Life Sciences Commons^™

The Prevalance And Distribution Of Eimeria Species Found In Sheep In Van, Abdurrahman Gül, Serdar Değer

Turkish Journal of Veterinary & Animal Sciences

This study was performed to investigate the presence of Eimeria species in the sheep population of Van. Stool samples were collected from 350 sheep in 10 geographically distinct locations (Van-centre, Saray, Çaldıran, Erçek, Edremit, Gürpınar and Güveçli, Bardakçı, Alaköy, Kavuncu villages) in Van province. Nine different Eimeria species were found in the examination of the stool samples. These species were E. parva (46.57%), E. ovinoidalis (43.14%), E. ahsata (39.42%), E. ovina (39.14%), E. crandallis (38.85%), E. pallida (33.14%), E. granulosa (16.57%) E. faurei (15.42%) and E. intricata (11.42%).

Changes In Quality Of Pickled Pike-Perch (Sander Lucioperca Bogustkaya & Naseka, 1996) In Fridge Conditions, Mehmet Çeli̇k, Ahmet Gerek

Turkish Journal of Veterinary & Animal Sciences

Chemical, physical and sensory changes in the fridge condition of Pike-Perch, pickled in various salt concentrations (15%, 20% and 25%), were investigated in this study. During the storage period, a significant decrease in the amount of crude protein and lipid as well as an increase in dry matter and crude ash values were observed in all groups. However, a decrease in protein and lipid levels occurred depending on salt concentrations (p

Effect Of Vitamin E Supplementation On The Level Of Milk And Plasma Vitamin E And Thiobarbituric Acid Levels Of Milk, Ö. Hakan Muğlali, Nurcan Çeti̇nkaya, Ayhan Güler, Uğur Gögüş, Serap Ulutürk

Turkish Journal of Veterinary & Animal Sciences

In the study, the effect of various amounts (200 and 400 mg/head) and administration routes (intra-muscular or per-os) of vitamin E on blood and milk vitamin E levels and thiobarbituric acid (TBA) levels of milk was determined. A total of 50 Akkaraman sheep with a control and four treatment groups each containing 10 animal were used in the study. Weekly intra-muscular (IM) injections were administered over two months. Blood samples were collected at 15 day intervals a month after the administration and blood and milk samples were collected weekly for two months after the end of the administrative period. In …

Studies On The Age, Growth And Reproduction Characteristics Of The Chub, Leuciscus Cephalus Orientalis, (Nordmann, 1840) In Karasu River, Turkey, Orhan Erdoğan, Mustafa Türkmen, Ayhan Yildirim

Turkish Journal of Veterinary & Animal Sciences

This study is based on the examination of 759 chubs from Karasu River (40° 45´ 33´´ E, 39° 56´ 16´´ N) between November 1995 and October 1997. This population comprised seven age groups of males and nine of females. The second age group was dominant in the population. Individuals were composed of 50.46% males and 49.54% females. The male and female ratio was 1:1.019 (M:F). The Von Bertalanffy growth parameters and length-weight relationships were; L_t = 35.8765 (1-e^{-0.1241(t+1.16660)}), W_t = 583.2981 (1-e^{-0.1241(t+1.16660)})^{2.952}, W = 0.0150 FL^{2.952} in males and L_t = 41.4154 (1-e^{-0.1160(t+1.3207)}), W_t = 936.3338 (1-e^{-0.1160(t+1.3207)})^{2.980}, W = 0.0142 …

Comparison Of In Vitro Dry Matter Degradation Of Four Maize Silages Using The Menke Gas Production Method, Adem Kamalak, Yavuz Gürbüz, Heather Finlayson

