Components of feed efficiency in broiler breeding stock: The use of fasted body temperature as an indicator trait for feed conversion in broiler chickens

This study was designed to evaluate the effects of dietary supplemental DL-methionine (MET) on live performance and meat yield for broilers raised to a common weight. A total of 1552 one-day old Ross 708, sexed broilers were randomly distributed to 32 pens resulting in eight treatments (TRT) of four replicates with 44 male or 53 female/pen. A randomized complete block with a 2 × 4 (sex × 4 MET levels 0, 0.5, 1, and 2 g/kg) factorial arrangement of TRT was used. A common weight of 2400 g was approached by day 46 (1 and 2 g MET/kg feed) and day 48 (0 and 0.5 g MET/kg feed). Supplementation of MET at 1, and 2 g/kg had a lower (p < 0.01) feed conversion ratio (FCR) at day 46/48 than broilers fed 0.5 g MET/kg. Broilers without supplemental MET had the worst (p < 0.01) feed conversion and average daily gain (ADG) at day 46/48. Birds fed 0 g MET/kg of feed had lower (p < 0.05) whole eviscerated carcass without giblets (WOG), yield than birds fed 2 g MET/kg of feed. Additionally, birds fed 0 g MET/kg of feed had lower (p < 0.05) breast fillet and tender percent yields than birds fed supplemental MET. Elimination of MET from organic broiler diets resulted in reduced ADG, breast fillet yield and feed efficiency of meat yield of broilers raised to day 46/48. Reduction in MET supplementation below current levels reduced the efficiency of meat production of organic broilers raised to day 46/48.

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Components of feed efficiency in broiler breeding stock: is improved feed conversion associated with increased docility and lethargy in broilers?

Poultry Science ◽

10.1093/ps/82.4.532 ◽

2003 ◽

Vol 82 (4) ◽

pp. 532-537 ◽

Cited By ~ 15

Author(s):

DO Skinner-Noble ◽

RB Jones ◽

RG Teeter

Keyword(s):

Feed Efficiency ◽

Feed Conversion ◽

Breeding Stock

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META-ANALYSIS OF PHYTOGENIC ADDITIVES FOR BROILERS

Canadian Journal of Animal Science ◽

10.1139/cjas-2021-0058 ◽

2022 ◽

Author(s):

Gustavo do Valle Polycarpo ◽

Gabrieli Andressa de Lima ◽

Thaís de Souza Ávida ◽

Fábio Sampaio Rosas ◽

Valquiria Cação Cruz-Polycarpo ◽

...

Keyword(s):

Feed Efficiency ◽

Broiler Chickens ◽

Meta Analysis ◽

Average Daily Gain ◽

Feed Conversion ◽

Growth Promoting ◽

Meta Regression ◽

Number Of Publications ◽

Daily Gain ◽

Main Factor

Phytogenic additives have been studied intensively in broiler chickens’ production to substitute growth-promoting antibiotics. However, the comprehensive literature on this topic makes it difficult to understand overall results because there are a noticeable number of studies with conflicting conclusions. While several research studies have shown that phytogenic additives may increment broiler chicken’s performance, others make the opposite evident. This study aimed to organize and understand information through meta-analysis considering a great number of publications and the factors that may interfere in the results of phytogenic additives, evaluating whether phytogenic additives can be used as a performance-enhancing additive for broilers, comparing with the effectiveness of growth-promoting antibiotics. The main factor that interferes in the evaluation of phytogenic additives is the microbiological challenge. Phytogenic additives improved average daily gain (ADG) (P < 0.001) and feed conversion (P < 0.001) regardless of microbiological challenge; however, they were worse compared to antibiotics under higher challenge (P < 0.020). A meta-regression of ADG in function of average daily feed intake confirmed that phytogenic additives increased the feed efficiency of broilers, but with less effectiveness than antibiotics. The blends of phytogenic additives increased the ADG in relation to the isolated use of only one phytogenic additive.

