, 2010 Fertility of lactating dairy cows has declined during the past 40 years yet fertility of heifers has remained constant. Lactating dairy cows have larger follicles and corpora lutea compared to heifers yet significantly less estrogen and progesterone ...
Martins, Joao Paulo +4 more
core +1 more source
Efficiency Comparison between Two Systematic Breeding Protocols: Target Breeding and Presynchronization Program At a Large Central Valley Dairy Farm [PDF]
, 2012 As dairy herd sizes increase, dairymen often initiate systematic breeding programs on their dairy in order to improve their reproduction efficiency. The objective of this study, compares systematic breeding program by comparing reproductive efficiency ...
Alvernaz, Blake
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Sincronização do estro em vacas cíclicas: comparação de dois protocolos de inseminação a tempo fixo [PDF]
, 2016 Dissertação de Mestrado Integrado em Medicina VeterináriaNa tentativa de superar o obstáculo da diminuição da fertilidade nos bovinos de leite os protocolos hormonais para inseminação artificial a tempo fixo (IATF) têm vindo cada vez mais a ser ...
Canotilho, Joaquim António Cravina Ruas
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Revista Brasileira de Saúde e Produção Animal, 2007 The objective of this experiment was to evaluate the efficiency of the Ovsynch protocol in water buffalo cows, by the utilization of nafarelin like GnRH analogous and by the induction of the best moment to the protocol beginning through the ...
Ana Paula Mota Portela +4 more
doaj
, 2008 The objectives of this study were to evaluate the effects of method of presynchronization and source of supplemental Se on uterine health and reproductive performance of lactating dairy cows. Holstein cows (n = 512) were assigned randomly to 2 methods of
Santos, José E. P. +8 more
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Effect of One-Day Delaying CIDR Administration in 5-Day Cosynch Protocol in Dairy Heifers. [PDF]
Animals (Basel), 2021 Pancarci SM +3 more
europepmc +1 more source
Effect of a progesterone-releasing intravaginal device (PRID) for 8 days during a modified Ovsynch protocol on pregnancy outcomes in lactating Holstein cows. [PDF]
JDS Commun, 2023 Hölper M +4 more
europepmc +1 more source
Fertility after timed artific[i]al insemination in response to a Controlled Internal Drug Release (CIDR) insert in lactating dairy cows [PDF]
Master of ScienceDepartment of Animal Sciences and IndustryJeffrey S. StevensonLactating dairy cows from 2 Kansas farms were used to determine the effectiveness of exogenous progesterone in the form of an intravaginal insert (controlled internal drug ...
Martel, Cynthia Ann
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Risk factors for early and mid-to-late pregnancy loss and their effects on reproductive performance in dairy cows. [PDF]
J Vet SciKang HG, Jeong JK, Kim IH.
europepmc +1 more source
Synchronizace říje plemenic skotu a její úspěšnost
, 2019 Reproduction and milk production are considered to be the main factors influencing the whole economy of cattle breeding. We have been monitoring the worsening reproduction related to cattle breeding for a long time.
SUKOVÁ, Denisa
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