VET ENDO | Estrus Synchronization in Cattle | Student Output

#VetEndo #Endocrinology #EstrusSynchronization
In this clip, the group of Blessie del B. Purca (speaker), Jubilee Nile C. Namia, Windell Gaye C. Juntilla, and Ruzz S. Balasa talk about the concept and significance of estrus synchronization in cattle.
Synchronizing Estrus in Cattle
Estrus synchronization-which is a manipulation of the reproductive process-offers several benefits. It:
- Reduces and in some cases eliminates the need to detect estrus and allows the herd manager to schedule breeding activities in a predetermined period lasting from 1 to 12 days. Artificial insemination (AI) activities are confined to a few intensive days.
- Creates a more uniform calf crop.
- Enables more cows to be bred to a superior sire.
- Shortens the breeding and calving seasons.
Cows not conceiving will return to estrus again beginning about 18 to 25 days after the synchronization period. The females will still be synchronized to a slight degree, which gives a second chance to artificially inseminate each female in the early part of the breeding season. Without synchronization, the herd manager is faced with a 21-day period of continual estrus detection and only one opportunity for AI in most females. This is because only 5 to 7 percent of females will display estrus more than once during the first 21 days of breeding. For best results with an estrus synchronization program and to ensure optimum fertility, ranchers should:
- Practice high-quality herd management.
- Provide adequate nutrition, because undernourished cows may not respond to treatment, much less conceive.
- Vaccinate before the breeding season to prevent reproductive diseases.
- Arrange for the services of experienced AI technicians.
- Acquire high-quality semen.
Beef cows with calves less than 40 days old may be anestrous (not experiencing cycles) and respond less than cows that are cyclic. The response of replacement heifers depends on whether they have reached puberty. Fifteen-month-old heifers that have reached at least 65 percent of their expected mature weight respond better than younger heifers at a lighter weight.
Estrus Synchronization Products and How they Work
Estrus synchronization programs use one or a combination of three hormones: prostaglandins, progesterone, and GnRH.
Prostaglandins (PG) are produced naturally in the animal’s body and function, in part, to affect the estrous cycle. In cyclic females, estrus occurs within 2 to 6 days after they are given intramuscular injections of prostaglandin F2 alpha (Lutalyse®) or one of its analogues (ProstaMate®, Estrumate®, estroPLAN®, SYNCHSUREIn-Synch®).
Remember: Anestrous females do not respond to prostaglandin injections. Estrous-cyclic females can respond to injections between days 7 and 16 of their cycles if they have a functional corpus luteum (CL). The CL is a gland that develops in the ovary and secretes the hormone progesterone into the cow’s blood. Estrous-cyclic females at days 0 to 6 and 17 to 21 of their cycles are without functional CLs and do not respond to injections. However, an estrous-cyclic female without a functional CL will respond to injections if they are given in a specific sequence.
Progesterone is a naturally occurring hormone that functions to maintain pregnancy. This hormone also “blocks” estrus and ovulation during the diestrus phase of the estrous cycle.
Two kinds of progesterone products are used to synchronize estrus:
- A controlled intra-vaginal release device (CIDR®), which is an insert that contains progesterone. A special applicator tool is required to insert the device. A string is attached for removal at the end of the treatment.
- MGA® (melengestrol acetate), which is a progestin feed additive. It acts like progesterone in the body.
Because both CIDR® and MGA® products “hold” animals out of estrus, their timed removal will synchronize estrus in responding females. When CIDR®s are used in combination with GnRH or prostaglandin, 20 to 40 percent of anestrous females may be induced into estrus.
GnRH, or gonadotropin-releasing hormone (trade names Cystorelin®, Fertagyl®, Factrel®, and OvaCyst®), is a naturally occurring hormone that causes the release of other hormones. One of these hormones affects follicle development on the ovary; another causes ovulation. Research indicates that when GnRH is given with prostaglandin to estrous- cyclic and noncyclic females, the patterns of follicular development are altered, inducing ovulation. This treatment may induce estrus in 10 to 30 percent of anestrous females.
GnRH treatment is not recommended for prepubertal heifers because these young heifers have not yet established fertile estrous cycles and have no consistent response to this hormone injection.
Source: agrilifeextension.tamu.edu/li...

[@haroldtobias9088]

Where to buy those product like CIDR, AND hormones

[@pinoyvetacadz]

probably thru online purchase

[@ariesumali6910]

gud pm mam nakakabili po ba sa da ng mga product na yan

[@pinoyvetacadz]

agrivet po