Factors affecting reproductive response in anestrous crossbred cows treated with intravaginal progesterone or calf removal for 120 hours

  • Fernando Pedro Perea Ganchou Universidad de los Andes, Trujillo
  • Roberto Palomares Naveda La Universidad del Zulia, Maracaibo
  • Aitor De Ondiz La Universidad del Zulia, Maracaibo
  • Hugo Hernández Fonseca La Universidad del Zulia, Maracaibo
  • Doraida Díaz Universidad de los Andes, Trujillo
  • Rumualdo González Venezolana de Inseminación Artificial y Transplante de Embriones (VIATECA). Villa del Rosario
  • Germán Portillo La Universidad del Zulia, Maracaibo
  • Eleazar Soto Belloso Venezolana de Inseminación Artificial y Transplante de Embriones (VIATECA). Villa del Rosario. Venezuela

Abstract

To study the effect of season (August-October, EP1; February- March, EP2), predominant breed (Bos taurus, BT; Bos indicus, BI), and number of parturitions (primiparous, PC; multiparous, MC) on reproductive response, 167 crossbred anestrous cows that were 90 to 130 d postpartum were allotted randomly to one of the following treatments: IP (n = 59), intravaginal sponge with 250 mg of medroxyprogesterone acetate (MAP) for 7 d; first day of treatment (Day 0), 50 mg MAP and 5 mg 17B-estradiol (17B-E) intramuscular (im); Day 5, 500 IU of eCG; 24 h after sponge removal (Day 8), 1.5 mg 17B-E im. CR (n = 57), temporary calf removal for 120 h. CG (n = 51), control group without treatment. Data were analyzed using Chi-square and GLM procedures. Season did not affect the reproductive response under the IP treatment; however, in EP2 cows under CR and/or CG had better reproductive response than in EP1: estrous rate (ER) was: CG: 36.8 vs 13.8%, respectively (P < 0.06), pregnancy rate at 30 d (TP30): CR: 40 vs 16.6%, (P < 0.02) and CG: 26.3 vs 3.4%, respectively (P < 0.06), pregnancy rate at 60 d (TP60): CR: 55 vs 23.3%, respectively (P < 0.02), interval parturition to 1st service (PFS): CG: 146.6 vs 181.8 d, respectively (P < 0.01), and interval parturition to conception (PCI): CR: 135.8 vs 156.7 d, (P < 0.05) and CG: 147.1 vs 171.1 d, respectively (P < 0.05). Predominant breed did not affect the reproductive response within any of the experimental group, except that under IP, BI cows had a greater TP60 than BI (62.5 vs 43.5%; P < 0.05). Primiparous cows under CR had lower ER than multiparous (39.5% vs 68.2%; P < 0.05); whereas in CG TP60 was 3.5 times lower in PC than in MC cows (7.7 vs 27.3%; P < 0.07). Also, in CG the PFS was shorter in MC than PC cows (153.8 vs 173.7 d; P < 0.05). Overall, the IP treatment followed by CR gave greater estrous rate, accumulated pregnancy at 30 and 60 d post-treatment and reestablished pregnancy in a shorter period after calving than the non-treatment control.

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Published
2010-09-29
How to Cite
Perea Ganchou, Fernando Pedro, Roberto Palomares Naveda, Aitor De Ondiz, Hugo Hernández Fonseca, Doraida Díaz, Rumualdo González, Germán Portillo, and Eleazar Soto Belloso. 2010. “Factors Affecting Reproductive Response in Anestrous Crossbred Cows Treated With Intravaginal Progesterone or Calf Removal for 120 Hours”. Latin American Archives of Animal Production 17 (1-2). https://ojs.alpa.uy/index.php/ojs_files/article/view/617.
Section
Original paper