dc.contributor.author |
López-Helguera, Irene |
dc.contributor.author |
López Gatius, Fernando |
dc.contributor.author |
García Ispierto, Irina |
dc.contributor.author |
Serrano, Beatriz |
dc.contributor.author |
Colazo, Marcos G. |
dc.date |
2017-10-24T08:20:29Z |
dc.date |
2017 |
dc.identifier |
2300-8733 |
dc.identifier |
http://hdl.handle.net/10459.1/60348 |
dc.identifier |
https://doi.org/10.1515/aoas-2016-0083 |
dc.identifier.uri |
http://hdl.handle.net/10459.1/60348 |
dc.description |
This study evaluated the effect of a once-used progesterone (P4) intravaginal device (PRID) associated with four different shortened P4-based estrus synchronization (ES) protocols on estrous response (ER) and pregnancy per AI (P/AI) in cyclic and acyclic lactating dairy cows. Cows (n=465) were randomly assigned to one of the following protocols: 1) 2PGG, cows were given a PRID-Delta and 100 μg GnRH i.m. at PRID insertion (day 0). The PRID was left for 5 d, and 25 mg of dinoprost (PGF2α) i.m. given twice at PRID removal and 24 h later; 2) 2PGGe, same treatments as 2PGG plus 500 IU of eCG i.m. at PRID removal; 3) 2PGe, same treatments as 2PGGe, except GnRH was not given at PRID insertion; 4) PGe, same treatments as 2PGe, except PGF was only given at PRID removal. A total of 258 cows received a new PRID-Delta containing 1.55 g of P4, whereas 207 cows received a once-used PRID. Estrus was determined from P4 device removal until 96 h after using an automated heat detection system. Cows in estrus were given a second GnRH at AI and those without signs of estrus by 96 h after PRID removal were given GnRH and timed-AI (TA I). All inseminations were performed by one technician with commercially available frozen-thawed semen. Ultrasonography was performed at initiation of protocol and 28-34 days post AI to determine cyclicity and pregnancy status, respectively. Cows receiving once-used P4 devices had greater ER than cows receiving a new device (59.9 vs. 50.0; P=0.029), but P/AI did not differ between P4 devices, respectively (P>0.1; 40.6 vs 40.7%). Cyclic cows were less likely to display estrus than acyclic cows by a factor of 0.66 (P=0.036). Cows subjected to the 2PGe (2.41; P<0.01) protocol were more likely to display estrus than cows subjected to the 2PGG, whereas cows subjected to the PGe protocol did not differ (0.94; P=0.8) from those in the 2PGG group. Despite differences in ER, neither cyclicity nor estrus synchronization protocol affected P/AI (overall 40.6%). In summary, cyclic cows, those given a new P4 device and those subjected to either 2PGG or PGe protocol had reduced ER. However, all the factors examined had no significant effect on P/AI. All the estrus synchronization protocols resulted in acceptable fertility. |
dc.language |
eng |
dc.publisher |
De Gruyter Open |
dc.relation |
Reproducció del document publicat a https://doi.org/10.1515/aoas-2016-0083 |
dc.relation |
Annals of Animal Science, 2017, vol. 17, núm. 3, p.757-770 |
dc.rights |
cc-by-nc-nd (c) López-Helguera et al., 2017 |
dc.rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Re-used PRID |
dc.subject |
Acyclic dairy cows |
dc.subject |
Estrus detection |
dc.subject |
Pregnancy per AI |
dc.title |
Effect of PRID-Delta devices associated with shortened estrus synchronization protocols on estrous response and fertility in dairy cows |
dc.type |
article |
dc.type |
publishedVersion |