Results 11 to 20 of about 712 (184)

INFLUENCE OF ESTRUS PRE-SYNCHRONIZATION ON REPRODUCTIVE VARIABLES IN KATAHDIN EWES CARRIERS OF THE GDF9 GENE [PDF]

Tropical and Subtropical Agroecosystems, 2023
Background: Genetic improvement in the sheep species focuses on increasing the number of offspring per sheep. Heritable characteristics such as ovulation rate, fertility, and prolificacy are desirable.
Dante J. Hernández-Rubio, María Del Carmen Navarro-Maldonado, Sergio S. González-Muñoz, Martha Hernández-Rodríguez, Miguel P. Conde-Hinojosa, César Cortez-Romero   +5 more
doaj   +2 more sources

183 Comparison of presynchronization and OvSynch protocols following fixed-time breeding in lactating dairy cattle [PDF]

J Anim Sci
Current study was carried out to compare two presynch-OvSynch protocols with standard OvSynch protocol in postpartum Holstein dairy cattle. Postpartum cows (n = 473) were randomly divided into one of the three protocols: I) G7G-OvSynch (n = 159), cows ...
A. Shahzad, R. S. Blouch, Shaista Abbas, S. Muhammad, I. Anwar, A. Abbas, M. Abbas   +6 more
europepmc   +2 more sources

Factors That Optimize Reproductive Efficiency in Dairy Herds with an Emphasis on Timed Artificial Insemination Programs [PDF]

Animals, 2021
Reproductive efficiency is closely tied to the profitability of dairy herds, and therefore successful dairy operations seek to achieve high 21-day pregnancy rates in order to reduce the calving interval and days in milk of the herd.
Carlos Eduardo Cardoso Consentini, Milo Charles Wiltbank, Roberto Sartori   +2 more
doaj   +2 more sources

Comparison of the effects of two pre-synchronization protocols (g6g and pg-3-g) on some reproductive performance parameters in holstein cows [PDF]

Eurasian Journal of Veterinary Sciences, 2020
Aim: The present study was aimed to determine effects of G6G and PG-3-G presynchronization protocols on some reproductive parameters in Holstein cows between postpartum 28-40 days.
Metehan Kutlu, Dursun Ali Dinç
doaj   +2 more sources

An investigation on the possibility of using eCG for presynchronization prior to ovsynch in dairy cow [PDF]

Iranian Journal of Veterinary Medicine, 2018
Background: Presynchronization could enhance fertility in timed breeding programs. The best presynchronization method has to justify biological requirements and to provide practical and economic advantages.
Amir Niasari-Naslaji, Hadi Kavousi Nodar, Mahdi Vojgani, Farid Heidari   +3 more
doaj   +2 more sources

Evaluation of presynchronization and addition of GnRH at the beginning of an estradiol/progesterone protocol on circulating progesterone and fertility of lactating dairy cows.

Theriogenology, 2019
The objectives of this study were to determine if the utilization of a presynchronization strategy would improve fertility at first artificial insemination (AI) during an E2/P4 ovulation synchronization protocol with or without GnRH administration at the
M. H. Pereira, M. Wiltbank, T. G. Guida, F. R. Lopes, B. Cappellozza, J. M. Vasconcelos   +5 more
semanticscholar   +2 more sources

Presynchronization with a progesterone device and prostaglandin F2α enhances ovulatory response to first GnRH, estrus expression and tended to increase fertility in beef heifers submitted to a 5-day CO-Synch protocol.

Theriogenology
The main objectives of the present study were to determine the effects of presynchronizing with a 1.0 g intravaginal progesterone device (IVPD) and prostaglandin F2α and to assess the effects of re-utilization of IVPD in a 2x2 factorial design, on the ...
T. Flores, J. M. Sánchez, I. Lopez-Helguera, E. Canadas   +3 more
semanticscholar   +2 more sources

Effect of presynchronization prior to Ovsynch on ovulatory response to first GnRH, ovulatory follicle diameter and pregnancy per AI in multiparous Holstein cows during summer in Iran

Annals of Animal Science, 2018
The aim was to evaluate the effect of presynchronization with GnRH and PGF2α prior to Ovsynch on ovulatory response to first GnRH, diameter of largest follicle at TAI and pregnancy per AI (P/AI) in multiparous dairy cows during summer. Cows (n=1069) were
E. Dirandeh, R. Masoumi, M. Didarkhah, F. Samadian, N. D. Davachi, M. Colazo   +5 more
semanticscholar   +2 more sources

Comparison of different GnRH compounds on fertility outcomes in ovulation synchronized and presynchronized beef cows [PDF]

Frontiers in Animal Science
This study evaluated the use of two different gonadotropin-releasing hormone (GnRH) compounds in estrus synchronization protocols with or without presynchronization.
Nicola Oosthuizen, Lucas M. Goncalves, Samir Burato, Molly S. Smith, Kelsey M. Harvey, Graham Cliff Lamb, Graham Cliff Lamb, Pedro L. P. Fontes   +7 more
doaj   +2 more sources

Short communication: Reproduction outcomes in dairy heifers following a 14-d progesterone insert presynchronization protocol

Journal of Dairy Science, 2019
The objectives were to evaluate pregnancy per artificial insemination (AI), days to first AI, and proportion pregnant within 7 d of AI eligibility in dairy heifers subjected to presynchronization compared with dairy heifers not presynchronized.
Bahman Shafii, W J Price
exaly   +2 more sources