Results 11 to 20 of about 10,293 (262)

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

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

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

The applications of timed artificial insemination and timed embryo transfer in reproductive management of dairy cattle Aplicação da inseminação artificial e transferência de embrião em tempo fixo no manejo reprodutivo de vacas leiteiras

Revista Brasileira de Zootecnia, 2010
Fertility of dairy cattle is generally decreasing. Overall estrus detection efficiency in lactating dairy cattle is low, as expression of estrus is often compromised.
Divakar Justus Ambrose, Marcos Germán Colazo, John Patrick Kastelic   +2 more
doaj   +1 more source

Estrus Synchronization and Pregnancy Rate Using Ovsynch Method in Uganda Dairy Farms

Journal of Animal Reproduction and Biotechnology, 2017
The artificial insemination (AI) is one of the best assisted reproductive technologies for increasing reproductive capacity and facilitating the genetic improvement in farm animals.
Dae-Jin Kwon, Seok Ki Im, Hyun Kim, Hak-Kyo Lee, Ki-Duk Song   +4 more
doaj   +1 more source

Reproductive performance of early- and late-calving dairy cows artificially inseminated after ovulation synchronization and estrous resynchronization or artificially inseminated after observed estrus

JDS Communications, 2021
Within seasonal dairy systems, cows that calve late in the calving season are less likely to become pregnant and maintain a yearly calving interval. Very few studies have examined effective strategies for reproductive management of these late-calving ...
S.G. Moore, S.A. Hamilton, R. Molina-Coto, L.M. Mayo, R.O. Rodrigues, T. Leiva, S.E. Poock, M.C. Lucy   +7 more
doaj   +1 more source

Field comparison of GnRH and PGF2α treatments in cows not expressing estrus at timed-AI [PDF]

Arquivo Brasileiro de Medicina Veterinária e Zootecnia
RESUMO Objetivou-se comparar as taxas de prenhez (TP) e a perda gestacional (PG) de vacas sem expressão de estro (NEE), as quais receberam PGF2α ou GnRH no momento da IATF.
J.H.W. Diniz, A.C.B. Teixeira, R.F.G. Peres, R.B. Gois, E.C.R. Cunha, O.J. Escobar Jr, R.S. Carvalho, L.Z. Oliveira   +7 more
doaj   +1 more source

Type of CIDR but not eCG administration affected pregnancy per AI in Holstein heifers subjected to a 5-day estrus synchronization protocol

Journal of Applied Animal Research, 2022
This study compared the effects of CIDR type and eCG treatment on ovarian follicular dynamics, estrus response and pregnancy per AI (P/AI) in Holstein heifers subjected to a 5-d estrus synchronization protocol. On Day 0, heifers (n = 133) received either
Albina Sanz, Mohanathas Gobikrushanth, Marcos G. Colazo   +2 more
doaj   +1 more source