Dinâmica folicular por ultra-sonografía em novilhas pré-púberes da raça Gir
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Data
2005
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Resumo
The objective of this research was contribute to knowledge of reproduction physiology in the
Gir breed, by ultrasound study of follicular dynamic in prepubertal heifers. Follicular growth was monitored
in 13 heifers during 42 consecutively days. A process of successive anovulatory follicular waves was identiffied,
with each wave showing a dominant follicle and a variable number of other smaller in size (subordinates). The
waves were variables in length, for purposes of analysis, they were classified in three categories as follows:
waves of class 1 length (CO1: ≤12 days), class 2 (CO2: 13-16 days) and class 3 (CO3: ≥17 days). Forty-nine
waves were thus analyzed: 6 CO1 (12.2%), 31 CO2 (63.3%) and 12 CO3 (24.5%). Differences among length of
waves were observed, even between those from the same female. In the CO1 class the mean maximum diameter
of the dominant follicle was (P<0.05) shorter (9.4±0.3 mm) than CO2 (10.4±0.2 mm) and CO3 (11.6±0.4 mm).
The plateau and rates of growing and atresia of follicles were not different (P>0.05) between CO classes.
Similar characteristics on subordinate follicles were not different (P>0.05) among CO classes.
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Palavras-chave
Dinâmica folicular, Gir, Reprodução, Zebu, Follicular waves, Gir breed, Reproduction, Zebu cattle
Citação
SILVA, A. R. R.; REYES, A. de L.; GAMBARINI, M. L.; OLIVEIRA FILHO, B. D.; RUMPF, R. Dinâmica folicular por ultra-sonografía em novilhas pré-púberes da raça Gir. Archivos Latinoamericanos de Producción Animal, Maracay, v. 13, n. 2, p. 51-55, 2005.