Responses of different strains of Australian broiler chickens to feed restriction at an early age

1992 ◽  
Vol 43 (6) ◽  
pp. 1253 ◽  
Author(s):  
I Plavnik ◽  
D Balnave
Keyword(s):  
Broiler Chickens ◽  
Abdominal Fat ◽  
Feed Restriction ◽  
Meat Production ◽  
Early Age ◽  
Breast Meat ◽  
Broiler Meat ◽  
Commercial Broiler ◽  
Different Strains ◽  
Ad Libitum Feeding

Male chickens from the three most common commercial broiler strains in Australia were fed conventionally or on a regimen which restricted growth by approximately 58% between 6 and 12 days of age followed by ad libitum feeding. Early age feed restriction had no significant effect on bodyweight at 47 days of age, and feed was utilized significantly more efficiently with all three strains. Restriction significantly reduced abdominal fat and had no significant effect on the yield of breast meat. The large improvements in feed efficiency and reductions in abdominal fat have major implications with regard to the economics of broiler meat production.

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

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.

Effect Of L-Thyroxin Hormone (T4) On Compensatory Growth In Broiler Chicks

2002 ◽  
Vol 2002 ◽  
pp. 84-84
Author(s):  
A. Hassanabadi ◽  
A. golian
Keyword(s):  
Feed Efficiency ◽  
Broiler Chickens ◽  
Compensatory Growth ◽  
Specific Dynamic Action ◽  
Abdominal Fat ◽  
Feed Restriction ◽  
Broiler Chicks ◽  
Fat Pad ◽  
Heat Increment ◽  
Maintenance Requirements

Purpose of researches in feed restriction area is improvement of feed efficiency, decrease of carcass fat content and abdominal fat pad size (Plavnik and Hurvitz,1991).Birds after early life feed restriction have less maintenance requirements due to decrease of heat increment and decrease of basal metabolic rate and specific dynamic action of food (Forsum et al.,1981).In many investigations, compensatory growth have not observed (Summers et al.,1990).It seems administration of Thyroid hormone after feed restriction can induce compensatory growth. The objective of the present study was to investigate the effect of early feed restriction and L-Thyroxin administration after early feed restriction on compensatory growth in broiler chickens.

Enrichment with long chain omega-3 fatty acids and sensory evaluation of chicken meat

2009 ◽  
Vol 2009 ◽  
pp. 230-230
Author(s):  
S A Mirghelenj ◽  
A Golian ◽  
V Taghizadeh
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Broiler Chickens ◽  
Normal Growth ◽  
Omega 3 ◽  
Breast Meat ◽  
Broiler Meat ◽  
Dietary Fish ◽  
Artery Disease ◽  
Long Chain

N-3 fatty acids are essential for normal growth and development, and may play an important role in prevention of coronary artery disease, hypertension, diabetes, arthritis, other inflammatory and autoimmune disorders and cancer in humans (Simopoulos, 1999). Fatty acid profiles of broiler meat may be modified by adding fish oils to the diet (Lopez-Ferrer et al., 2001). When meat is enriched with PUFA, particularly n-3 long-chain fatty acids (C≥20), all sources of added vegetable oils seem to be less effective than marine oils (Bou. R et al., 2004). The purpose of this experiment was to study the effect of dietary fish oil on fatty acid composition of thigh and breast meat in broiler chickens.

scholarly journals Effect of dietary selenium on lipid oxidation, selenium and vitamin E content in the meat of broiler chickens

2008 ◽  
Vol 53 (No. 7) ◽  
pp. 306-311 ◽  
Author(s):  
M. Skřivan ◽  
G. Dlouhá ◽  
O. Mašata ◽  
S. Ševčíková
Keyword(s):  
Vitamin E ◽  
Broiler Chickens ◽  
Sodium Selenite ◽  
Basal Diet ◽  
Tocopherol Content ◽  
Dietary Sodium ◽  
Breast Meat ◽  
Tocopherol Concentration ◽  
Broiler Meat ◽  
Dietary Treatments

An experiment was conducted to compare the effect of dietary sodium selenite and selenomethionine on selenium and α-tocopherol concentration in breast meat, oxidative stability of meat in broilers, and on growth performance, but only as an unimportant criterion in this case. Sexed broiler cockerels Ross 308 were allocated to 3 dietary treatments, each comprising 100 chickens. The basal diet was supplemented with 0 (control) or 0.3 mg/kg Se from sodium selenite (SS) or selenomethionine (SM). Dietary supplementation with SM increased (<I>P</I> < 0.05) body weight, but only by about 3%. Breast muscle Se concentration was increased (<I>P</I> < 0.05) by both Se sources, but more by SM (1.32 mg/kg dry matter; 0.47 mg/kg DM in control). The concentration of Se in excreta was 3 times higher with SS supplement than with SM supplement. Dietary Se supplementation increased (<I>P</I> < 0.05) the α-tocopherol content of breast meat from 25.9 mg/kg DM in the control to 33.2 mg/kg DM when SM supplementation was used. Furthermore, lipid peroxidation decreased compared to the control. The inclusion of SM in the diet reduced (<I>P</I> < 0.05) malondialdehyde (MDA) values in breast samples after 0, 3, and 5 days of cooler storage, whereas SS decreased (<I>P</I> < 0.05) the MDA of breast meat after 0 and 3 days of storage. The results of this experiment indicate that selenomethionine in the diet of broilers is capable of simultaneously increasing the content of selenium and vitamin E in broiler meat plus its stability in storage.

scholarly journals RNA-Seq Analysis of Abdominal Fat Reveals Differences between Modern Commercial Broiler Chickens with High and Low Feed Efficiencies

PLoS ONE ◽  
2015 ◽  
Vol 10 (8) ◽  
pp. e0135810 ◽  
Author(s):  
Zhu Zhuo ◽  
Susan J. Lamont ◽  
William R. Lee ◽  
Behnam Abasht
Keyword(s):  
Broiler Chickens ◽  
Abdominal Fat ◽  
Rna Seq ◽  
Commercial Broiler

Dietary supplements of methionine increase breast meat yield and decrease abdominal fat in growing broiler chickens

1999 ◽  
Vol 39 (2) ◽  
pp. 131 ◽  
Author(s):  
I. R. Wallis
Keyword(s):  
Amino Acid ◽  
Food Intake ◽  
Broiler Chickens ◽  
Abdominal Fat ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Food Conversion ◽  
Feed Conversion ◽  
Fat Pad ◽  
Breast Meat

The response of male broiler chickens to graded amounts of an essential amino acid (methionine) or an amino acid analogue (methionine hydroxy analogue free acid, MHA-FA) was examined in this experiment. The effects of each supplement on food intake, food conversion and the masses of a demand tissue (breast meat) and an indicator of body fat (abdominal fat pad) were measured. Birds grew significantly faster, ate more and had a lower food conversion ratio when there was more DL-methionine or MHA-FA in the diet. After standardising the differences in food intake between treatments, there were still highly significant differences in liveweight between diets. After removing the variation due to treatment differences in body mass, the data showed that adding either DL-methionine or MHA-FA to the diet increased the mass of breast meat and reduced the size of the abdominal fat pad. Exponential equations fitted to the body mass and feed conversion ratio data indicate that, in an equimolar comparison, MHA-FA is 78 and 70% as potent as DL-methionine for growth and feed conversion ratio respectively. Similar equations fitted to the carcass data show that MHA-FA is only 71% as potent as DL-methionine in depositing breast tissue. Increasing amounts of DL-methionine reduced the variability in liveweight and carcass, breast and abdominal fat pad weights. Adding 0.05% MHA-FA reduced variability in these traits compared with the basal ration but higher amounts of MHA-FA had no additional effect.

scholarly journals The effect of genotype and age on the carcass quality of broilers and males of the laying hybrids

2008 ◽  
Vol 56 (4) ◽  
pp. 121-126
Author(s):  
Martina Lichovníková ◽  
Alžbeta Jarošová
Keyword(s):  
Total Body Weight ◽  
Abdominal Fat ◽  
Carcass Weight ◽  
Meat Production ◽  
Carcass Quality ◽  
Breast Meat ◽  
Leg Muscles ◽  
Total Body ◽  
Breast Weight

