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Energy in poultry diets
While protein, vitamins and minerals are referred to as nutrients, energy -the 4th and most costly part of the diet- is not a nutrient but the property of energy yielding nutrients. Dietary nutrients that yield energy are protein, fat and carbohydrates. Dietary energy level is the main factor influencing feed intake, as birds will, under normal circumstances, eat to satisfy their energy needs. Therefore the dietary nutrients, protein vitamins and minerals should vary in relation to the dietary energy content of the diet, if they are not to become deficient, with low feed intakes, or overconsumed, with low energy diets. While there are a number of factors, such as level of protein, balance of essential amino acids and perhaps level of some of the other dietary nutrients, that can influence the cost of a diet, the level of dietary energy is usually the main factor influencing diet cost.
Nutrients in most feed ingredients are present in a complex matrix. Therefore, it is anticipated that feed enzymes like protease can exert a wide influence on nutrient digestibility beyond their targeted substrates (Cowieson and Bedford, 2009). For instance, the disruption of protein matrix surrounding starch granules due to protease supplementation had been shown to improve energy digestibility in some cereal grains (McAllister et al., 1993). It is hypothesised that protease may benefit...
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Introduction Soybean meal (SBM) is the most important and preferred source of quality protein in animal feeds (Banaszkiewicz, 2011). Among the oil seeds, SBM contains the highest crude protein (CP) and has the best AA profile, with only 6% crude fibre (Dei, 2011). The AAs in SBM are highly digestible by poultry (Newkirk, 2010). Based on the CP content, SBM can generally be classified as high protein (47% - 50%), or low protein (44% - 46%). Popescu & Criste (2003) suggested...
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DL-Methionine and L-Methionine are Equally Efficient in Broilers
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Non-starch polysaccharides (NSP) have a considerable impact on digestibility in broilers, dictating nutrient availability and energy utilization. The high NSP content of the hulls in canola meal are one factor limiting its effective use in poultry diets. The major NSP present in canola meal include cellulose, pectic polysaccharides and a variety of non-cellulosic polysaccharides, including arabinoxylans (AX). Attempts have been made to increase utilization of canola meal through the use of...
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INTRODUCTION Due to the price volatility of conventional feed ingredients, there is an ever-growing need to include relatively inexpensive alternatives such as fats in the diets. Such an approach might relatively reduce feed costs and simultaneously increase the energy density of the diets to meet the requirements of the modern fast-growing broilers. Fats are known to be a concentrated energy source, with at least twice as much energy as carbohydrates and proteins [1]. Alongside...
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Fiodor Marchenkov (Kronos Agro LLC, Kiev, Ukraine) offers his views on fat digestion and energy in animal diets....
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Martina Kluenemann, Research Manager for Nutrition Immunology and Physiology at Evonik Animal Nutrition, speaks about the mode of action of creatine as a constituent of energy metabolism and the benefits of GuanAMINO® supplementation in animals...
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INTRODUCTION In the United States and most parts the world, the biggest portion of poultry diets is comprised of carbohydrates, with corn being the main cereal grain used in the feed industry (Moran, 1982; Ai and Jane, 2016; Agristats, 2018; IGC, 2018). Corn is dried on the field or usually dried either by constant flow or batch drying after harvesting, so it could be included in poultry feeds. It has been reported that temperatures while drying could reach more than 100C mainly...
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Introduction Soyabean meal is the most important source of dietary protein for poultry in South Africa and much of the world. The increased use of vegetable protein meals in animal feeds has been brought about through consumer pressure for more sustainable and welfare oriented animal protein production. The increased use of vegetable protein sources has highlighted the importance of protein quality and the methods used to control quality have increased proportionately....
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Hello, In our operation, mostly broilers, we currently use AME or a form of AMEn to formulate diets. We track energy values based on NRC 1994, CVB tables, and Brazilian Tables using their equations on the ingredients for all diets. I have read some about NE and it seems there is a disagreement amongst industry if NE is advantageous in broilers. So our aim is to try and get NE values for our ingredients and track it's Energy Value in the diets along with the previously mentioned ones and see...
