Artificial Insemination in Swine

Artificial Insemination in Swine Introduction The use of artificial insemination (AI) increased in these last years because it offers several advantages over natural mating. New genetics can be introduced into a herd with decreased health risks. The semen that is collected from the boar can be diluted in a semen extender and with one ejaculation multiple insemination doses can be created and can be used to breed several sows and gilts. This allows more extensive use of genetically superior boars, increasing the rate of genetic improvement within a herd. On farms employing artificial insemination few boars are needed, and as a consequence, feed, labour and housing costs are reduced. The major processes of AI are: semen collection, evaluation, and processing; detection of oestrus; and insemination. Reproductive physiology of female swine For successful artificial insemination, heat detection of the female swine is very important. Oestrus begins with the pituitary gland, which is a gland situated just below the brain. The pituitary gland secretes hormones into the bloodstream such as the luteinizing hormone (LH) and the follicle stimulating hormone (FSH), which are called gonadotropins. In immature gilts gonadotropin secretion is low, but at 6 to 8 months of age, when there is the 1st oestrus it increases dramatically. During the 2 to 3 day period just prior to oestrus, the increase of LH and FSH cause the follicles on each of the two ovaries to grow rapidly. The follicles secrete increased levels of estradiol, which is a hormone into the blood that causes changes in behaviour and physiology of the animal. These changes are associated with the oestrus. Each follicle contains an ovum. When the ovum is released and fertilised by a sperm cell, it develops into an embryo. The increase of estradiol concentration in the blood reaches a threshold which triggers a large release of LH from the pituitary gland around the onset of oestrus. The release of ova from the follicles into the oviducts is stimulated by the LH. On average, ovulation occurs 40 hours after the onset of oestrus. Fertilization of the ova by the sperm cells occurs in the oviducts, the tubes between the ovaries and the horns of the uterus, and then the fertilised egg moves to the uterus. The sites on the ovaries from which ova are released, then form structures that are called corpora lutea. These corpora lutea secrete the hormone progesterone into the blood. During the luteal phase of the oestrus cycle, which is approximately between day 4 and day 16, progesterone inhibits the secretion of LH and FSH from the pituitary gland, inhibiting follicular growth. When the ova are not fertilised during oestrus or embryos do not implant in the uterus, around day 16, the uterus starts t secrete the hormone prostaglandin-F2o into the blood. This hormone causes the falling off or death of the corpora lutea. This causes the progesterone level to decline and this allows the increase of LH and FSH levels, follicle growth, and the return of oestrus. In a female swine, oestrus occurs every 18 to 22 days, unless the cycle is interrupted by pregnancy, lactation, poor nutrition, disease, etc. If fertilisation occurs and pregnancy is initiated, the prostaglandin-F2o is not released in the blood stream. The corpora lutea are maintained and secrete high levels of progesterone into the blood stream throughout gestation. Progesterone is essential in pregnancy, as it inhibits follicular growth and uterine contractions. Around day 114 of gestation, the uterus releases a large amount of prostaglandin-F2o into the blood, and this causes the corpora lutea to regress. The progesterone level is then decreased, uterine contractions commence and the foetuses are expelled. During lactation, when the pigs are sucking from the sow, LH and FSH are not secreted. When the suckling are weaned, a stimulus allows the secretion of gonadotropin to increase and the follicles grow rapidly and there is the corresponding rise in the circulating levels of estradiol. The sows return in oestrus in seven days after weaning and estradiol elicits the surge of LH, causing ovulation. Detecting oestrus The detection of oestrus is very important for successful artificial insemination. The oestrus duration is variable, but the average is 38 hours in gilts and 53 hours for sows. With the high concentrations of estradiol several sign can show that the sow or gilt is approaching or is in oestrus. These signs are: a red, swollen vulva and enlarged clitoris, mucous discharge from the vulva, nervous and restless behaviour, moving back and forth along pen partitions, frequent urination, increased vocalisation, decreased appetite, mounting other females and/or standing to be mounted by other females, elevation of ears, locking knees, and elevating the back. The