A5087812453- Ruminant Nutrition and Digestive Physiology
- Genetic and phenotypic traits in livestock
- Animal Nutrition and Physiology
- Reproductive Physiology in Livestock
- Effects of Environmental Stressors on Livestock
- Agriculture Sustainability and Environmental Impact
- Soil and Water Nutrient Dynamics
- Muscle metabolism and nutrition
- Meat and Animal Product Quality
- Animal Behavior and Welfare Studies
- Aquaculture Nutrition and Growth
- Genetics and Plant Breeding
- Odor and Emission Control Technologies
- Milk Quality and Mastitis in Dairy Cows
- Livestock and Poultry Management
- Rabbits: Nutrition, Reproduction, Health
- Metabolism and Genetic Disorders
- Diet and metabolism studies
- Spectroscopy and Chemometric Analyses
- Turfgrass Adaptation and Management
- Crop Yield and Soil Fertility
- Protein Hydrolysis and Bioactive Peptides
- Phosphorus and nutrient management
- Fish Ecology and Management Studies
- Agronomic Practices and Intercropping Systems
University of Guelph
2016-2025
Naturalis Biodiversity Center
2024
Leiden University
2024
Salisbury University
2018
Virginia Tech
2006-2018
Worcestershire Acute Hospitals NHS Trust
2016
Massey University
2013
University of Reading
1998-2009
University of Manitoba
2009
Royal United Hospital
2008
Equations to describe gas production profiles, obtained using manual or automated systems for in vitro fermentation of ruminant feeds, were derived from first principles by considering a simple three-pool scheme. The pools represented the potentially degradable and undegradable feed fractions, accumulated gases. equations investigated mathematically generalized Mitscherlich, Michaelis-Menten, Gompertz, logistic. They allowing fractional rate degradation vary with time. permit extent ruminal...
The study set out to examine the effects of supplementing grass silage with various levels protein concentration and degradability on dietary nitrogen (N) excretion in lactating dairy cows consuming at least 60% forage. Six Holstein/Friesian early midlactation were offered six diets comprising two crude (210 290 g/kg DM) three concentrate achieved using different amounts untreated or formaldehyde-treated soybean meal. Despite a difference almost 100 g/d N intake, apparent fecal milk outputs...
Dietary intervention to reduce methane emissions from lactating dairy cattle is both environmentally and nutritionally desirable due the importance of as a causative agent in global warming significant loss feed energy. Reliable prediction systems for production over range dietary inputs could be used develop novel regimes limitation energy methane. This investigation builds on previous attempts at modeling methanogenesis involves development dynamic mechanistic model wholerumen function....
SUMMARY Methane, in addition to being a significant source of energy loss the animal that can range from 0·02 0·12 gross intake, is one major greenhouse gases targeted for reduction by Kyoto protocol. Thus, focuses recent research science has been develop or improve existing methane prediction models order increase overall understanding system and evaluate mitigation strategies reduction. Several dynamic mechanistic rumen function have developed which contain hydrogen gas balance sub-models...
The functional form W = (W0Kc + Wf t(c)) /(Kc t(c)), where is body size at age t, W0 and are the zero- infinite-time values of W, respectively, K c constants, derived. This new generalized Michaelis-Menten-type equation provides a flexible model for animal growth capable describing sigmoidal diminishing returns behavior. parameters nonlinear open to biological interpretation can be used calculate reliable estimates traits, such as maximum or average postnatal rates. To evaluate model,...
Previous attempts to apply statistical models, which correlate nutrient intake with methane production, have been of limited value where predictions are obtained for intakes and diet types outside those used in model construction. Dynamic mechanistic models proved more suitable extrapolation, but they remain computationally expensive not applied easily practical situations. The first objective this research focused on employing conventional techniques generate production appropriate United...
1. A multicornpartmental model, which assumes first-order kinetics, is proposed to describe digesta flow along the gastrointestinal tract of ruminants. 2. Solution model yields a multiplicative equation, containing single-exponential term and double-exponential term, for describing faecal outflow rate. 3. The logarithmic transformation equation was fitted eighty-two excretion curves obtained after administration marker into rumen cattle sheep, compared with other published models. 4. It...
Subacute ruminal acidosis (SARA) is characterized by pH depression and microbial perturbation. The impact of SARA adaptation recovery on rumen bacterial density diversity was investigated following high-grain feeding. Four ruminally cannulated dairy cows were fed a hay diet, transitioned to 65% grain diet for 3 weeks, returned the weeks. Rumen fluid, solids, feces sampled during weeks 0 (hay), 1 (high grain), 4 6 (hay). diagnosed week 1, with below 5.6 4.6±1.4 h. Bacterial significantly...
Summary A mechanistic model of dairy cow metabolism is described. The was constructed as part a programme directed toward quantitative and dynamic analysis concepts data regarding factors which influence the partition nutrients in lactating cows. Sensitivity behavioural analyses undertaken using indicate that arising from tissue level experiments conducted vitro can be used to structure parameterize whole-animal models since behaviour such acceptable. These further evaluate patterns nutrient...
Mathematical models in fish nutrition have proven indispensable estimating growth and feed requirements. Nowadays, reducing the environmental footprint improving product quality of culture operations are increasing interest. This review starts by examining simple applied to describe/predict profiles progresses towards more comprehensive concepts based on bioenergetics nutrient metabolism. Simple often lack biological interpretation overlook fundamental properties (e.g. ectothermy,...
The objective of this study was to develop a framework describing the milk production curve in sows as affected by parity, method yield (MY) determination, litter size (LS), and gain (LG). A database containing data on LS, LG, dietary protein fat content, MY, composition measured more than 1 d during lactation for determining MY from peer reviewed publications individual sow 3 studies constructed. Bayesian hierarchical model developed analyze data. classical Wood used time trends lactation,...