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Progesterone-based estrous synchronization protocols in non-suckled and suckled primiparous Bos indicus beef cows
O G Sá Filho1, C C Dias, G C Lamb
1Departamento de Produção Animal, Faculdade de Medicina Veterinária e Zootecnia-UNESP, Botucatu-SP 18618-000, Brazil.
Estrus synchronization in beef cows using intravaginal progesterone inserts (CIDR) and prostaglandin F(2alpha) improved insemination and pregnancy rates. Adding equine chorionic gonadotropin (eCG) further enhanced these outcomes in suckled cows.
Area of Science:
- Reproductive endocrinology in livestock
- Animal breeding and genetics
- Veterinary science
Background:
- Estrus synchronization is crucial for efficient beef cattle reproduction.
- Primiparous Bos indicus cows present unique reproductive challenges.
- Optimizing breeding programs enhances herd productivity.
Purpose of the Study:
- To evaluate the efficacy of intravaginal progesterone inserts (CIDR) combined with prostaglandin F(2alpha) (PGF) for estrus synchronization in non-suckled primiparous Bos indicus cows.
- To assess the impact of equine chorionic gonadotropin (eCG) on estrus synchronization and pregnancy rates in suckled primiparous Bos indicus cows when combined with CIDR, PGF, and temporary weaning (TW).
Main Methods:
- Experiment 1: Non-suckled cows received Control, PGF, or CIDR + PGF treatments.
- Experiment 2: Suckled cows received Control, CIDR + PGF + TW, CIDR + PGF + TW + eCG (200 or 400 IU) treatments.
- Estrus detection and pregnancy rates were assessed over 4-day and 30-day breeding seasons.
Main Results:
- CIDR + PGF significantly increased insemination and pregnancy rates in non-suckled cows compared to controls.
- CIDR + PGF + TW treatments, especially with eCG, improved insemination and pregnancy rates in suckled cows.
- eCG association with CIDR + PGF + TW enhanced estrous detection and pregnancy rates in suckled cows; dosage did not affect outcomes.
- Synchronization treatments led to higher insemination and pregnancy rates over a 30-day breeding season.
Conclusions:
- Intravaginal progesterone inserts (CIDR) combined with PGF are effective for estrus synchronization in non-suckled primiparous Bos indicus cows.
- Equine chorionic gonadotropin (eCG) can improve reproductive outcomes when used with CIDR, PGF, and temporary weaning in suckled primiparous Bos indicus cows.
- Estrus synchronization protocols enhance reproductive efficiency in primiparous Bos indicus beef cattle.
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