Results 51 to 60 of about 105 (71)
Some of the next articles are maybe not open access.
Theriogenology, 2015
The objective was to compare 3 timed artificial insemination (TAI) protocols in lactating dairy cows during heat stress. Multiparous Holstein cows yielding (mean ± SEM) 29.4 ± 0.3 kg of milk/d randomly were assigned to 1 of 3 TAI protocols at 34 ± 5.1 days in milk: 1) double-Ovsynch (DO; n = 486): the cows received GnRH-7d-2α-3d-GnRH and Ovsynch56 ...
Essa Dirandeh, M G Colazo, M G Colazo
exaly +3 more sources
The objective was to compare 3 timed artificial insemination (TAI) protocols in lactating dairy cows during heat stress. Multiparous Holstein cows yielding (mean ± SEM) 29.4 ± 0.3 kg of milk/d randomly were assigned to 1 of 3 TAI protocols at 34 ± 5.1 days in milk: 1) double-Ovsynch (DO; n = 486): the cows received GnRH-7d-2α-3d-GnRH and Ovsynch56 ...
Essa Dirandeh, M G Colazo, M G Colazo
exaly +3 more sources
Theriogenology, 2020
We aimed to compare the reproductive performance of dairy cattle following a modified Presynch-Ovsynch, Double-Ovsynch, or conventional reproductive management program (CRMP). On Day 30 (±5) after calving (calving = Day 0), 960 lactating cows were assigned randomly to one of two presynchronization treatments, before the synchronization of ovulation ...
Ill Hwa Kim, Hyun-Gu Kang
exaly +3 more sources
We aimed to compare the reproductive performance of dairy cattle following a modified Presynch-Ovsynch, Double-Ovsynch, or conventional reproductive management program (CRMP). On Day 30 (±5) after calving (calving = Day 0), 960 lactating cows were assigned randomly to one of two presynchronization treatments, before the synchronization of ovulation ...
Ill Hwa Kim, Hyun-Gu Kang
exaly +3 more sources
More male calves born after Presynch-Ovsynch protocol with 24-hour timed AI in dairy cows
Theriogenology, 2013Various factors including synchronization treatments have been reported to influence sex ratio of offspring in cattle. The present study was conducted to investigate the effect of treatment with Presynch-Ovsynch protocol on sex ratio of offspring in Holstein dairy cows.
Vahid Akbarinejad
exaly +3 more sources
Animal Reproduction Science, 2006
The present study examined the effect of presence of clinical or subclinical endometritis at the initiation of Presynch-Ovsynch estrous synchronization program on the first service pregnancy rate in dairy cows. Lactating Holstein cows (N=275) were given a thorough reproductive examination at 32-38 days in milk, 3 days prior to the scheduled start of ...
R L Nebel, R L Nebel, R Kasimanickam
exaly +3 more sources
The present study examined the effect of presence of clinical or subclinical endometritis at the initiation of Presynch-Ovsynch estrous synchronization program on the first service pregnancy rate in dairy cows. Lactating Holstein cows (N=275) were given a thorough reproductive examination at 32-38 days in milk, 3 days prior to the scheduled start of ...
R L Nebel, R L Nebel, R Kasimanickam
exaly +3 more sources
Theriogenology, 2017
During the Presynch-Ovsynch protocol, at least half of the cows enrolled display signs of estrus, which can present as an opportunity for cows to be inseminated before the completion of the protocol. The primary objective of this study is to compare two management strategies for first service using the Presynch-Ovsynch protocol: insemination at ...
Fabio S Lima +2 more
exaly +3 more sources
During the Presynch-Ovsynch protocol, at least half of the cows enrolled display signs of estrus, which can present as an opportunity for cows to be inseminated before the completion of the protocol. The primary objective of this study is to compare two management strategies for first service using the Presynch-Ovsynch protocol: insemination at ...
