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University Of Wyoming Wool Laboratory, 1907-2012, David Kruger

David Delbert Kruger

The University of Wyoming Wool Laboratory operated on campus from 1907-2012, in which time the sheep and wool industry experienced great change. For over a century, the faculty of the Wool Lab carefully cataloged research associated with sheep and wool, accumulating a collection of over 1,000 individual titles, 10,000 bound journal articles, correspondence, equipment manuals, and data notebooks, and a set of 872 preserved wool samples dating from 1837. This collection, now housed at the Emmett D. Chisum Special Collections Library at the University of Wyoming, is thought to be one of the most unique and complete collections of sheep …

Assessing The Impact Of Supplements, Food Aversions, And Silica On Medusahead Use By Sheep, Tyler Hamilton

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Ranchers, farmers, land managers, and resource management agencies have been plagued with various types of invasive weeds for decades, ultimately affecting millions of acres of viable wildlife habitat, grazing, and recreational opportunities. Invasive weeds often have nutritional contexts that negatively affect animals in some way, increasing the incentive to avoid consuming it by various animal species and domestic livestock. With the current amount of land infested with this weed, and the limited knowledge of the reason for avoidance, the underlying causes of livestock avoidance require in-depth and fundamental understanding.

In my MS program, I sought to explore the relationship of …

Comparative Digestibility By Cattle Versus Sheep: Effect Of Forage Quality, S. A. Soto-Navarro, R. Lancaster, C. Sankey, B. M. Capitan, B. P. Holland, L. A. Balstad, C. R. Krehbiel

Department of Animal Science: Faculty Publications

The objective was to determine the effect of forage quality on apparent total tract digestibility and ruminal fermentation in cattle versus sheep. Five yearling English crossbred (Hereford × Angus) steers (440.4 ± 35.6 kg of initial BW) and 5 yearling whiteface (Rambouillet × Columbia × Debouillet) wethers (44.4 ± 4.6 kg of initial BW), each fitted with a ruminal cannula, were randomly assigned to 1 of 3 forage sources within ruminant specie, and the study was conducted over 3 periods. For forage source, both animal and period served as the blocking factor with all forage sources represented once within each …

Repeated Superovulation Treatments In Kivircik Ewes During Breeding And Nonbreeding Seasons, Burcu Üstüner, Seli̇m Alçay, Yavuz Nak, Zekari̇ya Nur, Deni̇z Nak, Bi̇lgi̇ner Tuna, Gözde Şi̇mşek, Hakan Sağirkaya

Turkish Journal of Veterinary & Animal Sciences

The present study compared superovulation and embryo recovery rates applied repeatedly during breeding and nonbreeding seasons in the same 20 Kivircik sheep. Trials 1 and 3 were performed during the breeding season and the trial 2 was performed in the nonbreeding season. We synchronized the sheep's estrus cycles and induced a superovulatory response with porcine follicle stimulating hormone (pFSH) injections. Natural mating took place 12 h after the last FSH injection. The embryos were collected by laparotomy 7 days after natural mating. There was no significant difference between the number of corpora lutea (CL) counted following the 1st (breeding) and …

The Influence Of Pomegranate-Peel Extracts On In Vitro Gas Production Kinetics Of Rumen Inoculum Of Sheep, Mohammad Javad Abarghuei, Yousef Rouzbehan, Abdel-Fattah Salem

Turkish Journal of Veterinary & Animal Sciences

Different levels of pomegranate peel extracted by either water (PEH) or solvent mixture (PEM) were evaluated for their effect on in vitro gas production and ruminal fermentation patterns. Two levels of PEH or PEM (15 and 30 mg total phenolics (TP)/g DM of basal diet) were compared to a control (0) level. Ruminal fermentation parameters such as 24-h partitioning factor (PF_{24}), gas yield (GY_{24}), in vitro organic matter disappearance (IVOMD), metabolizable energy (ME), and microbial protein (MP) were calculated. The addition of PEH or PEM had no effect (P > 0.05) on asymptotic gas production, apparent degraded substrate (ADS), IVOMD, ME, …

Polymorphism Of The Ovine Calpastatin Gene In Some Turkish Sheep Breeds, Onur Yilmaz, Tamer Sezenler, Nezi̇h Ata, Yalçin Yaman, İbrahi̇m Cemal, Orhan Karaca

Turkish Journal of Veterinary & Animal Sciences

The calpastatin (CAST) gene has a major effect on muscle growth and meat tenderness after slaughter; it is located on the fifth chromosome in sheep. Blood samples were collected from 720 animals in total from Kıvırcık (KIV), Sakız (SZ), Karacabey Merino (KM), and Gökçeada (GA) sheep populations raised in West Anatolia. The PCR products were digested by the restriction endonuclease MspI. Allele frequencies for M and N alleles of the gene were found to be 0.85 and 0.15 in KIV, 0.80 and 0.20 in KM, 0.99 and 0.01 in GA, and 0.34 and 0.66 in SZ sheep, respectively. It was …

