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Reproductive performance and herd exit dynamics of lactating dairy cows managed for first service with the Presynch-Ovsynch or Double-Ovsynch protocol and different duration of the voluntary waiting period [PDF]
Journal of Dairy Science, 2018 The objective of this experiment was to evaluate the reproductive performance and herd exit dynamics of dairy cows managed for first service with programs varying in method of submission for insemination and voluntary waiting period (VWP) duration. Holstein cows from a commercial farm in New York were randomly allocated to receive timed artificial ...
R Wijma, M Masello, J O Giordano
exaly +3 more sources
The effect of presynchronization with prostaglandin F2α and gonadotropin-releasing hormone simultaneously, 7 d before Ovsynch, compared with Presynch-10/Ovsynch on luteal function and first-service pregnancies per artificial insemination [PDF]
Journal of Dairy Science, 2017 Pregnancy per artificial insemination (P/AI) following Ovsynch is optimized when cows ovulate to the first GnRH of Ovsynch. Fertility programs are designed to presynchronize cows to d 6 or 7 of the estrous cycle to increase the chances of ovulation of a first-wave dominant follicle to the first GnRH of Ovsynch.
J P N Martins, T O Cunha, J R Pursley
exaly +3 more sources
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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
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 ...
V S Machado, F S Lima, R C Bicalho
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 ...
V S Machado, F S Lima, R C Bicalho
exaly +3 more sources
American Association of Bovine Practitioners Conference Proceedings, 2010
Fertility of lactating dairy cows has declined during the past 40 years yet fertility of heifers has remained constant. Lactating dairy cows have larger follicles and corpora lutea compared to heifers yet significantly less estrogen and progesterone concentrations in circulation.
Strickland, Jaimie +4 more
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Fertility of lactating dairy cows has declined during the past 40 years yet fertility of heifers has remained constant. Lactating dairy cows have larger follicles and corpora lutea compared to heifers yet significantly less estrogen and progesterone concentrations in circulation.
Strickland, Jaimie +4 more
openaire +1 more source
ANÁLISE DA EFICIÊNCIA REPRODUTIVA DOS PROTOCOLOS HORMONAIS PRESYNCH E OVSYNCH EM VACAS HOLANDESAS
Scientia GeneralisReproductive efficiency depends on reducing the calving interval through artificial insemination or natural breeding, leading to a higher conception rate in a shorter time. The Presynch and Ovsynch insemination protocols are the most commonly used.
Fernando Miller Sousa Rodrigues +2 more
openaire +1 more source
American Association of Bovine Practitioners Conference Proceedings, 2018
Fertility programs such as G6G and Double-Ovsynch improve reproductive performance in lactating dairy cows following first service compared to cows inseminated following estrus. However, implementation of these programs in dairy operations can be logistically challenging due to hormone treatments on 4 different days of the week, which increase labor ...
Martins, J. P. N. +3 more
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Fertility programs such as G6G and Double-Ovsynch improve reproductive performance in lactating dairy cows following first service compared to cows inseminated following estrus. However, implementation of these programs in dairy operations can be logistically challenging due to hormone treatments on 4 different days of the week, which increase labor ...
Martins, J. P. N. +3 more
openaire +1 more source
بررسی تأثیر برنامه Presynch-Ovsynch بر روی کارایی تولیدمثلی گاوهای شیری مبتلا به جفت ماندگی
2013زمینه مطالعه: جفت ماندگی کارایی تولید مثلی گاوهای شیری را کاهش میدهد. هدف: هدف از انجام این مطالعه بررسی تأثیر برنامه همزمانی فحلی Presynch Ovsynch، بر کارایی تولیدمثلی گاوهای مبتلا به جفت ماندگی در یک دامپروری گاو شیری در ایران بود. روش کار: این مطالعه بر روی 244 رأCس گاو شیری هلشتاین در یک گاوداری صنعتی در تهران انجام گرفت.
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