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Leptin Receptor Gene As A Genetic Marker For Leanness In Pigs, Max F. Rothschild, Amy L. Vincent, Catherine W. Ernst Oct 2002

Leptin Receptor Gene As A Genetic Marker For Leanness In Pigs, Max F. Rothschild, Amy L. Vincent, Catherine W. Ernst

Iowa State University Patents

Disclosed herein are genetic markers for pig leanness, methods for identifying such markers, and methods of screening pigs to determine those more or less likely to be obese and more or less likely to produce litters with leans or obese offspring and preferably selecting those pigs for future breeding purposes. The markers are based upon the presence or absence of certain polymorphisms in the pig leptin receptor gene.


Minimizing The Use Of Antibiotics In Pork Production, Palmer J. Holden, John Carr, Mark S. Honeyman, James B. Kliebenstein, James D. Mckean, Jay D. Harmon, John W. Mabry, Sherry Hoyer Oct 2002

Minimizing The Use Of Antibiotics In Pork Production, Palmer J. Holden, John Carr, Mark S. Honeyman, James B. Kliebenstein, James D. Mckean, Jay D. Harmon, John W. Mabry, Sherry Hoyer

Iowa Pork Industry Center Fact Sheets

Details on minimizing antibiotic use in pork production such as reducing stress. Other issues to consider include biosecurity measures and increased costs of producing antibiotic-free pigs.


Effect Of Yeast Supplement On Performance Of Steer Calves, Darrell Busby, Daniel D. Loy, Dallas L. Maxwell Jan 2002

Effect Of Yeast Supplement On Performance Of Steer Calves, Darrell Busby, Daniel D. Loy, Dallas L. Maxwell

Iowa State Research Farm Progress Reports

The effect of Prosponse1 yeast supplement fed to newly arrived steers was evaluated at the ISU Armstrong Research Farm near Lewis, Iowa. Four pens of approximately 32 head were fed similar diets with 2 pens receiving yeast supplement and 2 pens not. Calves were weighed on delivery to the feedlot and allocated on weight and sire. Calves were on test 34 days. There was no effect on daily gain or feed to gain. Dry matter intake trended higher for the yeast supplemented calves (P=.10). These data suggest that yeast supplement may improve dry matter intake in newly arrived ...


Beef Cattle Breeding Project Progress Report: Growth Trait Epds For 1998-, 1999-, And 2000-Born Calves, Abebe T. Hassen, D. E. Wilson, Gene H. Rouse, Richard G. Tait Jr. Jan 2002

Beef Cattle Breeding Project Progress Report: Growth Trait Epds For 1998-, 1999-, And 2000-Born Calves, Abebe T. Hassen, D. E. Wilson, Gene H. Rouse, Richard G. Tait Jr.

Iowa State Research Farm Progress Reports

The Iowa State University beef cattle breeding project was designed to develop two selection lines of beef cattle for use as a research base to answer questions that influence genetic improvement. The project was started in 1996 and is being conducted at Rhodes (central Iowa) and McNay (southern Iowa) research and demonstration farms.


Whole Farm Nutrient Balance Under Different Grazing Systems: Project Overview, Wendy Powers, James R. Russell, Mathew M. Haan Jan 2002

Whole Farm Nutrient Balance Under Different Grazing Systems: Project Overview, Wendy Powers, James R. Russell, Mathew M. Haan

Iowa State Research Farm Progress Reports

The amount of phosphorus (P) in surface runoff from agricultural lands is of concern because of the potential for eutrophication of Iowa’s waterways. Currently, there is limited information about the total P loads in surface runoff coming from pastureland in the Midwest. Much of the P runoff is likely associated with sediment. Because foliage limits soil disruption caused by the impact of raindrops and because forage roots hold soil particles, forages harvested at an appropriate height, through suitable grazing management, should maintain water infiltration and minimize sediment and P loss in surface runoff from pastures. Grazing management may influence ...


Three-Year Summary Of Performance Of Finishing Pigs In Hoop Structures And Confinement During Winter And Summer, Mark S. Honeyman, Jay D. Harmon Jan 2002

Three-Year Summary Of Performance Of Finishing Pigs In Hoop Structures And Confinement During Winter And Summer, Mark S. Honeyman, Jay D. Harmon

Iowa State Research Farm Progress Reports

The objectives of the study were to document the performance of finishing pigs in hoops during the summer and winter as well as evaluate pig performance in hoops compared with pigs in a confinement housing system.


Evaluation Of Year-Round Forage Management Systems For Spring- And Fall-Calving Beef Cows, N. A. Janovick, James R. Russell, D. Maxwell, L. James Secor Jan 2002

Evaluation Of Year-Round Forage Management Systems For Spring- And Fall-Calving Beef Cows, N. A. Janovick, James R. Russell, D. Maxwell, L. James Secor

Iowa State Research Farm Progress Reports

Stored feeds make up almost half the cost of production for cow–calf enterprises in Iowa. Therefore, any reduction in the amount of stored feeds needed to maintain cows through the winter can have an impact on overall costs of maintaining the herd. Two resources that may be used to reduce the use of stored feeds are corn-crop residues and stockpiled perennial forages, which may be grazed during the winter. The objective of this experiment was to design and evaluate grazing systems to utilize such resources.


