Comparison Between Intracornual Artificial Insemination and Uterine Body Deposition in Holstein-Friesian Heifers.

Abstract

Two insemination types were compared: intracornual and uterine body deposition in 40 Holstein-Friesian heifers in the province of Azuay, Cuenca Region, Cumbe and Victoria Portete Parishes. The animals were over 18 months old, weighing more than 300 kg; physical condition score of 2.5-3.5, and similar management and hygiene cond i-tions. Each treatment was randomized in 4 blocks with 5 heifers each. Functional corpus luteum was determined by ultrasound scanning. PGF2α (250 mcg d-cloprostenol) was used for estrus synchronization. Estrus occurred at 48 and 72 h, and the size of the pre-ovulatory follicle was measured. Then, the two techniques were used to inseminate the animals. Gynecological checkup was performed 30 days after to assess pregnancy percent. Uterine body deposition was 35 %, whereas intracornual deposition was significantly higher (70 %).

Keywords

• reproduction
• dairy cattle
• artificial insemination
• pgf2α