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Showing 1 to 20 of 115 for “"Artificial insemination"”.
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Cervical artificial insemination in sheep
Results are reported from a fresh semen cervical artificial insemination trial in April 1989 at the Lincoln College Research Farm. One hundred and ninety Coopworth ewes were inseminated over 5 days. Semen was collected twice daily from four Dorset Down rams using an artifical vagina (A.V.). …
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Strategies to improve artificial insemination by donor
Artificial insemination with donor sperm is a widely accepted form of treatment for severe male factor infertility. The introduction of quarantined, cryopreserved semen and the associated reduction in cycle fecundity when compared to fresh semen necessitated the development of strategies to improve …
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The Influence of Artificial Insemination in Three Midwestern States
… cattle breeding. It is important that sires in artificial insemination be of genetic value superior to the population average. This is imperative when it is realized that through artificial insemination, a sire can be mated to many more cows than he could be naturally and over a much greater …
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Sperm cryopreservation and artificial insemination at Groote Schuur Hospital.
The diagnosis and therapy managed by the specialities of infertile couples is traditionally of Gynaecology and Andrology. The latter is a subspeciality, which should combine the knowledge of urologists and gynaecologists in the treatment of sub or infertile men.
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Enhancing Boar Reproductive Performance for Purposes of Artificial Insemination
… to a semen collection room equipped with an artificial sow. Upon entering the semen collection room, boars received in treatments of either deionized water (4 mL, n = 10) or Lutalyse at doses of 5 mg (n = 10), 10 mg (n = 10), or 20 mg (n = 10), and subsequently received a libido score of 1 to …
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Factors Important to the Efficiency of Artificial Insemination in Single-Ovulating and Superovulated Cattle
… identify factors important to the efficiency of artificial insemination in cattle, four studies were conducted. In the first study, the addition of cream to the inseminate was used in an attempt to increase accessory sperm number. On d 6 after insemination, 60 embryos were evaluated. The addition …
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The semen of the bull with special reference to its storage and transport for artificial insemination
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Animal Husbandry, 1948
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Oxytocin-induced cervical dilation in sheep: mechanism of action and potential use for nonsurgical artificial insemination
Exogenous oxytocin aids in the transcervical passage of an AI pipette into the uterus of ewes, and it may be an effective adjunct to sheep AI procedures. Experiments were conducted to evaluate the effects of oxytocin on variables that may affect fertility. The results of this study indicate clearly …
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A study of hormones and reproduction in male and female turkeys under natural mating or artificial insemination conditions
… concentrations due to natural mating or artificial insemination. Male body conformation did not significantly affect male mating efficiency, whereas male sex drive was correlated with efficiency. Female sex drive, while positively correlated with the number of attempted matings, decreased …
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Effects of ovulation-inducing drugs on pregnancy rates of cattle in rural areas after synchronized oestrus and artificial insemination
… when injected intramuscularly at the time-of artificial insemination (Al). Frozen-thawed Bonsmara and Nguni semen was used in synchronized cows of different ages, breeds and body condition scores (BCS). The main objective of this study was to evaluate the effect of oxytocin, PGF2a and hCG on …
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A Comparison of Intrauterine and Cervical Artificial Insemination Rods on Farrowing Rate and Litter Size in Artificially Mated Sows
This experiment compared the effects of two artificial insemination (AI) rods on farrowing rate and number of piglets born per litter. Three hundred eighty-nine sows were allotted into two experimental groups based on parity, body condition, and breed of sire influence of the sows. One hundred …
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Effect of Timing of Insemination and Synchronization of Estrus Method on Artificial Insemination (AI) Pregnancy Rates in Beef Heifers
Objectives were to evaluate time of insemination relative to estrus and synchronization with melengestrol acetate (MGA) plus prostaglandin (PG) or progesterone insert (CIDR) plus PG on AI pregnancy rate in beef heifers (n = 662) during Fall or Spring. Fall heifers (n = 349) received MGA-PG (MGA for …
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Comparison of controlled internal drug release (CIDR)-based protocols to synchronize estrus and facilitate artificial insemination (AI) in postpartum beef cows
Artificial insemination (AI) and estrous synchronization are reproductive technologies that enable beef producers to efficiently improve herd genetics. The recent development of protocols designed to synchronize estrus and ovulation enable producers to utilize fixed-time AI (FTAI), thus reducing …
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Comparison of Luteolysis and Timed Artificial Insemination Pregnancy Rates after Administration of PGF2a in the Muscle or the Ischiorectal Fossa in Cattle
… 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 PGF2α in the IRF for estrus synchronization and lysis of the corpus luteum …
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Impact of an artificial insemination programme on reproductive efficacy and the cross-breeding if indigenous South African goats with Boer goats in Vhembe District
… which efficient oestrous synchronization and artificial insemination (AI) protocols can be administered in the communal farming areas of Vhembe district. The first study aimed to determine the socioeconomic dynamics associated with establishing assisted reproduction centres designed and …
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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
… (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 + CIDR (n = …
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Bažnyčios įtaka įstatymų priėmimui Lietuvoje: Biomedicininių tyrimų etikos įstatymo ir Pagalbinio apvaisinimo įstatymo projekto atvejų studija /
… the Law on Ethics of Biomedical Research and the Artificial Insemination Bill, came back to political agenda almost on the same time – last year, but the outcome was totally different. In the Parliament session, where the Law on Ethics of Biomedical Research was unanimously passed, speakers …
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Liposome-Mediated DNA Transfer
… embryonic stem cells. The second method used artificial insemination with liposome-treated sperm in an effort to produce transgenic animals. The effects of high pressure on cell viability was examined in three cell lines in triplicate using forskolin stimulated cAMP production and trypan blue …
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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
We hypothesized that pregnancy outcomes may be improved by inducing luteal regression, ovulation, or both before a control CO-Synch + CIDR program (100 mcg GnRH i.m. [GnRH-1] and insertion of a progesterone-impregnated intravaginal controlled internal drug release [CIDR] insert on d -10, 25 mg …
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