Turkish Journal of Veterinary & Animal Sciences

Four maize silages from the UK and France were evaluated using the gas production method to estimate the rate and extent of dry matter degradation in vitro. There were significant differences in gas production after 17 h incubation. The silages showed similar times to produce 50, 95 and 100% of total gas production, whereas the lag time for Ema was significantly (P < 0.001) lower than that for Volgate. The potential gas production value (a + b) for Nancis was significantly (P < 0.05) lower than that for Volgate. There was a significant correlation (r = 0.996, R^2 = 90.71, P < 0.001) between gas production and total VFA production. There were considerable differences in the fermentability of carbohydrates between different maize silages. Nancis and Ema had more readily fermentable carbohydrate, which yielded high propionate production and a shorter lag time. 6196 and Volgate had more slowly fermentable carbohydrate, which did become available to microorganisms but after a longer lag time.

Etomidate/Alfentanil Anaesthesia In Dogs And Its Effects On Pulse Oxymeter, Electrocardiography And Haematological Parameters, E. Cem Perk, Özlem Güzel, Erol Güçlü Gülanber

Turkish Journal of Veterinary & Animal Sciences

In this study, the anaesthetic effects and reliability of the combination of etomidate, which is a non-barbiturate injectable anaesthetic, and alfentanil, which is a strong narcotic analgesic, in anaesthesia induction in dogs were investigated. Twenty dogs were used in this study. Following intramuscular administration of atropine at a dose of 0.05 mg/kg, diazepam was given intravenously at a dose of 0.5 mg/kg. Following tranquillisation, etomidate at a dose of 2mg/kg and alfentanil at a dose of 0.02mg/kg were injected intravenously. With this anaesthetic protocol, anaesthesia lasting approximately 15 min was produced. When haematological parameters (haemogram and ALT, AST, BUN, TP, …

The Effect Of Concentrate Feeding Levels On The Postweanining Performance Of Holstein Friesian Calves, Mete Yanar, Olcay Güler, Bahri̇ Bayram

Turkish Journal of Veterinary & Animal Sciences

The influences of different levels of concentrate on the growth characteristics of Holstein Friesian calves reared under an original calf-rearing program were investigated in this study. Forty-one new-born calves (20 male and 21 female) were allocated to the four concentrate groups: 2, 2.5, 3 kg/calf and ad libitum. The calves were weaned at 5 weeks of age, and the trial lasted for 6 months. The results with regard to weights at 6 months of age revealed that an increasing amount of concentrate supplementation resulted in a significantly (P < 0.01) higher live weight. Furthermore, daily weight gains between birth and 6 months of age was also significantly higher (P < 0.01) in the ad libitum group than in the 2, 2.5 and 3 kg/day groups. The highest overall gains in body measurements, for example body length and heart girth, were obtained from calves fed concentrate ad libitum. However, feed efficiency ratios were not significantly influenced by the various amounts of concentrate offered to calves. The overall results suggest that the appropriate level of concentrate for the new calf-rearing program should be ad libitum.

Annual Cycle Of Serum Gonadal Steroids And Serum Lipids In Capoeta Capoeta Umbla, Güldenstaedt, 1772 (Pisces: Cyprinidae), Orhan Erdoğan, Hali̇l İbrahi̇m Hali̇loğlu, Abdulkadi̇r Çi̇ltaş

Turkish Journal of Veterinary & Animal Sciences

Seasonal changes in serum concentrations of the testosterone in males, 17\beta-estradiol in females and triglyceride and cholesterol in both sexes of Capoeta capoeta umbla were determined. Peak concentrations of testosterone (2.828 ± 0.278 ng/mL) and 17\beta-estradiol (3.182 ± 0.116 ng/mL) occurred in May. The concentrations of testosterone and 17b-estradiol were significantly correlated with the gonadosomatic index in both sexes. After the spawning period, steroid hormone levels significantly diminished (P < 0.05). The triglyceride concentration was highest in April (607.611 ± 30.146 mg/dL). The serum cholesterol level showed a rising trend until April and reached peak values during this month (393.000 ± 8.991 mg/dL). In the spawning month (May), a significant decrease was observed in triglyceride and cholesterol concentrations (P < 0.05). These results suggest that seasonal changes in both serum lipids and steroid hormones were associated with reproductive activity in C. c. umbla.

