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CIDRs are approved for use in both beef cattle and dairy heifers in Canada and the United States. [2] CIDRs contain 1.9g of progesterone in Canada and 1.38g in the United States. [2] The CIDR-S is licensed for use in sheep and goats in New Zealand and Australia. [1] The CIDR-G is also suitable for use in ewes, lambs and goats. [4]
Progesterone devices are broadly used in the control of reproductive management in livestock. They work by increasing circulating plasma progesterone levels with the following consequences: Progesterone suppresses the secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus.
There is a great demand for ovulation to be induced in cattle, as it allows farmers to synchronize their cattle to ovulate at the same time, helping improve the efficiency of dairy farming. [22] Induced ovulation can be utilized during the warmer seasons to increase plasma progesterone and improve the fertility of the cattle. [ 23 ]
The etymology of the term "freemartin" is uncertain: speculations include that "free" may indicate "willing" (referring to the freemartin's willingness to work) or "exempt from reproduction" (referring to its sterility, or to a farmer's decision to not bother trying to breed a freemartin, or both), or that it may be derived from a Flemish word for a cow which gives no milk and/or has ceased to ...
The ability to control the estrus cycle is much easier today because of products that safely assist in aligning heat cycles. Some examples of products are PG600, CIDRs, Estrumate and Folltropin V. These products contain progesterone which will bring on the induction of estrus in ewes (sheep) during seasonal anestrus.
Estrous synchronisation is the process of targeting female mammals to come to heat within a short time frame (36 to 96 hours). This is achieved through the use of one or more hormones. Methods to improve our ability to synchronize the reproductive process and result in the ‘timed insemination’ without the detection of heat have been developed.