Arthur Lee Jones
Arthur Lee Jones
As approximately 94% of beef cow-calf operations use only natural service for breeding their cows and heifers, replacement bulls are a significant, necessary cost of producing beef calves. The value realized from beef bulls includes number ...
Joe C Paschal,A Lee Jones
Joe C Paschal
Physical evaluation of beef bulls is important in determining their ability to be long-lived useful breeding animals. A basic examination should include an assessment of the bull's conformation, gait, and overall appearance. Skeletal soundn...
Gary D Warner
Gary D Warner
Lameness in bulls is a common problem seen by many veterinarians, and the cause can be difficult to determine. Understanding cattle lameness requires experience and complete knowledge of their structural anatomy and handling. This article r...
M Sofia Ortega,Kelsey N Lockhart,Thomas E Spencer
M Sofia Ortega
The use of in vitro embryo production (IVP) has increased globally, particularly in the United States. Although maternal factors influencing embryo development have been extensively studied, the influence of the sire is not well understood....
Trace Mineral Supplementation for Beef Cows: Dry Range Environment [0.03%]
肉牛微量元素补饲：干旱草原环境下的应用研究进展与实践
Bob Sager,Robert J Van Saun
Bob Sager
Range mineral supplementation is based on providing trace minerals not adequately provided from grazed forage in meeting beef cattle needs throughout life cycle stages. Supplementation programs should be developed with consideration of ranc...
Arthur Lee Jones
Arthur Lee Jones
Reproduction is essential for successful cow-calf and dairy production and the most important economic trait for cow-calf producers. For efficient reproduction to occur in beef herds, cows or heifers must conceive early during the breeding ...
Considerations for Using Natural Service with Estrous Synchronization Programs [0.03%]
关于发情控制方案中自然配种的考虑因素
George A Perry
George A Perry
Estrous synchronization, coupled with natural service, provides the benefit of female cows conceiving early, but there are an increased number of females expressing estrus in a short period of time. Thus, considerations need to be made for ...
Vitor R G Mercadante,Graham Cliff Lamb
Vitor R G Mercadante
The article discusses the importance of reproductive biotechnologies, including artificial insemination and fixed-time artificial insemination (TAI), in beef cow-calf operations. The use of TAI improves cow-calf productivity and profitabili...
Leonardo F C Brito
Leonardo F C Brito
This manuscript provides an overview of the effects of nutrition during different stages of bull sexual development. Nutrition during the prepubertal period can modulate the hypothalamic GnRH pulse generator. Increased nutrition results in ...
Joseph C Dalton
Joseph C Dalton
Artificial insemination (AI) is an effective strategy to distribute semen from elite sires and improve the genetics of a herd. Commercial studs provide a fertile semen product to their customers. Consequently, the maintenance of sire fertil...