Pregnancy rate in cows and heifers bred to bulls selected for semen quality |
| |
| Affiliation: | 1. Department of Animal Science, Brigham Young University, Provo, UT 84602 USA;2. King Ranch, Kingsville, TX 78363 USA;1. Laboratory of Neurobiology, Instituto de Biología y Medicina Experimental-CONICET, Vuelta de Obligado 2490, C1428ADN Buenos Aires, Argentina;2. Depto. de Bioquímica Humana, Facultad de Medicina, Universidad de Buenos Aires, Paraguay 2155, C1121ABG Buenos Aires, Argentina;1. The Ohio State University, Department of Animal Science, Columbus, OH 43210, USA;2. Select Sires, Inc., Plain City, OH 43064, USA;3. University of Wyoming, Department of Animal Science, Laramie, WY 82071, USA;1. Laboratory of Reproductive Biology, Division of Animal Science, Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University, Japan;2. Hokubu Agricultural Institute, Hyogo Prefectural Technology Center for Agriculture, Forestry and Fisheries, Japan;1. Department of Medicine and Animal Surgery, Faculty of Veterinary Science, University of Murcia, Spain;2. Department of Clinical & Experimental Medicine (IKE), Linköping University, Sweden;1. Servicio de Farmacia. Hospital Universitario Puerta de Hierro.;2. Servicio de Farmacia. Dirección Asistencial Noroeste. Madrid. España. |
| |
| Abstract: | A two-year study was conducted to compare fertility in cows or heifers bred to either an unselected group of bulls or bulls selected for semen quality. An improvement of 5% in pregnancy rate was found the first year in 591 cows bred to bulls having 80% or more normal sperm, compared to the 656 cows bred to a group of bulls representative of the original population (original group). A similar difference in pregnancy rate was noted the second year between 1179 heifers bred to the original group of bulls and the 522 heifers bred to bulls having 80% or more normal sperm and the 769 heifers bred to bulls with 70% or more normal sperm. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
