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A single treatment with bovine somatotropin (bST) was administered at the time of insemination to repeat-breeding Holstein cows to test its effect on conception rate. A total of 316 cows with at least three unsuccessful previous services were used and were randomly assigned to be treated (bST; n=175) or not (control; n=141) with 500 mg of bST administered subcutaneously at the time of artificial insemination. Pregnancy was confirmed by transrectal palpation 45 ± 3 d after insemination. The effect of bST treatment on serum IGF-I and progesterone concentrations was determined in daily blood samples from the day of insemination to d 10 post-insemination, in seven cows per group. Treatment with bST increased conception rate [81/175 (46 %) vs 49/141 (35 %)]; P<0.01). Treatment with bST increased IGF-1 concentrations (P<0.001). Serum progesterone concentrations did not differ (P=0.68) between groups. In conclusion, a single bST treatment at the time of insemination increased conception rate in repeat-breeding Holstein cows.

Porcentaje de concepción en vacas Holstein repetidoras tratadas con somatotropina bovina al momento de la inseminación Conception rate in repeat-breeding Holstein cows treated with bovine somatotropin at the time of insemination