Results 251 to 260 of about 22,219,032 (293)

Hormonal combinations aiming to improve reproductive outcomes of Bos indicus cows submitted to estradiol/progesterone-based timed AI protocols.

Theriogenology, 2021
The aim was to study reproductive outcomes of Nelore (Bos indicus) cows submitted to a 7-d estradiol (E2)/progesterone (P4)-based timed artificial insemination (TAI) protocol, receiving various combinations of doses and hormones.
R. Alves, Mateus A. Silva, C. Consentini, L. O. Silva, N. Folchini, Abraham L. Oliva, A. Prata, J. R. Gonçalves, M. Wiltbank, R. Sartori   +9 more
semanticscholar   +1 more source

Early resynchronization of non-pregnant beef cows based in corpus luteum blood flow evaluation 21 days after Timed-AI.

Theriogenology, 2020
The study aimed to verify whether a hormone protocol started at Day 13 (D13) after Timed Artificial Insemination (TAI) influences the conception rate. Nelore cows (primiparous and multiparous) from two commercial beef farms (n = 1,431) were first TAI (D0)
M. Palhão, A. C. Ribeiro, A. Martins, C. R. B. Guimarães, R. D. Alvarez, M. F. Seber, C. Fernandes, J. P. Neves, J. Viana   +8 more
semanticscholar   +1 more source

Comparison of the effects of two shortened timed-AI protocols on pregnancy per AI in beef cattle.

Theriogenology, 2020
The objective was to compare pregnancy per AI (P/AI) between two shortened timed-AI (TAI) protocols in beef cattle. This study also determined whether administration of eCG in heifers and timing of AI in cows would affect P/AI.
K. Macmillan, M. Gobikrushanth, A. Sanz, D. Bignell, G. Boender, L. Macrae, R. Mapletoft, M. Colazo   +7 more
semanticscholar   +1 more source

Progesterone-based timed AI protocols for Bos indicus cattle II: Reproductive outcomes of either EB or GnRH-type protocol, using or not GnRH at AI.

Theriogenology, 2020
The aim of these experiments was to study ovarian dynamics and fertility of Bos indicus beef cattle submitted to 7-d progesterone (P4)-based fixed-time AI (FTAI) protocols using different hormonal treatments. In Exp.
G. Madureira, C. Consentini, J. Motta, J. Drum, A. Prata, P. Monteiro, L. F. Melo, J. R. Gonçalves, M. Wiltbank, R. Sartori   +9 more
semanticscholar   +1 more source

Anti-Mullerian Hormone and its relationship to ovulation response and fertility in timed AI Bos indicus heifers.

Reproduction in domestic animals = Zuchthygiene, 2020
This study evaluated the association between plasma anti-Mullerian hormone (AMH) concentration and fertility in Nelore (Bos indicus) heifers submitted to timed artificial insemination (TAI). At the onset of the synchronization protocol, heifers (n = 289)
E. Batista, L. Vieira, B. G. Freitas, B. M. Guerreiro, J. G. S. Carvalho, Rodolfo D. Mingoti, G. Vasconcellos, A. H. Souza, Jose Bento Sterman Ferraz, Pietro Sampaio Baruselli   +9 more
semanticscholar   +1 more source

Effect of presynchronization with prostaglandin F2α before the 5-d timed AI protocol on ovarian responses and pregnancy in dairy heifers.

Theriogenology, 2019
The objectives were the determine the effects of presynchronization with PGF2α 2 days before the 5-d timed artificial insemination (AI) protocol on ovarian responses and pregnancy per AI (P/AI) in dairy heifers. The hypothesis was that PGF2α would induce
E. Karakaya-Bilen, E. Ribeiro, R. Bisinotto, A. Gümen, J. Santos   +4 more
semanticscholar   +1 more source

Factors influencing pregnancy per artificial insemination (AI) and embryonic mortality in Nelore females subjected to timed-AI in Brazil.

Animal Reproduction Science
A greater understanding of factors influencing fertility is essential to improve pregnancy rates and reduce the occurrence of embryonic mortality in beef herds.
L. G. da Silva, Luana Gomes da Silva, Luiz Carlos Louzada Ferreira, Júlia Mascarello, J. G. N. Moraes, M. C. Lucy, É. Nogueira   +6 more
semanticscholar   +1 more source

Effect of sperm kinematics and size of follicle at ovulation on pregnancy rate after timed AI of beef cows.

Animal Reproduction Science, 2019
The objectives of this study were to evaluate whether the diameter of the preovulatory follicle and the post-thaw sperm kinematics are factors that affect successful establishment of a pregnancy after timed AI (TAI) of postpartum beef cows.
L. Pfeifer, Jair Sábio Oliveira, J. R. Potiens   +2 more
semanticscholar   +1 more source

Comparison of pregnancy outcomes using either an Ovsynch or a Cosynch protocol for the first timed AI with liquid or frozen semen in lactating dairy cows.

Theriogenology, 2018
S. Borchardt, L. Schüller, L. Wolf, C. Wesenauer, W. Heuwieser   +4 more
semanticscholar   +1 more source

Diagnosis of timed patterns for discrete event systems by means of state isolation

Automatica, 2023
Dimitri Lefebvre, Zhiwu Li, Ye LIANG
exaly