Fabio S Lima +2 more
exaly +3 more sources
Indian Journal of Animal Research, 2021
Background: Standard estrus synchronization regimens resulted in variable outcomes in buffaloes. The present study evaluated ovarian and fertility responses following presynchronization in Heatsynch protocol administered in postpartum buffaloes. Methods: In group-I (Presynch-Heatsynch group, n=30), PGF2α was administered on days -14 and -2.
Harmeet Singh Sandhu +4 more
openaire +1 more source
Background: Standard estrus synchronization regimens resulted in variable outcomes in buffaloes. The present study evaluated ovarian and fertility responses following presynchronization in Heatsynch protocol administered in postpartum buffaloes. Methods: In group-I (Presynch-Heatsynch group, n=30), PGF2α was administered on days -14 and -2.
Harmeet Singh Sandhu +4 more
openaire +1 more source
Animal Science Journal, 2023
AbstractThe purpose of this study was to examine the effects of rumen‐protected methionine (RPM) supplementation on the reproductive and productive performance of primiparous dairy cows fed two levels of protein. The Presynch‐Ovsynch protocol was used to synchronize 36 lactating Holstein cows that were assigned randomly to one of six dietary treatments:
Mohamed Ayoub Abedal‐Majed +4 more
openaire +2 more sources
AbstractThe purpose of this study was to examine the effects of rumen‐protected methionine (RPM) supplementation on the reproductive and productive performance of primiparous dairy cows fed two levels of protein. The Presynch‐Ovsynch protocol was used to synchronize 36 lactating Holstein cows that were assigned randomly to one of six dietary treatments:
Mohamed Ayoub Abedal‐Majed +4 more
openaire +2 more sources
American Association of Bovine Practitioners Conference Proceedings, 2015
Remarkably, no large scale field study has been conducted to evaluate the reproductive performance of cows synchronized with Presynch-Ovsynch with a 12 versus a 14 d interval from Presynch to the beginning of Ovsynch when cows are inseminated in estrus after Presynch.
Thomas, M. J. +4 more
openaire +1 more source
Remarkably, no large scale field study has been conducted to evaluate the reproductive performance of cows synchronized with Presynch-Ovsynch with a 12 versus a 14 d interval from Presynch to the beginning of Ovsynch when cows are inseminated in estrus after Presynch.
Thomas, M. J. +4 more
openaire +1 more source
2022
In dairy farming reproductive performance and milk yield of cows have a major impact on the operation’s economic success. As the negative correlation between milk yield and reproductive performance is widely known, the dairy industry has a strong interest in finding ways to improve the entire reproductive management in high performing dairy herds. This
Marthold, Daniela +4 more
openaire +2 more sources
In dairy farming reproductive performance and milk yield of cows have a major impact on the operation’s economic success. As the negative correlation between milk yield and reproductive performance is widely known, the dairy industry has a strong interest in finding ways to improve the entire reproductive management in high performing dairy herds. This
Marthold, Daniela +4 more
openaire +2 more sources
Reproduction in Domestic Animals, 2018
ContentsThe objective was to compare pregnancy per artificial insemination (P/AI) with conventional (CS) or sex‐sorted semen (SS) in dairy cows subjected to one of the three timed AI protocols. Cows (n = 356) were randomly assigned to synchronization with Ovsynch (OVS), Presynch–Ovsynch (PO) or Double‐Ovsynch (DO) and inseminated on Day 77 ± 3 ...
Ebru Karakaya‐Bilen +6 more
openaire +4 more sources
ContentsThe objective was to compare pregnancy per artificial insemination (P/AI) with conventional (CS) or sex‐sorted semen (SS) in dairy cows subjected to one of the three timed AI protocols. Cows (n = 356) were randomly assigned to synchronization with Ovsynch (OVS), Presynch–Ovsynch (PO) or Double‐Ovsynch (DO) and inseminated on Day 77 ± 3 ...
Ebru Karakaya‐Bilen +6 more
openaire +4 more sources