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Evaluation of a treatment using Norgestomet implants plus PMSG for anestrus control in postpartum crossbred cows

Evaluation of a treatment using Norgestomet implants plus PMSG for anestrus control in postpartum crossbred cows

Revista Cientifica, Facultad de Ciencias Veterinarias, Universidad del Zulia 9(5): 440-445

A retrospective study was conducted, using data collected between 1993 and 1998, on 222 anoestrus crossbred cows (Bos taurus x Bos indicus) from the municipio Rosario de Perija (Zulia, Venezuela). 122 animals had been treated with Norgestomet implants (Crestar; 3 mg + 3 mg Norgestomet and 5 mg oestradiol valerate in 2 ml of solution, administered when the implant was inserted) at 9 day-intervals, plus an injection of PMSG (Folligon; 500 IU) on the day of implant removal. 100 animals had received no treatment. The variables studied were: treatment efficiency (oestrus response to induction with implants); treatment-1st service interval, treatment-conception interval, fertility at 1st service, and fertility at 2nd service. 58.2% (71/122) of the cattle in the treatment group displayed an oestrus response and 41.8% (51/122) did not; these results differed significantly from those expected for untreated cows (P<0.05). Breed (proportions of cattle and zebu inheritance), parity, and milk yield had no effect on treatment efficiency; treatment-1st service interval was 29.8+or-4.0 days in the treatment group and 55.1+or-3.8 days in the control group (P<0.001). Treatment to conception interval was 28.7+or-4.4 days for the treatment group and 70.9+or-4.7 days for the control group (P<0.001). Fertility at 1st service was 58.3 (67/115) and 54% (54/100) for the treatment and control groups respectively. Fertility at 2nd service was 60 (24/40) and 57.8% (19/45) in the treatment and control groups. Fertility at 1st and 2nd service did not differ between the treated and control groups.

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Accession: 003131086

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