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Roberta Machado Ferreira
Researcher at University of São Paulo
Publications - 55
Citations - 2186
Roberta Machado Ferreira is an academic researcher from University of São Paulo. The author has contributed to research in topics: Embryo transfer & Pregnancy rate. The author has an hindex of 23, co-authored 55 publications receiving 1851 citations. Previous affiliations of Roberta Machado Ferreira include University of Wisconsin-Madison & Sao Paulo State University.
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Journal ArticleDOI
A new presynchronization system (Double-Ovsynch) increases fertility at first postpartum timed AI in lactating dairy cows.
Alexandre Hênryli de Souza,H. Ayres,H. Ayres,Roberta Machado Ferreira,Roberta Machado Ferreira,Milo C. Wiltbank +5 more
TL;DR: Presynchronization of cows with Double-Ovsynch increased fertility in primiparous cows compared to a standard Presynch protocol, perhaps due to induction of ovulation in non-cycling cows and improved synchronization of cycling cows.
Journal ArticleDOI
The low fertility of repeat-breeder cows during summer heat stress is related to a low oocyte competence to develop into blastocysts.
Roberta Machado Ferreira,H. Ayres,Marcos Roberto Chiaratti,M. L. Ferraz,A. B Araújo,C. A. Rodrigues,Yeda Fumie Watanabe,A.A. Vireque,D.C. Joaquim,Lawrence C. Smith,Flávio Vieira Meirelles,Pietro Sampaio Baruselli +11 more
TL;DR: These findings provide evidence of a greater sensitivity of RB oocytes to summer HS and suggest that the association of RB fertility problems and summer HS may potentially impair oocyte quality.
Journal ArticleDOI
Validation of body condition score as a predictor of subcutaneous fat in Nelore (Bos indicus) cows.
H. Ayres,Roberta Machado Ferreira,José Ribamar de Souza Torres-Júnior,Clarice Garcia Borges Demétrio,César Gonçalves de Lima,Pietro Sampaio Baruselli +5 more
TL;DR: In this paper, the relationship between body condition score (BCS) and rump fat thickness (RFAT) measured by ultrasonography was investigated by regression models and the analysis of similarity among the five obtained models was performed using the proc MIXED from SAS and the correlations among variables were analyzed with proc CORR from SAS.
Journal ArticleDOI
Equine chorionic gonadotropin and gonadotropin-releasing hormone enhance fertility in a norgestomet-based, timed artificial insemination protocol in suckled Nelore (Bos indicus) cows
M. F. Sá Filho,H. Ayres,Roberta Machado Ferreira,M. O Marques,E. L Reis,R. C. P Silva,C. A. Rodrigues,E. H. Madureira,Gabriel A. Bó,Pietro Sampaio Baruselli +9 more
TL;DR: ECG at norgestomet implant removal increased the growth rate of the largest follicle (LF) from implant removal to TAI, the diameter of the LF at Tai, and rates of ovulation and pregnancy rates, and GnRH at TAI improved the synchrony of ovulations andregnancy rates in postpartum Nelore cows.
Journal ArticleDOI
Presynchronization with Double-Ovsynch improves fertility at first postpartum artificial insemination in lactating dairy cows
M.M. Herlihy,Julio O. Giordano,A.H. Souza,H. Ayres,Roberta Machado Ferreira,Abdulkadir Keskin,A. B. Nascimento,J.N. Guenther,J.M. Gaska,S.J. Kacuba,Mark A. Crowe,Stephen T. Butler,Milo C. Wiltbank +12 more
TL;DR: Presynchronization with DO induced cyclicity in most anovular cows and improved fertility compared with PS, suggesting that DO could be a useful reproductive management protocol for synchronizing first service in commercial dairy herds.