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Search Results: 1 - 10 of 769 matches for " Layers Hens "
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Modelo Matemático para Comparar Curvas de Produ??o de Ovos
Fialho, FB;Ledur, MC;Avila, VS;
Revista Brasileira de Ciência Avícola , 2001, DOI: 10.1590/S1516-635X2001000300002
Abstract: a segmented polynomial model was used on several egg production curves in an attempt to analyze the differences between the curves in a more descriptive manner. production curves from different commercial and experimental genetic lines of layers were used. the parameters of the model include the age and level of peak production, rate of decrease in production after the peak and time between start and peak of production. these and other derived variables were compared between the curves using contrasts. the methodology used allowed an easier interpretation of the curves, and the detection of differences in sexual maturity, uniformity and peak of production. this work validates the segmented polynomial model for use in future research dealing with analysis of egg production curves.
Mathematical Model to Compare Egg Production C
Fialho FB,Ledur MC,Avila VS
Revista Brasileira de Ciência Avícola , 2001,
Abstract: A segmented polynomial model was used on several egg production curves in an attempt to analyze the differences between the curves in a more descriptive manner. Production curves from different commercial and experimental genetic lines of layers were used. The parameters of the model include the age and level of peak production, rate of decrease in production after the peak and time between start and peak of production. These and other derived variables were compared between the curves using contrasts. The methodology used allowed an easier interpretation of the curves, and the detection of differences in sexual maturity, uniformity and peak of production. This work validates the segmented polynomial model for use in future research dealing with analysis of egg production curves.
Effects of Mango Wastes-Based Diets on the Growing Parameters of Laying Hens and Biometric Parameters of the Eggs  [PDF]
Drissa Barry, Timbilfou Kiendrebeogo, Modou Sere, Alima Combari, Youssouf Mopaté Logténé, Chantal Yvette Kaboré-Zoungrana
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1105868
Abstract:
Introduction: Poultry production has increased during the past half century throughout the world. In Burkina Faso modern poultry farming is becoming a necessity in view of the growing demand for eggs. Intensive poultry farming is developing rapidly, given that the productivity of local poultry remains very low Because of the low availability and high cost of food. Therefore, it becomes imperative to develop strategies to make modern poultry farming more productive, by finding alternative solutions for feeds. Objective: The study aims to evaluate the effects of diets incorporating mango waste-based feed on the growth parameters of laying hens and biometric parameters of first eggs. Methods: Two hundred and ten (10) hens of the Isa Brown breed were divided into 3 batches (70 chicks per set) and feed with three diets namely mango and maize diet (MMD = lot1), control maize diet (CMD = lot2) and absolute control diet (ACD = lot3) in a feed experiment at INERA research station in Farako-ba, Bobo Dioulasso. Results: The final average weight (FW) gained by the lot1 and lot3 using the diet CMD (1364 ± 114 g) and ACD (1364 ± 115 g), respectively was significantly higher than the lot 2 feed with the MMD diet (1265 ± 117 g) (p < 0.05). The average daily weight gain (ADG) of CMD and ACD was significantly (p < 0.05) higher than that of the MMD ration. The feed intake (FI) and consumption index (CI) of the MMD ration were significantly (p < 0.05) higher than those of CMD and ACD (p > 0.05). Average weight and egg density were similar (p > 0.05) for the three diets. The eggs on the MMD diet were larger (p < 0.05) than those in the ration’s CMD and ACD, but the two later were similar (p > 0.05). Conclusion: Maize can be substituted with mango feed in growing layer diets. Mango waste-based feed is predisposed for better preparation of growing layers for good laying performances. It is an alternative to increase the availability of feed for farm animals including the laying hen.
PRUEBA DE SENSIBILIDAD ANTIMICROBIANA DE CEPAS DE Salmonella GRUPO D (MóVILES E INMóVILES) AISLADAS DE PONEDORAS COMERCIALES EN COLOMBIA
Mantilla,J; Pulido,M; Jaime,J;
Revista de la Facultad de Medicina Veterinaria y de Zootecnia , 2010,
Abstract: infections caused by salmonella bacteria are a major cause of economic losses in the poultry industry, because caused mainly by the presentation of diarrheas and septicemic birds leading to a marked decrease in the production death. in colombia due to the negative effect by salmonella spp. in poultry, and with the aim of controlling the disease, the people have been using a variety of antimicrobials, which do not possess sufficient information about its behavior in terms of sensitivity and resistance against strains of salmonella spp. field. the aim of this study was to determine the response of 20 strains of salmonella group d (mobile and non mobile) isolated from commercial laying hens in colombia against different antimicrobials. for the isolation and characterization are using conventional microbiological techniques, biochemical tests, serological testing and antibiotic susceptibility by agar diffusion. the results revealed a total resistance to streptomycin, followed by tetracycline and florfenicol and less resistance to products such as fosfomycin and chloramphenicol.
Structural-Energy Characteristics of Tribotechnical Contact in Unsteady Operational Modes  [PDF]
Tareq M. A. Al-Quraan, Oksana O. Mikosyanchik, Rudolph G. Mnatsakanov, Olexander I. Zаporozhets
Modern Mechanical Engineering (MME) , 2016, DOI: 10.4236/mme.2016.63010
Abstract: The current tribological research is intended to achieve maximum wear resistance under the structural adaptability of tribocoupling elements, which requires application of means to reduce the activation of the metal surface layers, decrease in frictional work, regulation of passivation and temperature control. The aim of this study is to identify the patterns that influence the kinetics formation of the boundary layers of lubricating mineral gear oil on activated friction contact surfaces, and the increment of the friction specific work on wear-resistant steel 42Cr4 and 100Cr6 in frequent start and stop operation mode. Due to the activation of surface layers of metal in the non-stationary operating conditions of the contact surfaces, the gradual forming of the boundary lubricant adsorption layers with increased effective viscosity in contact occurs, exhibiting high adaptation ability, and the boundary layer thickness is from 0.2 to 4 microns. This research analyzed the lubricating ability of oil at the starting maximum torque of friction, showing that the thickness of the oil layer formed in contact had a dual nature—boundary and hydrodynamic. The pure rolling conditions promote localization of shear in the lubricating layers, and the high frictional properties of the transmission oil have been identified regardless of the hardness of the investigated surfaces.
