Background introduction
The current dairy industry is in a sluggish market，Serious unbalanced supply and demand，Difficulty in survival on the ranch，How to improve quality and efficiency to become all-in-oneCattleProblems that people must face。Because of this，Make milkCattleBreeding work，Improve the first-particle pregnancy rate，Reduce the percentage of empty pockets，Shorten the calving interval，It is particularly important in the current difficult situation。MilkCattlesynchronizationDealing with breeding management in the pasture plays a very important role，Very widely used。The basis of various concurrent plans is to ovulate the same period(Ovsynch)program，Also known as“079”program，That is,0Day injectionGnRH，The7Day injectionPGF，The9Day injectionGnRH，16-18hAfter artificial sperm degeneration，See the diagram for the procedure flow1。
picture1 Ovsynch Program diagram
Progesterone concentrations at each node in the concurrent program are crucial to the effectiveness of the program，EspeciallyG2corpus luteal dissolution。Many studies have shown，G2Progesterone levels are high(≥0.4ng/ml)ofCattle，Its deficiency rate is significantly lower than that of progesterone concentrationCattle(See the picture2)。
picture2 Second needle Gonarelin（G2）Effect of progesterone concentration on the pregnancy rate during injection
（*Quote fromJ. O. Giordano , M. C. Wiltbank , J. N. Guenther et al.）
D-Sodium chlorprostol(D-cloprostenolsodium)Synthetic prostaglandins(PGF2α)Similarities of，Can effectively dissolve corpus luteum，The effect of enhancing the contraction of uterine smooth muscle，Can be used to treat lasting corpus luteum、Inemesis caused by luteal cyst、Prevention and treatment of endometriitis and promoting ovaries、Uterine repair and other diseases，Can also be used for female animalssynchronization。D-Sodium chlorprostoxide asPGF2αSimilarities of，It has bothPGF2αSimilar pharmacological effects and clinical uses，Overcome againPGF2αIt is easy to be metabolized in the body、Large usage、Disadvantages such as unstable properties。This testpasseduse“Placenta”(D-Sodium chlorprostoxide injection)with butyramine prostaglandinF2αcontrast，Comparison of the pregnancy rate after the same period of use，Clinical use for ranchprovideTest basis。
Trial grouping
1. Time and place
The start and end time of this test is2024Year4The moon is here5moon，In the northwestXXThe ranch is underway。
2. Test animals
For testingCattleThe group is the first1-3Pirth444headCattle，Put milkCattleRandomly divided into two groups，A group as a comparison（butyriamolF2αGroup），A group as a test（Placenta group）。For testingCattleGroups implement slaughter feeding，The feeding and management conditions are the same。
Test site
3. Test plan
After giving birth46Heaven to motherCattleuse“Double-simultaneous period”plan（See the picture3、4）conductsynchronizationdeal with，That is,46、56、63、72Tian Injection Gonarelin，The53、70、71Injection of terema aminotriolF2α（Control group）or“Placenta”（Test group）Perform processing。After processing is completed, the mother will beCattlePerform artificial sperm degeneration，After breeding32 dUse left and rightBExcessive pregnancy test。
picture3 Control group trial protocol
picture4 Test group test plan
Results and Analysis
Test group processing motherCattle161head，The pregnancy test is positive111head，Pregnancy rate is68.94%，Control group treatment motherCattle283head，The pregnancy test is positive163head，Pregnancy rate is57.6%，The pregnancy rate in the experimental group was significantly higher than that in the control group。ComparedifferentParity motherCattleDeath rate after treatment，The pregnancy rate in the experimental group was also higher than that in the control group，See the table for the test results1。
surface1 Test data statistics table
picture5 Comparison of the fetal rate results of control and experimental groups
picture6 Timed ejaculationDominant vesicles
picture7 Ovarian status in estrus
(Left side：Uterine status；Right side：Mature egg vesicles)
picture8 The pregnancy test result is positiveBSuper picture
The above test results show that，In adult motherCattlePostpartum use“Placenta”Implementing a dual-simultaneous plan can significantly improve the first-distance pregnancy rate，Compared with the control group，First-match pregnancy rateenhanceDe6%withsuperior。“Placenta”Application in ranch breeding，Can improve the breeding efficiency of the pasture，Shorten the calving interval，Improve quality and efficiency for the ranch，Optimize breeding managementprovideNew ways of thinking and path to achieve。
Personnel introduction
Luo Xing
Ningbo Second Hormone Factory
MilkCattletechnologyservicemanager
l Engaged in milkCattleBreeding and breeding work10Yu Nian，Have experience in working in the Thousand Heads Ranch，Has worked inintegratingTuanhua Ranch is engaged in breeding management。
l Good at：MilkCattleDesign of the process plan for regular esophage deduction during the same period、Difficulty in pregnancyCattleDiagnosis and treatment、BSuper application operation、Propagation data analysis and milkCattleReproduction issuessolutionswait。