Optimum duration of performance testing for growth rate, feed intake, and feed efficiency in growing Boer bucks

2012 ◽  
Vol 104 (1-3) ◽  
pp. 114-121 ◽  
Author(s):  
W. Hu ◽  
T.A. Gipson ◽  
S.P. Hart ◽  
L.J. Dawson ◽  
T. Sahlu ◽  
...  
Keyword(s):  
Growth Rate ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Performance Testing ◽  
Optimum Duration

Effects of lasalocid and protein levels on feed intake and growth rate of Awassi lambs

1997 ◽  
Vol 1997 ◽  
pp. 187-187
Author(s):  
M. M. Muwalla ◽  
M. Y. Harb ◽  
T. F. Crosby
Keyword(s):  
Growth Rate ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Published Data ◽  
Growth Promoter ◽  
Feed Conversion ◽  
Protein Levels ◽  
Feedlot Lambs ◽  
Lamb Growth ◽  
Awassi Lambs

Lasalocid is a polyether antibiotic derived from the fermentation of streptomyces lasaliensis used as a coccidiostat in sheep. There are varying literature reports on lamb growth rate and feed intake when lasalocid is included in the diet of feedlot lambs. While some reports have shown that lasalocid enhances feed efficiency in ruminants by decreasing feed intake and either maintaining or improving rate of gain others indicate that lasalocid did not have any effect on lamb growth rates or feed efficiency (Stobart et al., 1987). Also, when lasalocid was fed to Chios lambs, growth rate was increased but there was no improvement in feed conversion efficiency (Hadjipanayiotou et al., 1988). There are no published data in the literature relating to the use of lasalocid as a growth promoter in the Awassi breed of sheep fed complete diets and the purpose of this study was to investigate the effect of lasalocid with two levels of protein on the growth rate and feed efficiency of weaned male and female Awassi lambs.

Genetic variation in net feed efficiency in Hereford cattle and its association with other production traits

1999 ◽  
Vol 1999 ◽  
pp. 47-47
Author(s):  
R.M. Herd ◽  
S.C. Bishop
Keyword(s):  
Growth Rate ◽  
Genetic Variation ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Genetic Correlations ◽  
Feed Consumption ◽  
Production Traits ◽  
Performance Measurements ◽  
Hereford Cattle ◽  
Rate Selection

Net feed efficiency refers to variation in feed consumption between animals net of requirements for maintenance and production, and may be measured as residual feed intake (RFI). Because RFI is independent of liveweight (LW) and growth rate, selection for improved net feed efficiency is likely to reduce feed intake with little change in growth. The purpose of this study was to establish whether there exists genetic variation in RFI in young British Hereford bulls, and to determine the phenotypic and genetic correlations of RFI with key production traits.The data consisted of performance measurements on 540 bull progeny of 154 British Hereford sires, collected over ten 200-day postweaning performance tests conducted between 1979 and 1988. The traits analysed were food intake (FI), 200 to 400-day daily gain (ADG), 400-day weight (W400), predicted carcass lean content (LEAN), lean growth rate (LGR), food conversion ratio (FI/ADG) and lean FCR (LFCR; FI/(ADG x LEAN), described by Bishop (1992).

RESPONSE OF GROWING-FINISHING PIGS TO DIETARY INCLUSION OF GREEN FOXTAIL (Setaria viridis) SEEDS

1984 ◽  
Vol 64 (4) ◽  
pp. 1063-1066
Author(s):  
A. G. CASTELL
Keyword(s):  
Growth Rate ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Growing Pigs ◽  
Carcass Composition ◽  
Apparent Digestibility ◽  
Finishing Pigs ◽  
Setaria Viridis ◽  
Green Foxtail ◽  
Ad Libitum

