oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 209 )

2018 ( 257 )

2017 ( 226 )

2016 ( 310 )

Custom range...

Search Results: 1 - 10 of 111928 matches for " O.O. Oni "
All listed articles are free for downloading (OA Articles)
Page 1 /111928
Display every page Item
Osborne Selection Index and Semen Traits Interrelationships In Rhode Island Red and White Breeder Cocks
M. Kabir,O.O. Oni,G.N. Akpa
International Journal of Poultry Science , 2007,
Abstract: Three hundred and sixty-one cocks from five hatches, one week apart, were used in this study. The birds which were made up of 203 birds from strain A (male line) and 158 birds from strain B (female line) were subjected to semen collection using the massage technique. The ejaculates were then subjected to both physical and chemical evaluations for semen quality analysis. The parameters considered were semen volume, semen colour, sperm progressive motility, sperm concentration, total sperm per ejaculate, concentration of live sperm and percent abnormal sperm. Results showed that the mean values for all the parameters lie within the acceptable range reported for normal cock semen. Moderate to high heritability estimates for most of the semen traits were also observed. The least square means (±SE) for semen volume, sperm progressive motility, sperm concentration, total sperm per ejaculate and concentration of live sperm cells obtained in this study were 0.42±0.02 ml, 73.46±2.04%, 1.47±0.15x109/ml, 64.15±5.67x109/ml and 86.45±2.63%. The heritability estimates obtained were 0.55±0.03 for semen colour, 0.45±0.08 for semen volume, 0.83±0.04 for sperm progressive motility, 0.52±0.06 for sperm concentration, 0.33±0.02 for total sperm count, 0.46±0.03 for concentration of live sperm cells respectively. High and positive genetic correlations between Osborne Selection Index and semen volume, semen colour, sperm concentration as well as with concentration of live spermatozoa were also obtained. The lowest value (0.008±0.010) of phenotypic correlation obtained was for total sperm per ejaculate and the highest value (0.066±0.027) was for semen volume. Therefore the genetic correlation between Osborne Selection Index and most semen traits were positive, hence, selection of males on the index values, currently been practiced in NAPRI, will not bring about any deterioration in semen quality. On the other hand, due to significantly negative genetic correlation between Osborne index and abnormal sperms, it will indirectly improve the semen quality of both lines which in turn may yield better fertility in the Rhode Island flock.
Stress Loops Effect in Ductile Failure of Mild Steel  [PDF]
O.O. Oluwole
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.84026
Abstract: A simulation study of effect of stress on mild steel microstructure has revealed stress loops at areas of stress application which are believed to be the root cause of the ductile failure morphology (cup and cone) in ductile alloys under plane strain conditions. The areas of concentration of these stress loops were observed to be that of subsequent instability (or necking) observed in mild steel and other materials of low friction (flow) stress. Shear stress loops with angular bearing of 450 to the tensile axis were observed to instigate both the failure site and shear morphology in these materials. In plane stress conditions, shear was seen to be that of a wave shape running obliquely to area of stress application resulting in oblique necking observed in thin mild steel sheets.
Estimation of Lifetime Fatality Risk from Indoor Radon in Some Offices in a Nigerian University
O.M. Oni,G.A. Isola,O.O. Oladapo,E.A. Oni
Research Journal of Environmental and Earth Sciences , 2012,
Abstract: This study aims at estimating the lifetime cancer risk from the determination of 222Rn concentration level in some offices in Ogbomoso, Southwestern Nigeria. The measurement of the indoor 222Rn concentration levels at some offices in Ladoke Akintola University of Technology (LAUTECH) Ogbomoso, Nigeria was carried out using an active electronic radon gas detector, safety Pro3 (model HS71512) between February and July 2011. The result of the measurement showed that the average radon concentration is 26.3±4.17 Bq/m3. This value translated to an annual effective dose of 0.13 mSv/y and lifetime fatality risk of 9.94×10-6. These values which were found to be higher than values reported for some countries were however lower than the world average value and below the recommended action level. Thus, the results of this work have shown that the exposure to indoor radon at the offices considered is of low risk of fatal cancer occurrence due to radon inhalation.
Genetic and Phenotypic Relationships Between Mcnally Model Parameters and Egg Production Traits
O.O. Oni,B.Y. Abubakar,N.I. Dim,O.E. Asiribo
International Journal of Poultry Science , 2007,
