Vida Reprodutiva Consultoria Animal

Brazil

Vida Reprodutiva Consultoria Animal

Brazil
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Gimenes L.U.,São Paulo State University | de Carvalho N.A.T.,Agencia Paulista de Tecnologia e Agronegocios | Soares J.G.,University of Sao Paulo | Chiaratti M.R.,University of Sao Paulo | And 5 more authors.
Buffalo Bulletin | Year: 2013

The aim of the present study was to evaluate the effects of type of norgestomet auricular implant (new-N or previously used during 5 days-U), season of the year (summer-S and winter-W), and parity (12 heifers-H and 23 cows-C) on synchronization of follicular wave emergence in buffaloes. For this purpose, 35 buffaloes were examined daily by ultrasonography until follicular wave emergence was detected. Data were analysed by ANOVA, using PROC GLIMMIX. No interactions were observed in none variables. Time of follicular wave emergence and number of follicles at emergence were not affected by type of implant or season of the year. Parity also did not influence the number of follicles at emergence. However, follicular wave emergence occurred later in heifers than in cows. In conclusion, the previous use of a norgestomet auricular implant independent of the season of the year does not affect the time or the number of follicles at follicular wave emergence in buffaloes. Nevertheless, although heifers and cows had a similar number of follicles at emergence, the time of follicular wave emergence occurs earlier in cows than in heifers.


Gimenes L.U.,São Paulo State University | Macabelli C.H.,University of Sao Paulo | de Carvalho N.A.T.,Agencia Paulista de Tecnologia e Agronegocios | Soares J.G.,University of Sao Paulo | And 9 more authors.
Buffalo Bulletin | Year: 2013

The aim of the present study was to evaluate the effects of season of the year (summer and winter) and parity (heifers and cows) on oocyte quality and number in buffaloes. For this purpose, 71 buffaloes had follicular wave emergence synchronized before OPU. OPU of all follicles ≥ 2mm was done 5 days after the beginning of the hormonal protocol, in 4 replicates (two for each season). Data were analyzed by ANOVA using PROC GLIMMIX, in a 2 x 2 factorial arrangement of treatments. No interactions were observed in following variables: number of follicles, number of total and viable oocytes, recovery rate, percentage of viable oocytes, grade I oocytes, grade II oocytes, grade III oocytes, denuded oocytes, expanded cumulus oocytes, and atretic/ degenerated oocytes. Number of follicles visualized at OPU and recovery rate were not affected by parity or season. Relative to parity, number of total and viable oocytes were greater in heifers than in cows, respectively. Concerning season of the year, number of viable oocytes and viable oocyte rate were increased in winter. In conclusion, better oocyte quality can be obtained from heifers and during winter in buffaloes. However, the number of total oocytes seems to be more influenced by parity than by season of the year in this species.

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