best indicator that female swine are in oestrus and ready to be mated is the immobilisation response. When in oestrus they exhibit the immobilisation response as a reaction to a combination of visual, auditory, olfactory and tactile stimuli originating from the boar. It is important to put a mature boar in contact with the female swine that are being checked for oestrus. The females should be checked at least twice a day, with 12 hours interval in between for more accurate determinations. When checking for oestrus, the female should be exposed to a boar for several minutes and observed closely for several signs. If the female re checked in the morning, this should be done before or at least one hour after feeding. Considerable energy expenditure is required for maintaining the immobilization response. If a gilt or sow that is in oestrus becomes fatigued, it may become unresponsive to boar exposure and not resume an immobilisation response for several hours. During periods when not checking for oestrus, the boar should be kept away from the females, because this greatly increases the likelihood that sows and gilts in oestrus will display the immobilisation response when exposed to the boar during the oestrus check. The boar exposure during oestrus checking should be restricted to small group of females. When the sows and gilts are housed in crates, a boar should be moved in the front of the females, while a second herdsman applies back pressure. If the female is in oestrus it move forward and assume immobilisation response and when pressure is applied to the back it will push back. This is an effective method of detecting oestrus. Inseminating females Disposable AI equipment should be used and catheters should only be used ones, so different equipment is used on different female swine to protect plant health. Before inseminating, the vulva should be cleaned with a paper towel and the tip of the catheter should be coated with a non-spermicidal lubricant. The lips of the vulva should be spread and the breeding catheter inserted. The catheter should be angled slightly upwards while moved through the reproductive tract. This helps prevent entry into the urethra, which is the tube leading to the bladder. After wards the catheter should be slid gently through the vagina until the operator feels resistance. The resistance indicates that the catheter has reached the cervix. With a spirette-type catheter the instrument should be turned counter-clockwise until it locks into the cervix. Then to remove the spirette, it should be turned clockwise while gently pulled outwards. With a foam-tipped catheter, firm forward pressure should be applied to the catheter until the bulbous tip is locked into the cervix, and to remove the bulbous catheter tip, it should be pulled outwards gently. After the semen and extender is mixed gently, the semen bottle, tube, or bag should be connected to the open end of the catheter. The semen is dispensed by gently squeezing the container over a three to five minute period, taking care to avoid excessive back flow of the extended semen out of the vulva. The tip of the catheter may be blocked against cervical tissues occasionally, blocking the flow of the semen, and if this happens the catheter should be repositioned by turning it. The insemination is easier if the female swine is exhibiting the immobilisation response, although it is not necessary. If a boar is placed in an adjacent pen, it can facilitate AI, but on the other hand, immobilisation response requires considerable energy expenditure and the female may become fatigued. When there is a large number of sows to be bred, some of them may become refractory to the boar stimuli prior to artificial insemination. When the boar is present during artificial insemination, the sows pituitary gland releases oxytocin into the bloodstream, which a protein hormone. It stimulates muscles contractions of the uterus and oviducts, and these contractions cause the semen to be drawn into the reproductive tract during AI. This is also known as self insemination. If the AI technician applies firm back pressure and rubs the flank or udder of the sow during insemination, he will facilitate the self insemination. Timing of insemination Accurate oestrus detection is the success of artificial insemination. Timing of insemination is normally based on the time when oestrus is first detected. Insemination should be done prior to ovulation, i.e. maximum 24 hours before ovulation in sows and maximum of 12 hours before ovulation in gilts. Inseminating twice during oestrus increases the likelihood that one will occur during the optimum time. If female swine are in standing heat for 3 days, a third mating should be beneficial. The females that are not in oestrus should not be inseminated because reproductive performance will be adversely affected.

