caa a22 4500 388060557 CHVBK 20180307125119.0 cr unu---uuuuu 161130e199804 xx s 000 0 eng 10.1017/S1357729800009541 doi S1357729800009541 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800009541 Competitive ability of rams selected for high and low levels of sexual performance [Elektronische Daten] The objective of this study was to determine any differences in the competitive ability of rams differing in levels of sexual performance. Twenty sexually experienced Targhee-type rams were preselected from a population of 95 males for exhibiting relatively high and low ejaculation rates when individually exposed to oestrous ewes for 30 min. Each of 10 high performers (HP) were paired with each of 10 low performers (LP) on three occasions when competing for food (after food deprivation) and twice when competing for an oestrous female. Tests were 5 min in duration. Food-deprived HP and LP rams were equally aggressive when competing for a source offood that could only be accessed by one ram at a time. Time offeeding by HP and LP rams did not differ. HP rams spent more time with the oestrous ewe and attained more mounts in a greater number of pairings than LP rams even though HP and LP rams did not differ in number of successful agonistic interactions (active displacements and successful defences) when competing for the ewe. It was concluded that HP and LP rams, taken as groups, do not differ in their basic competitive ability and that the greater mating success of HP rams can be explained by their higher levels of libido. Copyright © British Society of Animal Science 1998 competitive ability nationallicence libido nationallicence ram nationallicence sexual behaviour nationallicence sheep nationallicence Erhard H. W. Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8QH Price E. O. Department of Animal Science, University of California, Davis, CA 95616-8521, USA Dally M. R. Hopland Research and Extension Center, 4070 University Road, Hopland, CA 95449, USA Animal Science Cambridge University Press 66/2(1998-04), 403-408 1357-7298 66:2<403 1998 66 ASC https://doi.org/10.1017/S1357729800009541 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800009541 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Erhard H. W. Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8QH NATIONALLICENCE 700 1- Price E. O. Department of Animal Science, University of California, Davis, CA 95616-8521, USA NATIONALLICENCE 700 1- Dally M. R. Hopland Research and Extension Center, 4070 University Road, Hopland, CA 95449, USA NATIONALLICENCE 773 0- Animal Science Cambridge University Press 66/2(1998-04), 403-408 1357-7298 66:2<403 1998 66 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge