scholarly journals Response to selection for feed conversion ratio in Japanese quail

2010 ◽  
Vol 89 (8) ◽  
pp. 1590-1598 ◽  
Author(s):  
S. Varkoohi ◽  
M. Moradi Shahr Babak ◽  
A. Pakdel ◽  
A. Nejati Javaremi ◽  
M. Zaghari ◽  
...  
Keyword(s):  
Japanese Quail ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Response To Selection ◽  
Feed Conversion ◽  
Selection For

scholarly journals Erratum to “Response to selection for feed conversion ratio in Japanese quail” (Poult. Sci. 89:1590–1598)

2011 ◽  
Vol 90 (1) ◽  
pp. 295 ◽  
Author(s):  
S. Varkoohi ◽  
M. Moradi Shahr Babak ◽  
A. Pakdel ◽  
A. Nejati Javaremi ◽  
M. Zaghari ◽  
...  
Keyword(s):  
Japanese Quail ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Response To Selection ◽  
Feed Conversion ◽  
Selection For

scholarly journals Results of selection for breast muscle percentage and feed conversion ratio in Pekin ducks

2011 ◽  
Vol 27 (3) ◽  
pp. 769-776 ◽  
Author(s):  
H. Pingel
Keyword(s):  
Feed Efficiency ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Breast Muscle ◽  
Feed Consumption ◽  
Direct Selection ◽  
Meat Production ◽  
Feed Conversion ◽  
Nitrogen And Phosphorus ◽  
Selection For

Increasing breast muscle percentage by selection for breast layer thickness (muscle and skin) of living ducks by needle probe improves carcass quality as could be demonstrated by experiments and by applied breeding programs. In addition direct selection for individual feed conversion ratio can increase the efficiency of duck meat production. Divergent selection for feed conversion ratio from the age of 4 - 7 weeks over 11 generations has differentiated the feed efficiency by about 25 %. Causes for the reduction in feed conversion ratio are lower fat content of carcass, lower locomotor activity, higher enzymatic activity (alkaline phosphatase and creatinkinase in blood plasma) and better feed protein utilization. Because of lower feed consumption in the line selected for lower feed conversion ratio the emission of nitrogen and phosphorus via manure was reduced by about 39 and 26 %, respectively. That means, selection for better feed efficiency is not only an important economical but also an important ecological factor.

Reducing the cost of beef production through the genetic improvement of net feed efficiency

1998 ◽  
Vol 1998 ◽  
pp. 45-45
Author(s):  
R.M. Herd ◽  
J.A. Archer ◽  
P.F. Arthur ◽  
E.C. Richardson
Keyword(s):  
Feed Efficiency ◽  
Genetic Improvement ◽  
Production Systems ◽  
Growth Efficiency ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Feed Conversion ◽  
Selection For ◽  
The Cost ◽  
Animal Production Systems

Feed is the single largest cost in most animal production systems. Feed conversion ratio (FCR) is a commonly used measure of growth efficiency. Previous research has shown that FCR is moderately heritable and highly related to growth rate. While selection for FCR is beneficial to those feeding growing cattle for slaughter, any associated increase in the size of breeding females will mean this benefit will be at a cost to the calf breeder, as larger breeding cows require more feed.

Reducing the cost of beef production through the genetic improvement of net feed efficiency

1998 ◽  
Vol 1998 ◽  
pp. 45-45
Author(s):  
R.M. Herd ◽  
J.A. Archer ◽  
P.F. Arthur ◽  
E.C. Richardson
Keyword(s):  
Feed Efficiency ◽  
Genetic Improvement ◽  
Production Systems ◽  
Growth Efficiency ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Feed Conversion ◽  
Selection For ◽  
The Cost ◽  
Animal Production Systems

Feed is the single largest cost in most animal production systems. Feed conversion ratio (FCR) is a commonly used measure of growth efficiency. Previous research has shown that FCR is moderately heritable and highly related to growth rate. While selection for FCR is beneficial to those feeding growing cattle for slaughter, any associated increase in the size of breeding females will mean this benefit will be at a cost to the calf breeder, as larger breeding cows require more feed.

scholarly journals Enzyme Treatment Improves The Utilization Of Lupin-Based Diets By Japanese Quail (Coturnix Japonica)

2019 ◽  
Vol 4 (1) ◽  
pp. 1-8
Author(s):  
Mahmoud Khalil ◽  
Irek A. Malecki ◽  
Mahmoud El-Attrouny ◽  
Graeme B. Martin
Keyword(s):  
Japanese Quail ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Metabolizable Energy ◽  
Enzyme Treatment ◽  
Feed Conversion ◽  
Negative Effects ◽  
Dry Matter Digestibility ◽  
Apparent Metabolizable Energy ◽  
Poultry Feeding

In poultry, feeding diets including high concentrations of non-starch polysaccharides limits growth rate and feed conversion ratio, and causes problems in health and welfare because of the production of wet droppings. This problem is becoming more important as pressure builds to reduce costs by using alternative sources of dietary protein, such as lupin grain, rather than fish- or soybean-meal. We therefore tested whether enzymes that break down non-starch polysaccharides can overcome the problems with a lupin-based diet fed to Japanese quail. Chicks (18 days old) were allocated among 8 treatments, each replicated 3 times, with 12 chicks per replicate (ie, 36 birds per treatment). Chicks were fed diets formulated to contain 24% crude protein and 12 MJ/kg apparent metabolisable energy (AME). The diets included 10% or 20% lupin meal and, for each level of lupin, they were formulated in one of four ways: 1) no enzyme; 2) pectinase (1.4 U/g polygalacturonase and 0.2 U/g pectinesterase); 3) xylanase (1,4 endo-xylanase; 0.38 U/g); 4) combination of the above pectinase and xylanase treatments. The results indicated that, from age 28 days of age, both lupin content and enzyme treatment significantly (P < 0.05) affected chick performance. Compared with the no-enzyme control, enzyme treatments improved growth at 35 days by 45-50% (P < 0.05) and feed conversion ratio by 20-30% (P < 0.05) for both levels of lupin content. In addition, dry matter digestibility and apparent metabolizable energy were significantly improved by the combined enzyme treatment for both levels of lupin inclusion. We conclude that pectinase and xylanase can overcome the negative effects of the non-starch polysaccharides in lupin meal, improving the growth of quail chicks fed lupin-based diets, and that the enzymes work best when combined.

Response to selection and genotype–environment interaction in mink (Neovison vison) selected on ad libitum and restricted feeding

2011 ◽  
Vol 91 (2) ◽  
pp. 231-237 ◽  
Author(s):  
Vivi Hunnicke Nielsen ◽  
Steen Henrik Møller ◽  
Bente Krogh Hansen ◽  
Peer Berg
Keyword(s):  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Breeding Value ◽  
Environment Interaction ◽  
Restricted Feeding ◽  
Response To Selection ◽  
Feed Conversion ◽  
Genotype Environment Interaction ◽  
Ad Libitum ◽  
Ad Libitum Feeding

Nielsen, V. H., Møller, S. H., Hansen, B. K. and Berg, P. 2011. Response to selection and genotype-environment interaction in mink (Neovison vison) selected on ad libitum and restricted feeding. Can. J. Anim. Sci. 91: 231–237. Mink were selected for high November weight (AL line) and low feed conversion ratio (FC line) on ad libitum feeding and for high November weight on restricted feeding (RF line). After three generations of selection, the average estimated breeding value for November weight was 533, 326, and 150 g in males and 168, 82, and −85 g in females in the AL, RF, and FC lines. The breeding value for feed conversion ratio was −1.39, −0.84 and −0.68 kg feed kg−1 gain in males and −0.39, −0.31 and −0.23 kg feed kg−1 gain in females in the selection lines. In generation 4, the AL, RF and FC lines were tested on both ad libitum and restricted feeding. The estimated breeding value for November weight in males in the AL line (533 g) was significantly greater than that in the RF line (384 g) on ad libitum feeding. The corresponding values on restricted feeding were 297 and 326 g, respectively, which were not significantly different. This indicates genotype×environment interaction. In the AL line, selection improved feed conversion ratio by increased appetite. In the RF line, it was improved by increased feed utilization. Environmental sensitivity in males, estimated from breeding values for November weight was 236 g in the AL line and 58 g in the RF line suggesting that the RF line was more robust to changes in feeding conditions. A smaller litter size in the AL line (4.1) than in the RF line (5.6) indicates that selection for large weight affects reproduction.