Problem Statement Essay

Does audit rotation at diverse levels (accomplice level versus firm level) in distinctive settings (compulsory versus intentional) connected with improved audit quality. Taking into account our audit of the writing, it is a long way from indisputable whether mandatory audit firm or audit partner rotation can enhance audit quality, nor is it clear whether deliberate audit firm or partner revolution can substitute for obligatory audit rotation. Mandatory rotation may upgrade audit quality focused around the suspicion that turn brings a crisp viewpoint. Not with standing, mandatory rotation may be less compelling if the recently turned reviewers need sufficient learning of the customer. The loss of customer particular learning could possibly impede the viability and nature of the review. Intentional turn practices can be powerful in keeping up audit quality if an audit company business sector and financial impetuses for creating or keeping up a great notoriety surpass its monetary inves tments from submitting to the requests of particular customers. Generally, it is hazy whether the obligatory rotation of auditors is a powerful answer for upgrade audit quality. The degree to which intentional and obligatory auditor turns at diverse levels can substitute for one another in keeping up audit quality is thusly an observational inquiry. The above discourse prompts the accompanying examination question. Audit rotation at diverse levels (accomplice level versus firm level) and in diverse settings (compulsory versus willful) connected with higher audit quality in less created locales than in decently created locales. There is a developing writing that analyzes how institutional components influence audit quality crosswise over nations (Francis et al., 2003; Khurana and Raman, 2004; Choi and Wong, 2007; Francis furthermore Wang, 2008). Establishments shift a ton crosswise over China (e.g., Wang et al., 2008), which gives us with a chance to test whether institutional and market improvement elements, for example, the lawful environment and speculator insurance influence audit quality. Leeway of directing between provincial studies inside one nation is that we can catch the impact of foundations on audit quality free from pollution because of nation contrasts in bookkeeping and inspecting models, 14 assessment, and liquidation laws. As former writing (e.g., Francis et al., 2003; Khurana and Raman, 2004;Francis and Wang, 2008) recommends, auditors  may be more touchy to the expense of customer distorting and are more inclined to keep up audit quality as institutional administrations get to be stronger. In districts with well (less) created markets, the examiners may be all the more (less) prone to be worried about the potential impact of trading off audit quality on their legitimate risk and market notoriety. In this manner, there is less incremental interest for compulsory auditor rotation in well created areas. Conversely, mandatory audit rotation may be more vital in less created areas, which need business motivators or oversights to keep auditors determined and free. Consequently, we audit whether the impact of required or willful auditors rotation on audit quality is more claimed in less created areas than in decently created locales. This prompts our second research question. The relationship between customer particular information and audit quality. The inverse and clashing forecasts and discoveries in earlier studies on to the connection between audit tenure and audit quality may be attributable to the disappointment to together inspect directing elements, for example, auditor’s specialization, charges reliance, and auditor’s motivators (Doyle and Ge, 2007; Daugherty et al.,2012).therefore, the accompanying areas concentrate on recognizing the critical variables that may direct the relationship between audit rotation and audit quality. The relationship between mandatory auditor rotation and client-specific knowedge. Contentions for broadened auditor–client relations rest essentially on a mastery contention. Past exploration has reliably shown that auditor experience has a positive impact on audit quality (Dougherty et al., 2012). Case in point, Brazel et al. (2010) find that customer particular learning, an intermediary for auditor experience, builds auditors’ capacity to discover misrepresentation markers. On a related note, a few studies (e.g., Lenox, 1999) contend that non-audit activities performed by the audit firms has a tendency to prompt expanding the auditor’s experience and learning of the customer’s operations and environment, and thus expand the capacity to discover error in the budgetary explanations.Therefore,providing non-audit ativities to the customer can have a positive instead of a negative effect on audit quality.therefore,  required audit firm or audit partner rotations, specifically when there are no compelling information exchange techniques, may prompt the loss of both express and inferred client-specific knowledge, and thus to decreased audit quality. Audit quality be contrarily influenced when a lead partner who has picked up this particular information of the customer is supplanted. Auditor ndependence is the foundation of the auditing profession. Auditor independence alludes to the likelihood that auditors will report the error in money related explanations (Colbert and Murray, 1998) and the capacity of auditors to oppose weight from a client (Goldman and Barlev, 1974). Along these lines, auditors who have a high level of independence will have a high likelihood of distinguishing and reporting lapses or budgetary misquotes, and henceforth will have the capacity to focus the genuine status of the reviewed firm, i.e. make an excellent review (Deangelo, 1981; Colbert and Murray, 1998). One of the discussed components that influence auditor independence is auditor tenure. It is contended that more drawn out relationship between audit partner and their clients can make individual connections that make it more troublesome for the auditor to act independently of the inclination of the client (Deangelo, 1981). This is further disturbed by the dread of auditors of losing a relentless stream of future audit incomes, specifically from vital client who pay the auditor huge audit expenses. Likewise, this may lead auditors to agree to the client’s requests (Lim and Tan, 2010). Therefore, compulsory accomplice turn mitigates the closeness of the relationship between audit partner and their client, and improves the auditor’s capacity to oppose weight from administration. The consequences of this stream of exploration (e.g., Hattifield et al., 2011) propose that there is a positive relationship between audit firm/or audit partner rotation and the extent of proposed audit adjustment. Simnett and Carey (2006) likewise discover a negative relationship between auditor independence and the probability of issuing a going concern assessment as an intermediary of audit quality.hence it might be contended that auditor turn can improve auditor independence and hence expand the likelihood of distinguishing and reporting budgetary misquote

