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• W2578228157 abstract "It is well documented that presynchronization with progestins improves pregnancy rate to FTAI in Bos taurus breeds of cattle. The efficacy of presynchronization with progestins in Brahman-influenced breeds of cattle deserves further study. The objective of this study was to compare pregnancy rates resulting from fixed-time AI (FTAI) after synchronization with 1 of 2 controlled internal drug release (CIDR)-based protocols in peripubertal Brahman-influenced heifers. Crossbred heifers (n = 89) with varying degrees of Brahman-influence were equalized by breed, BW, and age across treatment groups (Pre-synch and Control). For 120 d, heifers were fed a diet consisting of ad libitum corn silage with supplemental feeding to meet NRC requirements for a moderate frame heifer gaining 0.8 kg BW per d. All heifers were fitted with an Estrotect (Rockway, Inc.; Spring Valley, WS), estrus detection patch on d -37. Also on d -37, Pre-synch heifers (n = 45) received a CIDR insert (Zoetis, Florham Park, NJ; 1.38 g of progesterone) for 14 d. On d -9, Pre-synch and Control (n = 44) heifers received GnRH (100 µg, intramuscularly; Cystorelin, Merial, Athens, GA) and a CIDR insert. On d -2, the CIDR insert was removed, PGF2α (25 mg, intramuscularly; Lutalyse, Pfizer Animal Health) was administered, and a new Estrotect patch was applied. All heifers were artificially inseminated and a second dose of GnRH was administered on d 0, 54 h after PGF2α injection. On d 30, pregnancy rates were determined by transrectal ultrasonography. Only 8 (9 %) of the heifers did not show signs of heat from d -37 to d -9. Heifers that displayed estrus within 54 h prior to breeding (34 %) were more likely to be pregnant (P < 0.05). Pregnancy rates for the main effect of synchronization protocol were not different (P > 0.1) at 27% and 16% for Pre-synch and Control groups respectively. Angus-influence heifers were more likely (P < 0.01) to become pregnant than non-Angus. Additionally, Pre-synch Angus-influenced heifers were the most likely (P < 0.05; 47 %) to become pregnant, and Control non-Angus heifers were least likely (9 %) to become pregnant. These results indicate that presychronization with progesterone for FTAI may be more effective on certain breeds." @default.
• W2578228157 created "2017-01-26" @default.
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• W2578228157 date "2016-12-01" @default.
• W2578228157 modified "2023-09-27" @default.
• W2578228157 title "008 Comparison of Heifer Conception Rates to Artificial Insemination after Synchronization with CO-Synch + Cidr with and without 14 d Cidr Pretreatment" @default.
• W2578228157 doi "https://doi.org/10.2527/ssasas2017.008" @default.
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