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| Stuhr,Bhárbara Delboni; Gil,Isaac Santos; Lacerda,Tracy Ferreira; Favoreto,Mauricio Gomes; Loureiro,Bárbara. |
| ABSTRACT: The equine chorionic gonadotropin (eCG) is a glycoprotein produced in mare endometrial calices. In bovine, it is used in estrus synchronization protocols. However, studies have shown that it is potentially immunogenic and its effect can decrease after repetitive use. This study aimed to evaluate antral follicle dynamics, corpus luteum (CL) and ovulation rate in bos indicus cows submitted to an estrus synchronization protocol in association with eCG for eight times consecutively. Ten cyclical, multiparous, and pasture raised beef cows were divided into two groups: control group (n=5) and eCG group (n=5). In 30 day interval, all animals were synchronized with the same estrogen/progesterone based protocol, totalizing 8 re-synchronizations. Cows in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Corpus luteum; ECG; Fertility; Immunity; FTAI. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001102018 |
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| Frares,Luciana Ferri; Weiss,Romildo Romualdo; Kozicki,Luiz Ernandes; Santangelo,Renata Prestes; Abreu,Renata Azevedo de; Santos,Ivo Walter do; Dell'aqua Junior,José Antonio; Breda,José Carlos. |
| The aim of this work was to study estrus synchronization and fixed time artificial insemination (FTAI) in dairy buffaloes during season anestrus. One hundred thirty-nine dairy buffaloes in seasonal anestrus were divided in two groups as G1(n=66) and G2(n=73). The protocols for both the groups were the same until day (D)14:D0 administration of 2.0 mg estradiol benzoate and implantation of progesterone device (P4) for 14 days; D14 removal of P4 plus 150 mg of cloprostenol and 400 IU of equine chorionic gonadotropin. On D16, G1 received 10 mg of buserelin and G2 100 mg deslorelin acetate. On D17, both the groups were submitted to FTAI. Ultrasonographic examinations of ovaries were performed on D0, D14, D16 and D17. Results showed that pregnancy rates in G1... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Estrus Synchronization; Seasonal Anestrus; Dairy Buffaloes; Deslorelin; Buserelin; FTAI. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000400007 |
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| Schneider,Augusto; Pfeifer,Luiz Francisco Machado; Schmitt,Eduardo; Bianchi,Ivan; Vieira,Marcelo Brandi; Xavier,Eduardo Gularte; Del Pino,Francisco Augusto Burkert; Corrêa,Marcio Nunes. |
| The objective of this work was to evaluate the effect of insulin alone or in association with equine chorionic gonadotropin (eCG) on the fertility of postpartum beef cows subjected to synchronization. A total of 340 cows was subjected to fixed time artificial insemination. In the trial 1, the cows were subjected to temporary weaning (TW), while in the trial 2 the same protocol was tested without TW. The addition of an insulin injection to a progesterone/eCG-based protocol without TW increased the pregnancy rate of beef cows with body condition score (BCS) equal to or lower than 2.5. Insulin had no effect on cows submitted to TW or with BCS equal to or higher than 3.0. |
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Palavras-chave: Bos taurus; ECG; Insulin; FTAI; Weaning. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000023 |
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