Increasing the level of wheat screenings (95% green foxtail seeds) from 0 to 25% in diets fed ad libitum over the period from 34 to 89 kg liveweight resulted in an increased daily feed intake (P < 0.05), reduced (P < 0.05) feed efficiency and apparent digestibility, but produced no consistent effects on growth rate or carcass composition. Key words: Growing pigs, green foxtail, Setaria viridis, carcass, digestibility

scholarly journals The performance testing of boars II. Phenotypic and genetic correlations

1971 ◽  
Vol 43 (2) ◽  
pp. 103-110
Author(s):  
Elsi Ettala
Keyword(s):  
Growth Rate ◽  
Total Variation ◽  
Feed Efficiency ◽  
Genetic Correlations ◽  
Performance Testing ◽  
Stepwise Multiple Regression ◽  
Daily Growth ◽  
Fat Thickness ◽  
Selection For ◽  
Different Characteristics

In this study the interrelationships between the various characteristics for the boar material described in the first part were analysed. For this purpose the phenotypic, genetic and intra-sire correlation matrix as well as stepwise multiple regression analyses were calculated by computer for the material of 138 boars. The results showed that there was a very strong correlation between fat thickness and testing score (rG = —0.95***, rP = —0.88***). Of the total variation in the testing score 85.2 % was accounted for by the variation in fat thickness. Although the testing score is made up of the points for fat thickness and growth, the latter accounted for only 9.2 % of the variation in the score. Daily growth was positively associated with the testing score and negatively with the amount of feed units required per growth kilogram, but significantly so only for the intra-sire correlations; the genetic correlations being even, contrary to expectation. The association between growth rate and fat thickness was positive (rG = 0.47***). Of the total variation in feed efficiency the testing score accounted for 35.6 %. A high testing score was associated with a favourable feed efficiency (rg = —0.63***). By correlation studies attempts were also made to find out whether it would be possible to shorten the testing period without decreasing the accuracy. The correlations show that the growth rate can be predicted with an appreciable degree of accuracy already from the weight at the 8th testing week. The correlations between the above weight and growth rates were; rG = 0.84***, rP = 0.82***. From the associations between different characteristics one can decide on the suitability of testing and the consequences of selection for particular traits.

Primary genome scan to identify putative quantitative trait loci for feedlot growth rate, feed intake, and feed efficiency of beef cattle1

2007 ◽  
Vol 85 (12) ◽  
pp. 3170-3181 ◽  
Author(s):  
J. D. Nkrumah ◽  
E. L. Sherman ◽  
C. Li ◽  
E. Marques ◽  
D. H. Crews ◽  
...  
Keyword(s):  
Growth Rate ◽  
Quantitative Trait Loci ◽  
Feed Intake ◽  
Quantitative Trait ◽  
Feed Efficiency ◽  
Genome Scan ◽  
Trait Loci

scholarly journals ASSESSMENT OF PROCESSED ROCK PHOSPHATE AS SOURCE OF INORGANIC PHOSPHORUS AND SUBSTITUTE FOR BONE MEAL IN BROILER DIETS

2021 ◽  
Vol 27 ◽  
pp. 45-49
Author(s):  
E. I. IKANI ◽  
A. O. ADUKU ◽  
P. N. OKOH
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Rock Phosphate ◽  
Control Diet ◽  
Inorganic Phosphorus ◽  
Broiler Chicks ◽  
Bone Meal ◽  
Treatment Groups

