1269 Profitability of dairy cows receiving first service timed artificial insemination after the Double-Ovsynch protocol with a voluntary waiting period of 60 or 88 d

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 612-612
Author(s):  
M. L. Stangaferro ◽  
R. Wijma ◽  
M. Masello ◽  
G. E. Granados ◽  
J. O. Giordano
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Waiting Period ◽  
Timed Artificial Insemination ◽  
Voluntary Waiting Period

scholarly journals Effect of two prostaglandin injections on days 5 and 6 in a timed AI protocol after estrus expression on pregnancy outcomes in dairy cows during cold or hot seasons of the year

2019 ◽  
Vol 62 (1) ◽  
pp. 161-170
Author(s):  
Mufeed A. Alnimer ◽  
Mohamed A. Abedal-Majed ◽  
Ahmad I. Shamoun
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Pregnancy Outcomes ◽  
Dairy Herd ◽  
Control Treatment ◽  
Estrus Detection ◽  
Timed Artificial Insemination ◽  
Observation Period ◽  
Synchronization Protocol ◽  
Voluntary Waiting Period

Abstract. The objective of this study was to test whether prostaglandin (PG) injection on day 30 postpartum (pp) and detection of estrus can affect the efficacy of injecting PG on days 5 and 6 in the timed artificial insemination (TAI) protocol on pregnancy rate in a large dairy herd in hot or cold seasons. Out of 2235 cows, 1998 received an injection of PG at 30±3 d pp and estrus was observed. Cows that displayed estrus during the estrous observation period after PG injection were classified as estrus (E), while those that did not show estrus were classified as nonestrus (NE). Cows in each group were assigned to two treatments: CO-72 (control treatment) (ECO-72 and NECO-72) (day 44 GnRH, day 51 PGF2α, day 54 GnRH+TAI) or PG–PG (EPG–PG and NEPG–PG) (day 44 GnRH, day 49 PGF2α, day 50 PGF2α, day 52 GnRH+TAI). Pregnancy was diagnosed on days 33 and 47 after artificial insemination (AI). The proportion of cows in estrus on the day of TAI was higher (P≤0.05) for cows that received two PG than for cows that received one PG. Pregnancies per AI (P/AI) on days 33 and 47 for cows inseminated during and after a voluntary waiting period in the NEPG–PG treatment had higher rates than for cows in the EPG–PG, ECO-72 and NECO-72 treatments. Moreover, P/AI were significantly (P≤0.05) affected by parity. Primiparous had higher P/AI (37.0 %) than multiparous cows (31.6 %). Cows inseminated in cold months had higher P/AI and reduced PL (35.6 % and 20.8 %) than cows inseminated in hot months (29.1 % and 30.6 %, respectively). In conclusion, treatments with PG on days 5 and 6 after the first GnRH injection increased P/AI. Estrus detection before the beginning of TAI protocol did not affect fertility. To maximize P/AI cows exhibiting heat at any time during the synchronization protocol should be inseminated.

scholarly journals REDUCTION OF THE VOLUNTARY WAITING PERIOD BY USE OF HORMONAL PROTOCOLS AND FIXED-TIME ARTIFICIAL INSEMINATION (FTAI) IN DAIRY COWS

2012 ◽  
Vol 17 (3) ◽  
Author(s):  
Miriane Suplicy ◽  
Haroldo Suplicy Filho ◽  
Luiz Ernandes Kozicki ◽  
José Carlos dos Santos Breda ◽  
Romildo Romualdo Weiss ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Pregnancy Rate ◽  
Artificial Insemination ◽  
Post Partum ◽  
Fixed Time ◽  
Estradiol Benzoate ◽  
Control Group ◽  
Waiting Period ◽  
Equine Chorionic Gonadotropin ◽  
Voluntary Waiting Period

ABSTRACT: The aim of this study was to reduce the waiting voluntary period in dairy cows by administration of two different hormonal protocols for estrus synchronization and fixed-time artificial insemination (FTAI). One hundred twenty-eight Holstein dairy cows were studied. Three groups (G) were carried out: G1 (44 treated), G2 (34 treated) and G3 (50 as control). In the treated cows the following hormonal protocols was applied between 40 and 45 days post partum: G1- Day 0 (D0) - bovine intravaginal device containing progesterone (P4) plus 1.0 mg of estradiol benzoate (EB), D8 - removal of the P4, plus 0.5 mg of cloprostenol plus 400 IU of equine chorionic gonadotropin (eCG), D9 - 1.0 mg of EB and FTAI after 36 hours. G2 - D0 - P4 intravaginal plus 50 mcg of gonadotropin-releasing hormone (GnRH), D7 - removal of the P4 plus cloprostenol plus 400 IU eCG; D9 - 50 mcg of GnRH and FTAI 16 hours after. G3 – Control group inseminated 12 hours after the visual estrus. Results: G1 and G2 were inseminated (FTAI) respectively in the D55.5 and D56.8 after calving, while the G3 in the D84.5 (p<0.01).  The pregnancy rate in the G1, G2 and G3 was respectively 47.0, 46.1 and 35.8% (p>0.05).  In Conclusion: there was significant reduction in the voluntary waiting period in treated cows and higher pregnancy rate although not significant.

LRH‐A3 and HCG increase pregnancy rate during timed artificial insemination in dairy cows

2021 ◽  
Vol 92 (1) ◽  
Author(s):  
Peng Zheng ◽  
He Huang ◽  
Xiaoyu Li ◽  
Fushuo Huang ◽  
Samson Olugbenga Adeniran ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Pregnancy Rate ◽  
Artificial Insemination ◽  
Timed Artificial Insemination

1270 Profitability of dairy cows managed for first service with the Double-Ovsynch or Presynch-Ovsynch protocol and different duration of the voluntary waiting period

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 612-613
Author(s):  
M. L. Stangaferro ◽  
R. Wijma ◽  
M. Masello ◽  
G. E. Granados ◽  
J. O. Giordano
Keyword(s):  
Dairy Cows ◽  
Waiting Period ◽  
Voluntary Waiting Period

scholarly journals Use of on-farm milk progesterone information to predict fertility outcomes in dairy cows subjected to timed artificial insemination

2020 ◽  
Vol 103 (7) ◽  
pp. 6600-6611
Author(s):  
B.O. Omontese ◽  
G.C. Gomes ◽  
A.R. Santos ◽  
L.G. Silva ◽  
V.R. Merenda ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Timed Artificial Insemination ◽  
On Farm
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