scholarly journals Utilization of guava extract as additive antioxidant in diets of Japanese quail breeders (Coturnix japonica)

2020 ◽  
Vol 21 ◽  
Author(s):  
Hyara Paula Fleuri XAVIER ◽  
Nadja Susana Mogyca LEANDRO ◽  
Edemilson Cardoso CONCEIÇÃO Da ◽  
Alessandra Gimenez MASCARENHAS ◽  
Emmanuel ARNHOLD ◽  
...  
Keyword(s):  
Japanese Quail ◽  
Feed Intake ◽  
Egg Production ◽  
Egg Quality ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Egg Mass ◽  
Feed Conversion ◽  
Antioxidant Additive ◽  
Weight Variation

SUMMARY The aim of this study was to evaluate the guava extract as an antioxidant additive in diets of Japanese quail breeders on the performance and egg’s quality. The experiment was conducted at University Federal of Goias. A total of 384 Japanese quail breeders were used, distributed in four treatments, with six replicates, with a total of 12 females and four males in each replicate. The treatments were performed with four levels of guava extract in the diets (0.0%, 0.3%, 0.6% and 0.9%). The guava extract contained the ellagic acid, considered the guava antioxidant active principle. The diets were isonutritive. Feed and water were offered ad libitum. The experimental period was 84 days. Egg production, feed intake, feed conversion ratio, egg mass, body weight variation and egg quality were evaluated. The results were submitted to analysis of variance and regression analysis. The adopted probability was 5%. Egg production, feed intake, feed conversion ratio and egg mass were not influenced by the use of guava extract. The yolk and albumen height, the Haugh Unit and the yolk and albumen index decreased linearly as the levels of guava extract in the diet increased. The diameter of the albumen was higher with the use of 0.48% of guava extract in the diet. The yolk color was affected by the guava extract, presenting a darker color with 0.50% of guava extract in the diet. It was concluded that the guava extract used as an antioxidant additive does not improve the performance and egg quality of Japanese quails.

scholarly journals Appraisal of purple coneflower (Echinacea purpurea) extract on production performance, internal organs, and gut microflora of japanese quail

2017 ◽  
Vol 40 ◽  
pp. 37230 ◽  
Author(s):  
Saeed Seifi ◽  
Rahem Khoshbakht ◽  
Hosna Hajati ◽  
Ali Gilani
Keyword(s):  
Drinking Water ◽  
Japanese Quail ◽  
Echinacea Purpurea ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Control Group ◽  
Gut Microflora ◽  
Feed Conversion ◽  
Internal Organs ◽  
Carcass Yield

An experiment was carried out to evaluate the effects of Echinacea purpurea (EP) extract at 5 levels (0, 0.25, 0.5, 1 or 2 mL L-1 of drinking water) on performance, internal organs and gut microflora of Japanese quail (Coturnix coturnix Japonica). The results showed that EP extract decreased feed intake and body weight gain of quails. The feed conversion ratio of quails fed with EP extract at the level of 0.5 ml L-1 drinking water was significantly decreased compared to the control group. Adding EP extract at the levels of 0.25, 0.5 or 1 mL L-1 drinking water decreased carcass yield of the birds (p < 0.05). The relative weight of internal organs of the birds fed different levels of EP extract was not significantly different. Birds consumed EP extract at the levels of 1 or 2 mL L-1 drinking water had lower ileal aerobic bacteria population compared to the control group; however, the ileal Coliform population increased by EP extract supplementation (p < 0.05). Results of the present study indicated that using EP extract at the level of 0.5 mL L-1 drinking water could improve feed conversion ratio of quails; however, it decreased the carcass yield of the birds. 

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