scholarly journals The Effect of Selection for Body Weight and Rate of Production on Feed Efficiency of Egg Production

1970 ◽  
Vol 49 (5) ◽  
pp. 1178-1183 ◽  
Author(s):  
B.S. Reinhart ◽  
F.N. Jerome
Keyword(s):  
Body Weight ◽  
Feed Efficiency ◽  
Egg Production ◽  
Selection For

scholarly journals PSVIII-38 Late-Breaking Abstract: Estimating genetic parameters of feed efficiency traits in American mink

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 347-347
Author(s):  
Pourya Davoudi ◽  
Duy Ngoc Do ◽  
Guoyu Hu ◽  
Siavash Salek Ardestani ◽  
Younes Miar
Keyword(s):  
Body Weight ◽  
Genetic Correlation ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Fixed Effects ◽  
Genetic Parameters ◽  
American Mink ◽  
Genetic Correlations ◽  
Final Body Weight ◽  
Selection For

Abstract Feed cost is the major input cost in the mink industry and thus improvement of feed efficiency through selection for high feed efficient mink is necessary for the mink farmers. The objective of this study was to estimate the heritability, phenotypic and genetic correlations for different feed efficiency measures, including final body weight (FBW), daily feed intake (DFI), average daily gain (ADG), feed conversion ratio (FCR) and residual feed intake (RFI). For this purpose, 1,088 American mink from the Canadian Center for Fur Animal Research at Dalhousie Faculty of Agriculture were recorded for daily feed intake and body weight from August 1 to November 14 in 2018 and 2019. The univariate models were used to test the significance of sex, birth year and color as fixed effects, and dam as a random effect. Genetic parameters were estimated via bivariate models using ASReml-R version 4. Estimates of heritabilities (±SE) were 0.41±0.10, 0.37±0.11, 0.33±0.14, 0.24±0.09 and 0.22±0.09 for FBW, DFI, ADG, FCR and RFI, respectively. The genetic correlation (±SE) was moderate to high between FCR and RFI (0.68±0.15) and between FCR and ADG (-0.86±0.06). In addition, RFI had low non-significant (P > 0.05) genetic correlations with ADG (0.04 ± 0.26) and BW (0.16 ± 0.24) but significant (P < 0.05) high genetic correlation with DFI (0.74 ± 0.11) indicating that selection for lower RFI will reduce feed intake without adverse effects on the animal size and growth rate. The results suggested that RFI can be implemented in genetic/genomic selection programs to reduce feed intake in the mink production system.

RESPONSE TO SELECTION FOR BODY WEIGHT OR FEED EFFICIENCY IN MICE TESTED ON CORN, RYE AND WHEAT DIETS

1986 ◽  
Vol 66 (2) ◽  
pp. 389-397
Author(s):  
R. I. McKAY ◽  
R. J. PARKER ◽  
W. GUENTER
Keyword(s):  
Body Weight ◽  
Feed Efficiency ◽  
Mass Selection ◽  
Response To Selection ◽  
Initial Weight ◽  
Commercial Diet ◽  
Final Weight ◽  
Dc Line ◽  
Selection For ◽  
Seven Generations

Mass selection for adjusted feed efficiency (AFE, g gain/g feed) and adjusted body weight (ABW, g) of male mice was practiced for seven generations on each of three diets: corn, rye and wheat. The three experimental diets, fed between 21 and 35 d, were isocaloric (approximately 16.5 MJ GE kg−1) and isonitrogenous (CP approximately 13%). A common commerical diet (PC) was fed at all other times. With each diet two control lines, randomly mated, were tested on either the experimental diets (DC) or a commercial diet (PC). Selection was based upon linear adjustment to a common initial weight (10 g) for either final weight (ABW) or feed efficiency (AFE) measured between 21 and 35 d of age. Response was determined as a deviation from the appropriate DC line. All animals were placed in specially designed individual cages during the test period. Half-sib estimates of heritability in the PC line were 0.13(± 0.11) for ABW and 0.19(± 0.10) for AFE. Half-sib estimates pooled across lines and diets were 0.16(± 0.07) for ABW and 0.28(± 0.07) for AFE. Realized heritabilities for ABW were 0.24(± 0.06), 0.06(± 0.07) and 0.14(± 0.06) for the corn, rye and wheat diets, respectively. Response to selection for AFE was poor with the highest heritability obtained on the wheat diet (h2 = 0.13 ± 0.02). Key words: Selection, mice, body weight, feed efficiency, diets

Effect of feeding different levels of lysine and protein on the performance of WLH layers

2017 ◽  
Author(s):  
Naga Raja Kumari K ◽  
Ravinder Reddy V ◽  
Chinni Preetham V ◽  
Srinivas Kumar ◽  
D.Sen A.R. ◽  
...  
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Egg Production ◽  
Egg Mass ◽  
Egg Weight ◽  
Protein Levels ◽  
Lysine Concentration ◽  
Different Levels ◽  
Effect Of Feeding

A trial was conducted to evaluate the requirement of digestible lysine at various protein levels in the diet of WLH layers (BV-300) from 25-44 weeks of age. Layers (528) were fed with diets containing two protein levels i.e. 13.36 and 15.78 % each with 5 % concentration variations of lysine (0.50, 0.55, 0.60, 0.65, and 0.70) and a control with 17 % CP and 0.70 % lysine. Each diet was fed to six replicates of eight birds. Egg production, feed intake, body weight were not influenced either by the concentration of lysine or by level of protein in diet. Increased (P d” 0.05) egg weight and egg mass were observed with increasing lysine in diets. Better feed efficiency was observed with increasing lysine concentration. It can be concluded that WLH layers require approximately 0.65% lysine with 13.36% CP or 0.63% lysine with 15.78% CP (i.e. 598.80 vs 570 mg/h/day) in diet.

