Participating Faculty

Andy Roberts

Andy Roberts

Credentials:1988 - Ph.D. Washington State University;­ Animal Sciences
Office:Fort Keogh LARRL
Mailing Address:USDA-ARS, Fort Keogh LARRL
243 Fort Keogh Road
Miles City, MT 59301-4016
Website:Click here

Research Interests

Develop beef cattle better suited for sustainable production

Research Summary

The long-term goal of research is to determine physiological processes by which genetic and environmental factors influence reproduction, thereby facilitating the ability to match cattle genotype with production environment. Research utilizes genomic, functional genomic and physiological approaches to identify key genes involved in controlling reproductive processes and determine how nutrition interacts with these genes to influence reproduction in cattle. Knowledge from this research is expected to result in the development of management and selection strategies that improve fertility and efficiency of beef production.

Research Publications

Toghiani S, E Hay, P Sumreddee, TW Geary, R Rekaya and A Roberts. 2017. Genomic prediction of continuous and binary fertility traits of females in a composite beef cattle breed. J. Anim. Sci. 95:4787-4795.

Roberts AJ, A Gomes da Silva, AF Summers, TW Geary, and RN Funston. 2017. Developmental and reproductive characteristics of beef heifers classified by pubertal status at time of first breeding. J. Anim. Sci. 95:5629-5636.

Hay EH, and A Roberts.  2017. Genomic prediction and genome-wide association analysis of female longevity in a composite beef cattle breed. J. Anim. Sci. 95:1467–1471.

Roberts AJ, RN Funston, EE Grings, and MK Petersen. 2016. TRIENNIAL REPRODUCTION SYMPOSIUM: Beef heifer development and lifetime productivity in rangeland-based production systems. J. Anim. Sci.  94: 2705-2715.

Funston RN, EE Grings, AJ Roberts, and BT Tibbitts. 2016.  INVITED SYMPOSIUM PAPER: Choosing a Calving Date.  Prof. Anim. Sci. 32:145–153.

Roberts AJ, MK Petersen, and RN Funston. 2015. BEEF SPECIES SYMPOSIUM: Can we build the cowherd by increasing longevity of females? J. Anim. Sci. 93:4235–4243.

Petersen MK, CJ Mueller, JT Mulliniks, AJ Roberts, T DelCurto and RC. Waterman.  2014.  Potential limitations of NRC in predicting energetic requirements of beef females within western U.S. grazing systems. J ANIM SCI 92:2800-2808.

Jinks EM, MF Smith, JA Atkins, KG Pohler, GA Perry, MD MacNeil, AJ Roberts, RC Waterman, LJ Alexander and TW Greary. 2013. Preovulatory estradiol and the establishment and maintenance of pregnancy in suckled beef cows. J. Anim. Sci. 91:1176-1185.

Endecott RL, RN Funston, JT Mulliniks and AJ Roberts. 2013. JOINT ALPHARMA-BEEF SPECIES SYMPOSIUM: Implications of beef heifer development systems and lifetime productivity. J. Anim. Sci. 91:1329-1335.

Mulliniks JT, ME Kemp, RL Endecott, SH Cox, AJ Roberts, RC Waterman, TW Geary, EJ Scholljegerdes and MK Petersen. 2013. Does β-hydroixybutyrate concentration influence conception date in young postpartum range beef cows? J. Anim. Sci. 91:2902-2909.

Funston RN, AF Summers and AJ Roberts. 2012. Implications of nutritional management for beef cow-calf systems. J. Anim. Sci. 90:2301-2307.

Funston RN, JL Martin, DM Larson and AJ Roberts. 2012. Nutritional aspects of developing replacement heifers. J. Anim. Sci. 90:1166-1171.

Roberts AJ and DJ McLean (2011). “Differential gene expression in anterior pituitary glands from anestrous and cycling postpartum beef cows.” Journal of Animal Science 89(4): 1035-1041. 

Underwood KR, JF Tong, et al. (2010). “Nutrition during mid to late gestation affects growth, adipose tissue deposition, and tenderness in cross-bred beef steers.” Meat Science 86(3):588-593.

Geary TW, RP Ansotegui, et al. (2010). “Effects of flunixin meglumine on pregnancy establishment in beef cattle.” Journal of Animal Science 88(3): 943-949.

Roberts AJ, TW Geary, EE Grings, RC Waterman and MD MacNeil. 2009. Reproductive performance of heifers offered ad libitum or restricted access to feed for a 140-d period after weaning. J. Anim. Scie. 87:3043-3052.

CG Elsik, RL Tellam, KC Worley, TA Gibbs…L. Alexander,…A. Roberts,…RC Waterman, …, MD MacNeil. 2009. The Genome Sequence of Taurine Cattle: A Window to Ruminant Biology and Evolution. Science 324:522-528.

Roberts AJ, MJ Al-Hassan, PM Fricke and SE Echternkamp. Large variation in steroid concentrations and insulin-like growth factor binding proteins exists among individual small antral follicles collected from within cows at random stages of the estrous cycle. J. Anim. Sci. 2006. 84(10):p.2714-24.

Roberts AJ, J Klindt and TG Jenkins. Effects of varying energy intake and sire breed on duration of postpartum anestrus, insulin like growth factor-1, and growth hormone in mature crossbred cows. J. Anim. Sci 2005. 83(7): p. 1705-14.

Washington State University