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Field pea ( Pisum sativum ) is a good source of protein but can also provide energy due to high starch content (Petterson et al., 1997). The slowly digestible starch in pea may improve energy utilization in broilers because of the prolonged elevated plasma glucose levels (Enting et al., 2005). Thus, partial replacement of soybean meal and wheat with pea may affect the net energy value of the diet. This experiment was performed to investigate the effect of pea in diet formulation on...
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INTRODUCTION Cereal grains such as wheat, sorghum, barley, and corn are commonly used in poultry diets as major sources of energy. Knowledge of the ME content of cereal grains is critical for their efficient and sustainable use and precise poultry feed formulation. Despite several limitations (Mateos et al., 2019; Wu et al., 2020), the AME is the globally accepted system for describing the available energy for poultry (Hill and Anderson, 1958; Sibbald, 1982). The simplicity,...
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Dr. Nelson Ruiz shares with Engormix members his research on this quantitative approach to improve feed formulation, presented at the International Poultry Scientific Forum at IPPE 2022 in Atlanta.
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Dr. Nelson Ruiz shares his advice with Engormix members regarding these two different ingredients....
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1. Introduction The conversion of dietary protein and amino acids into the protein of chicken-meat is indeed a dynamic process. Quite typically, broiler chickens attain a live weight of 2.918 kg at 42 days post-hatch and a carcass weight of 2.151 kg following processing. This translates to 376 g of carcass protein as a Ross 308 broiler carcass contains 175 g/kg protein [1]. Broiler chickens consume 4.702 kg of feed over 42 days with dietary protein contents declining from 230 to...
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1. Introduction Available energy in feed or feed ingredients for poultry can be measured by different systems, with the apparent metabolizable energy (AME) [1], despite its limitations [2,3], being the commonly accepted and extensively used system. Three methods, namely, direct, substitution (or difference), and regression, have been used to determine the AME of ingredients for poultry. In each method, the excreta can be collected by total collection, which is the...
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1. Introduction Often a seemingly straightforward aspect of nutrition reveals itself to be, upon closer inspection, not so simple after all. An illustration of such a conundrum is the nutrition of the newly hatched broiler chick. Conceptualizing the different challenges faced by the hatchling and solving them should be remarkably simple, but the difficulty lies in the complexity in the development of the gastrointestinal tract (GIT), digestive physiology, immune system, and...
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Introductions: Non-starch polysaccharides (NSPs) encapsulated in feed grains' cell walls contain valuable nutrients that may be wasted since some animals' endogenous enzymes cannot digest them. Xylanase feed additives degrade grain cell walls, releasing entrapped nutrients to the animal. The soluble portion of NSPs increase digesta viscosity, slowing the passage of feed through the digestive system and preventing an animal's natural enzymes from acting upon...
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1. Introduction Effective functionality and health of the gastrointestinal tract (GIT) are important factors in determining animal performance [1]. These aspects are particularly relevant in poultry farming, where animals capable of growing rapidly within a short period of time are needed. Three components of gut health have previously been suggested: diet, mucosa (which is, in turn, characterized by the digestive epithelium, the gut-associated lymphoid tissue and the...
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DL-Methionine and L-Methionine are Equally Efficient in Broilers
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INTRODUCTION The poultry gastrointestinal tract (GIT) is home to a complex, dynamic, and variable bacterial-dominated microbiota (Zhu et al., 2002). This GIT microbiome variation may be explained by different host characteristics and environmental factors (Kers et al., 2018), including birds age (Ballou et al., 2016; Pedroso et al., 2016), sex (Torok et al., 2013; Zhao et al., 2013), type and breed (Videnska et al., 2014; Kim et al., 2015), and GIT regions (Yeoman et al., 2012)....
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