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Now showing items 161-180 of 182
The role of the mammary gland during heat stress
(University of Missouri--Columbia, 2019)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Disruptive effects of climate change, such as increasing environmental temperature, have direct impacts on economic viability and efficiency of food ...
Novel alkaloid management strategies for improved beef cattle production in the fescue belt
(University of Missouri--Columbia, 2019)
Tall fescue (Schedonorus arundinaceus) is an important forage crop for agriculture in Missouri and much of the eastern United States. Tall fescue is known for hardiness and herbage accumulation, much of which is attributed ...
Evaluating pig performance, carcass merit and processed pork quality when chestnuts and acorns are fed to Duroc-influenced pig genetics during late finishing
(University of Missouri--Columbia, 2019)
The objective of this study was to determine effects of feeding chestnuts and acorns on growth performance, carcass quality and further processed products of Duroc/Duroc crossbred finishing barrows. Barrows (n = 30) were ...
Genetics in practice : applications of quantitative genetics to environment and educational pursuits
(University of Missouri--Columbia, 2018)
"The ability to elucidate quantitative trait architecture and introduce potentially beneficial traits makes introgression a useful tool. Unfortunately, due to the nature of inheritance there are certainly limitations to ...
Mitigation of summertime boar infertility by evaporative and conductive cooling
(University of Missouri--Columbia, 2018)
Boars subjected to summertime temperatures results in reductions in sperm quality. This reduction in quality is associated with decreases in both litter size and conception rate. With this study we aim to quantify the ...
Methods to improve growth efficiency in beef cattle
(University of Missouri--Columbia, 2015)
Genetics, nutrition and animal management each have integral roles in maximizing growth efficiency of domestic livestock. Residual feed intake (RFI) is an accurate method of distinguishing between feed efficient and ...
Ablation of conceptus PTGS2 provides a new understanding of early pregnancy events in the pig
(University of Missouri--Columbia, 2019)
Pig conceptuses produce and secrete estrogens (E[2]), interleukin 1 beta 2 (IL1B2), and prostaglandins (PGs) during the period of rapid trophoblast elongation and establishment of pregnancy. Previous studies established ...
Effects of the bovine slick mutation on heat stress responses and hair growth in mice
(University of Missouri--Columbia, 2020)
The bovine slick mutations result from more than one allele variant causing a slick hair phenotype and improved thermotolerance to elevated ambient temperatures in cattle. These mutations result in the truncation of the ...
Digestible amino acid requirements for young female turkeys
(University of Missouri--Columbia, 2018)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] Nine experiments were conducted to determine the optimal digestible isoleucine (dIle), valine (dVal), leucine (dLeu), phenylalanine plus tyrosine (dPT) ...
Investigation of mechanisms associated with establishment and maintenance of pregnancy in beef cattle
(University of Missouri--Columbia, 2020)
Preovulatory estradiol concentrations and expression of estrus have been shown to be associated with greater pregnancy rates in beef cattle. Experiment 1 was designed to determine if supplemental estradiol (E2) at GnRH-induced ...
Comprehensive approach to dietary inclusion of high oleic soybean oil in monogastrics
(University of Missouri--Columbia, 2020)
The banning of partially hydrogenated oils in food processing by the FDA has led to a search for alternative oil sources with a decreased potential for oxidation. While marketed and founded for use in the food industry, ...
Taxonomic and metagenomic approaches to diet, health, and breeds of ruminants
(University of Missouri--Columbia, 2020)
Ruminant mammals maintain a symbiotic relationship with their gut microbiome, the organisms of which break complex plant matter into metabolites that are absorbed by the host animal for its nutrition. Building on prior ...
New perspective on the role of conceptus estrogens in conceptus development, maternal recognition, and the establishment of pregnancy in pigs.
(University of Missouri--Columbia, 2018)
The proposed signal for maternal recognition of pregnancy in pigs is estrogen, produced by the elongating conceptus. To understand the role of estrogen in porcine conceptus elongation and pregnancy establishment, a loss ...
Growth, performance and quality attributes of steers supplemented with high oleic soybean oil
(University of Missouri--Columbia, 2019)
Growing concerns with saturated fatty acids on human health has led to research being done to reduce saturated fatty acid levels in animal tissues. The objective of this study was to evaluate the effect of high oleic soybean ...
Improved cloning efficiency by chemically induced metabolic reprogramming of donor cells used for porcine somatic cell nuclear transfer
(University of Missouri--Columbia, 2019)
The use of somatic cell nuclear transfer (SCNT) to create agricultural and biomedical models is extremely useful for understanding how we can improve the efficiency of production agriculture, as well as how we can better ...
Effect of preovulatory estradiol and(or) postovulatory progesterone on the establishment of pregnancy in beef cattle
(University of Missouri--Columbia, 2018)
Preovulatory secretion of estradiol and postovulatory secretion of progesterone are essential for preparing the uterine environment for pregnancy in cattle. In a previous study, circulating concentrations of preovulatory ...
Evaluating progestin-based protocols to control estrous cycles of beef heifers prior to timed artificial insemination
(University of Missouri--Columbia, 2018)
The recent development of split-time artificial insemination as a breeding strategy improved reproductive outcomes following treatment with the 14d CIDR[copyright]-PG protocol; however, STAI has not been evaluated with ...
Investigation of methods and factors influencing mouse oocyte quality, in vitro fertilization and embryo development
(University of Missouri--Columbia, 2018)
Mice are one of the most commonly used rodent species as a model for biomedical research to better understand molecular, genetic, and cellular causes of human disease and disorders. The production of good quality oocytes ...
Estimates of correlation between estrus behavior and estradiol concentrations during estrus
(University of Missouri--Columbia, 2020)
Estrus traits have economic value in dairy production systems and can potentially be incorporated into genomic selection. Three studies were performed to further understand selection responses. Study one and two explored ...
Genetic and nutritional effects on reproduction in lactating dairy cows
(University of Missouri--Columbia, 2020)
Good reproductive performance is a prerequisite for profitable pasture-based seasonal calving systems of milk production. The objective of this dissertation was to elucidate the physiological mechanisms contributing to ...