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- W2624494810 abstract "The present study aimed to evaluate the association between antral follicle count (antral follicle population, AFP) on estrus and pregnancy rates of Nelore cows. This study was performed in a commercial beef herd (Corrego do Meio), located at Alvorada-TO. A total of 291 cows were submitted to the same protocol to synchronize ovulation allowing for fixed-time artificial insemination (FTAI), starting on a random stage of the estrus cycle (Day 0). On Day 0, all females received an intravaginal progesterone (P4) device (DIB®, MSD Animal Health) and 2.0 mg intramuscular (IM) of estradiol benzoate (EB; Gonadiol®, MSD Animal Health). On Day 8, the P4 devices were removed simultaneously to 1.0 mg IM of estradiol cypionate (EC; E.C.P.®, Zoetis Animal Health), 0.530 mg IM of cloprostenol sodium (Ciosin®, MSD Animal Health) and 300 IU IM of equine chorionic gonadotropin (eCG; Folligon®, MSD Animal Health). All cows were fixed time artificially inseminated 48h after the P4 device removal (Day 10). Ultrasonography examinations (Mindray M5vet) were performed on Days 4, 8 and 10 of the FTAI protocol in order to count detectable follicles (>2.0 mm; AFP) and to measure the largest follicle at the P4 device removal (FOLD8) and immediately before the artificial insemination (FOLD10), respectively. To evaluate the occurrence of estrus, a tail-head chalk marker was used at the time of the P4 device removal, estrus occurrence was considered in females that had the chalk removed on Day 10 (FTAI). The pregnancy diagnosis was performed by transrectal ultrasonography exam 40 d after FTAI. Records were analyzed with the GLIMMIX procedure of SAS 9.3.®. Females were classified into three categories according to the AFP: 1. Low (28.8 ± 0.8), n=97; 2. Average (50.3 ± 0.7), n=97; and 3. High (74.7 ± 0.6), n=97. It was found that females with high AFP presented lower (P=0.002) diameter of FOLD8 (9.8 ± 0.3) compared to cows with average (11.0 ± 0.2) and low APF (10.7 ± 0.3). Additionally, reduced diameter of FOLD10 (P = 0.03) and estrus rates (P = 0.02) were observed among females with high AFP (11.7 ± 0.3 and 54.7%, 47/86) compared to females with average AFP (12.9 ± 0.3 and 76.6%, 59/77), with low AFP-cows having intermidiate results (12.1 ± 0.3 and 73.7, 61/83). However, similar pregnancy rates (P=0.44) were observed among the different APF categories (high: 45.4%, 44/97; average: 51.6%, 50/97; and low: 52.6%, 51/97). In conclusion, although cows with average AFP had follicles with greater diamenter on Days 8 and 10 and greater estrus rates compared to females with high AFP, AFP was not associated with pregnancy results of Nellore cows following timed artificial insemination." @default.
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- W2624494810 date "2014-03-11" @default.
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- W2624494810 title "Relationship between antral follicle population and pregnancy results following fixed-time AI in Nelore (Bos indicus) cows" @default.
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