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Full-Text Articles in Life Sciences
Winter Grazing Management, Stephen K. Barnhart, James R. Russell, Douglas L. Karlen, Michael J. Tidman
Winter Grazing Management, Stephen K. Barnhart, James R. Russell, Douglas L. Karlen, Michael J. Tidman
Douglas L Karlen
Why winter grazing? Beef cow herd and sheep flock records show that winter feeding costs are livestock producers' single largest production expense. Managing through winter weather while keeping feeding costs low is an essential part of maintaining a profitable operation. Iowa's climate generally allows forage growth only during a 7-to-8 month period. Extending the grazing of this forage--even an extra 3 or 4 weeks in late autumn and winter--is an economical way to maintain or increase livestock profitability. Some producers extend the grazing season by using stockpiled forage, whereas others use crop residue, and many combine the use of stockpiled …
Effects Of Corn Crop Residue Grazing On Soil Physical Properties And Subsequent Soybean Production In A Corn-Soybean Crop Rotation (A Progress Report), Justin Clark, James R. Russell, Douglas Karlen, Darrell Busby, L. James Secor, Brian Peterson, Larry Pellack, Carroll Olsen, Shawn C. Shouse
Effects Of Corn Crop Residue Grazing On Soil Physical Properties And Subsequent Soybean Production In A Corn-Soybean Crop Rotation (A Progress Report), Justin Clark, James R. Russell, Douglas Karlen, Darrell Busby, L. James Secor, Brian Peterson, Larry Pellack, Carroll Olsen, Shawn C. Shouse
Douglas L Karlen
The highest cost to beef cow-calf producers is the feeding of stored feeds in winter months. To lower feed costs, many producers will try to extend the grazing season into the winter. The primary resource for winter grazing in the Midwest is corn crop residues. On the average, corn crop residue grazing will reduce the amount of hay needed to maintain cows by approximately one-half ton per acre grazed over the winter. Although crop residue grazing is quite effective in reducing feed costs, some producers are concerned that corn residue grazing will have an adverse effect on soybean yields the …
Winter Grazing Of Corn Residues: Effects On Soil Properties And Subsequent Crop Yields From A Corn-Soybean Crop Rotation, W. Darrell Busby, James R. Russell, Douglas L. Karlen, L. James Secor, Brian Peterson, Carroll Olson, Shawn C. Shouse, Dallas L. Maxwell
Winter Grazing Of Corn Residues: Effects On Soil Properties And Subsequent Crop Yields From A Corn-Soybean Crop Rotation, W. Darrell Busby, James R. Russell, Douglas L. Karlen, L. James Secor, Brian Peterson, Carroll Olson, Shawn C. Shouse, Dallas L. Maxwell
Douglas L Karlen
Corn residues could be a good resource for winter cattle grazing. The study investigates whether winter grazing causes soil compaction and yield reduction in crops that are planted following grazing.
Beef Cattle Breeding Project Progress Report: Growth-Trait Epds For 1998- And 1999-Born Calves, Abebe T. Hassen, Doyle E. Wilson, Gene H. Rouse, Richard G. Tait Jr.
Beef Cattle Breeding Project Progress Report: Growth-Trait Epds For 1998- And 1999-Born Calves, Abebe T. Hassen, Doyle E. Wilson, Gene H. Rouse, Richard G. Tait Jr.
Richard G. Tait Jr.
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 the Rhodes (central Iowa) and McNay (southern Iowa) research and demonstration farms.
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
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
Richard G. Tait Jr.
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).
Beef Cattle Breeding Project Progress Report: Body Composition Epds Determined From Ultrasound Measures, Doyle E. Wilson, Abebe T. Hassen, Gene H. Rouse, Richard G. Tait Jr.
Beef Cattle Breeding Project Progress Report: Body Composition Epds Determined From Ultrasound Measures, Doyle E. Wilson, Abebe T. Hassen, Gene H. Rouse, Richard G. Tait Jr.
Richard G. Tait Jr.
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.
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.
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.
Richard G. Tait Jr.
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.
Body Composition Changes In Bulls From Weaning Age To Yearling Age: Muscle Fat Deposition, Gene H. Rouse, Richard G. Tait Jr., M. Anderson, Abebe Hassen
Body Composition Changes In Bulls From Weaning Age To Yearling Age: Muscle Fat Deposition, Gene H. Rouse, Richard G. Tait Jr., M. Anderson, Abebe Hassen
Richard G. Tait Jr.
With the advent of real-time ultrasound, repeated measures of body composition changes, such as fat cover, rib eye area, and percentage intramuscular fat have greatly added to our understanding of beef cattle growth and development.
Effects Of Calf Age And Dam Age On Circulating Bvdv Ii Antibody Levels Prior To Vaccination In Angus Weanling Calves, Erika Diane Downey, Richard G. Tait Jr., Mary Sue Mayes, Dorian J. Garrick, Julia Ridpath, James M. Reecy
Effects Of Calf Age And Dam Age On Circulating Bvdv Ii Antibody Levels Prior To Vaccination In Angus Weanling Calves, Erika Diane Downey, Richard G. Tait Jr., Mary Sue Mayes, Dorian J. Garrick, Julia Ridpath, James M. Reecy
Richard G. Tait Jr.
Newborn calves passively acquire antibodies from their dams via consumption of colostrum immediately after birth. Colostrum quality and quantity may differ by dam age affecting the amount of circulating maternally derived antibodies. The objective of this study was to evaluate if there are differences in calf titers of maternal antibodies based on age of dam and age of calf. This knowledge is important for determining vaccination strategies because passively acquired antibodies for bovine viral diarrhea virus I and II (BVDV) have been shown to block the ability of calves to develop their own specific immune response to BVDV.
Correlations Between Carcass Traits And Mineral Concentrations In Angus Beef Raised In Iowa, Richard G. Tait Jr., Qing Duan, Qi Liu, Mary Sue Mayes, Donald C. Beitz, James M. Reecy
Correlations Between Carcass Traits And Mineral Concentrations In Angus Beef Raised In Iowa, Richard G. Tait Jr., Qing Duan, Qi Liu, Mary Sue Mayes, Donald C. Beitz, James M. Reecy
Richard G. Tait Jr.
Beef is a nutritious food that is known to have high bioavailability for several minerals such as iron and zinc. Although beef is typically high in these nutrients, there is much animalto-animal variation in mineral contents. The objective of this study is to report the relationship between traditional carcass traits and mineral concentrations within the longissimus dorsi.
Ibk (Pinkeye) In Black Angus Cattle, Jose E. Rodriguez, Abebe Hassen, Richard G. Tait Jr., James M. Reecy
Ibk (Pinkeye) In Black Angus Cattle, Jose E. Rodriguez, Abebe Hassen, Richard G. Tait Jr., James M. Reecy
Richard G. Tait Jr.
Infectious Bovine Keratoconjunctivitis (IBK), commonly known as pinkeye, is a contagious bacterial disease that affects cattle worldwide. IBK is characterized by excessive tearing, inflammation of the conjunctiva, and ulceration of the cornea. In severe cases, perforation of the cornea may occur, leading to permanent blindness. The incidence rates reported in the ISU beef herd range from 30–52% in the last four years(Figure 1). As a result of the economic impact of pinkeye in the cattle industry, estimated at $150 million/year, the lack of effective treatments against the disease and the increased demand for‘organic’ products, research in the area of disease …