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Whole-grain feeding for chicken-meat production: possible mechanisms driving enhanced energy utilisation and feed conversion

Animal Production Science ◽

10.1071/an13417 ◽

2015 ◽

Vol 55 (5) ◽

pp. 559 ◽

Cited By ~ 27

Author(s):

Sonia Yun Liu ◽

Ha H. Truong ◽

Peter H. Selle

Keyword(s):

Conversion Efficiency ◽

Feed Efficiency ◽

Broiler Chickens ◽

Chicken Meat ◽

Meat Production ◽

Whole Grain ◽

Feed Conversion ◽

Feed Conversion Efficiency ◽

Causative Factors ◽

Feed Costs

The practice of offering some whole grain to broiler chickens alongside a balancing concentrate is meeting increasing acceptance in certain regions, including Europe, Canada and Australia. Whole-grain feeding (WGF) regimes provide economic advantages by effectively reducing feed costs but, to varying extents, WGF regimes also generate improvements in energy utilisation and feed conversion efficiency. However, the context in which these improvements are best realised has yet to be defined adequately. The outstanding response to WGF is the development of heavier relative gizzard weights; however, the causative factors and biophysical and biochemical consequences of heavier, and presumably more functional, gizzards have not been properly investigated. It follows that heavier gizzards would enhance the initiation of protein digestion by pepsin and hydrochloric acid and facilitate amylase-induced starch digestion in the small intestine by the prior physical disruption of starch granules. However, it appears that improvements realised by WGF in energy utilisation and feed efficiency cannot be attributed entirely to heavier gizzards. One alternative or additional possibility is that WGF may influence starch digestive dynamics and provide more gradually or slowly digestible starch, which would benefit energy utilisation and feed efficiency. However, if this is the case, the genesis of this provision is not clear, although it may be associated with larger grain particle sizes and/or increased episodes of reverse peristalsis, but not retarded gut passage rates. The present paper reviews the essentially positive impacts of WGF on energy utilisation and feed conversion efficiency and considers the contexts in which these responses may be best realised and the possible mechanisms driving better performance under WGF regimes for chicken-meat production.

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Cafeteria-Type Feeding of Chickens Indicates a Preference for Insect (Tenebrio molitor) Larvae Meal

Animals ◽

10.3390/ani10040627 ◽

2020 ◽

Vol 10 (4) ◽

pp. 627 ◽

Cited By ~ 1

Author(s):

Marcos Antonio Nascimento Filho ◽

Raquel Tatiane Pereira ◽

Ana Beatriz Santos de Oliveira ◽

Diana Suckeveris ◽

Alvaro Mario Burin Junior ◽

...

Keyword(s):

Feed Intake ◽

Feed Efficiency ◽

Broiler Chickens ◽

Tenebrio Molitor ◽

Multidimensional Analysis ◽

Standard Diet ◽

Feed Conversion ◽

Mineral Supplement ◽

Treatment Groups ◽

Tenebrio Molitor Larvae

This study aimed to determine whether broiler chickens display a preference for Tenebrio molitor larvae (TM) meal by evaluating ingredient acceptability and birds’ performance. Sixty 14-day-old male chickens were assigned into two treatment groups (5 birds/pen, n = 6) in a cafeteria-type study: the control (C) group, and the TM group. Each pen was equipped with one bell drinker and four through feeders allocated side by side; all feeders of the C group contained a complete standard diet whereas each feeder of the TM group contained one of the following ingredients: ground corn, extruded semi-whole soybean, vitamin-mineral supplement mixture, and TM meal. Feed intake was recorded daily and growth was monitored periodically up to day 32. Chickens which had access to individual feed components showed a delay to display preference for TM, but consumed, overall, up to 50% of the total intake as TM meal. Feed intake and growth performance were lower in all periods for TM group (p < 0.02), whereas feed conversion ratio was improved on days 22–28 and days 29–32 of age (p < 0.01). Data from bivariate and multidimensional analysis indicate that birds started to reach a balance of ingredient intake at 25 days of age, showing a high correlation between consumption of each ingredient and the day of the experiment. Chickens exhibited a preference for T. molitor meal, resulting in improved feed efficiency, which allows us to conclude that it can be a suitable feed alternative for poultry.

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PENGARUH TINGKAT PEMBATASAN PEMBERIAN PAKAN (Restricted Feeding) TERHADAP PERFORMAN AYAM BROILER JANTAN

Sains Peternakan ◽

10.20961/sainspet.v14i1.8778 ◽

2017 ◽

Vol 14 (1) ◽

pp. 43

Author(s):

Hatifah Aprilia Kusuma ◽

Ashry Mukhtar ◽

Ratih Dewanti

Keyword(s):

