Abstract
One hundred Suffolk and cross-bred ewes were implanted with norgestomet/silicone implants to assess efficacy and utility, and to determine factors affecting norgestomet diffusion. The overall estrus and lambing responses were 90% and 67%, respectively. Administration of the implant for 14 days during pregnancy, in conjunction with progesterone determination on the 14th day, permitted the diagnosis of pregnancy status with 100% accuracy. Norgestomet implantation had no adverse effects on established pregnancy. Implants that were movable in situ on the 14th day had less connective tissue encapsulation and a higher (p < 0.05) norgestomet diffusion rate than implants that had rigid subcutaneous placement and more connective tissue encapsulation.
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