Synchronization Of Zeal In Dairy Females

Synchronization of zeal in dairy females

Introduction

The synchronization of the estrus in cattle allows the presentation of the zeal in a simultaneous form of the females in the same herd, this technique complements artificial insemination (AI) and allows to greatly improve reproductive parameters in dairy livestock, this technique is usedIn females that have reached adequate sexual maturity. The use of hormones such as progestogens that allows simulating a lute phase when blockIn bovine females, it should be noted that the influence of external factors such as the environment, food, among others, must be considered within the management of synchronization due to their effect on the presentation of the estrus (Bastidas Vallejo, 2017).

Estros synchronization methods

Synchronization with prostaglandins

The growth of the CL allows the secretion of progesterone (P4), this hormone reduces the concentrations of the luteinizing hormone (LH) that has a direct effect on ovulation, while the CL remains ovulation will not be carried out (lucio, seventh, &Bedolla, 2016).

One of the most used hormones in the synchronization of jealousy cows is the PGF2α, this hormone causes the lysis of the CL allowing ovulation, administering PGF2α in the last phase of growth or in the first static phase of the dominant follicle will produce the ovulation between3 to 4 days, while applying PGF2α in an average or late static phase of the dominant follicle, will induce ovulation in the next follicular wave between 5 to 7 days later, therefore detecting the heat effectively allows you to achieve a high rate inPregnancy (Sarmiento G, 2014).

The protocol to use with this method is as follows:

• Day 0: PGF2α is applied to the cows that have been detected the presence of CL.
• Day 2-5: The zeal is detected and the AI to the cows are carried out in stan.
• Day 14: PGF2α applies to cows that have not reached the estrus so they did not respond to the first dose.
• Day 16-19: zeal is detected in the cows and the AI is (Miró Arias, 2014).

Synchronization with intravaginal devices (P4)

Progesterone (P4) prevents the secretion of the follicle stimulating hormone (FSH) and LH respectively, both in charge of the maturation of the follicles and ovulation in the cow, this will allow the accumulation of both hormones that will be released subsequently abruptly when thedevice is retired (Miró Arias, 2014).

Also called intravaginal devices (DIB), they allow to have high circulating levels of P4 in the body while the device is in the cow vagina, allowing to control the presentation of the estrus and the ovulation (Yanzaguano Romero, 2013).

The protocol to be used is as follows:

• Day 0: The device with P4 will be implemented together with the administration of estradiol benzoate.
• Day 7-8: The P4 device is extracted and PGF2α is administered.
• Day 8-9: Estradiol benzoate is administered, artificial insemination is carried out on a fixed time (IATF) 52 to 56 hrs after removing the device with P4 (Marizancén Silva & Artunduaga Pimentel, 2017)

Synchronization with Ovsynch protocol (GPG)

It is a method in which GNRH and PGF2α hormones are administered, which allow the maturation of the dominant follicles causing ovulation, they begin a new follicular wave and produce the lysis of the CL CITATION GIR08 L 12298 (Giraldo Giraldo, 2008).

It is a widely used method in dairy livestock, synchronizes the cows that are cycling in order to cause ovulation without presentation of the heat, the GNRh causes the dominant folliculus to ovule or return to the end of starting a new follicular wave, at 7 later daysThe application of PGF2α causes the Lisis of the Luteo body that together with the application of GNRH for the second time will induce the ovulation of a new citation see19 l 12298 (Verástegui Díaz, 2019).

The protocol to be used is as follows:

• Day 0: Gnrh is administered
• Day 7: PGF2α application, in this way ovulation will be synchronized in a 90% of the treated cows.
• Day 9: GNRH is re -managed at 56hrs producing a default ovulation that occurs within 24 to 32hrs after this second application.
• Day 10: IATF is made to all cows from 8 to 18hrs after the second application of GNRH CITATION YAN13 L 12298 (Yanzaguano Romero, 2013).

Synchronization by G6G Ovsynch

This protocol has the advantage of improving 10 to 15% the fertility rate of the Ovsynch protocol. The first application of GNRH when using the Ovsynch protocol referring to the sixth day of the program, allows the approximate ovulation of 97% of the cows, subsequently the formation of a CL is induced in order to raise the concentrations of P4 which theProbabilities of gestation increase Citation MIR14 L 12298 (Miró Arias, 2014).

The protocol to be used is as follows:

• DAY 0: A PGF2α injection is administered
• DAY 2: GNRH is administered
• DAY 8: GNRH is administered
• Day 15: PGF2α is administered
• DAY 17: GNRH is administered in the afternoon
• DAY 18: At 16 hours later the Ia Citation Yan13 L 12298 (Yanzaguano Romero, 2013) is carried out.

Conclusions

Synchronization in milk females allows the presentation of ovulation in the estimated period of time, favors artificial insemination to later obtain synchronized births at the established time, this considerably increases the production of this type of farms since it would be considered to obtain a goodNumber of replacement females.

Bibliography

1. Bastidas Vallejo, and. AND. (2017). Synchronization Methods in Milk Bovines applicable for the Popayán Plateau. Popayán: Open National University ‘Unad’.
2. Giraldo Giraldo, J. J. (2008). Synchronization and resynchronization of jealousy and ovulations in milk and meat cattle. Lasallista de Investigo Magazine, 90-99.
3. Lucio, r., Sent, l., & Bedolla, J. L. (2016). Jealousy synchronization using GNRH and PGF2α for artificial insemination in fixed time in milk producing cattle. Experimental Systems Magazine, 3-7: 60-64.
4. Marizancén Silva, M. A., & Artunduaga Pimentel, L. (2017). Genetic improvement in cattle through artificial insemination and artificial insemination on a fixed time. Agricultural and Environmental Research Magazine, 247-259.
5. Miró Arias, M. (2014). Improvement of reproductive efficiency of dairy cattle through handling. Córdoba-Spain: University of Córdova.
6. Sarmiento G, M. A. (2014). Pregnancy rate evaluation with synchronization protocols E2P4PGF2A with three retirement times of the intravaginal device, in holstein cows. Cuenca: Salesian Politecnica University.
7. Verástegui Díaz, J. M. (2019). Ovulation synchronization programs in Holstein cows in a dairy stable of the Lima basin. Lima: La Molina Agrarian University.
8. YANZAGUANO ROMERO, C. A. (2013). Pregnancy rate evaluation using artificial insemination in fixed time (IATF) to 0-10-20 hours Post Apply the Ovsynch synchronization protocol. Cuenca: Salesian Politecnica University.