Comparison Of Ultrasound And Carcass Measures To Predict The Percentage Of Lean Beef From Four Primal Cuts – A Progress Report, Richard G. Tait Jr., Gene H. Rouse, D. E. Wilson Jan 2002

Comparison Of Ultrasound And Carcass Measures To Predict The Percentage Of Lean Beef From Four Primal Cuts – A Progress Report, Richard G. Tait Jr., Gene H. Rouse, D. E. Wilson

Iowa State Research Farm Progress Reports

The objective of this study was to determine how real-time ultrasound (RTU) measurements would compare with carcass measurements to predict the percentage of lean from the four primals (PERL4P).


Managing Fat – The Future Of The Beef Industry, Gene H. Rouse, D. E. Wilson Jan 2002

Managing Fat – The Future Of The Beef Industry, Gene H. Rouse, D. E. Wilson

Iowa State Research Farm Progress Reports

Beef cattle are an important link in the food chain. These ruminants can turn roughage and by-products into highly digestible complete protein, energy, minerals, and vitamins.


Comparison Of Ultrasound And Carcass Measures To Predict The Percentage Of Lean Beef From Four Primal Cuts – A Progress Report, Richard G. Tait Jr., Gene H. Rouse, Doyle E. Wilson Jan 2002

Comparison Of Ultrasound And Carcass Measures To Predict The Percentage Of Lean Beef From Four Primal Cuts – A Progress Report, Richard G. Tait Jr., Gene H. Rouse, Doyle E. Wilson

Iowa State Research Farm Progress Reports

The objective of this study was to determine how real-time ultrasound (RTU) measurements would compare with carcass measurements to predict the percentage of lean from the four primals (PERL4P). Data were collected on market ready cattle (n=490). Traditional carcass measures collected were: (1) hot carcass weight (HCW); (2) 12–13th rib fat thickness (CFAT); (3) 12–13th rib ribeye area (CREA); and (4) percentage of kidney, pelvic, and heart fat (KPH).


Integration Of Pasturing Systems For Cattle-Finishing Programs, Hayati Koknaroglu, M. Peter Hoffman Jan 2002

Integration Of Pasturing Systems For Cattle-Finishing Programs, Hayati Koknaroglu, M. Peter Hoffman

Iowa State Research Farm Progress Reports

In areas consisting of highly productive land interdispersed with highly erodable land, the latter would best fit the concept of sustainable agriculture by being placed into permanent pasture. The objective of this study was to graze steer calves for varying lengths of time on such permanent pasture and then to finish then in drylot and determine the subsequent impact on feedlot performance, carcass composition, and economic return.


The Economics Of Finishing Pigs In Hoop Structures And Confinement Facilities: A Summer Comparison, Benjamin Larson, James B. Kliebenstein, Mark S. Honeyman, Arlie D. Penner Jan 2002

The Economics Of Finishing Pigs In Hoop Structures And Confinement Facilities: A Summer Comparison, Benjamin Larson, James B. Kliebenstein, Mark S. Honeyman, Arlie D. Penner

Iowa State Research Farm Progress Reports

This report is part of an ongoing research project that is being conducted at the Iowa State University Rhodes Research Farm. This research is aimed at comparing two swine finishing facility types under a wide range of circumstances. This report provides results from a group of pigs finished during the summer season of 2000–2001. Evolution of the swine industry has forced industry members to reevaluate operations and utilize an increasing amount of risk management. A survey conducted in May 2001 showed that hoop buildings are becoming an important part of the swine industry. Hoop buildings became widely available in ...


Sequential Grazing Of Cool- And Warm-Season Pastures, Kenneth J. Moore, E. Charles Brummer, M. H. Wiedenhoeft, James R. Russell, Roger L. Hintz, Todd White, L. James Secor, Dennis R. Maxwell Jan 2002

Sequential Grazing Of Cool- And Warm-Season Pastures, Kenneth J. Moore, E. Charles Brummer, M. H. Wiedenhoeft, James R. Russell, Roger L. Hintz, Todd White, L. James Secor, Dennis R. Maxwell

Iowa State Research Farm Progress Reports

Pasture productivity in Iowa often is limited by low productivity of cool-season grasses during summer. This uneven seasonal distribution of forage production could be improved by including species in pasture systems that perform better under higher temperatures. Warm-season grasses produce most of their growth during summer when cool-season grasses are semi-dormant. By using cool-season and warm-season pastures in a sequential system, it should be possible to improve seasonal productivity.


Use Of Oats In Swine Diets Fed In Deep-Bedded Hoop Barns, Mark S. Honeyman, Wayne B. Roush Jan 2002

Use Of Oats In Swine Diets Fed In Deep-Bedded Hoop Barns, Mark S. Honeyman, Wayne B. Roush

Iowa State Research Farm Progress Reports

The use of hoop barns for feeding finishing pigs has expanded rapidly in Iowa. A recent survey reported over 2,000 hoops used for finishing pigs in Iowa. Extensive work on feeding pigs in hoops has been conducted by Iowa State University researchers. Finishing pigs were fed for 3 years in bedded hoop structures and a confinement building with slotted floors in central Iowa. When summer and winter feeding periods for 3 years were combined, the work showed that the finishing pigs in hoops ate more feed, grew faster, and required more feed per unit of liveweight gain than confinement ...