Body Weight ◽

Feed Efficiency ◽

Broiler Chickens ◽

Body Weight Gain ◽

Feed Consumption ◽

Restricted Feeding ◽

Feed Conversion ◽

Feed Cost ◽

Randomized Design ◽

Body Weights

This study aims to determine the effect of restricted feeding rate on the broiler chickens performance. The research was carried out in Tompe, Jirapan Village, Masaran Sub District, Sragen Distric for six weeks beginning from September 14th until October 26th, 2011. This study used 100 male broiler chickens New Lohmann strain. The research design used Completely Randomized Design (CRD) one way trafic with four treatments. The fourth treatments are: P0 (full feeding without fasting), P1 (6 days full feeding and 1 day fasting), P2 (5 days full feeding and 1 day fasting) and P3 (4 days full feeding and 1 day fasting). Each treatment consisted of five replicates. Feed consisted of BR1 and BR2. The Parameters observedare Body Weights Gain, Feed Consumption, Feed Conversion,and Income Over Feed Cost. The results showed that the average of four treatment are P0, P1, P2 and P3 respectively for body weight gain are 81.37; 74.47; 72.65, and 72.50 grams / head / day, feed intake are 137.94; 126.46; 124.06; and 119.11 g / head / day, feed conversion are 1.70; 1.70; 1.71, and 1.64, feed efficiency are 0.59; 0, 59; 0.59, and 0,61. The average of Income Over Feed Cost are Rp. 8.757,26; Rp. 8.014,98;Rp. 7.818,14; and Rp. 7.808,57. The analysis of variance results for body weight gain and whole consumption has significant effect (P<0.01), conversionwas not affected. From these results it can be concluded that the rate of feeding restricteds is significantly affect on body weight gain and feed consumption of Broiler Males.

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Components of feed efficiency in broiler breeding stock: energetics, performance, carcass composition, metabolism, and body temperature

Poultry Science ◽

10.1093/ps/82.7.1080 ◽

2003 ◽

Vol 82 (7) ◽

pp. 1080-1090 ◽

Cited By ~ 15

Author(s):

DO Skinner-Noble ◽

RG Teeter

Keyword(s):

Body Temperature ◽

Feed Efficiency ◽

Carcass Composition ◽

Breeding Stock

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Influence of Lactobacillus casei WB 315 and crude fish oil (CFO) on growth performance, EPA, DHA, HDL, LDL, cholesterol of meat broiler chickens

Iranian Journal of Microbiology ◽

10.18502/ijm.v12i2.2620 ◽

2020 ◽

Author(s):

Andreas Berny Yulianto ◽

Widya Paramita Lokapirnasari ◽

Rifqi Najwan ◽

Hana Cipka Pramuda Wardhani ◽

Nabil Fariz Noor Rahman ◽

...

Keyword(s):

Fish Oil ◽

Growth Performance ◽

Feed Efficiency ◽

Lactobacillus Casei ◽

Broiler Chickens ◽

Basal Diet ◽

Conversion Ratio ◽

Feed Conversion Ratio ◽

Feed Consumption ◽

Feed Conversion

Background and Objectives: Use of antibiotics as growth promoters in animal feeds has been restricted due to the residues in poultry products such as egg and meat, furthermore to the antibiotic resistant of pathogenic bacteria. The prohibition of their use opens the opportunity for the use of non-antibiotic feed additives such as probiotics. The objectives of this study were to investigate the effect of the addition of Lactobacillus casei WB 315 and crude fish oil (CFO) to diets on growth performance, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), low density lipoproteins (LDL), high density lipoprotein (HDL), and cholesterol levesl of broiler chickens. Materials and Methods: In this research, one-day old male broiler chicks were used and divided equally into four groups, namely a basal diet without L. casei WB 315 and without CFO (P0), basal diet supplemented with 0.5% L. casei WB 315 of total broiler basal feed (1.2 × 109 cfu/ml) and without CFO (P1), basal diet supplemented without L. casei WB 315 and 1% CFO of total broiler basal feed (P2), and basal diet supplemented with 0.5% L. casei WB 315 of total broiler basal feed (1.2 × 109 cfu/ml) and 1% CFO of total broiler basal feed (P3) for 35 days. Results: The results of addition 0.5% Lactobacillus casei WB 315 (1.2 × 109 cfu/ml) and 1% CFO of total broiler basal feed after 35 days showed significant difference among treatment in feed efficiency (p<0.05), feed conversion ratio (p<0.05), feed consumption (p<0.05), EPA (p<0.05), DHA (p<0.05), increase HDL (p<0.05), reduced the LDL (p<0.05), and reduce cholesterol (p<0.05) in meat broiler chicken. Conclusion: It is concluded that the addition of L. casei WB 315 and crude fish oil (CFO) could significant improve the growth performance (feed efficiency, feed conversion ratio, feed consumption) and could significantly improve EPA, DHA and increase HDL and decrease LDL in meat poultry product.

