historical Materials
This guide discusses the benefits of maintaining the optimum calving interval and offers suggestions for accomplishing this reproductive management technique.
Most dairy producers are aware that an optimum calving interval is 365 days. This is a normal lactation length of 305 days with a dry period of 60 days. This interval is often looked at as a goal to strive toward rather than a goal that must be reached to maximize income from the sale of milk.
G86-822 How To Estimate A Dairy Herd's Reproductive Losses, Jeffrey F. Keown
G86-822 How To Estimate A Dairy Herd's Reproductive Losses, Jeffrey F. Keown
University of Nebraska-Lincoln Extension: Historical Materials
Remedies for herd losses caused by calving interval, dry periods, A.I. performance, and age at first freshening.
One of the major areas of lost income to the dairy producer is in the reproductive performance of the dairy herd. These losses are often overlooked because they are indirect costs. If producers could be given a monthly bill indicating the amount of money that improper reproductive management has cost them, then drastic changes would occur.
The majority of reproductive losses occur in the following areas:
1. Calving interval too long or too short.
2. Dry period too long or too short.
3. …
G85-759 Prominent Congenital Defects In Nebraska Beef Cattle, J. L. Johnson, H. W. Leipold, Donald B. Hudson
G85-759 Prominent Congenital Defects In Nebraska Beef Cattle, J. L. Johnson, H. W. Leipold, Donald B. Hudson
University of Nebraska-Lincoln Extension: Historical Materials
This NebGuide describes congenital defects that affect the economic value of beef cattle, and provides recommendations on how to minimize them in breeding programs.
Congenital defects are abnormalities of structure or function present at birth. They may be caused by genetic or environmental factors, or a combination of both. The causes of many defects remain unknown.
Developmental defects may be lethal, semi-lethal, or compatible with life, causing very little effect or only aesthetic effect.
With the increasing use of artificial insemination (AI) in cattle, defects are no longer rare occurrences and are important collectively to the cattle industry. Congenital defects …
G85-755 How To Set Goals For Your Breeding Program, Jeffrey F. Keown
G85-755 How To Set Goals For Your Breeding Program, Jeffrey F. Keown
University of Nebraska-Lincoln Extension: Historical Materials
This NebGuide describes how to determine which trait(s) to select for, and how multiple trait selection affects genetic progress.
Dairy producers are often concerned with placing emphasis on different production traits in their breeding program. Selecting on only economically important traits should be the objective of every producer. The use of artificial insemination (A.I.) sires is the most economical and productive way to increase the genetic potential of the herd.
A cow's record is a measure of her genetic potential, which is modified by the environment in which she is kept. Environmental factors that directly influence a cow's record include …
G81-574 Reproductive Diseases In Cattle, Duane Rice
G81-574 Reproductive Diseases In Cattle, Duane Rice
University of Nebraska-Lincoln Extension: Historical Materials
The reproductive diseases mentioned in this NebGuide comprise some of the more common problems confronting the cattle industry today.
Although many advances have been made in controlling reproductive diseases in cattle, serious losses are still common. These losses can be reduced by recognizing the diseases and following the proper management recommendations that are available today. Nearly 50 percent of reproductive failure in cattle is due to infectious diseases, and there are vaccines available that can prevent some of these. Management recommendations may include: 1) vaccines, 2) general sanitation, 3) artificial insemination (AI) or, if a problem is already present, 4) …
G80-537 Reproductive Trace Anatomy And Physiology Of The Cow, Gene H. Deutscher
G80-537 Reproductive Trace Anatomy And Physiology Of The Cow, Gene H. Deutscher
University of Nebraska-Lincoln Extension: Historical Materials
Knowledge of basic reproduction will help a producer to obtain higher conception rates when using estrous synchronization and/or artificial insemination. The reproductive performance of a cow herd has a great influence on the income and profit realized. A good understanding of the anatomy and physiology of the cow's reproductive system is, therefore, beneficial for successful management. Knowledge of basic reproduction will help a producer to obtain higher conception rates when using estrous synchronization and/or artificial insemination. It will also allow for a better understanding of pregnancy examinations, reproductive diseases and calving difficulty problems.
G80-536 Reproductive Trace Anatomy And Physiology Of The Bull, Gene H. Deutscher
G80-536 Reproductive Trace Anatomy And Physiology Of The Bull, Gene H. Deutscher
University of Nebraska-Lincoln Extension: Historical Materials
Understanding the anatomy and physiology of the bull's reproductive tract is beneficial for proper management. Good reproductive performance of a bull is necessary to obtain a high percent calf crop. A bull must be fertile and capable of servicing a large number of cows during a short breeding season for optimum production. Understanding the anatomy and physiology of the bull's reproductive tract is beneficial for proper management. A basic knowledge of the reproductive system will also help the producer to understand fertility examinations, reproductive problems and breeding impairments.
The Structure And Reproduction Of Corn, T. A. Kiesselbach
The Structure And Reproduction Of Corn, T. A. Kiesselbach
Nebraska Agricultural Experiment Station: Historical Research Bulletins
The primary purpose of this paper is to summarize investigations concerning the structure and reproduction of the corn plant (Zea mays L.). Because of wide interest in the reproductive process in connection with breeding and genetic studies the floral development, fertilization, and embryology are especially stressed. The morphology and development of the vegetative organs is also included. The botanical relationship, origin, genetics and breeding of corn are briefly considered.