Twin Calving Induction via Segmented Hormone Control
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Solution Overview
Problem
Current methods for inducing twin calving in cattle are either unstable, require high technical skill, or involve costly and complex equipment, making them impractical for large-scale application.
Innovation Solution
A method involving an intravaginal progesterone releasing device, sequential hormone injections of progestin, estrogen, and FSH, followed by artificial insemination, to control follicular development and induce ovulation of multiple follicles, thereby achieving twin calving without relying on specialized equipment or technical expertise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hormone induction method using PMSG or FSH is used, then twin calving can be induced, but the method has poor stability and feasibility due to long half-life of PMSG disturbing follicle development or inability to control codominant follicle number with FSH alone
Solution Approach 1:
The treatment is divided into distinct phases: initial FSH administration to stimulate follicle recruitment, followed by estradiol benzoate injection to select and maintain codominant follicles, and finally hCG injection to induce ovulation. This segmented approach allows precise control over follicle development at each stage, resolving the instability issue of previous single-hormone methods.
Solution Approach 2:
The method employs preliminary FSH treatment (5-10 IU/day for 7-14 days) before the critical selection phase to recruit multiple follicles to the antral stage. This preliminary action ensures that sufficient follicles are available for selection by subsequent estradiol benzoate treatment, improving the reliability of achieving codominant follicles.
2Reliability
If mechanical aspiration method is used, then probability of producing codominant follicles increases, but the method requires high technical skill and expensive B ultrasound equipment
Solution Approach 1:
The mechanical aspiration method using B ultrasound guidance is replaced with a hormonal regulation system. Instead of mechanically removing follicles to manipulate FSH levels, the invention uses FSH injection followed by estradiol benzoate to naturally select and maintain codominant follicles through endocrine control, eliminating the need for expensive ultrasound equipment and technical aspiration skills.
Solution Approach 2:
The method changes the control parameter from mechanical follicle removal to hormonal concentration management. By precisely controlling FSH dosage (5-10 IU/day) and timing, followed by estradiol benzoate injection (0.5-2.0 mg/cow), the system achieves codominant follicle selection through biochemical parameter adjustment rather than mechanical intervention.
3Productivity
If hormone plus mechanical aspiration method is used, then 2-3 ovulations can be achieved at 90% rate, but the procedure requires special estrus synchronization treatment and aspirating more than 3 large follicles, making it difficult to popularize
Solution Approach 1:
The complex mechanical aspiration step requiring skillful removal of more than 3 large follicles is extracted and replaced with hormonal treatment. The invention uses estradiol benzoate injection to naturally cause atresia of non-dominant follicles while maintaining codominant ones, eliminating the need for technical aspiration procedures and special estrus synchronization protocols.
Solution Approach 2:
The system allows the cow's own endocrine system to perform the selection function. Instead of requiring external mechanical intervention to remove follicles, the estradiol benzoate treatment enables the cow's body to self-regulate follicle development, causing non-selected follicles to undergo atresia naturally while preserving the codominant follicles for ovulation.
4Reliability
If inhibitor immunization using inhibin is used, then endogenous FSH secretion can be adjusted, but the extraction and purification of inhibin and preparation of gene vaccine are complex
Solution Approach 1:
Instead of using complex inhibin extraction and gene vaccine preparation, the invention employs commercially available, inexpensive FSH and estradiol benzoate hormones. These disposable hormonal treatments can be administered directly without requiring complex purification or vaccine preparation processes, making the method economically viable and easy to implement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively induces twin calving with a high success rate, improving reproductive efficiency and reducing feeding costs by allowing for controlled follicular development and ovulation, thus enhancing breeding benefits and feed utilization.
Implementation Method 1
inserting an intravaginal progesterone releasing device in a cow
Implementation Method 2
injecting progestin and estrogen to cause atresia of antral follicles and initiate a new follicular wave
Implementation Method 3
injecting estrogen to inhibit the secretion of FSH through negative feedback
Implementation Method 4
injecting follicle-stimulating hormone (FSH) for 4 times at 10-14 h intervals with sequential dosages, leading to the development of codominant follicles
Implementation Method 5
injecting estrogen to induce the large follicles to ovulate
Data Source
AI summary
The present invention provides a method for inducing twin calving. The method according to the present invention comprises firstly treatment to inducing atresia of the antral follicles on ovary so as to initiate the development of new follicular wave, inducing the development of codominant follicles and further achieving double ovulations by exactly controlling the dosage and time points of hormone injections, and performing artificial insemination to induce the cow to deliver twin calves. The method according to the present invention has relative independent on the technical skills, and a person skilled in the art or a common worker can practice it according to specified operation methods; and during practical application, it does not require special equipment, thus saving cost, as well as improving the social benefit and economic benefit of cow breeding.