In the study the carcass quality of fast growing broilers (F) and slow growing layer males (S) was compared. The effect of age on the carcass quality of S (S1, S2) was also evaluated. The weights of the carcasses were as follows: F 1110 g, S at 90 days of age 1116 g (S1) and S at the age of 132 days 1878 g (S2). Despite similar carcass weight in F and S1, the weight of the breast, and it’s proportion to the total body weight was significantly higher (P < 0.001) in F (265 g and 23.9% vs. S1 174 g and 15.6%). Continued fattening of the layer males resulted in increased breast weight (S2 276 g, P < 0.001) but not in breast proportion (S2 14.7%).The weight of the legs was significantly higher (P < 0.001) in S1 in comparison with F, but it was due to the heavier weight of the leg bones in S1 (P < 0.001). There was no difference neither in the weight of the leg muscles, nor of the leg proportions between F and S1. The proportion of the leg muscles increased significantly (P < 0.05) in S2 (25.6%) in comparison with S1 (24.1%). The content of abdominal fat, fat in the breast and fat in the leg muscles was significantly lower (P < 0.01, P < 0.01, P < 0.05, respectively) in the layer males S1 in comparison with the F broilers. The proportion of abdominal fat was 1.79% in F, and 0.54% in S1. The content of the breast fat was 1.24% in F and 0.56% in S1. The proportion of fat in the leg muscles was 8.45% in F and 2.78% in S1. As the birds became older, the content of the fat increased: the abdominal fat in S2 – 1.38% (P < 0.01), the breast fat in S2 – 0.96% (P < 0.01) and the leg muscles fat in S2 – 3.94% (P < 0.05). There was significantly lower (P < 0.001) content of dry matter in S1 than in F both in the breast and in the leg muscles.At the same carcass weight as the broilers, the layer males had a lower proportion of breast meat and also a lower content of abdominal fat, fat in the breast and fat in the leg muscles. The proportion of the leg muscles was comparable between the two groups. Concerning meat production, the quality of the carcasses of the layer males improved with age. Comparing the F carcasses with weight at 1110 g with the S2 carcass with weight of 1878 g, the weigh of the breast was almost the same, the weight of the leg muscles was higher in S2, and mainly the content of the fat in leg muscles was lower. The content of the abdominal fat and the breast fat was similar in both groups.

scholarly journals Effect of genotype and sex on carcass characteristics of chickens raised in extensive system

2018 ◽  
Vol 34 (4) ◽  
pp. 405-417
Author(s):  
Lidija Peric ◽  
Vladimir Strugar ◽  
Snezana Bogosavljevic-Boskovic ◽  
Mirjana Djukic-Stojcic
Keyword(s):  
Carcass Characteristics ◽  
Abdominal Fat ◽  
Conversion Ratio ◽  
Meat Production ◽  
Production Traits ◽  
Feed Conversion ◽  
Breast Meat ◽  
Body Weights ◽  
Percentage Yield ◽  
Dressing Percentage

The aim of this work was to examine the possibility of using different poultry breeds for meat production in extensive systems, concerning their slaughter traits. Total of 200 birds of two genotypes were used in this trial: fast-growing hybrid Ross 308 and pure breed White Rock. Chicks were raised indoors until the age of 4 weeks and subsequently they were enabled to access the range. The trial lasted for 13 weeks. At the end of the trial, 10 male and 10 female chicks per breed were sacrificed for the evaluation of slaughter traits - dressing percentage, yield and share of carcass parts. It was established that both genotype and sex significantly affected carcass traits while genotype affected production traits. Chickens of the Ross 308 hybrid had higher body weights, better feed conversion ratio and higher mortality rate. Chickens of the Ross 308 hybrid had dressing percentage compared to the White Rock breed, while the male chickens had higher dressing percentage compared to the female ones. Chickens of the Ross 308 hybrid had a significantly larger weight and share of breast meat, whereas those of the White Rock breed had a larger share of drumsticks and thighs. A significant influence of the genotype was determined on the amount of abdominal fat in the carcass. Chickens of the White Rock breed had a significantly lower fat content compared to the Ross 308 hybrid, which essentially makes them the genotype which is more suitable for the extensive fattening longer than 10 weeks.

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