Effects of temperament on pregnancy rates to fixed-timed AI in Bos indicus beef cows》.pdf

Livestock Science 142 (2011) 108–113 Contents lists available at ScienceDirect Livestock Science journal homepage: www.e lsevier. com/ locate/ livsci Effects of temperament on pregnancy rates to fixed-timed AI in Bos indicus ☆ beef cows R.F. Cooke a,⁎, D.W. Bohnert a, M. Meneghetti b, T.C. Losi c, J.L.M. Vasconcelos d a Oregon State University, Eastern Oregon Agricultural Research Center, Burns, OR, USA b Pfi zer Animal Health, São Paulo, SP, Brazil c Lageado Consultoria Agropecuária, Mineiros, GO, Brazil d São Paulo State University, Department of Animal Production, Botucatu, SP, Brazil a r t i c l e i n f o a b s t r a c t Article history: The objective of the present experiment was to assess the effects of temperament on pregnancy Received 8 June 2011 rates to fixed-time AI (FTAI) in Bos indicus beef cows. A total of 761 multiparous lactating Received in revised form 28 June 2011 Nelore cows, originated from 4 different commercial cow–calf ranches, were evaluated for BCS Accepted 30 June 2011 and temperament at the time of FTAI (day 0). Temperament was assessed by chute score and exit velocity. Further, individual exit score was calculated by dividing exit velocity results into Keywords: quintiles and assigning cows with a score from 1 to 5 (exit score: 1=slowest cows; 5=fastest Bos indicus cow). Temperament scores were calculated by averaging cow chute score and exit score. Cows