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Effects of feeding Isomaltooligosaccharides on the growth performance, carcass traits and immune response of broiler chickens

JOURNAL OF ADVANCES IN AGRICULTURE ◽

10.24297/jaa.v3i2.4256 ◽

2014 ◽

Vol 3 (1) ◽

pp. 150-157

Author(s):

Khalid M. Gaafar

Keyword(s):

Immune Response ◽

Growth Performance ◽

Broiler Chickens ◽

Carcass Traits ◽

Dietary Supplementation ◽

Control Group ◽

Broiler Chicks ◽

Feed Conversion ◽

Flu Vaccine ◽

Lipids Profile

The research was conducted to study the effect of feeding broiler chickens on diets containing isomaltooligosaccharides on the growth performance, carcass traits and immune response. 90-one day old broiler chicks were used according to completely randomized two treatment groups and one control, 30 birds each. Birds fed ad-libitum on basal starter and grower-finisher diets for 35 day. Diets of treatment`s groups contained 0.5 g/Kg and 1 g/Kg of Isomaltooligosaccharides, while the control group fed on the basal diets without Isomaltooligosaccharides supplementation. Dietary supplementation of broiler chickens with Isomaltooligosaccharides improved body weight, feed conversion, carcass traits, two lymphoid organs weight and log antibody titer against avian flu vaccine. Most of the highest values were for birds fed low levels of Isomaltooligosaccharides. Feed intake decreases as Isomaltooligosaccharides level increases. Dietary supplementation with Isomaltooligosaccharides did not affect the lipids profile (triglycerides, total cholesterol, LDL and HDL), however the blood VLDL levels decreased with increased levels of Malondialdehyde and Glutathione reductase. Collectively, Dietary supplementation of broiler chickens with 0.5 g/Kg diet of Isomaltooligosaccharides improved growth performance, carcass traits and immune status.

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The use of acidifying agents Aquasafe and Veleguard when rearing of broiler chickens

Kormlenie sel'skohozjajstvennyh zhivotnyh i kormoproizvodstvo (Feeding of agricultural animals and feed production) ◽

10.33920/sel-05-2002-02 ◽

2020 ◽

pp. 16-27

Author(s):

L. Gamko ◽

T. Tarinskaya

Keyword(s):

Drinking Water ◽

Organic Acids ◽

Broiler Chickens ◽

Positive Impact ◽

The Body ◽

Metabolic Energy ◽

Control Group ◽

Meat Production ◽

Feed Conversion ◽

Broiler Meat

It is known that necessary to replace the components of organic acids, which are part of acidifiers when drinking water to poultry in order to prevent the adaptation of microbes in the gastrointestinal tract. In the poultry industry organic acids are widely used, which are used as acidifiers to preserve the properties of water consumed. The purpose of this work was to evaluate the efficiency of broiler meat production when using acidifying agents of drinking water Aquasafe and Veleguard. The experimental part of the work has been performed in JSC “Kurinoe Tsarstvo-Bryansk” broiler area “Roshcha” in the Pochepsky district. The object of research was the livestock of broiler chickens cross Cobb 500 at floor housing. The effect of water acidifiers on meat productivity has been studied. Groups of chickens have been formed on the principle of pairs-analogues. Broiler chickens of experimental groups have been separated from the main livestock by a grid in the corner of the room for 100 heads in each group. It has been found by a result of research to be optimal dose usage of acidifying agents water Aquasafe and Veleguard to drink to broiler chickens. The positive effect of these acidifiers on the digestion of crude protein, crude fat, crude fiber, contributing to the effective use of nitrogen, which led to an increase in the intensity of growth, young animals’ livability and improved feed conversion. Slaughter yield in the control group was 55,1 %, and in the experimental group 57,2 and 58,4 %, which was by 2,1 and 3,3 % higher with the same level of metabolic energy and nutrients. In chickens that consumed acidifi ers more intensively used nutrients feed for deposition in the body of the components of the carcass, which affected the production. A positive impact of acidifying agents Aquasafe and Veleguard on meat quality in broiler chickens has been found.

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