Abstract # 7991 Poster # 19:

Scheduled for Saturday, August 26, 2017 06:00 PM-08:00 PM: (National Ballroom AB) Poster Presentation


S. P. Flemming1, R. J. Adams1,2 and E. K. Hutchinson1,2
1Johns Hopkins School of Medicine, Research Animal Resources, Baltimore, MD 21205, USA, 2Johns Hopkins University School of Medicine, Department of Molecular and Comparative Pathobiology
     The Johns Hopkins University began developing an SPF Indian-origin rhesus macaque breeding colony in the early 1990’s to provide the University with a source of SPF Indian-origin rhesus. A shortage of breeding males resulted in harem groups either being combined, which often resulted in severe aggression and injuries, or harems went without a breeding male, negatively impacting the overall birth rate. To increase the percentage of females with access to adult males, we established a procedure of allowing five males to each access two harems throughout the breeding season. Our newly established procedure eliminated the need to combine harem groups and allowed greater amounts of females access to males; however, it was unclear whether this rotation would affect each male’s “sire conception rate” (SCR). Here we compared each male’s SCR for one to three years prior to establishing the alternating schedule to their SCR over two to three years during which each male was given access to two harems. The mean SCR in single-harem breeding seasons was 70.1% and 69.9% during alternating-harem breeding seasons, a statistically insignificant difference (p=0.974). SCR was stable across both conditions despite males accessing an average of 4.4 additional females during alternating-harem breeding seasons, producing an average of 4.2 additional offspring. This demonstrates that alternating males between harems is an effective breeding management tool in the face of limited male stock.