In descending order, by date published.
9/25/2023 (new)
Authors: Les Anderson, Darrh Bullock, Ted Kalbfleisch, Jeff Lehmkuhler, Mary McCarty
The domesticated yak (Bos grunniens) arrived in North America in the late 1890s. A few animals were imported into Canada and North American zoos and became the foundation of the North American genetic pool. Research was conducted in Alaska hybridizing them with Highland cattle in the early 1900s. A handful of yaks were imported into the United States in the early 1900s and again later in the 1980s. However, the genetic diversity of the North American yak is limited, necessitating a need to manage breeding programs to reduce inbreeding.
Departments: Animal and Food Sciences, Veterinary Science
Series: Interdepartmental (ID series)
Size: 3.64 mb
Pages: 4
8/8/2023 (new)
Authors: Darrh Bullock
Genetic trends for beef breeds, for many traits, are on the move. The genetic trend for growth in most breeds is strongly positive. Maternal weaning weight (milk) on the other hand is breed dependent, with some breeds showing strong selection for increased milk and others slightly reducing their genetic potential for milking ability. For that reason, it is important to monitor relative differences between breeds for various production traits to assist beef producers in their breed selection decisions.
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 592 kb
Pages: 3
7/18/2022 (new)
Authors: Les Anderson, Darrh Bullock, Kevin Laurent, Jeff Lehmkuhler, Katherine VanValin
Beef cattle have defined requirements for vitamins. In some instances, vitamin supplementation may be necessary to avoid deficiencies. Vitamins are classified into two categories: water-soluble and fat-soluble. Water-soluble vitamins include the B vitamins, such as riboflavin, thiamin, and niacin, as well as vitamin C. Fat-soluble vitamins include vitamins A, D, E, and K. Supplementation for beef cattle generally focuses on vitamins A and E. This is because the rumen microbes synthesize the water-soluble vitamins and vitamin K in sufficient quantities to avoid deficiencies. Vitamin D requirements can often be met by exposure to the sun and would therefore only be of concern for cattle in confinement housing.
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 795 kb
Pages: 2
4/1/2021 (major revision)
Authors: Darrh Bullock
In principle, genetic improvement is a straight-forward exercise that results from using above-average selection candidates as the parents of the next generation. In practice, the devil is in the details. Both bull breeders and bull buyers need to consider their breeding objectives, defining the list of traits that need to be modified to advance the towards their goal.
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 7.30 mb
Pages: 56
3/23/2021 (major revision)
Authors: Les Anderson, Michelle Arnold, Darrh Bullock, Kenny Burdine, Roy Burris, Ben Crites, Jimmy Henning, Steve Higgins, Steve Isaacs, Kevin Laurent, Jeff Lehmkuhler, Lee Moser, Gregg Rentfrow, Kylie Schmidt, Ray Smith, Chris Teutsch, Lee Townsend, Katherine VanValin, Paul Vijayakumar
Kentucky is ideally suited for cattle production. The main feed for cattle is a renewable resource Kentucky has in abundance--forages. The majority of the state's terrain favors cattle production over row crops. Kentucky farms cover 14 million acres, with approximately half of that occupied by forage grasses and legumes. Our natural resources and climate permit the growth of most cool-season and warm-season species. Water is readily available in all areas of the state, and we have a relatively long growing season.
Departments: Agricultural Economics, Animal and Food Sciences, Biosystems and Agricultural Engineering, Entomology, Plant and Soil Sciences, Veterinary Science
Series: Interdepartmental (ID series)
Size: 4.50 mb
Pages: 164
7/2/2020 (new)
Authors: Les Anderson, Darrh Bullock, Darrell Johnson, Kevin Laurent, Jeff Lehmkuhler, Katherine VanValin
Kentucky has several bourbon distilleries and one fuel ethanol plant. The spent grains from the production of ethanol is utilized as a protein source in livestock feed. Shutdowns for fuel ethanol plants may also occur as a result of unfavorable profit margins when crude oil prices are low. Most distilleries and fuel ethanol plants will have a scheduled maintenance shutdown each year. During a shutdown, availability of distillers grains and other coproducts from these plants may be limited or unavailable. So, the question is what else can I feed in place of distillers grains?
Departments: Animal and Food Sciences, Regulatory Services
Series: Interdepartmental (ID series)
Size: 300 kb
Pages: 2
6/1/2020 (new)
Authors: Les Anderson, Darrh Bullock, Kevin Laurent, Jeff Lehmkuhler
The growth of the bourbon industry has provided an increase in distillery byproduct feedstuffs that can be utilized by cattle as a source of energy and protein. Learning the nutritional characteristics of these feedstuffs will facilitate proper feeding, allowing for improved cattle performance.
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 130 kb
Pages: 3
9/17/2019 (new)
Authors: Les Anderson, Michelle Arnold, Darrh Bullock, Jeff Lehmkuhler
Weaning is the process of separating suckling offspring from their dam. Weaning is a management procedure applied by the herd manager. Cattle are herd animals and their gregarious nature can lead to stress as a result of this separation. Managing the weaning process can aid in reducing stress for the animals and livestock managers.
Departments: Animal and Food Sciences, Veterinary Science
Series: Interdepartmental (ID series)
Size: 821 kb
Pages: 4
2/7/2014 (new)
Authors: Sean Bessin, Darrh Bullock
Expected progeny differences (EPDs) are useful tools in providing the best estimate of the genetic value of a particular animal as a parent. Differences in EPDs between parents of the same breed predict the performance differences of their future offspring if environmental factors are the same. EPD values should not be compared between breeds; for example, you should not compare an Angus bull's weaning weight EPD with a Simmental bull's weaning weight EPD. Most established breeds have EPDs for calving ease, growth, maternal, and carcass traits. When used properly, producers can make genetic improvements to their herd through parental selection. This publication is intended to help producers better understand EPDs and how one might use them in selection of replacement animals.
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 370 kb
Pages: 3
1/7/2014 (new)
Authors: Glen Aiken, Les Anderson, Darrh Bullock, Roy Burris, Lowell Bush, J.R. Bussard, Andrew Foote, Ben Goff, David Harmon, V.B. Holder, Isabelle Kagan, Nicole Kenney, D.H. Kim, S.E. Kitts, Jim Klotz, Anne Koontz, Jeff Lehmkuhler, Kyle McLeod, Jim Strickland, Eric Vanzant, Bill Witt
The intent of this report is to provide highlights of our research and extension activities. We have a vested interest in the beef industry in the state and nation, and hope this report provides a window into our programs. We believe that after viewing this report, a greater appreciation will be garnered with respect to our involvement in the multiple fields of study related to beef production. The faculty, staff and student activities are advancing our understanding of basic science principles of livestock production as well as applied research that producers and the industry can benefit from immediately, as well as in the future. Extension educational programs, on-farm demonstrations, and other activities aid in transferring this knowledge to producers, allowing for increased awareness and adoption of management change.
Departments: Animal and Food Sciences, Plant and Soil Sciences, USDA-ARS
Series: Special Report (SR series)
Size: 975 kb
Pages: 40
3/11/2011 (new)
Authors: Les Anderson, Darrh Bullock, Roy Burris, Lowell Bush, Blair Knight, Kevin Laurent, Jeff Lehmkuhler, Jim Matthews, Kyle McLeod, Lori Porter, Jim Randolph, Gregg Rentfrow, Keith Schillo, Meg Steinman, Jim Strickland, Laurentia van Rensburg, Eric Vanzant
The 2010 Research and Extension Beef Report highlights advances in understanding of basic scientific principles of livestock production as well as applied research from which producers and the industry can benefit. Extension educational programs, on-farm demonstrations, and other activities help transfer this knowledge to producers so they can adopt of management changes as appropriate.
Departments: Animal and Food Sciences, Plant and Soil Sciences, UK Veterinary Diagnostic Lab, USDA-ARS
Series: Special Report (SR series)
Size: 2.10 mb
Pages: 89
2/10/2011 (major revision)
Authors: Darrh Bullock
One of the most important decisions a cattle operator makes is selecting breeding animals to go into the cattle herd. Basing that decision on the genetic merit of the animal, not just the outward appearance, is critical to the herd's long-term performance.
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 248 kb
Pages: 4
11/1/2004 (new)
Authors: Les Anderson, Darrh Bullock
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 442 kb
Pages: 5
6/1/2004 (new)
Authors: Jim Akers, Les Anderson, Darrh Bullock, Kenny Burdine, Roy Burris, Paul Deaton, David Harmon, Bruce Hightshoe, John Johns, Jim Matthews, Kyle McLeod, Lee Meyer, Melissa Newman, Jim Randolph, Patty Scharko, Keith Schillo, Alison Smith, Laurentia van Rensburg, Eric Vanzant
Departments: Agricultural Economics, Agriculture and Natural Resources, Animal and Food Sciences, Veterinary Science
Series: Special Report (SR series)
Size: 481 kb
Pages: 43
12/22/2003 (new)
Authors: Les Anderson, Darrh Bullock, Roy Burris, John Johns
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 86 kb
Pages: 2
2/1/2003 (reprinted)
Authors: Darrh Bullock, Roy Burris, John Johns, Dave Patterson
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 320 kb
Pages: 4
2/1/2003 (reprinted)
Authors: Les Anderson, Darrh Bullock, Roy Burris, John Johns
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 158 kb
Pages: 6
2/1/2003 (reprinted)
Authors: Les Anderson, Darrh Bullock, Roy Burris, John Johns
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 23 kb
Pages: 2
2/1/2003 (reprinted)
Authors: Les Anderson, Darrh Bullock, Roy Burris, John Johns
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 66 kb
Pages: 4
9/30/2002 (new)
Authors: Darrh Bullock
Departments: Animal and Food Sciences
Series: Progress Report (PR series)
Size: 519 kb
Pages: 54
9/30/2000 (new)
Authors: Darrh Bullock
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 78 kb
Pages: 4
6/1/2000 (minor revision)
Authors: Les Anderson, Darrh Bullock
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 243 kb
Pages: 3
10/1/1999 (new)
Authors: Debra Aaron, Les Anderson, Darrh Bullock, Roy Burris, Dwayne Edwards, Don Ely, Bob Harmon, Jimmy Henning, Bruce Hightshoe, Terry Hutchens, John Johns, Garry Lacefield, Kevin Laurent, Jim Matthews, Kyle McLeod, Jim Randolph, Monroe Rasnake, Patty Scharko, Keith Schillo, Scott Shearer, Larry Turner, Dwight Wolfe, Steve Workman
Departments: Animal and Food Sciences, Biosystems and Agricultural Engineering, Horticulture, Plant and Soil Sciences, Veterinary Science
Series: Progress Report (PR series)
Size: 4 kb
Pages:
7/30/1998 (new)
Authors: Darrh Bullock, Richard Coffey, Kevin Laurent, Gary Parker
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 14 kb
Pages:
3/30/1996 (reprinted)
Authors: Darrh Bullock, Kevin Laurent
Departments: Animal and Food Sciences
Series: Animal Science (ASC series)
Size: 145 kb
Pages: 2
