Document Type : Original Article
Authors
1
Animal Production Department, Faculty of Agriculture, Menoufia University, Egypt
2
Animal Production Department, Faculty of Agriculture, Menoufia University, EGYPT.
Abstract
The Study compared two synchronized estrus protocols for the treatment of cycling and non-cycling Holstein dairy cattle. The experiment included two farms belonging to El-Bayoumi’s dairy farms located at Zayan Village, Belqas, Dakahlia, Egypt (GPS: 31.4412° N, 31.5364° E). 916 and 1467 Holstein cows were treated with hormone-based protocols, and 2849 and 2435 animals were bred based on standing heat detection, making the overall total 3765 and 3902 animals for Farm-1 and Farm-2, respectively. In Farm 1, 335 cows were treated with PG, resulting in a 20.3% conception rate (CR), 71.6% open rate (OP), 3.3% abortion rate (AB), and an average NSPC of 4.5.
In contrast, 621 cows under CIDR‑Sync achieved 23.8% CR, 64.9% OP, 6.4% AB rate, and a lower NSPC of 3.7. Across both protocols, CIDR‑Sync accounted for approximately 65% of all pregnancies. In Farm 2, 996 PG-treated cows had a 17.8% CR, 77.6% OP rate, 2.7% AB rate, and NSPC of 5.4, whereas 428 CIDR‑Sync cows reached a 19.9% CR, 74.5% OP rate, 4.9% AB rate, and NSPC of 4.8. CIDR‑Sync contributed about 30% of total pregnancies in Farm 2. In both farms, CIDR‑Sync produced modest gains in conception rates (≈2–3.5%) and improved insemination efficiency (≈0.7–1 fewer service), albeit with slightly higher abortion rates. In conclusion, the CIDR-enhanced synchronization program outperforms PGF₂α alone by modest but economically significant margins. Dairy operations, especially those facing challenges with silent estrus or suboptimal progesterone (P4) levels, may therefore derive substantial reproductive benefits from adopting the CIDR-Sync protocol
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