The Effects Of Gestation Housing On The Reproductive Performance Of Gestating Sows: A Progress Report, Mark S. Honeyman, Jay D. Harmon, Dennis Kent, Don Hummel Jan 2002

The Effects Of Gestation Housing On The Reproductive Performance Of Gestating Sows: A Progress Report, Mark S. Honeyman, Jay D. Harmon, Dennis Kent, Don Hummel

Iowa State Research Farm Progress Reports

There is increasing interest in evaluating group housing for gestating sows. The majority of gestating sows are housed in individual stalls or crates for the majority of the gestation period (100–110 days). Hoop structures are low-cost shelters that can be used for swine. By using feeding stalls and cornstalk bedding, hoops provide a feasible housing system for gestating swine. The objective of this long-term study is to evaluate effects of gestation housing on reproductive performance of sows. Group-housed gestating sows in static groups were compared to sows in individual gestation crates. "Static" refers to a group of sows that ...


Beef Cattle Breeding Project Progress Report: Body Composition Epd Determined From Ultrasound Measures, Doyle E. Wilson, Abebe T. Hassen, Gene H. Rouse, Richard G. Tait Jr. Jan 2002

Beef Cattle Breeding Project Progress Report: Body Composition Epd Determined From Ultrasound Measures, Doyle E. Wilson, Abebe T. Hassen, Gene H. Rouse, Richard G. Tait Jr.

Iowa State Research Farm Progress Reports

The Iowa State University beef cattle breeding project was initiated in 1996 and is being conducted at the Rhodes and McNay research and demonstration farms. The project uses the field data of the American Angus Association (AAA) along with the research resource cattle of the farms to study questions that will enhance the genetic investigations using the field data.


An Economic Analysis Of Pork Production In Hoop And Confinement Facilities: A Winter Comparison, Benjamin Larson, James B. Kliebenstein, Mark S. Honeyman, Arlie D. Penner Jan 2002

An Economic Analysis Of Pork Production In Hoop And Confinement Facilities: A Winter Comparison, Benjamin Larson, James B. Kliebenstein, Mark S. Honeyman, Arlie D. Penner

Iowa State Research Farm Progress Reports

This report is part of an ongoing research project that is being conducted at the Iowa State University Rhodes Research Farm. This research is aimed at comparing two swine finishing facility types under a wide range of circumstances. This report provides results from a group of pigs finished during the winter season of 2000–2001. The evolution of the swine industry has forced industry members to reevaluate their operations and utilize an increasing amount of risk management. A survey conducted in May of 2001 showed that hoop buildings are becoming an increasingly important part of the swine industry. Hoop buildings ...


Pasture Enhancement Of Warm-Season Grass Pastures Using A Complex Mixture Of Legumes, I. S. Braden, Kenneth J. Moore, R. L. Hintz, M. H. Wiedenhoeft, E. Charles Brummer, M. Peter Hoffman Jan 2002

Pasture Enhancement Of Warm-Season Grass Pastures Using A Complex Mixture Of Legumes, I. S. Braden, Kenneth J. Moore, R. L. Hintz, M. H. Wiedenhoeft, E. Charles Brummer, M. Peter Hoffman

Iowa State Research Farm Progress Reports

The main goal of pasture management is to balance forage supply with livestock requirements. By establishing warm-season grasses in conjunction with cool-season pastures, the overall efficiency of forage growth is improved for livestock production. Legume establishment in these pastures can enhance the overall efficiency of the pastures because the addition of legumes to the warm-season grass mixtures can help to improve forage quality and reduce the amount of nitrogen fertilizer that is needed.


Dairy Heifer Growth And Performance On Grass Pasture, Lee H. Kilmer, N. Jay Beck Jan 2002

Dairy Heifer Growth And Performance On Grass Pasture, Lee H. Kilmer, N. Jay Beck

Iowa State Research Farm Progress Reports

The dairy industry in Iowa is undergoing a dramatic transformation, with many producers remodeling or building new facilities in order to expand their herd size. And during the past five years, many large herds—in excess of 1,000 cows—have been established in Iowa. Many of these operations focus on the milking cows and rely on others to provide replacement of heifers. Southern Iowa has an abundance of grass pastures that could provide an economical feed source for growing replacement dairy heifers. Objectives of this project were to measure performance and determine the economics of gain of pregnant dairy ...


Managing Fat – The Future Of The Beef Industry, Gene H. Rouse, Doyle E. Wilson Jan 2002

Managing Fat – The Future Of The Beef Industry, Gene H. Rouse, Doyle E. Wilson

Iowa State Research Farm Progress Reports

Beef cattle are an important link in the food chain. These ruminants can turn roughage and by-products into highly digestible complete protein, energy, minerals, and vitamins.