Results 11 to 20 of about 20,663,539 (299)

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

Progesterone-based timed AI protocols for Bos indicus cattle III: Comparison of protocol lengths.

Theriogenology, 2020
This study aimed to validate a 7 d progesterone (P4)-based fixed-time AI (FTAI) protocol for Bos indicus cattle by comparing to 8 and 9 d-type protocols. The first study compared 7 vs. 8 d protocols in Nelore heifers (Exp. 1.1; n = 742) and cows (Exp.
A. Prata, G. Madureira, A. Robl, H. Ribeiro, Milton Sagae, M. C. V. Elias, C. Pimenta, Jhonny Barrios, D. Hartmman, A. A. Schneider, Gabriel A F Sandoval, M. C. Wiltbank, R. Sartori   +12 more
semanticscholar   +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

Effect of GnRH 7 Days Before Presynchronization With Simultaneous PGF2α and GnRH on Reproductive Outcomes in Holstein Dairy Cows

Frontiers in Veterinary Science, 2020
We evaluated if an additional GnRH injection 7 days before pre-synchronization with simultaneous PGF2α and GnRH (PG+G) would improve responses to presynchronization, synchronization, and pregnancy per AI (P/AI).
Andrew M. Hubner, Andrew M. Hubner, Phillip M. G. Peixoto, Joshua Hillesheim, Igor F. Canisso, Igor F. Canisso, Fabio S. Lima, Fabio S. Lima   +7 more
doaj   +1 more source

Evolution of fixed-time AI in dairy cattle in Brazil [PDF]

Animal Reproduction, 2018
Various programs have been used to synchronize ovulation of a fertile oocyte, accompanied by fixed-time artificial insemination (FTAI). These programs involve a series of hormonal treatments to achieve four physiologic outcomes: 1) synchronize an ovarian follicular wave; 2) optimize conditions for ovulatory follicle development; 3) synchronize corpus ...
Vasconcelos, Jose Luiz Moraes, Pereira, Marcos Henrique Colombo, Wiltbank, Milo Charles, Guida, Thiago Guzela, Lopes, Francisco Rebolo, Sanches, Carlos Patricio, Barbosa, Lucas Furtado dos Santos Pereira, Costa, Wedson Maria, Munhoz, Anderson Kloster   +8 more
openaire   +3 more sources

What Is the Most Cost-Effective Breeding Program for Dairy Heifers—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. In order to obtain a profitable return on assets, there is a constant need to maximize outputs and, oftentimes, to minimize inputs.
Klibs N. Galvão, Eduardo S. Ribeiro, Jose Eduardo P. Santos   +2 more
doaj   +5 more sources

Timed artificial insemination in Serrana nanny-goats: the effects of vaginal specula and artificial insemination technicians

Revista Agrogeoambiental, 2023
The success of artificial insemination (AI) depends on the equipment used, especially regarding the facilitation of artificial insemination technicians’ work and the positioning of insemination guns in the genital tract of animals.
Hélder Miranda Pires Quintas, Daiane Moreira Silva, Paulo Jorge Pereira Afonso, Armindo de Carvalho Neves Álvaro, Óscar João Pinto Mateus, Ramiro Corujeira Valentim   +5 more
doaj   +1 more source

Physiological and practical effects of progesterone on reproduction in dairy cattle

Animal, 2014
The discovery of progesterone (P4) and elucidation of the mechanisms of P4 action have an important place in the history of endocrinology and reproduction.
M.C. Wiltbank, A.H. Souza, P.D. Carvalho, A.P. Cunha, J.O. Giordano, P.M. Fricke, G.M. Baez, M.G. Diskin   +7 more
doaj   +1 more source