Estimation Of Genetic Distance In Meat And Layer Pure Lines Using Randomly Amplified Polymorphic Dna, Rahşan İvgi̇n, Güldehen Bi̇lgen

Turkish Journal of Veterinary & Animal Sciences

The purpose of this study was to evaluate genetic similarities and distances among pure lines of poultry using the RAPD technique. In this study four layer and three meat type pure lines were used. Venous blood samples from five males and five females of each line were collected from the venae cutenea ulnaris. The RAPD technique was used to generate a DNA fingerprint of lines. Initially, a total of 35 primers having arbitrary sequences were used for RAPD analysis. The amplicons were resolved on 1.5% agarose gel and stained with ethidium bromide. To evaluate the bands, polymorphic and monomorphic bands …

Lens Abnormalities In Slaughtered Holstein And Brown Swiss Beef Cattle In Konya, Zeki̇ Oğurtan, Cengi̇z Ceylan, İlhami̇ Çeli̇k, Emrah Sur

Turkish Journal of Veterinary & Animal Sciences

A total of 1000 beef cattle were examined after being slaughtered, of which 373 were Holstein and 627 were Brown Swiss. The high incidence of lens abnormalities was observed to be as follows: coloboma (20.4%), microphakia (6%) and cataract (3.9%) in Holsteins for a total incidence rate of 30.3%, and coloboma (5.6%), microphakia (2.6%) and cataract (4.2%) in Brown Swiss for a total incidence rate of 12.4 %. Holsteins were more frequently affected than Brown Swiss with coloboma and microphakia, but not with unilateral cataract formation. These animals were generally fed different ratios of beet pulp, hay, molasses and barley …

Effects Of Milk Replacer On Kid Growth And Farm Profitability In The Shami Goat, Mahmut Keski̇n, Osman Bi̇çer

Turkish Journal of Veterinary & Animal Sciences

This experiment was conducted to compare the kid growth and doe milk production under kid suckling and milk replacer (MR) regimes. Thirty does with single kids were randomly assigned into two equal groups (15 kids per group): the control group, where kids suckled freely, and the MR group, where kids were fed with MR containing 21% fat and 22% protein. Kids were weighed at birth, at 15, 30, and 45 days of age and at weaning at the age of 60 days. The growth rate of kids, and the 60-day and lactation milk yield of dams were not statistically affected …

Effects Of Progesterone And Testosterone On The Hyaluronidase Activities And Sperm Characteristics In Sheep, Sadetti̇n Tanyildizi, Tanzer Bozkurt

Turkish Journal of Veterinary & Animal Sciences

The aim of this study was to determine the effects of progesterone and testosterone hormones on the hyaluronidase activities of serum and semen and on sperm characteristics in sheep. Thirty healthy Akkaraman sheep were used. The progesterone and testosterone were injected intramuscularly at the rate of 0.5 mg/kg and 5 mg/kg, respectively. Then the blood and semen samples were obtained from the sheep at 1, 2, 4, 24, 48, 72 and 168 h. The serum hyaluronidase activities of ewes and rams in progesterone and testosterone groups increased significantly (p < 0.01, p < 0.001) when compared with the control groups at all times. Additionally, there were significant (p < 0.001) increases in the levels of semen hyaluronidase activity in the progesterone group except at 4 h. Furthermore, semen hyaluronidase activities in the testosterone group were detected to decrease significantly (p < 0.01) in comparison with the control rams except at 4 h. The use of progesterone and testosterone caused a significant (p < 0.05, p < 0.01) increase in spermatozoa motility, respectively. However, sperm concentrations were determined to decrease significantly (p < 0.01, p < 0.001) in both groups. Although the values for semen volume decreased significantly (p < 0.05, p < 0.01) in the progesterone group, the same values were observed to increase significantly (p < 0.01) in the testosterone group except at 48 h when compared with the control groups. The results of this study showed that there were no significant correlations between semen hyaluronidase activities and sperm characteristics. In conclusion, the use of both hormones did not have any deleterious effects on hyaluronidase activities but for the semen samples in the testosterone groups. However, progesterone and testosterone hormones cause harmful effects on the fertilization ability of rams due to decreased sperm concentration values.