A feeding trial was conducted for six weeks to assess the optimum replacement value of processed rock phosphate (PRP) for bone meal and as a source of inorganic phosphorus in maize-cotton seed meal based diets. A total of 144 day old Snack 80 strain broiler chicks were used. Triplicate groups of 12 birds were randomly placed on 4 diets containing 0. 1.8, 2.8 and 5.64% PRP which contributed 0,0.16, 0.25 and 0.5% inorganic phosphorus in the diets respectively, Results showed PRP levels in dicts had no significant (P>0.05) effect on weight gain, growth rate and feed intake at 0 - 4 weeks. When 2.8% PRP replaced 2% of bone meal, feed efficiency was not significantly different from those birds fed 3% bone meal in control diet. Inclusion of 5.64% PRP significantly (P<0.01) depressed feed efficiency more than other treatment groups during the period. Addition of 5.64% PRP supported higher growth rate than other treatment groups during 5 - 6 weeks, but this was not significantly different from birds fed on control and 2.8% PRP diets. Feed efficiency was significantly (P>0.01) lowest in the group fed on 1.8% PRP diet. Weight gain, growth rate and feed intake were not significantly (P<0.01) affected by treatments during 0-6 weeks. It was concluded that 5.6+% PRP which supplied 0.5% inorganic phosphorus supported optimum performance in broiler birds replacing 100% bone meal in a liu diet and caused growth that was equinob-ut to the group fed on 3% bone meal mentraal diet.   

Influence of zinc on growth, somatomedin, and glycosaminoglycan metabolism in rats

1987 ◽  
Vol 252 (1) ◽  
pp. E21-E26 ◽  
Author(s):  
M. S. Bolze ◽  
R. D. Reeves ◽  
F. E. Lindbeck ◽  
M. J. Elders
Keyword(s):  
Growth Rate ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Serum Insulin ◽  
Relative Activity ◽  
Male Rats ◽  
Ad Libitum ◽  
Glycosaminoglycan Metabolism ◽  
And Control ◽  
And Cartilage

Weanling male rats were fed control ad libitum, zinc-deficient (ZD, 1 ppm zinc) or pair-fed (PF) control diets for 13 days. Rats subsequently were refed control diets for up to 8 days and serially killed. ZD and PF diets significantly decreased growth rate, feed intake, and feed efficiency compared to controls. Body weight and feed efficiency, but not feed intake, were significantly less in ZD compared to PF. Bone zinc was 315, 286, and 109 micrograms/g (p less than 0.0001) for control, PF, and ZD at the end of depletion. 35SO4 uptake by glycosaminoglycans (GAG) was significantly less in ZD compared to either control ad libitum or PF rats. Xylosyltransferase activity was decreased significantly below PF and control by ZD, suggesting depressed enzyme activity and/or decreased GAG acceptor sites. Bioassayable somatomedin (Sm) activity was 0.81, 0.42 and 0.33 +/- 0.09 relative activity for control, PF and ZD at the end of depletion. Sm was statistically less in ZD compared to PF at day 2 and 5 of refeeding, but not at the end of depletion. Sm activity and GAG metabolism returned to normal after refeeding for 2–5 days in PF and for 5-8 days in ZD rats. Serum insulin but not glucose was significantly depressed by ZD and PF diets. Thus, zinc deficiency depressed growth and cartilage metabolism and was associated with decreased Sm activity and insulin levels. Some of these changes could be attributed to decreased feed intake as a result of ZD.

Optimum postweaning test for measurement of growth rate, feed intake, and feed efficiency in British breed cattle.

1997 ◽  
Vol 75 (8) ◽  
pp. 2024 ◽  
Author(s):  
J A Archer ◽  
P F Arthur ◽  
R M Herd ◽  
P F Parnell ◽  
W S Pitchford
Keyword(s):  
Growth Rate ◽  
Feed Intake ◽  
Feed Efficiency

scholarly journals Relative Growth Rate of Beef Cattle Expressed Using Factors Related to Feed Intake, Maintenance Requirements and Feed Efficiency

10.5109/24195 ◽  
1997 ◽  
Vol 42 (1/2) ◽  
pp. 87-93
Author(s):  
Masataka Shimojo ◽  
Takashi Bungo ◽  
Yoshimi Imura ◽  
Manabu Tobisa ◽  
Naoki Koga ◽  
...  
Keyword(s):  
Growth Rate ◽  
Beef Cattle ◽  
Relative Growth Rate ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Relative Growth ◽  
Maintenance Requirements
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