Effects of Synchro-Mate B and prostaglandin F2α on estrus synchronization and fertility in beef cattle

Abstract

The efficiency and precision of estrus synchronization and fertility were evaluated after prostaglandin F2α (PGF) treatment with or without pretreatment with Synchro-Mate B (SMB) in beef cattle. In the treatment group (SMB-PGF, n = 109), postpartum suckled (n = 53), and nonsuckled (n = 32) cows and virgin heifers (n = 24) received SMB for 9 d and PGF 72 h before implant withdrawal. In the control group (Control, n = 111), postpartum suckled (n = 51), and nonsuckled (n = 36) cows and virgin heifers (n = 24) were observed for estrus and bred at spontaneous estrus over a 6-d period. Those not detected in estrus were then injected with PGF and bred at induced estrus over an additional 6-d period. Synchronization rate at induced estrus was higher (95.4 vs. 84.2%, P < 0.01) and time interval from induction to onset of estrus was shorter (37.0 ± 2.1 h vs. 56.7 ± 2.8 h, P < 0.01) in the SMB-PGF group than after PGF in the Control group. Whether the time around the mean interval to estrus (precision) was ± 6, ± 12, ± 18 or ± 24 h, the synchronization rate was always higher (P < 0.01) in the SMB-PGF than in the Control group. Heifers and cows in both groups had similar estrus synchronization rates and mean intervals to estrus. Suckled and nonsuckled cows behaved similarly in their estrus response within the SMB-PGF group but not in the Control group. Our results indicate that administration of PGF 72 h before SMB implant withdrawal could be a very efficient and precise synchronization method without a negative effect on fertility in beef cattle. Key words: Estrus synchronization, beef cattle, Synchro-Mate B, prostaglandin F2α

Synchronization of ovarian follicular waves with a gonadotropin-releasing hormone agonist to increase the precision of estrus in cattle: a review.

“…Several methods of estrus synchronization using progestogens, PGF 2a , and the combination of progestogens and PGF 2a have been investigated (Patterson et al, 1989;Odde, 1990;Twagiramungu et al, 1992a). Although estrus is synchronized, application of these methods is often compromised because they are too time-consuming and the precision of estrus and(or) fertility rate do not meet producers' expectations.…”

Biotecnologías reproductivas en el ganado bovino: cinco décadas de investigación en México

“…El norgestomet (CRESTAR®), (progestágeno más potente que la progesterona natural), aplicado subcutáneamente en el dorso de la oreja y retirado 9 días después de su implantación, asociado con VE y PGF2α (sólo en vacas ciclando), también demostró ser útil en la sincronización estral y la ovulación (31)(32)(33)(34) . De tal manera que en un estudio (35) con vacas cebú y sus cruzas con europeo, sin cría, en empadre de 63 días (42 días de IA y 21 de monta natural), se lograron, a los 5 días del retiro del implante, TES de 86.1 y 95.0 % en vacas anéstricas y ciclando, respectivamente.…”

Use of Technology in Controlling Estrus in Cattle

“…[58][59][60][61][62] When GnRH is a component of estrous synchronization and breeding management protocols, timing (day of the estrous cycle relative to stage of follicle dominance) of GnRH injection is important for follicle turnover and ovulation management to be successful as measured by acceptable pregnancy rates, especially when TAI is the method of breeding. [58][59][60][61][62] When GnRH is a component of estrous synchronization and breeding management protocols, timing (day of the estrous cycle relative to stage of follicle dominance) of GnRH injection is important for follicle turnover and ovulation management to be successful as measured by acceptable pregnancy rates, especially when TAI is the method of breeding.…”