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Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows
SIMPLE SUMMARY: The efficacy of two timed-AI protocols (5- and 7- Ovsynch + PRID) and a modified G7G protocol, that included intermediate heat detection, was evaluated. There was no difference in Pregnancy per AI between the two timed-AI protocols. The modified G7G protocol resulted in higher P/AI c...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8532827/ https://www.ncbi.nlm.nih.gov/pubmed/34679976 http://dx.doi.org/10.3390/ani11102955 |
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author | Brozos, Christos Kiossis, Evangelos Hatzieffraimidis, Savvas Praxitelous, Anastasia Gouvias, Ioannis Kanoulas, Vasileios Tsousis, Georgios |
author_facet | Brozos, Christos Kiossis, Evangelos Hatzieffraimidis, Savvas Praxitelous, Anastasia Gouvias, Ioannis Kanoulas, Vasileios Tsousis, Georgios |
author_sort | Brozos, Christos |
collection | PubMed |
description | SIMPLE SUMMARY: The efficacy of two timed-AI protocols (5- and 7- Ovsynch + PRID) and a modified G7G protocol, that included intermediate heat detection, was evaluated. There was no difference in Pregnancy per AI between the two timed-AI protocols. The modified G7G protocol resulted in higher P/AI compared to the pooled data from the two TAI protocols. As a conclusion, enhancing detection of estrus within a synchronization protocol, by increasing the proportion of cows eligible to show estrus (e.g., by pre-synchronization) or by using activity-monitoring systems, could improve the reproduction indices of dairy cows. ABSTRACT: The aim of this study was to evaluate the efficacy of two timed-AI (TAI) protocols (Group G5D, GnRH and PRID -5d- PGF2a -1d- PGF2a -1d- GnRH, n = 105 and Group G7D, GnRH and PRID-7d- PGF2a -1d- PGF2a -1d- GnRH, n = 98) and a modified G7G protocol combining heat detection (HD) and AI or TAI if HD failed (Group HD, GnRH and PRID -7d- PGF2a -1d- PGF2a -5d- HD or 5d TAI if no HD, n = 92). Pregnancy per AI (P/AI) did not differ between G5D and G7D protocol (G5D: 33.8% vs. G7D: 35.2%, P = 0.85). Cows assigned to G5D and G7D group were pooled as TAI group (GTAI) and further compared to GHD. Within the GHD, more primiparous cows exhibited estrous signs compared to multiparous cows (70.4% vs. 46.2%, P = 0.03). Furthermore, 49 cows (53.3%) were served after HD, whereas 43 cows (46.7%) were served after TAI. There was no difference in P/AI between cows served after HD (51.6%) or after TAI (43.0%, P = 0.49). GHD showed higher P/AI at 1st service compared to GTAI (49.1% vs. 36.4%, P = 0.04), whilst, median days to pregnancy did not differ between the two groups. Overall, P/AI of primiparous cows tended to be better in comparison with multiparous cows (48.3% vs. 37.2%, P = 0.06). In conclusion, there was no significant difference regarding the efficacy of 5- and 7-day Ovsynch + PRID protocols. Moreover, a modified G7G protocol, with intermediate heat detection, resulted in overall better P/AI compared to TAI protocols and appears as a promising strategy to optimize estrus detection for 1st AI. |
format | Online Article Text |
id | pubmed-8532827 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-85328272021-10-23 Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows Brozos, Christos Kiossis, Evangelos Hatzieffraimidis, Savvas Praxitelous, Anastasia Gouvias, Ioannis Kanoulas, Vasileios Tsousis, Georgios Animals (Basel) Article SIMPLE SUMMARY: The efficacy of two timed-AI protocols (5- and 7- Ovsynch + PRID) and a modified G7G protocol, that included intermediate heat detection, was evaluated. There was no difference in Pregnancy per AI between the two timed-AI protocols. The modified G7G protocol resulted in higher P/AI compared to the pooled data from the two TAI protocols. As a conclusion, enhancing detection of estrus within a synchronization protocol, by increasing the proportion of cows eligible to show estrus (e.g., by pre-synchronization) or by using activity-monitoring systems, could improve the reproduction indices of dairy cows. ABSTRACT: The aim of this study was to evaluate the efficacy of two timed-AI (TAI) protocols (Group G5D, GnRH and PRID -5d- PGF2a -1d- PGF2a -1d- GnRH, n = 105 and Group G7D, GnRH and PRID-7d- PGF2a -1d- PGF2a -1d- GnRH, n = 98) and a modified G7G protocol combining heat detection (HD) and AI or TAI if HD failed (Group HD, GnRH and PRID -7d- PGF2a -1d- PGF2a -5d- HD or 5d TAI if no HD, n = 92). Pregnancy per AI (P/AI) did not differ between G5D and G7D protocol (G5D: 33.8% vs. G7D: 35.2%, P = 0.85). Cows assigned to G5D and G7D group were pooled as TAI group (GTAI) and further compared to GHD. Within the GHD, more primiparous cows exhibited estrous signs compared to multiparous cows (70.4% vs. 46.2%, P = 0.03). Furthermore, 49 cows (53.3%) were served after HD, whereas 43 cows (46.7%) were served after TAI. There was no difference in P/AI between cows served after HD (51.6%) or after TAI (43.0%, P = 0.49). GHD showed higher P/AI at 1st service compared to GTAI (49.1% vs. 36.4%, P = 0.04), whilst, median days to pregnancy did not differ between the two groups. Overall, P/AI of primiparous cows tended to be better in comparison with multiparous cows (48.3% vs. 37.2%, P = 0.06). In conclusion, there was no significant difference regarding the efficacy of 5- and 7-day Ovsynch + PRID protocols. Moreover, a modified G7G protocol, with intermediate heat detection, resulted in overall better P/AI compared to TAI protocols and appears as a promising strategy to optimize estrus detection for 1st AI. MDPI 2021-10-13 /pmc/articles/PMC8532827/ /pubmed/34679976 http://dx.doi.org/10.3390/ani11102955 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Brozos, Christos Kiossis, Evangelos Hatzieffraimidis, Savvas Praxitelous, Anastasia Gouvias, Ioannis Kanoulas, Vasileios Tsousis, Georgios Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows |
title | Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows |
title_full | Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows |
title_fullStr | Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows |
title_full_unstemmed | Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows |
title_short | Comparison of 5 Versus 7-Day Ovsynch + Progesterone Releasing Intravaginal Device Protocols (PRID) and a Modified G7G with an Option of Heat Detection Protocol for 1st Service in Lactating Dairy Cows |
title_sort | comparison of 5 versus 7-day ovsynch + progesterone releasing intravaginal device protocols (prid) and a modified g7g with an option of heat detection protocol for 1st service in lactating dairy cows |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8532827/ https://www.ncbi.nlm.nih.gov/pubmed/34679976 http://dx.doi.org/10.3390/ani11102955 |
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