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- W2612037889 abstract "The objective of this study was to assess whether the timing of estrus expression impacts pregnancy per AI (P/AI) and pregnancy loss in Holstein dairy cows submitted to TAI program. Cows were synchronized receiving on D-11 relative to 2mg of estradiol benzoate (Gonadiol/Zoetis/Brazil) IM + 0.1 mg of gonadorelin (Fertagyl/MSD/Brazil) im + P4 intravaginal device (CIDR/Zoetis/Brazil); on D-4, 25mg of PGF (Lutalyse/Zoetis/SP/Brazil) was give im followed by CIDR removal + 25mg of PGF IM and 1 mg of ECP im (ECP/Zoetis /Brazil) on D-2 relative to TAI. At the time of CIDR removal cows were randomly allocated into 2 treatments: one received TAI 48 hours after CIDR removal (TAI), whereas the other treatment had cows inseminated 12h after estrus detection. When estrus was not observed, cows were inseminated at fixed time 48 hours after CIDR removal (ESTRUS). The variables P/AI and pregnancy loss were analyzed using PROC GLIMMIX. Pregnancy per AI was determined by US at 30 and 60d. There was no difference between treatments (TAI vs. ESTRUS) in P/IA at 30d (TAI = 36% [151/414] vs. Estrus = 34% [143/420]; P > 0.1), at 60d (TAI = 29% [122/414] vs. Estrus = 26% [110/420]; P > 0.1) and pregnancy loss between 30 and 60 days (TAI = 19% [29/151] vs. Estrus = 23% [33/143]; P > 0.1). There was no interaction between birth rate and treatment on P/AI at 30 and 60 d post insemination (P > 0.1). The distribution of estrus after CIDR was: 2% of the animals showed estrous 12 hours after CIDR removal, 48% of animals in 24h, 27% in 36h, 13% in 48h and 11% in cows that did not show signs of estrus. There was no treatment effect on P/AI at 30d regardless of the time of estrus expression after CIDR removal: 12h - TAI = 33% (2/6) vs. Estrus = 38% (3/8); 24h - TAI = 38% (71/188) vs. Estrus = 36% (74/203); 36h - TAI = 42% (48/113) vs. Estrus = 42% (45/108); 48hs - TAI = 37% (24/65) vs. Estrus = 29% (11/38). Cows that did not show signs of estrus P/AI on d 30 post AI lower (14% [12/86]) than cows that expressed estrus (38% [278/729]) regardless of treatment (P > 0.1). At 60d pregnancy were similar to the results observed on d 30 with: 12hs - TAI = 33% (2/6) vs. Estrus = 25% (2/8); 24h - TAI = 29% (55/188) vs. Estrus = 27% (55/203); 36hs - TAI = 37% (42/113) vs. Estrus = 33% (36/108); 48 hours - TAI = 28% (18/65) vs. Estrus = 29% (11/38). Cows that did not show signs of estrus had lower P/AI on d 60 (10% [9/86]) than the cows expressing estrus (30% [221/729]) regardless of treatment (P > 0.1). TAI protocol maintained pregnancy outcomes in cows inseminated in pre- determined time in relation to insemination 12 hours after estrus detection. Cows that expressed estrus had higher pregnancy outcomes than cows that did not show estrus." @default.
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- W2612037889 date "2016-03-01" @default.
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- W2612037889 title "The time of estrus expression impact on fertility of TAI protocols" @default.
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