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Short communication: Reproduction outcomes in dairy heifers following a 14-d progesterone insert presynchronization
C K Claypool1, J A Spencer1, S Menegatti Zoca1
1Animal and Veterinary Science Department, University of Idaho, Moscow 83844.
Presynchronization with a 14-day controlled internal drug release (CIDR) effectively improved estrus detection and pregnancy rates in dairy heifers. This method reduced days to first artificial insemination (AI) and increased heifers pregnant within seven days of eligibility.
Area of Science:
- Reproductive physiology in livestock
- Dairy cattle management
- Artificial insemination technologies
Background:
- Optimizing artificial insemination (AI) success is crucial for dairy herd efficiency.
- Presynchronization protocols aim to improve estrus detection and conception rates.
- Controlled internal drug release (CIDR) devices offer a method for hormonal manipulation in cattle.
Purpose of the Study:
- To evaluate the efficacy of presynchronization treatments on pregnancy per AI (P/AI).
- To compare days to first AI and the proportion of heifers pregnant within 7 days of AI eligibility.
- To assess the economic impact of different presynchronization strategies in Holstein heifers.
Main Methods:
- Holstein heifers were randomly assigned to three groups: 14-day CIDR presynchronization, PGF2α presynchronization, or no presynchronization (control).
- Hormonal treatments (CIDR, PGF2α) were administered prior to AI eligibility.
- Estrus was detected daily using tail paint, and AI was performed upon estrus detection.
Main Results:
- The 14-day CIDR group showed a significantly higher proportion of heifers detected in estrus within 7 days (95.8%) compared to PGF2α (74.6%) and control (66.9%) groups.
- Days to first AI were reduced in the 14-day CIDR group (3.6 days) compared to PGF2α (5.0 days) and control (6.8 days).
- Pregnancy per AI for the first AI within 7 days was highest in the 14-day CIDR group (71.9%), and the proportion pregnant within 7 days of eligibility was also significantly greater (68.9%) compared to other groups.
Conclusions:
- A 14-day CIDR presynchronization protocol effectively enhances estrus detection and increases the proportion of dairy heifers pregnant within the first week of breeding eligibility.
- This protocol leads to reduced days to first AI and a higher overall pregnancy rate compared to PGF2α presynchronization or no presynchronization.
- The 14-day CIDR protocol demonstrated a positive economic benefit, suggesting its value for dairy producers aiming to improve reproductive efficiency.
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