The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
A F Mustafa - One of the best experts on this subject based on the ideXlab platform.
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effects of hay inclusion on intake in vivo Nutrient Utilization and ruminal fermentation of goats fed spineless cactus opuntia ficus indica mill based diets
Animal Feed Science and Technology, 2008Co-Authors: E L Vieira, ângela Maria Vieira Batista, Adriana Guim, Francisco Fernando Ramos De Carvalho, A C Nascimento, R F S Araujo, A F MustafaAbstract:Abstract A study was conducted to determine the minimum level of tifton bermudagrass hay (TH) required to maximize cactus intake by buck goats without compromising Nutrient Utilization or ruminal fermentation. Five ruminally fistulated goats were used in a 5 × 5 Latin square experiment with 17-day periods. Experimental diets contained (g/kg dry matter (DM) basis) 765, 670, 572, 473 and 373 spineless cactus and 50, 150 250, 350, and 450 TH, respectively. Intake of DM increased quadratically (P 3 –N concentration, and rumen content of DM and aNDF. Inclusion of TH in cactus based diets improved feed intake without adversely affecting in vivo Nutrient Utilization or ruminal fermentation and inclusion of 150 g/kg TH (DM basis) was sufficient to maximize cactus intake.
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effects of feeding micronized and extruded flaxseed on ruminal fermentation and Nutrient Utilization by dairy cows
Journal of Dairy Science, 2004Co-Authors: C Gonthier, A F Mustafa, R Berthiaume, H V Petit, R Martineau, D R OuelletAbstract:Abstract Four lactating Holstein cows with ruminal and duodenal cannulas were used in a 4 × 4 latin square design to determine the effects of feeding heat-treated flaxseed on ruminal fermentation and site and extent of Nutrient Utilization. Four diets were formulated: a control diet with no flaxseed, a raw flaxseed diet (RF), a micronized flaxseed diet (MF), and an extruded flaxseed diet (EF). Flaxseed diets contained 12.6% flaxseed (dry matter [DM] basis). Ruminal pH, NH 3 N, and total concentration of volatile fatty acids were not affected by dietary treatments. However, feeding flaxseed decreased the molar proportion of acetate and increased that of propionate. Flaxseed supplementation had no effect on ruminal digestion of DM, organic matter (OM), neutral detergent fiber (NDF), crude protein (CP), fatty acids (FA), and gross energy. However, ruminal digestion of acid detergent fiber (ADF) was lower for cows fed the flaxseed diets than for cows fed the control diet. Feeding flaxseed tended to increase post-ruminal and total tract digestibilities of DM, OM, NDF, and gross energy. Feeding heat-treated flaxseed diets relative to RF had no effect on ruminal, post-ruminal, and total tract Nutrient digestibilities. Cows fed EF had higher ruminal and lower post-ruminal digestibilities of DM, OM, ADF, CP, and FA than cows fed MF. However, total tract digestibilities were similar for the 2 heat treatments. It was concluded that flaxseed supplementation improved total tract Nutrient Utilization with no adverse effects on ruminal fermentation. Extrusion failed to protect flaxseed from ruminal digestion. However, micronization can be used to increase the ruminal undegraded protein value of flaxseed.
E.f. Vasechkina - One of the best experts on this subject based on the ideXlab platform.
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Nonlinear relationships between phytoplankton Nutrient Utilization traits and environmental factors
Ecological Modelling, 2020Co-Authors: E.f. VasechkinaAbstract:Abstract Relationships between the functional traits of phytoplankton and environmental factors remain insufficiently explored. However, these dependencies could be very useful for trait-based ecological modelling of phytoplankton communities. The purpose of this study is to estimate possible connections between Nutrient Utilization traits of marine phytoplankton, cell volume, temperature of the experiment, irradiance and taxonomic category of the species collected in Ecological Archives E096–202 ( Edwards et al., 2015 ). The search for patterns was made using the author's technique of polynomial multilayered neural network (NN) building. The optimal set of neurons' connections with the preceding layer of the network was obtained by means of a genetic algorithm run for each neuron. This approach gave good results given the sparse data sets and small samples. Categorical predictor “taxonomic group” was parameterized by an integer. We found approximations for maximal uptake and growth rates, half-saturation constants, maximum and minimum Nutrients quotas as nonlinear functions of cell volume, taxon number, temperature and irradiance. Mean-square errors were lower than the errors in respective relationships to the cell volume only. These functions were used to fill in the gaps in the ecological archive. Verification of the obtained relationships was performed using an energy balance model and new data on Nutrient Utilization traits not used for their estimation.
D R Ouellet - One of the best experts on this subject based on the ideXlab platform.
