Zobrazeno 1 - 10 of 61 pro vyhledávání: '"J.P.N. Martins"'
1
Akademický článek
Effect of using 200 μg of gonadorelin at the first gonadotropin-releasing hormone of the breeding-Ovsynch on ovulatory response and pregnancies per artificial insemination in first-service lactating Holstein cows
Autor: T.J. Valdés-Arciniega, I.M.R. Leão, E. Anta-Galván, T.O. Cunha, M.S. El Azzi, N.B. Cook, J.P.N. Martins
Publikováno v: Journal of Dairy Science, Vol 106, Iss 12, Pp 9718-9732 (2023)
ABSTRACT: This study aimed to determine whether 200 μg of GnRH (gonadorelin hydrochloride) would increase ovulatory response and pregnancies per artificial insemination (P/AI) compared with 100 μg at the first GnRH of the breeding-Ovsynch of a Doub
Externí odkaz: https://doaj.org/article/4940a40d07bc4617ba62d3130b4652a3
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2
Akademický článek
Presynchronization with prostaglandin F2α and gonadotropin-releasing hormone simultaneously improved first-service pregnancy per artificial insemination in lactating Holstein cows compared with Presynch-14 when combined with detection of estrus
Autor: J.P.N. Martins, T.O. Cunha, W. Martinez, J.S. Schmitt
Publikováno v: Journal of Dairy Science, Vol 106, Iss 7, Pp 5115-5126 (2023)
ABSTRACT: This study aimed to determine the effect of 2 simple breeding strategies combining artificial insemination (AI) after detection of estrus (AIED) and timed AI (TAI) on first-service fertility in lactating Holstein cows. Weekly, lactating Hol
Externí odkaz: https://doaj.org/article/57d6a18020014ebe9e0d6a4fe0127a98
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3
Akademický článek
Graduate Student Literature Review: Effects of human chorionic gonadotropin on follicular and luteal dynamics and fertility in cattle
Autor: T.O. Cunha, J.P.N. Martins
Publikováno v: Journal of Dairy Science, Vol 105, Iss 10, Pp 8401-8410 (2022)
ABSTRACT: Circulating progesterone concentrations during the growth of the ovulatory follicle and early embryo development have been positively associated with embryo quality and survival and pregnancy success. As a potent luteotropic agent with LH-l
Externí odkaz: https://doaj.org/article/52176e868cf24b479f4269a56347a83f
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4
Effects of GnRH and hCG administration during early luteal phase on estrous cycle length, expression of estrus and fertility in lactating dairy cows
Autor: Emil Walleser, Thiago O. Cunha, J.P.N. Martins, Walter Martinez
Publikováno v: Theriogenology. 173:23-31
Our objective was to determine the effects of a single treatment of human chorionic gonadotropin (hCG) or GnRH from d 5 to 7 of the estrous cycle on cycle length, expression of estrus and fertility in lactating dairy cows. Lactating Holstein cows (n
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::903a874bdd1daffb9cd6fbadb84a9fcf
https://doi.org/10.1016/j.theriogenology.2021.06.010
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5
Effect of PGF2α treatments during early corpus luteum development on circulating progesterone concentrations and ovulation in breeding-age Holstein heifers
Autor: Christian G. Piterini, J. Richard Pursley, Melisa J.T. Acevedo, J.P.N. Martins, Thiago O. Cunha
Publikováno v: Theriogenology. 173:12-18
The objective of this study was to test the effect of low circulating concentrations of progesterone (P4) on pre-ovulatory follicle development in heifers as part of an overarching objective to develop a model to understand this phenomenon in dairy c
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::54e858561d8f81fb4cbe8eccd487764f
https://doi.org/10.1016/j.theriogenology.2021.06.002
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6
Akademický článek
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7
Akademický článek
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8
Akademický článek
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9
Needs assessment for cooperative extension dairy programs in California
Autor: Betsy M. Karle, J.P.N. Martins, J.M. Heguy
Publikováno v: Journal of Dairy Science. 102:7597-7607
The present study aimed to identify dairy producer needs and how best to direct and deliver cooperative extension (CE) programming. In March 2017, we mailed a needs assessment survey to grade A dairy producers in California (n = 1,080). The response
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3b6953aa61e80548eebb2e10600c7db
https://doi.org/10.3168/jds.2018-15959
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10
Replacing the first gonadotropin-releasing hormone treatment in an Ovsynch protocol with human chorionic gonadotropin decreased pregnancies per artificial insemination in lactating dairy cows
Autor: J.P.N. Martins, Paul M. Fricke, T. Valdes-Arciniega, M.R. Lauber, E.M. Cabrera, M.S. El Azzi, T.R. Bilby
Publikováno v: Journal of dairy science. 104(7)
Our objective was to compare the effect of treatment with GnRH at the first treatment (G1) of the Breeding-Ovsynch portion of a Double-Ovsynch (DO) protocol with human chorionic gonadotropin (hCG) on pregnancies per artificial insemination (P/AI) in
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45c020107e4b8c02acff90e1c7a0636b
https://pubmed.ncbi.nlm.nih.gov/33838886
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