78 Fertility in lactating dairy cows following timed artificial insemination or timed embryo transfer with fresh or frozen in vitro-produced embryos

2022 ◽  
Vol 34 (2) ◽  
pp. 275
Author(s):  
A. D. Crowe ◽  
J. M. Sánchez ◽  
S. G. Moore ◽  
M. McDonald ◽  
R. Rodrigues ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Embryo Transfer ◽  
Artificial Insemination ◽  
Lactating Dairy Cows ◽  
Timed Artificial Insemination

scholarly journals Efficacy of embryo transfer in lactating dairy cows during summer using fresh or vitrified embryos produced in vitro with sex-sorted semen

2011 ◽  
Vol 94 (7) ◽  
pp. 3437-3445 ◽  
Author(s):  
B.M. Stewart ◽  
J. Block ◽  
P. Morelli ◽  
A.E. Navarette ◽  
M. Amstalden ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Embryo Transfer ◽  
Lactating Dairy Cows

160 CONCEPTION RATES FOLLOWING TREATMENT OF LACTATING HOLSTEIN RECIPIENTS WITH A GONADOTROPIN RELEASING HORMONE (GnRH) ANALOGUE AT THE TIME OF TRANSFER OF OVUM PICK-UP/IVF-DERIVED EMBRYOS

2013 ◽  
Vol 25 (1) ◽  
pp. 228
Author(s):  
T. L. C. Pinto ◽  
J. N. S. Sales ◽  
R. R. Carvalho ◽  
T. M. França ◽  
J. C. Souza
Keyword(s):  
Dairy Cows ◽  
Embryo Transfer ◽  
Management Tool ◽  
Gnrh Analogue ◽  
Gnrh Analogues ◽  
Treatment Groups ◽  
Lactating Dairy Cows ◽  
Conception Rates ◽  
Day Of Embryo Transfer

The use of lactating dairy cows as ovum pick-up (OPU)/IVF-derived embryo recipients in large-scale embryo transfer programs may be limited by the effects of low progesterone concentrations on the uterine environment and subsequent embryo development. It was hypothesized that the injection of a GnRH analogue on the day of embryo transfer would induce ovulation and formation of an accessory corpus luteum, increasing progesterone concentrations and, as a result, conception rates. An experiment was designed to evaluate the effects of two different GnRH analogues injected IM on the day of embryo transfer on conception rates of lactating Holstein recipients. Oestrus was not synchronized and was detected continuously by multiple observers during the day and in the evening until midnight. Recipient days in milk varied from 45 to 150, daily milk production ranged from 20 to 45 kg, body condition scores and age ranged from 2.5 to 4.5 and 2.5 to 5.5 years, respectively. Herd pregnancy rates after the first artificial insemination ranged from 15% to 70%, considering the period the experiment was conducted. Embryos were produced by standard in vitro techniques following OPU on Holstein donors. Lactating Holstein recipients (n = 224) were allocated randomly to one of three treatment groups 7 days after detected oestrus: Control (n = 77) = vehicle; Buserelin (Sincroforte®, Ouro Fino, Sao Paulo, Brazil; n = 75) = 10 µg; and Deslorelin (Sincrorrelin®, Ouro Fino; n = 72) = 750 µg. Embryos were transferred nonsurgically 6 to 8 days after observed oestrus. Pregnancy was detected by ultrasonography between 62 and 72 days after embryo transfer. Percent pregnant data were analyzed as a binomial distribution under the GENMOD procedure of SAS (SAS Institute Inc., Cary, NC, USA). Conception rates were similar (P = 0.13) between Control (28%, 22/77), Buserelin (24%, 18/75), and Deslorelin (38%, 28/72) treatment groups. These data demonstrate that conception rates from in vitro produced embryos transferred to lactating dairy cows are not improved by treatment with a GnRH analogue on the day of transfer. Although not critically tested, results indicate that adequate conception rates may be obtained in commercial dairy operations from OPU/IVF-derived embryos, adding an important management tool for reproduction and animal breeding enhancement.

Use of sex-sorted sperm in lactating dairy cows upon estrus detection or following timed artificial insemination

2013 ◽  
Vol 143 (1-4) ◽  
pp. 19-23 ◽  
Author(s):  
M.F. Sá Filho ◽  
M.F. Mendanha ◽  
R.V. Sala ◽  
F.J. Carvalho ◽  
L.H.C. Guimarães ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Lactating Dairy Cows ◽  
Estrus Detection ◽  
Timed Artificial Insemination

scholarly journals Timed artificial insemination programs during the summer in lactating dairy cows: Comparison of the 5-d Cosynch protocol with an estrogen/progesterone-based protocol

2013 ◽  
Vol 96 (11) ◽  
pp. 6904-6914 ◽  
Author(s):  
M.H.C. Pereira ◽  
A.D.P. Rodrigues ◽  
T. Martins ◽  
W.V.C. Oliveira ◽  
P.S.A. Silveira ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Lactating Dairy Cows ◽  
Timed Artificial Insemination
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