Occurrence Of A Sawback Angelshark (Squatina Aculeata Cuvier, 1829) Off The Eastern Mediterranean Coast Of Turkey, Nuri̇ Başusta

Turkish Journal of Veterinary & Animal Sciences

A specimen of Squatina aculeata (sawback angelshark) was caught in a trawl on 15 May 1997 in Iskenderun Bay at about 120-200 m depth and recorded for the first time from the eastern Mediterranean coast of Turkey. Thus, a new species of fish was recently added to the chondrictyes fish fauna in the eastern Mediterranean Sea off Turkey.

Weight-Length Relationships For Selected Fish Species Of The Small-Scale Fisheries Off The South Coast Of İskenderun Bay, Mehmet Fati̇h Can, Nuri̇ Başusta, Mustafa Çeki̇ç

Turkish Journal of Veterinary & Animal Sciences

In this study a series of weight-length relationships are presented for 13 fish species caught between September and December 2000 off the south coast of İskenderun Bay. The samples were collected with longlines. The values of the exponent b in the weight-length relationship, W = aL^b, ranged from 2.391 to 3.675 and the median value was 2.714.

A New Fish Record From Turkish Seas: The Blackfin Sorcerer Nettastoma Melanurum Rafinesque, 1810 (Nettastomidae), Nuri̇ Başusta, Cemal Turan, Mevlüt Gürlek

Turkish Journal of Veterinary & Animal Sciences

Two and five specimens of the blackfin sorcerer, Nettastoma melanurum, were trawled on 25 and 30 April 2001 respectively at Samandağ, Hatay (36º10'N, 35º20'E; 36º05'N, 35º40'E) at about 80-200 m depth. It is recorded for the first time from the eastern Mediterranean coast of Turkey. Thus, a new species and family have been added to the fish fauna in Turkish seas.

First Case Report Of Dioctophyme Renale (Goeze, 1782) In A Dog In İstanbul, Turkey, Ayşen Gargili, İbrahi̇m Firat, Müfi̇t Toparlak, Handan Çeti̇nkaya

Turkish Journal of Veterinary & Animal Sciences

A female specimen of Dioctophyma renale was recovered from the abdominal cavity of a stray dog necropsied in Istanbul, Turkey on 8 June, 1999. The nematode was 55.5 cm in lenght, with a diameter of 0.7 (0.6-0.8) cm. This is the first case report of D. renale from Turkey.

Avipox In A Common Buzzard (Buteo Buteo), Özlem Özmen, Gerry M. Dorrestein

Turkish Journal of Veterinary & Animal Sciences

An adult, male common buzzard (Buteo buteo) with a leg fracture and multiple proliferative cutaneous nodules on its feet was brought to Akdeniz University Burdur Veterinary Faculty by a farmer who found the bird at his farm. There were similar small nodules on the eyelids and beak. The fractured bone ends had become necrotized. The buzzard was euthanized. On histopathological examination of nodules, large, eosinophilic intracytoplasmic inclusion bodies (Bollinger bodies) were seen. Avipox was diagnosed on the basis of the typical gross and microscopic features.

