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Showing 1 to 9 of 9 for “"fixed-time artificial insemination"”.
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Use of Triptorelin Acetate for Inducing Ovulation and Facilitating Fixed Time Artificial Insemination of Sows Weaned on Small-Scale and Niche Market Pig Farms
Developing a single fixed-time artificial insemination (FTAI) protocol would benefit small-scale and niche market pork producers by decreasing semen costs and labor associated with detection of estrus. The objective of this study was to test the efficacy of an artificial insemination (AI) breeding …
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Evaluation of the 7 and 7 synch protocol for control of the estrous cycle among beef cows prior to fixed-time artificial insemination with sex-sorted or conventional semen
… release (CIDR[copyright]) protocols prior to fixed-time artificial insemination (FTAI) of beef cows with conventional or sex-sorted semen. Cows (n = 1,538) were blocked based on age and days postpartum (DPP) and randomly assigned to protocol and semen type. Cows assigned to 7-day CO-Synch + …
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Presynchronizing injections of prostaglandin F[subscript]2alpha[subscript] or prostaglandin F[subscript]2alpha[ subscript + Gonadotropin-releasing hormone before a fixed time artificial insemination CO-Synch + CIDR program in suckled beef cows
… on d -3, and 100 mcg GnRH i.m. [GnRH-2] and timed AI [TAI] on d 0) in suckled beef cows. This hypothesis was tested in 2 experiments, in which cows were treated with either PG or PG + GnRH before initiating a control CO-Synch + CIDR program to increase the proportion of cows starting the …
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Interleukin-6 Supplementation Improves Post-Transfer Embryonic and Early Fetal Development of in vitro Produced Bovine Embryos
… A subset of cows from each group underwent fixed-time artificial insemination (AI) (n=37). The remaining cows underwent embryo transfer (ET) in the uterine horn ipsilateral to a corpus luteum (CL) (IL6 n=35; CONT n=51). Embryo and fetal measurements were performed via transrectal …
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The effects of resynchronization of estrus using the 5 d CO-Synch + CIDR system in beef heifers
… improved synchronization systems that facilitate timed insemination in beef cattle. However, synchronization systems utilizing a single fixed-time artificial insemination (FTAI) frequently result in 25-40% non-pregnant heifers. The purpose of this study was to determine the effectiveness and …
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Factors affecting the quality and function of the bovine periovulatory follicle
… experiment evaluated incidence of ovulation, time to ovulation, and ovulatory follicle size in crossbred angus heifers administered GnRH either epidurally or intramuscularly. Heifers were randomly assigned to treatment and ovaries were visualized every 4 h via transrectal ultrasound until …
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Strategies for Improving Reproductive Efficiency of Beef Cattle with Assisted Reproductive Technologies
… the bull:cow ratio for natural service after fixed time artificial insemination (FTAI) can alleviate economic burden associated with FTAI. In experiment 1, the total number of cows exposed per bull was negatively correlated with pregnancy rate to natural service on first return to estrus after …
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Supplementation of Chromium Propionate Positively Impacts Reproductive Performance of Beef Females
… interval to achieve pregnancy success on time is a considerable obstacle for beef females. Chromium supplementation increases available glucose and insulin sensitivity within cells. Two experiments were conducted to investigate the effects of supplementing Chromium propionate (CrP) during …
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The Effects of a GnRH Antagonist, Cetrorelix, on Ovarian Function in Cattle
… goal is to engineer an alternative protocol for fixed-time artificial insemination that is simple, steroid-free, and effective during different stages of the estrus cycle. Two studies were conducted to determine the effects of a GnRH antagonist, cetrorelix, on the follicular dynamics in cattle …