The Relationship Between Seropositivity And Tissue Cysts In Sheep Naturally Infected With Toxoplasma Gondii, Kader Yildiz, Oğuz Kul, Sami̇ Gökpinar, Hasan Tarik Atmaca, Yilmaz Emre Gençay, Aycan Nuri̇ye Gazyağci, Cahi̇t Babür, İsmayi̇l Safa Gürcan

Turkish Journal of Veterinary & Animal Sciences

Skeletal muscles (tongue, masseter, leg, intercostal, and diaphragmatic muscles) and brain samples of 100 sheep at slaughter were analysed for the presence of T. gondii tissue cysts along with serum IgG titres. Two methods of isolation by percoll gradient centrifugation and tissue microarray (TMA) technique with immunoperoxidase staining were used. Seropositivity was detected in 88% (88/100) of sheep sera analysed by indirect fluorescent antibody test. Tissue cysts were observed in 46 (52.3%, 46/88) and 15 (17%, 15/88) of the seropositive sheep with the isolation technique and TMA and immunoperoxidase staining, respectively. The diameters of the tissue cysts were 25–58 × …

The Effects Of Supplementing Diets Fed To Pregnant And Lactating Ewes With Saccharomyces Cerevisiae Dried Yeast, Katarzyna Zabek, Stanislaw Milewski, Roman Wójcik, Andrzej Krzysztof Siwicki

Turkish Journal of Veterinary & Animal Sciences

The objective of this study was to determine the effect of supplementing diets fed to ewes (in late pregnancy and during lactation or only during lactation) with Saccharomyces cerevisiae dried brewer’s yeast on the yield and chemical composition of milk and on selected parameters of humoral and cellular immunity. The investigated indicators were analyzed on days 28 and 70 of lactation. The addition of dried yeast contributed to a significant increase in milk yield, and the obtained milk was characterized by a lower somatic cell count, suggesting improved mammary gland health. Diet supplementation had a beneficial influence on the health …

Evaluation Of Ultrasonography As A Diagnostic Tool For Hepatic Hydatid Cysts In Sheep, Hussein Awad Hussein, Mohammed Elrashidy

Turkish Journal of Veterinary & Animal Sciences

This retrospective study was designed to evaluate the use of ultrasonography for the diagnosis of hepatic hydatid cysts. This study was conducted on 22 sheep, which were classified into 2 groups according to their liver health group (healthy liver = 13 and cystic liver = 9). Biochemically, serum concentrations of gamma-glutamyl transferase, aspartate aminotransferase, total bilirubin, and globulins were significantly increased (P < 0.01) while albumin was lowered (P < 0.01) in sheep with cystic livers. Ultrasonographically, rounded, anechoic, and unilocular hydatid cysts with elliptical circumferences ranging from 6 to 10 cm were seen. The interiors of cysts contained echogenic particulate materials, septations, or fine echoes. At the 10th intercostal space (ICS), ventral margin, size, thickness, and angle of livers increased in sheep with hepatic cysts, while the diameter of portal vein decreased in sheep with liver cysts. At the 9th ICS, the circumference of the gall bladder was lowered in sheep with hepatic cysts (P < 0.01). The sensitivity, specificity, and positive and negative predictive values of ultrasonography for diagnosis of hepatic hydatid cysts were 80%, 100%, and 100% and 83%, respectively. In conclusion, ultrasonography alone or in combination with some biochemical parameters reflecting liver function could be helpful for the diagnosis of hepatic hydatid cysts in sheep.

New Understanding Of An Old Phenomenon: Uncontrolled Factors And Misconceptions That Cast A Shadow Over Studies Of The ‘Male Effect’ On Reproduction In Small Ruminants, Trina Jorre De St Jorre, Penny Alison Rhian Hawken, Graeme Bruce Martin

Turkish Journal of Veterinary & Animal Sciences

In female sheep and goats, exposure to males can be used to induce ovulation and thus control and synchronise fertility. This 'male effect' offers simple, cost-effective, and hormone-free management of reproduction in flocks and herds but, despite decades of research, significant gaps in our knowledge impede commercial application. Many of these gaps can be traced back to misconceptions in the early documentation of the male effect, and others are the result of uncontrolled factors in experimental design. Consequently, it is often difficult to draw conclusions from past research, to further our understanding of the phenomenon, and to make recommendations for …