Histological Investigations On The Effects Of Feeding With A Diet Containing Red Hot Pepper On The Uropygial Gland Of A Rooster, Berri̇n Zik, Hati̇ce Erdost

Turkish Journal of Veterinary & Animal Sciences

In the present study, differences occurring in the uropygial glands of roosters fed with a diet containing red hot pepper from 1-day old until 5-months old, were investigated in their histological and morphometrical aspects. It was determined in the experimental group that the lipid content of cells in the sebaceous zone of the uropygial gland was more than that of the controls, and the thicknesses of the tubulus walls and the length of the tubulus increased depending on both age and the effect of red hot pepper. It was observed that in the cells of the glycogen zone; while glycogen …

Cu, Zn, Pb And Cd Content In Some Fish Species Caught In The Gulf Of Antalya, Meltem Yazkan, Feramuz Özdemi̇r, Muharrem Gölükcü

Turkish Journal of Veterinary & Animal Sciences

In this study Cu, Zn, Pb and Cd contents were analyzed in liver and muscle tissues of ten fish species (Mullus barbatus, Mugil cephalus, Trachurus trachurus, Pagellus acarne, Dicentrarchus labrax, Sparus auratus, Sardinella aurita, Boops boops, Scomber japonicus, Solea solea) caught in the Gulf of Antalya in January, February and March 2000. Cu and Zn contents were found to be 0.51-3.66 mg/kg and 3.17-11.36 mg/kg in fish muscles and 0.83-4.44 mg/kg and 3.97-15.14 mg/kg in liver tissue respectively. Pb and Cd, important heavy metals for human health, were found at levels of 0.00-2.05 mg/kg and 0.00-0.13 mg/kg in fish muscle …

Proximal And Distal Epiphyseal Growth Of The Humerus In German Shepherd (Alsatian) Puppies, Gülsün Pazvant, Defne Bacinoğlu, Vedat Onar

Turkish Journal of Veterinary & Animal Sciences

In this study, a total of 23 humeri of German shepherd puppies of ages between 40 and 100 days were used. It was observed that the proximal and distal epiphyseal regions were not closed and even the epiphysis was partially spongious. The width of the epiphyseal plate and epiphysis were not equal and they reached the same level with age. There were variations between the epiphysis widths of the right and left humeri and the differences between these values were statistically significant. When the right and left humeri measurements were analysed for correlation with each other, a significant high positive …

Investigations On The Possibility Of Improving The Meat Production By Crossbreeding Turkish Merino, Chios And Kıvırcık Sheep Breeds 2. Fattening, Slaughter And Carcass Characteristics Of Lambs, Alper Yilmaz, Mustafa Özcan, Bülent Eki̇z, Münevver Akgündüz

Turkish Journal of Veterinary & Animal Sciences

The Turkish Merino is the most common mutton breed in Turkey. In this study the Turkish Merino was used as a sire line for the production of two-way and three-way crossbred slaughter lambs. Our aim was to investigate improvements in the meat production of these crossbred lambs. In this part of the study, the fattening, slaughter and carcass characteristics of two-way and three-way crossbred lambs were taken into consideration in comparison with those of Turkish Merino purebred lambs. The inspected live weights at the end of fattening were 37.6 kg, 37.8 kg and 37.4 kg for Turkish Merino x Kıvırcık, …

Immunoblot Analysis Of Campylobacters Of Chickens, Mehmet Akan, Jale Erdeğer, Zi̇ya İlhan

Turkish Journal of Veterinary & Animal Sciences

The aim of this study was to determine immunogenic structures by immunoblotting in thermophilic Campylobacter strains isolated from chickens. The bands obtained from C. jejuni strains were found to be distributed between 10.8 and 116.5 kD by SDS-PAGE analysis of whole cell proteins. The bands 78, 63, 52, 48.5, 43.5, 29.8, 25.6, 22, 18.5, 17.2 and 16.5 kD were detected as the major common bands in all C. jejuni strains. Electrophoretic analysis of C. coli strains revealed that protein band profiles ranged between 10.3 and 118 kD, and 76, 63-62, 52, 48.5, 44 and 30.5 kD bands were all major …