Evaluation of various molting methods with perspective of post-molting performance in Japanese quails

2017 ◽  
Author(s):  
Shaukat Ali ◽  
Raheela Akhtar ◽  
Muhammad Younus ◽  
Heinrich Neubauer ◽  
Hafez Hafez ◽  
...  
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Feed Efficiency ◽  
Egg Production ◽  
Aluminum Sulfate ◽  
Body Weight Gain ◽  
Feed Consumption ◽  
Feed Restriction ◽  
Japanese Quails ◽  
High Feed

The post-molting performance of 360 female Japanese quails was assessed using five molting methods including feed restriction along with supplementation of dietary levels of aluminum sulfate (AlSO4) and zinc oxide (ZnO) with two concentrations of 0.15% and 0.3%. None of the parameters studied were positively influenced by a single molting method. Body weight gain and feed efficiency were positively affected by higher concentration of ZnO while feed consumption was positively influenced by higher concentration of AlSO4. Similarly high feed efficiency was attributed to higher concentrations of both ZnO and AlSO4. On other hand body weight gain and feed efficiency were negatively influenced by 0.15% ZnO while egg production was worst by 0.15% AlSO4. As each of the molting method had different influence on the tested parameters and none of them could apply individually with perspective of better performance therefore the combinational use of molting methods is recommended according to the focused parameter

The effect of apple cider vinegar and mushroom stalk supplementation on laying hens

2018 ◽  
Author(s):  
Musa Karaalp ◽  
Vecihi Aksakal ◽  
Sevim Beyza Ozturk Sarikaya ◽  
Hilal Urusan ◽  
Bahri Bayram ◽  
...  
Keyword(s):  
Drinking Water ◽  
Body Weight ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Agaricus Bisporus ◽  
Egg Production ◽  
Performance Criteria ◽  
Control Group ◽  
Apple Cider ◽  
Treatment Groups

The aim of this trial was to study the effects of consuming water with apple cider vinegar (ACV) and feed including mushroom (Agaricus bisporus) stalk (MS) on performance and certain egg characteristics. The hens were separated into four treatment groups (with 4 replicates and 6 hens per replicate). The experimental groups were control (not consumed ACV and MS), ACV (3 ml/l drinking water), MS (20 g/kg feed) and ACV+MS (combination). At the end of the experiment, among the performance criteria tested, body weight, feed intake, egg production and weight of eggs, and feed efficiency were not affected by the treatments (P>0.05). Treatments had no effect on physical external and internal egg characteristics. The amount of yolk malondialdehyde of the ACV and MS groups was lower than the control group (P Less then 0.05) in stored eggs (28 d) (P Less then 0.05).

Effect of long term selection for juvenile body weight and egg production on semen quality in broiler breeder dam line

2017 ◽  
Vol 52 (2) ◽  
pp. 222
Author(s):  
M. Shanmugam ◽  
M. Niranjan ◽  
K. Rakesh ◽  
T.K. Bhattacharya ◽  
B.L.N. Reddy ◽  
...  
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Semen Quality ◽  
Broiler Breeder ◽  
Term Selection ◽  
Selection For

SELECTION LIMITS: HAVE THEY BEEN REACHED IN THE POULTRY INDUSTRY?

1984 ◽  
Vol 64 (2) ◽  
pp. 217-221 ◽  
Author(s):  
PETER HUNTON
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Multiple Objectives ◽  
Shell Quality ◽  
Key Words Genetics ◽  
Physiological Limit ◽  
Selection For ◽  
Hatching Eggs ◽  
Almost All ◽  
Commercial Turkey

Present emphasis is on the heavy turkey, grown to relatively heavy body weight and subsequently jointed and further processed. Rapid selection for broad-breasted conformation led to problems in natural mating; hence the fertilization of almost all commercial turkey hatching eggs by artificial insemination. Meat chickens have experienced similar selection for growth and conformation. While reproductive performance has not been affected as much as with turkeys, rate of lay, fertility and hatchability of meat chickens has room for improvement. Increased feed intake, in response to selection for growth improvements has led to increased fat deposition, an unwanted feature. Breeding programs for egg production stocks differ fundamentally from those for meat stocks because they are concerned with multiple objectives. Many of these are of low heritibility and some are antagonistic to others. Because of this, selection intensity for any one trait has not been as high as among meat chickens and turkeys. Selection for increased rate of egg production has often been based on "part record;" since this is measured at a time of maximum lay, this trait approaches what may be regarded as a physiological limit, but not necessarily a genetic one. Persistency of lay, on the other hand, shows potential for further improvement. Egg weight and body weight, as they determine feed efficiency, are discussed, as are egg interval and shell quality. No genetic limit has been reached for any of these traits. The application of genetic disease resistance to Marek's disease, for example, affords considerable scope for future improvements. The large resevoir of genetic diversity, coupled with the use of multiple objectives, suggests that even after 40 years of relatively intense selection, genetic variation does not appear to be exhausted. Key words: Genetics, selection, egg production, broilers, turkeys

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