ArticleTropical animal health and production2026
Effects of eCG dose and timing on estrus and ovulation in hair ewe-lambs of three breeds under dry-tropical conditions across two breeding seasons.
Article in Tropical animal health and production, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study evaluated the effects of equine chorionic gonadotropin (eCG) dose and application timing after progestogen-sponge removal on estrus characteristics and ovulation rate in ewe‑lambs of three hair‑sheep breeds under dry-tropical conditions. Two hundred sixteen ewe‑lambs (62 Dorper, 69 Katahdin, 85 Pelibuey; 8-10 months old) were studied during a high (n = 91) and a low (n = 125) breeding season. Animals received intravaginal progestogen sponges (Cronolone, 20 mg) for 12 days and were assigned to a 2×2 factorial treatment: eCG 200 IU or 300 IU administered either 24 h before (-24 h) or at sponge withdrawal (0 h). Estrus signs (mount acceptance and vulvar swelling) were recorded every 4 h for 48 h; ovulation was confirmed by laparoscopic corpora lutea (Cl) count eight days later. Overall, 82% of ewe‑lambs exhibited estrus within 48 h. There were no main effects of eCG dose or application time on overall estrus rate. A significant dose×time interaction affected interval to estrus (P = 0.012): mean interval was shorter after -24 h application (30.2 ± 1.0 h) than after 0 h application (34.6 ± 1.0 h). Breed influenced estrus expression and silent ovulation: Dorper ewe‑lambs were more likely to exhibit estrus than Pelibuey (odds ratio (OR) = 9.74, 95% confidence interval (CI) = 1.93-49.19; P = 0.0059) and had lower silent ovulation (3.4% vs. 24.7%; OR = 0.56, 95% CI = 0.02-0.59; P = 0.0094). Mean ovulation rate exceeded 95% across groups and was higher for Pelibuey (2.4 ± 0.1 Cl) than Dorper (2.0 ± 0.1 Cl) and Katahdin (1.9 ± 0.1 Cl; P < 0.05). Under the conditions tested, administering 300 IU eCG at -24 h sponge removal provided a practical balance for synchronized estrus and high ovulation rates across seasons.
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