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effects of feeding micronized and extruded flaxseed on ruminal fermentation and Nutrient Utilization by dairy cows
Journal of Dairy Science, 2004Co-Authors: C Gonthier, A F Mustafa, R Berthiaume, H V Petit, R Martineau, D R OuelletAbstract:Abstract Four lactating Holstein cows with ruminal and duodenal cannulas were used in a 4 × 4 latin square design to determine the effects of feeding heat-treated flaxseed on ruminal fermentation and site and extent of Nutrient Utilization. Four diets were formulated: a control diet with no flaxseed, a raw flaxseed diet (RF), a micronized flaxseed diet (MF), and an extruded flaxseed diet (EF). Flaxseed diets contained 12.6% flaxseed (dry matter [DM] basis). Ruminal pH, NH 3 N, and total concentration of volatile fatty acids were not affected by dietary treatments. However, feeding flaxseed decreased the molar proportion of acetate and increased that of propionate. Flaxseed supplementation had no effect on ruminal digestion of DM, organic matter (OM), neutral detergent fiber (NDF), crude protein (CP), fatty acids (FA), and gross energy. However, ruminal digestion of acid detergent fiber (ADF) was lower for cows fed the flaxseed diets than for cows fed the control diet. Feeding flaxseed tended to increase post-ruminal and total tract digestibilities of DM, OM, NDF, and gross energy. Feeding heat-treated flaxseed diets relative to RF had no effect on ruminal, post-ruminal, and total tract Nutrient digestibilities. Cows fed EF had higher ruminal and lower post-ruminal digestibilities of DM, OM, ADF, CP, and FA than cows fed MF. However, total tract digestibilities were similar for the 2 heat treatments. It was concluded that flaxseed supplementation improved total tract Nutrient Utilization with no adverse effects on ruminal fermentation. Extrusion failed to protect flaxseed from ruminal digestion. However, micronization can be used to increase the ruminal undegraded protein value of flaxseed.
K.r. Helyar - One of the best experts on this subject based on the ideXlab platform.
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Efficiency of Nutrient Utilization and sustaining soil fertility with particular reference to phosphorus
Field Crops Research, 1998Co-Authors: K.r. HelyarAbstract:Abstract Investment in fertilizer must be profitable for soil fertility to be sustainable for commercial agriculture, otherwise only an exploitative system can be operated. Three methods of increasing the marginal return from fertilizer application to the marginal cost ratio to above one are considered: increasing the product price and/or decreasing the fertilizer cost; improving the efficiency of Nutrient Utilization through improved extension; and improving the efficiency of Nutrient Utilization by developing new cultivars and management techniques. Phosphorus (P) is used as an example and most emphasis is placed on the third method. Maximising the efficiency of P Utilization is equated with minimizing the P fertilizer rate required to maintain the economically optimum P fertility status of a system. Ultimate efficiency is achieved in a system where the maintenance P fertilizer rate is equal to P removal in product. Losses of P in run-off, eroded material and leachate are usually minimal in well-managed systems so the main means of increasing efficiency are to minimize the accumulation of P in the soil as organic and inorganic P. Accumulation of inorganic soil P is minimized by maximising plant demand and minimizing soil reactions (removing yield limitations due to factors other than P deficiency, placing P fertilizer in zones with active root growth, avoid fertilizing in excess of plant requirements). Establishing crop rotations that maintain soil organic matter will limit loss of applied P into the organic pool. Opportunities for increased efficiency of P Utilization through cultivar improvement include selection for traits that favor strong plant demand such as late maturity, increased longevity of rootlet activity, and increased P solubilization capacity. It is suggested that increased root surface area per unit of P required may be a useful index to indicate cultural conditions and varietal characteristics that favor strong plant demand on soil P and thus minimize soil losses.
ângela Maria Vieira Batista - One of the best experts on this subject based on the ideXlab platform.
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effects of hay inclusion on intake in vivo Nutrient Utilization and ruminal fermentation of goats fed spineless cactus opuntia ficus indica mill based diets
Animal Feed Science and Technology, 2008Co-Authors: E L Vieira, ângela Maria Vieira Batista, Adriana Guim, Francisco Fernando Ramos De Carvalho, A C Nascimento, R F S Araujo, A F MustafaAbstract:Abstract A study was conducted to determine the minimum level of tifton bermudagrass hay (TH) required to maximize cactus intake by buck goats without compromising Nutrient Utilization or ruminal fermentation. Five ruminally fistulated goats were used in a 5 × 5 Latin square experiment with 17-day periods. Experimental diets contained (g/kg dry matter (DM) basis) 765, 670, 572, 473 and 373 spineless cactus and 50, 150 250, 350, and 450 TH, respectively. Intake of DM increased quadratically (P 3 –N concentration, and rumen content of DM and aNDF. Inclusion of TH in cactus based diets improved feed intake without adversely affecting in vivo Nutrient Utilization or ruminal fermentation and inclusion of 150 g/kg TH (DM basis) was sufficient to maximize cactus intake.
