Avaliação ovariana de novilhas girolando submetidas ao protocolo ovsynch em duas estações do ano
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2009-02-26
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Universidade Federal de Goiás
Resumo
The aim of this study was to describe the physiological responses to the Ovsynch
protocol in Girolando heifers breeding in extensive model on Centro-Oeste of
Brazil region and to determine relationships with environments factors in two
stations, dry and rain. This responses were describe through the characterization
of ovarian structures how: (NTL) total number of follicles; (DFOLIPR) mean of
follicular diameter on protocol s begin; (DFOLOV) ovulatory diameter follicles;
(DCL) corpus luteum ovulatory diameter; (SCL) ovulatory corpus luteum
brightness score; pregnancy rates and ovulation rate on day 9 obtained in two
year stations. Were utilized 40 heifers 18-24 months age, split in two groups of 20
animals being G1 group of dry station and G2 group of rain station. During the
evaluations were found differences for the total number of follicles 8,07±0,25 e
8,83±0,26 in two stations applied. The mean of follicular diameter on protocol s
begin was not show differences, but the measure of the ovulatory follicle diameter,
have differences for the year stations (P<0,01), being the diameter for the dry
station 11,88 ± 0,4mm whereas the rain station was 10,13 ± 0,36mm. Have in this
study, higher frequency of follicles that ovulate with 11 to 12 mm on dry station
and 10 to 11mm on rain station. The mean of the corpus luteum diameter on the
present study not differ among the stations (P>0,05), with10,46±0,41mm for the
dry station and 10,49±0,34mm for the rain station, being the higher frequency of
CL 11 to 12mm in both stages. The CL brightness score not have differ(P>0,05),
being 2,6 ± 0,16 for the dry and 2,31 ± 0,11 for the rain. The pregnancy rate have
differences on two stages (P<0,01) with values 45% and 11% on station dry and
rain respectively. The THI values differ among the stations dry and rain (P<0,01).
The ovulation rate on D9 do not differ (P>0,05) although to have numeric
differences. It was possible to conclude that in two stations evaluated, dry and
rain, have differences on follicular morfometry and pregnancy rates.
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Citação
BILEGO, Ubirajara Oliveira. Evaluation of ovarian girolando heifers subjected to the Ovsynch protocol in two seasons. 2009. 51 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2009.