Desenvolvimento folicular e ovulação de fêmeas Nelore (Bos taurus indicus) sincronizadas
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Data
2009
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Resumo
This work was developed to contrast the
follicular development in Nellore heifers and cows
submited to ovulation synchronyzation with norgestomet
(NOR) and estradiol benzoate (BE). Five
females of each category were submitted to the
following protocol: NOR implant in the ear with 2.0
mg of BE on day zero (D0), removal of implant on
D8, followed by the application of 0.5 mg of
cloprostenol. On D9 all the animals received a
second dose of 1.0 mg of BE. Ultrasound evaluations
were daily performed from D0 to D8; every
12 hours from D8 to D9 and every six hours of D9
until ovulation. The average diameter of the
ovulatory follicle was 8.02±0.39 mm for heifers
and 9.10±0.24 mm for cows, with difference
between two categories (p<0.05). The average
interval between beginning of the protocol and the
appearance of a new follicular wave was
3.80±0.37 days for heifers and 3.50±0.50 days for
cows. The ovulation occurred, on average,
40.6±1.47 hours for heifers and 41.50±3.77 for
cows after the second dose of BE. For these
intervals didn't have difference between two
categories (p>0.05). According these results we
can conclude that the follicular development of
Nellore heifers and cows submited to ovulation
synchronyzation with NOR and BE occur of similar
way, with the ovulatory follicle bigger in the cows.
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Palavras-chave
Benzoato de estradiol, Bovinos, IATF, Progestagens, Reprodução, Bovine, Estradiol benzoate, Progestins, Reproduction, TAI
Citação
FERRAZ, H. T.; OLIVEIRA FILHO, B. D.; GAMBARINI, M. L.; LOPES, D. T.; VIU, M. A. O.; REZENDE, L. C. Desenvolvimento folicular e ovulação de fêmeas Nelore (Bos taurus indicus) sincronizadas. Archivos de Zootecnia, Córdoba, v. 58, supl. 1, p. 585-588, 2009.