Type-Specific Inositol 1,4,5-Trisphosphate Receptor Localization In The Vomeronasal Organ And Its Interaction With A Transient Receptor Potential Channel, Trpc2, Jessica H. Brann, John C. Dennis, Edward E. Morrison, Debra A. Fadool

Biology: Faculty Publications and Other Works

The vomeronasal organ (VNO) is the receptor portion of the accessory olfactory system and transduces chemical cues that identify social hierarchy, reproductive status, conspecifics and prey. Signal transduction in VNO neurons is apparently accomplished via an inositol 1,4,5-trisphosphate (IP3)-activated calcium conductance that includes a different set of G proteins than those identified in vertebrate olfactory sensory neurons. We used immunohistochemical (IHC) and SDS-PAGE/western analysis to localize three IP3 receptors (IP3R) in the rat VNO epithelium. Type-I IP3R expression was weak or absent. Antisera for type-II and -III IP3R recognized appropriate molecular weight proteins by SDS-PAGE, and labeled protein could be …

Hydrothermal Venting Along Earth's Fastest Spreading Center: East Pacific Rise, 27.5°–32.3°, E. T. Baker, R. N. Hey, J. E. Lupton, J. A. Resing, R. A. Feely, J. J. Gharib, G. J. Massoth, F. J. Sansone, M. Kleinrock, F. Martinez, D. F. Naar, C. Rodrigo, D. Bohnenstiehl, D. Pardee

Marine Science Faculty Publications

During March/April 1998 we conducted detailed mapping and sampling of hydrothermal plumes along six segments of Earth's fasting spreading mid-ocean ridge, 27.5°–32.3°S on the East Pacific Rise. We compared the distribution and chemistry of hydrothermal plumes to geological indicators of long-term (spreading rate) and moderate-term (ridge inflation) variations in magmatic budget. In this large-offset, propagating rift setting, these geological indices span virtually the entire range found along fast spreading ridges worldwide. Hydrothermal plumes overlaid ∼60% of the length of superfast (>130 km/Myr) spreading axis surveyed and defined at least 14 separate vent fields. We observed no plumes over the …

Mosquito Population Dynamics During The Establishment Phase Of A Constructed Desert Wetland, April Newman

UNLV Theses, Dissertations, Professional Papers, and Capstones

The Nature Preserve at the Clark County Wetlands Park is a constructed wetland that has the potential to produce new mosquito habitat. This thesis evaluates the potential for the development of a mosquito problem at the newly constructed wetland system by assessing the population dynamics of mosquitoes within the Nature Preserve. Based on data collected from May 2001 through January 2002, I describe fluctuations in mosquito genus and relative abundance during the first summer through winter period of wetland development.

Seed Security For Food Security, Mutizwa Mkute, Doreen Mnyulwa, Sarah Kimakwa

Faculty Publications

'Farmers' dependence on agro-companies for agricultural inputs has been growing in east and southern Africa and beyond. At the same time, local and indigenous knowledge about seed selection, saving and multiplying has been lost.

This manual for development workers outlines traditional and current methods of saving seed. It begins with some basic ground rules for working with communities. The second section gives a comprehensive guide to different ways of propagating plants and saving seed from a full range of common crops and trees. Finally, the third part offers a brief outline of the background history and the current issues and …

Tryptophan Requirements And The Effects Of Supplemental Tryptophan On Growth Performance, Plasma Metabolites, And Meat Quality In Nursery, Growing, And Finishing Pigs, Amy Christina Guzik

LSU Doctoral Dissertations

This research was conducted to estimate the true digestible Trp (dTrp) requirements in nursery, growing, and late finishing pigs and the effects of supplemental Trp on physiology, behavior, and meat quality. Five experiments were conducted to estimate the dTrp requirement in nursery pigs. Using broken-line regression analysis, dTrp requirements were 0.21, 0.20, and 0.18% for Phase I (5.2 to 7.3 kg), II (6.3 to 10.2 kg), and III (10.3 to 15.7) nursery pigs. In addition, four experiments were conducted to estimate the dTrp requirements in growing and finishing pigs. Using broken-line regression analysis, the dTrp requirement of pigs weighing 30.9, …