Palladium Ultra Thin Layer Profiles Evaluation by Evanescent Light  [PDF]
Nina Mirchin, Igor Lapsker, Ewdard Tannous, Aaron Peled
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.49070
Abstract:

Nanometric profiles of sputtered ultra-thin Pd layers with thicknesses in the range 1 - 10 nm were investigated by capturing the leaking evanescent light from optical waveguides. The Pd films were deposited by sputtering on glass substratesalso servingas light waveguides. Calibrating the thickness values for the ultra-thin Pd films obtained from the sputtering rate combined with the DELI estimation technique, gave detailed 1Dand 3D morphological nanometric profiles of the deposited layers.

Effect of Citric Acid, Phytase and Calcium Levels on the Calcium and Phosphorus Content in Egg: Yolk-Albumen and Shell, Yolk Color and Egg Quality in Diets of Laying Hens  [PDF]
Lily M. Vargas-Rodríguez, Jesús E. Morales-Barrera, José G. Herrera-Haro, Juan Antonio-Bautista, Roberto López-Pozos, David Hernández-Sánchez
Food and Nutrition Sciences (FNS) , 2016, DOI: 10.4236/fns.2016.714124
Abstract: To evaluate the effect of different levels of citric acid (CA) combined with phytase and calcium levels in the diets of laying hens on the calcium and phosphorus (P) contents of eggs: yolk-albumen and shell, yolk color and egg quality. A study was conducted with 24-week-old laying hens fed with a diet based on sorghum and soybean meal with 2.7 Mcal of EM/kg, 15% crude protein, 3.25% calcium and 0.25% available P. The levels of CA, phytase and calcium were 0%, 0.6% and 1.2%; 0 and 300 units of phytase (PHYU)/kg; and 3.0% and 3.25%, respectively. Phytase was added as an ingredient into to the diets, contributing 0.1% P and 0.3% calcium. A completely randomized factorial experiment was performed with a 3 × 2 × 2 design and 4 replications. The CA increased (P < 0.05) the P in the shell, and the combination of 1.2% CA, 300 PHYU phytase and 3.25% calcium increased (P < 0.05) the calcium in the eggshell. There was a CA × phytase × calcium interaction (P < 0.05) affecting egg yolk pigmentation; there were no differences in egg quality. It was concluded that adding CA to the diets of laying hens increases eggshell calcium content, and improves the phytase response. 1.2% CA × Phytase × 3.25% calcium significantly increases shell calcium by 0.56 g. Under the conditions of the present investigation, it would imply greater resistance of the eggs to be broken in the handling from the farm to the sales centers and consumer. Phytase interacts negatively with 0.6% CA at low calcium levels to degrade the yellow pigmentation of the yolk.
Asymptotic Expansion of Temperature Close to a Singularity of a Plate  [PDF]
Isabelle Titeux
World Journal of Mechanics (WJM) , 2011, DOI: 10.4236/wjm.2011.13015
Abstract: The thermal conduction in a thin laminated plate is considered here. The lateral surface of the plate is not regular. Consequently, the boundary of the middle plane admits a geometrical singularity. Close to the origin, the lateral edge forms an angle. We shall prove that the classical bidimensional problem associated with the thin plate problem is not valid. In this paper, using the boundary layer theory, we describe the local behavior of the plate, close to the perturbation.
Flow through a Variable Permeability Brinkman Porous Core  [PDF]
M. S. Abu Zaytoon, T. L. Alderson, M. H. Hamdan
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.44087
Abstract: In this work, we consider the flow through composite porous layers of variable permeability, with the middle layer representing a porous core bounded by two Darcy layers. Brinkman’s equation is valid in the middle layer and has been reduced to an Airy’s inhomogeneous differential equation. Solution is obtained in terms of Airy’s functions and the Nield-Kuznetsov function.
DIFERENCIAS BIOQUíMICAS Y FISIOLóGICAS EN EL METABOLISMO DE LIPOPROTEíNAS DE AVES COMERCIALES
Osorio,José Henry; Flórez,Jancy Darly;
Biosalud , 2011,
Abstract: the objectives of this work were to analyze the basic lipids metabolism in poultry and to identify the main differences between genetic lines and productive purposes: information from the last 50 years included in the bbcs-lilacs, fuente académica, ib-psycinfo, ib-ssci, ib-scielo, scopus and scirus, databases as well as historical articles, texts and references cited in research published to date were analyzed. important information related to the proposed objectives in the present review was found and analyzed, reason why it can be divided into five sections as follows: lipid digestion and absorption in poultry, exogenous lipids transport, endogenous lipids transport, differences on lipid metabolism in broilers and differences for lipid metabolism in laying hens. portomicrons in poultry are transported by portal vein instead of by lymphatic vessels as it happens with chylomicrons in mammals. in the lipoprotein metabolism, the serum lipids and the lipid accumulation levels are different between males and females and lineage or genetic line.
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