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Strategic use of estrus intensity to combine timed artificial insemination and embryo transfer in large-scale cattle reproduction programs.
Theriogenology
January 2025
UEL - Universidade Estadual de Londrina, Londrina, PR, Brazil. Electronic address:
This study compared the reproductive performance of three different programs using conventional fixed-time artificial insemination (FTAI), fixed-time embryo transfer (FTET), and their combined use, considering estrus intensity as a criterion for the reproductive program. Brangus multiparous cows (n = 1.100), 40-50 days postpartum, 4-8 years old, and body condition scores 2.
View Article and Find Full Text PDFReBreed21-ET: Evaluation of a rapid resynchronization program that allows timed embryo transfer every 21 days.
Theriogenology
January 2025
Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI, 53706, USA. Electronic address:
This study evaluated the efficiency of a rapid resynchronization of ovulation program to allow timed embryo transfer (TET) every 21d in heifer embryo recipients. Holstein heifers (n = 510) had synchronized ovulation using a modified 5d CoSynch program for a TET (D7) after induced ovulation (D0). After TET, heifers were blocked by number of previous TETs and randomized into one of two resynchronization of ovulation programs: Resynch28 (n = 279), a traditional resynch program for TET 35d after previous TET; or ReBreed21-ET, a program designed to allow TET 21d after previous TET.
View Article and Find Full Text PDFImpact of luteal blood perfusion and expression of estrus on pregnancy rates of Bos taurus embryo recipients exposed to fixed-time embryo transfer.
Anim Reprod Sci
January 2025
University of Georgia, Department of Animal and Dairy Sciences, Athens, GA 30602, USA. Electronic address:
This study evaluated the impact of luteal blood perfusion (BP) and expression of estrus on pregnancy rates of Bos taurus embryo recipients exposed to fixed-timed embryo transfer (FTET) using a gonadotropin-releasing hormone (GnRH)- and progesterone-based ovulation synchronization protocol. Postpartum beef cows (n = 746) were exposed to a GnRH/progesterone-based ovulation synchronization protocol. Luteal morphometry and BP were assessed using color Doppler ultrasonography 9 days after CIDR removal concurrently with FTET.
View Article and Find Full Text PDFAging Oocytes: Exploring Apoptosis and Its Impact on Embryonic Development in Common Carp (Cyprinus carpio).
J Anim Sci
January 2025
Research Institute of Fish Culture and Hydrobiology, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice, Vodňany 389 01, Czech Republic.
Article Synopsis
- Ovulation, fertilization, and embryo development are critical processes whose success is compromised by post-ovulatory aging, leading to reduced oocyte quality and fertilization ability.
- The study focused on common carp and found that oocyte aging significantly triggers apoptosis, particularly noticeable after 48 hours post-stripping, with increased levels of pro-apoptotic genes and active caspase 3 enzyme.
- Although early blastula embryos (5 HPF) from both fresh and aged oocytes showed no signs of apoptosis, the embryos from aged oocytes at 24 HPF displayed heightened apoptosis, indicating a time-dependent effect of oocyte aging on embryonic development.
The walnut tree as a source of progesterone for reproductive control in goats.
Animal
January 2025
Physiologie de la Reproduction et des Comportements, CNRS, INRAE, Université de Tours, 37380 Nouzilly, France.
Intravaginal sponges impregnated with the progesterone (P4) analogue fluorogestone acetate (FGA) induce synchronous oestrous behaviour and normal ovulatory cycle in goats. To explore alternatives using natural P4 from plants, we developed a method of ethanolic extraction and a specific enzyme immunoassay (EIA) to measure P4 in the different parts of the walnut tree Juglans regia. We found a very high concentration of P4, specifically in the leaves of the three most common French varieties (∼100 mg/kg of DM) but not in flowers, fruits, septa, husk, oil or cake.
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