![]() If she is not pregnant within 15 to 18 days of a normal cycle, prostaglandin is synthesized and released to regress the CL. As the CL matures, progesterone concentrations increase and remain elevated throughout pregnancy or the estrous cycle (see Figure 1) until the female either calves or is not pregnant. The CL is the primary progesterone source in the bloodstream. When the female ovulates, the site of ovulation develops a structure known as a corpus hemorrhagicum, which quickly (within four to seven days) develops into a corpus luteum (CL). Both can be used to synchronize estrous in cattle. Progesterone can be given in the natural (progesterone) or synthetic (progestin) form. Progesterone is a hormone used to maintain pregnancy. Depending on the protocol, these hormones can be used independently or in combination with one another. Progesterone, prostaglandin, gonadotropin releasing hormone (GnRH), follicle stimulating hormone (FSH) and luteinizing hormone (LH) are a few of the hormones involved in the estrous cycle (see Figure 1). ![]() Since different reproductive hormones are used in estrous synchronization, developing a basic understanding of several reproductive hormones is helpful for determining which protocol will work best for your herd. Numerous estrous synchronization protocols have been developed that use a combination of different drugs and products to alter hormonal changes in the female's estrous cycle. There are several advantages to consider when following an estrous synchronization protocol, including: 1) shortening the calving interval, which allows females (especially heifers) to conceive earlier in the breeding season 2) more effectively using AI and embryo transfer to reduce time and labor in detecting estrus (heat) and 3) producing a more uniform calf crop with similar ages.Įstrous synchronization will not substitute for lack of nutrition, herd health or poor herd management therefore, it is not effective in non-cycling females. The normal 21-day estrous cycle in beef cattle can be altered by following an effective estrous synchronization protocol. The trial version doesn't allow you to use the integrated player.Estrous (heat) synchronization in beef cattle involves manipulating the females' estrous cycle so they can be bred at about the same time.The trial version only allows you to synchronize 25 files each time it is launched.Synchronizing your iTunes libraries on different platforms is now possible if you download SuperSync for free, a perfect tool for the users of this application. This is compatible with the iPad, iPhone and iPod touch Apple devices.Ĭheck possible changes in your file's metadata, for duplicated files between libraries, corrupt or lost files or songs that you still haven't added to your library. You will be able to keep control of your file registry and move contents from one place to another with great ease. SuperSync can also make backups of your file collection and export part of them or playlists. Therefore you will be able to synchronize your libraries and make them available from anywhere with any browser. ITunes users now have SuperSync available, a tool capable of synchronizing your content between computers using Windows and Mac operating systems.
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