Results 1 to 10 of about 20,999,626 (255)

Modifications of the G6G timed-AI protocol improved pregnancy per AI and reduced pregnancy loss in lactating dairy cows

Animal, 2017
In dairy cows, subjected to a G6G protocol, objectives were to determine effects of (1) extending the interval from prostaglandin F2α (PGF2α) to gonadotropin-releasing hormone (GnRH) during presynchronization; and (2) adding a second PGF2α treatment ...
F. Heidari, E. Dirandeh, Z. Ansari Pirsaraei, M.G. Colazo   +3 more
doaj   +2 more sources

Impacts of estrus expression and intensity during a timed-AI protocol on variables associated with fertility and pregnancy success in Bos indicus-influenced beef cows. [PDF]

J Anim Sci, 2018
Rodrigues AD, Cooke RF, Cipriano RS, Silva LGT, Cerri RLA, Cruppe LH, Meneghetti M, Pohler KG, Vasconcelos JLM.   +8 more
europepmc   +2 more sources

Plasma concentrations of progesterone in the preceding estrous cycle are associated with the intensity of estrus and fertility of Holstein cows

PLoS ONE, 2021
The aim of this study was to determine the association between concentrations of progesterone (P4) during previous the estrous cycle with the intensity of spontaneous or estrogen-induced estrous expression and pregnancy per artificial insemination (P/AI).
Augusto M. L. Madureira, Tracy A. Burnett, Stefan Borchardt, Wolfgang Heuwieser, Christine F. Baes, Jose L. M. Vasconcelos, Ronaldo L. A. Cerri   +6 more
doaj   +2 more sources

Association between genomic daughter pregnancy rates and reproductive parameters in Holstein dairy cattle

Journal of Dairy Science, 2022
: The objective of this observational study was to evaluate the relationship between genomic daughter pregnancy rate (GDPR) with reproduction parameters such as pregnancy at first artificial insemination (AI), pregnancy per AI, and pregnancy losses (PL).
A.M.L. Madureira, J. Denis-Robichaud, T.G. Guida, R.L.A. Cerri, J.L.M. Vasconcelos   +4 more
doaj   +1 more source

GnRH analogs induce a LH peak and increase pregnancy per timed-AI in ewes.

Theriogenology, 2023
To date, there have been no studies testing the capacity of GnRH analogs and respective doses to induce a LH peak in sheep. In this sense, the present study aimed to evaluate the capacity of different synthetic forms and doses of GnRH in inducing LH ...
R. G. Pereira, O. S. Pires, Clério Antônio Hoefle, Alexandro Fritzen, Giovanna Fiordalisi, J. Ferst, F. D. de Oliveira, A. D. Vieira, R. Mondadori, Gabriel Maggi, M. Rovani, B. Gasperin, P. B. Gonçalves, Rogério Ferreira   +13 more
semanticscholar   +1 more source

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

Animals, 2021
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 ...
Christos Brozos, Evangelos Kiossis, Savvas Hatzieffraimidis, Anastasia Praxitelous, Ioannis Gouvias, Vasileios Kanoulas, Georgios Tsousis   +6 more
doaj   +1 more source

Synchronization of ovulation in crossbred dairy heifers using gonadotrophin-releasing hormone agonist, prostaglandin F2a and human chorionic gonadotrophin or estradiol benzoate [PDF]

Brazilian Journal of Medical and Biological Research, 2000
Girolando (Gir x Holstein) is a very common dairy breed in Brazil because it combines the rusticity of Gir (Bos indicus) with the high milk yield of Holstein (Bos taurus).
C. Castilho, A.L.G. Gambini, P. Fernandes, L.A. Trinca, A.B. Teixeira, C.M. Barros   +5 more
doaj   +1 more source

What Is the Most Cost-Effective Breeding Program for Lactating Dairy Cows—Timed AI, Estrous Detection, or a Combination of Both?

EDIS, 2014
As any other business enterprise, the sustainability of a dairy farm is highly dependent on economics. Reproduction influences both milk production and number of replacement heifers available on a farm; therefore, reproductive efficiency becomes a key ...
Klibs N. Galvão, Gustavo M. Schuenemann, Eduardo S. Ribeiro, Jose Eduardo P. Santos   +3 more
doaj   +5 more sources

Expression and detection of estrus in dairy cows: the role of new technologies

Animal, 2014
Despite the widespread adoption of hormonal synchronization protocols that allow for timed artificial insemination (AI), detection of estrus plays an important role in the reproductive management program on most dairies in the United States.
P.M. Fricke, P.D. Carvalho, J.O. Giordano, A. Valenza, G. Lopes, Jr, M.C. Amundson   +5 more
doaj   +1 more source

Equine chorionic gonadotropin treatment and timed artificial insemination for dairy cow production under heat stress

The Journal of Reproduction and Development, 2023
This study investigated the effects of timed artificial insemination (TAI) and equine chorionic gonadotropin (eCG) administration on lactating dairy cows under heat-stress conditions (average temperature-humidity index: 80). Timed artificial insemination
Daisuke FUNAKOSHI, Hidetoshi SHIOTANI, Makoto SEKI   +2 more
doaj   +1 more source