The Bull Breeding Soundness Examination and Its Application in the Production Setting [0.03%]
公牛繁育适应性检查及其在生产中的应用
E Heath King,Richard M Hopper
E Heath King
breeding soundness for several reasons and at several times during their life span. These include before sale for the reason of affirming their sale ability or before a breeding season to determine their readiness for breeding. Bulls may al...
Chance L Armstrong,Aubrey N Baird
Chance L Armstrong
Abnormalities of the bovine scrotum and testes are an important cause of infertility. Proper evaluation of the male reproductive system is a critical first step in screening for such abnormalities. Excessive periscrotal fat, cutaneous scrot...
Chance L Armstrong,Aubrey N Baird
Chance L Armstrong
The inability of a bull to reproduce due to its inability to impregnant fertile cows is called impotentia generandi. This infertility may be due to the inability to achieve erection, the inability to complete coitus, or the inability to pro...
Ky G Pohler,Ramiro Vander Oliveira Filho
Ky G Pohler
For over a century, scientists have attempted to develop techniques to accurately predict the fertility potential of a male's semen sample. In most livestock species, the sire is responsible for multiple pregnancies per year and up to hundr...
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 ...