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Full-Text Articles in Life Sciences
Methane Prediction By Nutrient Profiles In Ruminal Continuous Cultures Fed An All Forage Diet Of Bermudagrass Or Annual Ryegrass, Kaylin Young
All Theses
Extensive research has been done on the effect of diet on rumen methane (CH4) production, and on developing equations to accurately predict CH4 in cattle. However, the majority of this research has been gathered from feedlot cattle or cattle fed a total mixed ration (TMR). To date, no studies have examined nutrient correlations with CH4 when feeding an all pasture diet of warm season or cool season grasses. This study included two in vitro experiments, one with a warm season forage and one with a cool season forage to see which nutrient characteristics of each forage best correlated with CH4 …
The Effects Of Altering Incubation Temperature On Broiler Chick Hatchability, Chick Quality, Sex Ratio, And Subsequent Performance Under Field Conditions, Abubaker Elmehdawi
The Effects Of Altering Incubation Temperature On Broiler Chick Hatchability, Chick Quality, Sex Ratio, And Subsequent Performance Under Field Conditions, Abubaker Elmehdawi
All Dissertations
The aim of this dissertation was to investigate the effects of manipulating the incubation temperature during late broiler embryogenesis on hatchability, chick quality, secondary sex ratio, and grow out performance under field conditions. Four experiments were conducted at a commercial hatchery and two setters of 42,240 eggs each were used; one served as control and the other as test with the same physical environment as the control except that thermal stimulation of 0.5o C and 1o C above the optimal incubation temperature were used, in the first two experiments and last two experiments respectively, for 2 h/d from 18 to …
Genetic And Environmental Determinants In The Evolution Of Alternative Mating Strategies In The Sailfin Molly, Poecilia Latipinna (Poeciliidae: Poecilia: Mollienesia), Elizabeth Lange
All Theses
Understanding the genetic and environmental factors responsible for differences in size, morphology and behavior can aid in determining how alternative male mating strategies evolve in natural populations. One important environmental factor is nutrition, as it underlies growth of both body size and morphological traits that are linked to alternative mating strategies in many animals. In sailfin mollies, Poecilia latipinna , male size is fixed at maturity, highly variable within populations and correlated with dorsal fin morphology and expression of alternative male mating behaviors. Large males with exaggerated dorsal fins use courtship behavior while small males with reduced dorsal fins use …
Individual Behavioral Variation Of Juvenile Spiny Lobster (Panulirus Argus) Denning Behaviors And The Role It Plays In Shelter Competition During Habitat Loss, Katherine Heldt
All Theses
Variation in juvenile spiny lobster (Panulirus argus) aggressive and gregarious behaviors may play an important role in structuring population level interactions. Since aggressive and gregarious behaviors were not repeatable and were found to be highly correlated with size, these behaviors were found to be largely driven by a combination of behavioral plasticity and ontogeny. Although larger individuals were found to be the most aggressive and least gregarious individuals, often occupying crevice shelters by themselves, they did not exclude smaller, less aggressive lobsters from crevice shelters. Surprisingly, in shelter limited situations, small, less aggressive individuals were more likely to use dens …
Effect Of Forage Type And Corn Supplementation On Animal Performance And Meat Quality, Asher Wright
Effect Of Forage Type And Corn Supplementation On Animal Performance And Meat Quality, Asher Wright
All Theses
Angus x Hereford steers (441 ± 24 kg; n = 32) were used in a 2-yr study (2011 and 2012) to examine forage type (legume species, alfalfa and soybeans LG vs. grass species, tall fescue and sudangrass, GR) and daily corn supplementation (0%, NS, vs. 0.75% BW, CS) on animal performance and carcass quality. Steers grazed (May-August) for a total of 98 d and 105 d in 2011 and 2012 respectively. Upon completion of the finishing period, steers were slaughtered and carcass data were collected. Steaks (2.5 cm thick) from the longissimus dorsi muscle (LM) were collected for measurement of …