TY - JOUR AU - Cupps, P. T. AU - McGowan, B. AU - Rahlmann, D. F. TI - Semen quality in beef bulls: Tests with young and older bulls, based on percentages of living, motile, and abnormal sperm and breeding efficiency JF - California Agriculture JO - Calif Agr Y1 - 1959/12/01 VL - 13 IS - 12 SP - 5 EP - 6 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v013n12p5 AB - Poor quality semen can be produced by bulls of any age, but recovery in 3-6 months was found in nearly half of such bulls that could be retested.