Endocrine And Reproductive Responses To Implants Of Deslorein Acetate In Horses, Carrie Ann Johnson

LSU Doctoral Dissertations

Four experiments were performed to study the effects of the gonadotropin releasing hormone (GnRH) analog, deslorelin acetate (Ovuplant™), on endocrine and reproductive characteristics in mares. The first experiment tested whether anecdotal field reports of Ovuplant causing extended interovulatory intervals would be detectable under controlled, experimental conditions. The use of Ovuplant to hasten ovulation in 13 mares, compared to 12 controls, increased (P < 0.05) the interovulatory interval by 6.2 d and suppressed (P < 0.05) plasma concentrations of both luteinizing hormone (LH) and follicle stimulating hormone (FSH) for approximately 11 d. Two mares receiving Ovuplant did not return to estrus within 30 d. In the second experiment, 10 control mares and 10 mares induced to ovulate with Ovuplant were administered GnRH (50 μg) on d 1, 4, 7, and 10 after ovulation. Again, treated mares had a longer (4.4 d, P < 0.05) interovulatory interval and suppressed LH and FSH concentrations in daily plasma samples. The gonadotropin response to GnRH was lower (P < 0.05) in the deslorelin mares on d 1, 4, and 7, indicating a lack of pituitary responsiveness. In the third experiment, 9 stallions and 12 steroid-treated geldings were used to determine if males were potential models for studying the deslorelin-induced gonadotropin suppression. In both cases, treatment with Ovuplant caused an initial rise in both gonadotropins followed by suppression for about 14 d. In the last experiment, 21 mares were used to determine if multiple doses of deslorelin would cause complete ovarian shutdown. Mares received either sham injections, three Ovuplant implants on the first day, or one implant per day for 3 d (n = 7 per group). Treatment with multiple deslorelin implants increased (P < 0.05) the interovulatory interval by 14.8 d and suppressed LH and FSH concentrations for approximately 25 d, however no mares exhibited complete ovarian shutdown. In conclusion, deslorelin acetate implants in horses in the form of Ovuplant induce short-term increases in LH and FSH secretion followed by long-term suppression of these concentrations and an insensitivity of the pituitary to GnRH. In a small percentage of mares, long-term ovarian shutdown is a possibility.

Hypoxanthine Phosphoribosyl Transferase And Early Embryo Development, Michael Gerard Collins Ii

LSU Doctoral Dissertations

The objectives of the first experiment were to ascertain if there were any differences between two mouse areola and adipose tissue cell lines. These cell lines differed only in the presence or absence of the hypoxanthine phosphoribosyl transferase (HPRT) gene. It was found that the cell lines were similar for all parameters. The objectives of the second experiment were to determine if the HPRT gene had an effect on the development of preimplantation mouse embryo. To test this transgenic mouse lines were created. The embryo sex and genotype ratio, the embryo diameter, and the embryo developmental patterns, using a Collin-Ryan …

Factors Affecting The Selection Of Business Arrangements By Hog Producers In The United States, Christopher Gazzara Davis

LSU Doctoral Dissertations

The structure of the U.S. hog industry is changing rapidly. U.S. hog farms have become smaller in number, larger in size and more specialized. This study examines the factors that influence the hog producer's choice among business arrangements offered in the U.S. hog industry. A national survey was mailed to 4,986 hog producers to determine these factors. The survey consisted of questions covering topics such as: production characteristics, autonomy, transaction costs, risk, social relationships, and demographics. A response rate of 21% was received from the mailed surveys. Four alternative business arrangements were used: independent production, cooperative farming, flat-fee contract, and …