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• W2060735971 abstract "In order to enhance the use of biotechnology in females it is necessary to have good knowledge of the ovarian events, and thus enable the manipulation of the estrus cycle to concentrate ovulations in an established period of time. In this experiment, we evaluated the ovary response and corpus luteum (CL) parameters in a short-duration protocol associated or not to lecirelin (L)(GnRH) and/or estradiol benzoate (EB). Twenty-four cyclic Santa InÊs ewes were divided into 4 groups: Control animals (G1; n = 6) received 45 μg of d-cloprostenol (Prolise®, Tecnopec, Sao Paulo, Brazil) on Day 0. Intravaginal sponges containing medroxyprogesterone acetate (MAP60®, Tecnopec) were inserted on Day 3. Then on Day 7 sponges were removed and 400 IU of eCG and 45 μg of d-cloprostenol were administered. G2 (n = 6) animals underwent the same protocol as G1 but with administration of 1 mg of EB on Day 1; G3 (n = 6) animals underwent the same protocol as G1 but with administration of 25 μg of L (Gestran plus®, Tecnopec) 30 h after sponge withdrawal; G4 (n = 6) animals underwent the same protocol as G1 but with administration of 1 mg of EB on Day 1 and 25 μg of L 30 h after sponge withdrawal. Ewe ovaries were assessed via transrectal ultrasound (US), and CL were measured 4 days after ovulation. On the same day blood samples were taken to measure plasma progesterone levels via radioimmunoassay. Twenty-three out of 24 animals ovulated. One ewe from G4 that did not ovulate was taken out of the experiment. The average size of the largest pre-ovulatory follicle was 7.3 mm (G1), 7.0 mm (G2), 6.8 mm (G3), and 7.4 mm (G4) (P > 0.05). There were 1.8, 1.2, 2.0, and 1.4 ovulated follicles per animal in G1, G2, G3, and G4, respectively. The results for estrus start and duration after sponge withdrawal were G1: 32/38.6; G2: 37/69.3; G3: 29.3/37.3; G4: 44/68 h, respectively. Ovulation time span was G1: 65.3; G2: 88; G3: 53.3; G4: 82.4 h after sponge withdrawal. There was a high correlation of ovary mensuration and progesterone level (r = 0.64; P < 0.0001) on the fourth day after ovulation. Progesterone levels after ovulation were 2.37 ng mL-1 (G1); 1.5 ng mL-1 (G2); 3.22 ng mL-1 (G3) and 1.99 ng mL-1 (G4), being higher in G3 than in G2 (P < 0.05). It was seen that the EB is prejudicial to the CL function. Despite the fact that there was no significant difference of progesterone levels within G1, G3, and G4, animals in G3 displayed higher levels of progesterone; hence, there is a need for further studies using a larger number of animals and fertility test. CNPq e Tecnopec." @default.
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• W2060735971 date "2010-01-01" @default.
• W2060735971 modified "2023-10-02" @default.
• W2060735971 title "439 OVARY ULTRASOUND EVALUATION OF Santa Inês EWES SUBMITTED TO SHORT DURATION PROTOCOLS WITH PROGESTOGENS ASSOCIATED WITH LECIRELIN AND/OR ESTRADIOL BENZOATE" @default.
• W2060735971 doi "https://doi.org/10.1071/rdv22n1ab439" @default.
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