Fake Flesh Recipe for Costumes and Decorations

Use common kitchen ingredients to make non-toxic fake flesh or organs for Halloween and scary parties. Its a variation of a common slime recipe and has viscoelastic properties, so youll incorporate science into your decorations. Fake Flesh Ingredients 2 tablespoons corn starch4 teaspoons water2-5 drops red food coloring1/2 teaspoon cocoa mix (with marshmallows or without) How to Make Mix together the cornstarch, food coloring, and water in a bowl.After you have a smooth consistency, mix in the cocoa powder. Its okay if the cocoa forms little clumps (theyll look like blood clots).Use your fingers to press the mixture against the side of the bowl to form shapes. If you use your hands, youll get crumbly edges, so a mold (the bowl) is best for a smooth effect. You may wish to mix in a little more cornstarch or cocoa mix to firm up or darken your organs. Gruesome Tips and Tricks Mix in tiny bits of gelatin if you want a fatty appearance. Drizzle fake blood over the flesh as desired for extra gore. You can stick fake flesh and organs onto objects, clothing, or flesh using syrup or corn starch. The recipe actually tastes okay, so you can eat it for effect! Recipe Variations If you microwave this recipe, youll get rubbery flesh that wont fall apart when you put it in water. If you want a more flavorful flesh, use unsweetened cherry or berry drink mix instead of food coloring and cocoa. You could use the sweetened version, too, but the resulting flesh might be sticky.

The Old Nursery Rhyme, Ring Around The Rosie - 3205 Words

Introduction The old nursery rhyme â€Å"Ring around the Rosie† comes with many explanations relating to the Black Death and its course throughout Europe and Asia. Why is it that this old nursery rhyme, said to have been circulating since the last major epidemic of the Plague in 1665, is still being sung by countless amounts of people each day? This nursery rhyme and its continuation to appear in our childhoods and daily lives shows exactly how much the plague impacted today’s society socially, economically, religiously, and even philosophically. However, some may argue that the Plague was not related in any way, shape or form to present day society or any other period in time. The Black Death goes by many names and those names vary by time period and the timing of the particular epidemic. Many of these names include The Bubonic Plague, the Black Death, Black Plague, the Great Pestilence, the Great Mortality, La Pest (the Pestilence), and â€Å"the blue sickness† . The name bubonic comes from the Medieval Latin word bubo meaning a pustule, growth, or swelling. The names of the epidemics were not only inspired by the disease’s symptoms, but they were named after characteristics of the disease and the public’s general attitude towards the disease. For example, the name â€Å"the Great Mortality† originates from the amount of people who were inflicted with the disease and have fallen because of it. Origins of the Bubonic Plague The Black Death was considered to have many origins in theShow MoreRelatedThe History of Nursery Ryhmes Essay2503 Words   |  11 PagesThe History of Nursery Ryhmes When you think of nursery rhymes, do you think of innocent, silly games you played as a child? Think again. Most of the nursery rhymes that have become so popular with the children were never intended for them. Most began as folk songs or ballads sung in taverns. These songs (rhymes) all most always were written to make fun of religious leaders or to gossip about kings and queens (Brittanica pars. 1-5). Nursery rhymes are being studied the past few decadesRead MoreThe Plague or The Black Death Essay example1224 Words   |  5 PagesThucydides does not mention. The plague didn’t only affect people directly by sickness. Around the world, word of the plague spread from culture to culture. The children’s poem Ring Around the Rosie, is said to be about the plague. It is thought to have originated in England during the plague of London. The line â€Å"Ring around the Rosie† is about the swelling on the infected people’s skin. The Rosie is supposed to have been the reddish color surrounding the swelling, or the rash. The secondRead MoreWriting And Writing Of Writing952 Words   |  4 Pages Over my years of writing I have enhanced my expressiveness, originality, and creativity. Growing up, I loved writing poems. My love for poems developed from listening and loving nursery rhymes such as Twinkle Twinkle Little Star, Mary Had A Little Lamb, Ring around the Rosie, and many others. When I was five years old, I wrote and presented a poem of mine in my church auditorium with members present. I had anger proble ms growing up, and my psychologist taught me to let out my anger in differentRead MoreThe Black Death and The Song Ring Around the Rosie1288 Words   |  6 PagesSome things are not as they seem. â€Å"Ring Around the Rosie† seems like a pleasant children’s nursery rhyme, but many believe it is actually a grisly song about the Black Death in Europe. The Black Death was a serial outbreak of the plague during the 1300s. During the Black Death, more than 20 million Europeans died. One-third of the population of the British Isles died from the plague. Moreover, one-third of the population of France died in the first year alone, and 50% of the people in France’s