Behavioral Characteristics of Bos indicus Cattle after a Superovulatory Treatment Compared to Cows Synchronized for Estrus

  • Jimenez, A. (Department of Animal Reproduction and Artificial Insemination, Faculty of Veterinary Medicine and Animal Science, National Autonomous University of Mexico) ;
  • Bautista, F. (Department of Animal Reproduction and Artificial Insemination, Faculty of Veterinary Medicine and Animal Science, National Autonomous University of Mexico) ;
  • Galina, C.S. (Department of Animal Reproduction and Artificial Insemination, Faculty of Veterinary Medicine and Animal Science, National Autonomous University of Mexico) ;
  • Romero, J.J. (School of Veterinary Medicine, Universidad Nacional) ;
  • Rubio, I. (Centre for Education, Research and Extension in Tropical Animal Husbandry Faculty of Veterinary Medicine and Animal Science, National Autonomous University of Mexico)
  • Received : 2011.02.09
  • Accepted : 2011.06.02
  • Published : 2011.10.01


The intensity and duration of sexual behavior in Bos indicus was assessed through the continuous observation of sexual receptivity. Two groups of cows were formed: only synchronized (n = 50) and other group further superovulated (n = 20). An intravaginal implant that released progesterone over 9 d was used. After removing the implant, 25 mg of $PGF_{2{\alpha}}$ was administered. In the superovulated group, the administration of 280 mg (Follicle stimulant hormone) FSH-P1 per cow with a decreasing dosage over 4 d was utilized. In both groups, behavioral observations began at the moment of implant removal. Sexual behavior was analyzed using a Kruskal-Wallis test to compare the mean of hours in estrus, effective mountings and number of mounts/hour during estrus. A nonparametric survival analysis was performed using the time in two ways: i) when an event happened it was placed in a 24 h timeframe and, ii) the time of observation in continuous form (96 h) assessing the difference between curves by the log rank test Chi-square. The only significant difference was the number of mounts/h during receptivity (p<0.05). In the superovulated group three periods of sexual activity during the day were identified, with these events being of greater frequency and duration than the synchronized group (p = 0.02); besides, the superovulated group began estrus before the synchronized group (p = 0.0035) when using the total period. In a simulation study, when the number of observations went from two (06:00-18:00) to three periods (06:00, 12:00 and 18:00) cows detected accurately (<6 h after the onset) increased more than 20%. The results show that superovulated cows presented greater intensity and duration of sexual activity in contrast with only synchronized animals.


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