PSIII-33 A new approach to resynchronize beef cows and perform two Timed Artificial Inseminations 24 days apart. (5th December 2019)
- Record Type:
- Journal Article
- Title:
- PSIII-33 A new approach to resynchronize beef cows and perform two Timed Artificial Inseminations 24 days apart. (5th December 2019)
- Main Title:
- PSIII-33 A new approach to resynchronize beef cows and perform two Timed Artificial Inseminations 24 days apart
- Authors:
- Colli, Marcos A
Cline, Garrett
Walker, Josh
Forrest, David
Baruselli, Pietro S
Looney, Charles - Abstract:
- Abstract: We aimed to compare the pregnancy rate from 1 st TAI and 2 nd TAI performed 24 days apart and pregnancy between cows that showed or not estrous on the end of 2 nd TAI protocol. Were used 190 lactating cows (Angus: 114; Brangus: 53 and Santa Gertrudis: 23). On the first day of synchronization (D0), insertion of a new CIDR® (Zoetis) plus the 100µg of Cystorrelin®(Merial) treatment, on D7 25mg of Lutalyse® (Zoetis) and CIDR withdrawal. 72 hours after CIDR removal 1 st TAI was performed plus GnRH treatment. After 14 days from 1 st TAI, all the cows received an one time used CIDR. The pregnancy diagnosis was performed 22 days after 1 st TAI, using a subjective visual evaluation of CL blood flow (BF). Pregnancy diagnosis was performed by ultrasonography Color Doppler (MicroMaxx®). Cows with an area of CL≥3cm² and/or ≥25% CL BF were diagnosed as pregnant and underwent CIDR removal without further treatment. Those diagnosed as non-pregnant underwent CIDR removal and received one Estrotect™ (Rockway-Inc.), 25mg of Lutalyse treatment and submitted to 2 nd TAI 48h after CIDR removal (D24) plus the 100µg of Cystorrelin. On D31 considered pregnant cows on D22 were examined by US B-mode D31 to verify false positive and effective pregnancies. On D55, cows were submitted to US B-mode to verify the 2 nd TAI pregnancy rate. Statistical analysis were performed using GLIMMIX procedure from SAS. The pregnancy on D22 was 48.5% (87/190) and the false positives were 14.9% (13/87). ThereAbstract: We aimed to compare the pregnancy rate from 1 st TAI and 2 nd TAI performed 24 days apart and pregnancy between cows that showed or not estrous on the end of 2 nd TAI protocol. Were used 190 lactating cows (Angus: 114; Brangus: 53 and Santa Gertrudis: 23). On the first day of synchronization (D0), insertion of a new CIDR® (Zoetis) plus the 100µg of Cystorrelin®(Merial) treatment, on D7 25mg of Lutalyse® (Zoetis) and CIDR withdrawal. 72 hours after CIDR removal 1 st TAI was performed plus GnRH treatment. After 14 days from 1 st TAI, all the cows received an one time used CIDR. The pregnancy diagnosis was performed 22 days after 1 st TAI, using a subjective visual evaluation of CL blood flow (BF). Pregnancy diagnosis was performed by ultrasonography Color Doppler (MicroMaxx®). Cows with an area of CL≥3cm² and/or ≥25% CL BF were diagnosed as pregnant and underwent CIDR removal without further treatment. Those diagnosed as non-pregnant underwent CIDR removal and received one Estrotect™ (Rockway-Inc.), 25mg of Lutalyse treatment and submitted to 2 nd TAI 48h after CIDR removal (D24) plus the 100µg of Cystorrelin. On D31 considered pregnant cows on D22 were examined by US B-mode D31 to verify false positive and effective pregnancies. On D55, cows were submitted to US B-mode to verify the 2 nd TAI pregnancy rate. Statistical analysis were performed using GLIMMIX procedure from SAS. The pregnancy on D22 was 48.5% (87/190) and the false positives were 14.9% (13/87). There was no difference on pregnancy 31 days after 1 st TAI (38.9%; 74/190) vs. 2 nd TAI (32.0%; 33/103; P = 0.24). Cows were more likely to be pregnant on D55 compared to cows that: showed Estrous: 42.9% (21/49) vs. No Estrous: 22.2% (12/54; P = 0.03). In conclusion, the pregnancy rates were the same at 1 st to 2 nd TAI. And cows that showed estrous had more pregnancy at 2 nd TAI. … (more)
- Is Part Of:
- Journal of animal science. Volume 97(2019)Supplement 3
- Journal:
- Journal of animal science
- Issue:
- Volume 97(2019)Supplement 3
- Issue Display:
- Volume 97, Issue 3 (2019)
- Year:
- 2019
- Volume:
- 97
- Issue:
- 3
- Issue Sort Value:
- 2019-0097-0003-0000
- Page Start:
- 257
- Page End:
- 258
- Publication Date:
- 2019-12-05
- Subjects:
- reproductive programs -- efficiency -- synchronization
Livestock -- Periodicals
Livestock
Electronic journals
Periodicals
636.005 - Journal URLs:
- https://dl.sciencesocieties.org/publications/jas/index ↗
http://www.asas.org/jas/ ↗
https://academic.oup.com/jas ↗
http://www.oxfordjournals.org/ ↗ - DOI:
- 10.1093/jas/skz258.524 ↗
- Languages:
- English
- ISSNs:
- 0021-8812
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - BLDSS-3PM
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- 15124.xml