Estrus induction with prostaglandin F2α, cloprostenol or fenprostalene during the normal estrous cycle, superovulation and after embryo collection

Desaulniers, Daniel; Guay, P.; Vaillancourt, Denis

doi:10.1016/0093-691x(90)90022-l

Cited by 9 publications

(1 citation statement)

References 38 publications

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“…The increase in the length of the open period following a superovulatory treatment is a limiting factor in embryo transfer in the cow. Induction of estrus by luteolytic agents after collection of embryos is used extensively to shorten the return to estrus in superovulated cows and has been attempted on different days after embryo collection (GREVE, 1978;JONES et al, 1986;ALI DINAR et al, 1987;DESAULNIERS et al, 1990;LUCY et al, 1990). Subsequent fertility did not improve after treatment with a prostaglandin analogue at the day of flushing (GREVE, 1978).…”

Section: Discussionmentioning

confidence: 99%

Embryo Survival Following Non‐Surgical Embryo Recovery in Superovulated Dairy Heifers

López‐Gatius

1995

Journal of Veterinary Medicine Series A

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Summary Embryo survival following non‐surgical embryo recovery was studied in 66 superovulated dairy heifers. Blood samples were collected at uterine flushing (6.5 days after a single AI), 72 h after flushing and then every 7 days until estrus or until pregnancy diagnosis by palpation per rectum. Luteolytic effect by uterine flushing was detected in three heifers 72 h following flushing (progesterone values < 1 ng/ml plasma). From the remaining animals 11 (17.5%) remained pregnant and 52 returned to estrus. In four heifers, embryo loss was registered 48 days after AI. Seven heifers developed gestation to term: five resulted in single and two in twin normal births. Progesterone concentrations in all samples from heifers in which embryo loss occurred were higher than in those with pregnancy to term. For non‐pregnant heifers, the average interval between uterine flushing and the following spontaneous estrus was 16.6 ± 1.3 days (± SEM). It was concluded that uterine flushing did not induce luteolysis in most heifers, and after uterine flushing, embryos remaining in the uterus were capable of developing through pregnancy to term.

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Section: Discussionmentioning

confidence: 99%

Embryo Survival Following Non‐Surgical Embryo Recovery in Superovulated Dairy Heifers

López‐Gatius

1995

Journal of Veterinary Medicine Series A

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Comparison of luteolysis and timed artificial insemination pregnancy rates after administration of PGF2α in the muscle or the ischiorectal fossa in cattle

Holland

Whittier

Clark

et al. 2018

Animal Reproduction Science

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Prostaglandin F (PGF) is commonly injected intramuscularly (IM) in female cattle in synchronization protocols. A novel site for administration of PGF that improves beef quality assurance is the ischiorectal fossa (IRF). The objective of this study was to determine whether administration of PGF in the IRF results in a similar physiological response to an intramuscular injection. Yearling angus-cross heifers (n = 112) were blocked by weight and randomly assigned within blocks to be injected with 5 mL PGF either IM in the neck or in the IRF. Blood samples taken at 0, 8, 16, 24, 36, and 48 h post-injection were analyzed for serum progesterone concentration using a radioimmunoassay. Progesterone concentration curves for each heifer were plotted to determine luteolysis. The median times to luteolysis for neck and IRF injections were 18.1 h and 20.0 h, respectively (p = 0.06). Angus cross commercial beef cows (n = 1471) at least 30 days post-partum were blocked by age and randomly assigned within blocks to be injected with 5 mL PGF either IM in the neck muscle or in IRF as part of a 7-Day CO-Synch + CIDR synchronization protocol. Pregnancy diagnosis was performed via ultrasound at 60 days post insemination. Results were analyzed with Proc Glimmix (SAS). Pregnancy rates for neck and IRF injections were 52.6% and 57.2%, respectively (p = 0.06). In summary, injection of PGF in the IRF for synchronization of estrus and luteolysis did not differ from IM injection. Utilizing the ischiorectal fossa as an injection site for PGF may serve as an alternative that more closely aligns with beef quality assurance.

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Two doses of prostaglandin improve pregnancy rates to timed-AI in a 5-day progesterone-based synchronization protocol in beef cows

Kasimanickam

Day²,

Rudolph

et al. 2009

Theriogenology

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Estrus induction with prostaglandin F2α, cloprostenol or fenprostalene during the normal estrous cycle, superovulation and after embryo collection

Cited by 9 publications

References 38 publications

Embryo Survival Following Non‐Surgical Embryo Recovery in Superovulated Dairy Heifers

Embryo Survival Following Non‐Surgical Embryo Recovery in Superovulated Dairy Heifers

Comparison of luteolysis and timed artificial insemination pregnancy rates after administration of PGF2α in the muscle or the ischiorectal fossa in cattle

Two doses of prostaglandin improve pregnancy rates to timed-AI in a 5-day progesterone-based synchronization protocol in beef cows

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