Abstract: The monthly egg production data of Rhode Island Red (strain A) and White (strain B) chickens were used to estimate the genetic and phenotypic relationships between egg production traits and curve parameters obtained from fitting the McNally model to 52-wk laying records. A total of 356 and 292 records for strains A and B, respectively, were included in a variance component analysis of a two factor nested classification - dams within sire. The estimates of heritabilities and correlations for production traits were moderate to high, while the values obtained for the curve parameters varied from low to moderate. The estimates of correlations of part-productions with 52-week total were comparatively higher than the values obtained for curve parameters with 52-week total. The low estimates of heritability obtained for curve parameters indicated that it would be better to select on functions of the parameters (such as total production or part-year production), which had higher estimates, rather than individual curve parameters. The high genetic correlation between part-year production and total annual production suggests that selection for the latter based on the former would not diminish genetic progress. The decreased generation interval that would result from selection on part record will probably more than offset the loss in efficiency if records are taken for about half of the full laying year.
Effects of Underfeeding on Semen Quality of Rhode Island Cocks
M. Kabir,O.O. Oni,G.N. Akpa,I.A. Adeyinka
Pakistan Journal of Biological Sciences , 2007,
Abstract: Fifty Rhode Island chickens were randomly assigned to five treatments with ten cocks in each treatment. Group I cocks (full fed control) received 140 g of a 16% CP growers ration per cock per day. Cocks in Group II, III, IV and V received 98, 70, 42 and 28 g of the same ration per cock per day, representing 70, 50, 30 and 20% of Group I intake, respectively. The feeding trials lasted for 8 weeks during which one ejaculate per day was collected from each cock using the massage technique. The ejaculated semen samples were subjected to both physical and biochemical evaluations. Results showed that cocks that were severely underfed (i.e., Groups IV and V) took significantly longer time (p<0.01) to ejaculate. In addition, ejaculation failures were encountered more frequently with the severely underfed cocks than in cocks that were moderately underfed (i.e., Groups II and III). There were however, no significant differences in most of the biochemical parameters between cocks I all the treatment groups. Ejaculate volume, progressive sperm motility and sperm concentration were significantly depressed (p<0.01) in the severely underfed cocks than in the moderately underfed cocks. Thus, this study revealed that providing Rhode Island red and white cocks with one-half to three-quarter (i.e., 50-70%) of their normal daily ration would neither undermine their semen producing ability nor affect their semen quality adversely.
Growth and Subsequent Egg Production Performance of Shika-Brown Pullets Fed Graded Levels of Cooked Lablab purpureus Beans
I.A. Adeyinka,O.O. Oni,A. Abeke,I.I. Dafwang
Pakistan Journal of Biological Sciences , 2007,
Abstract: : The lablab seeds were cooked for 30 min, sundried for three days and thereafter milled and incorporated into chickens’ diets. Six treatments, comprising of six dietary levels of lablab at 0.0, 7.5, 15.0, 22.5, 30.0 and 37.5%, respectively was fed during the grower’ s phase. Results obtained for the growers phase indicate that final weight (g/bird), weight gain (g/bird) and feed cost (N kg- 1) decreased significantly (p<0.05) as the level of lablab increased in the diet. Feed intake (g/bird and g/bird/day) as well as feed cost (N/bird) and total cost (N/bird) also decreased significantly (p<0.05) as the level of lablab increased in the diet up to 22.5% inclusion level before increasing as the level of lablab in the diets continued to increase. The level of lablab in the diet had no effect on mortality throughout the experimental period. In addition haematological parameters such as Packed Cell Volume (PCV), Haemoglobin (Hb) and Total Protein (TP) were not significantly (p<0.05) affected by feeding diets containing graded levels of cooked lablab beans to pullets. Results obtained during the laying phase indicates that feeding lablab seed meal up to 22.5% in the diets at the growers stage had no significant adverse effect (p<0.05) on final weight, feed intake, feed efficiency, percent henday and henhoused egg production, percent production at peak, kilogramme feed per twelve eggs, feed cost per twelve eggs, Haugh Unit and yolk index. However, age of birds at first egg, age at 50% production and age at peak egg production were increased significantly (p>0.05) with increase in the level of lablab seed meal in the growers diets.
Heritability Estimates and the Interrelationships of Body Weight and Shank Length in Rhode Island Red and White Chickens
M. Kabir,O.O. Oni,G.N. Akpa,I.A. Adeyinka
Pakistan Journal of Biological Sciences , 2006,
Abstract: Data on body weight and shank length measurement of 361 birds from 5 hatches, one week apart were analysed to obtain heritability estimates for body weight and shank length at 20, 30 and 40 weeks of age, as well as to establish the genetic and phenotypic correlations between the traits. The mean values for body weight at various ages showed good performance of all birds. The heritability estimates observed for body weight and shank length decreases with increasing age of birds. This observation agreed with the reports of some workers and disagreed with the findings of others. Differences however, in heritability estimates could be attributed to differences in method of estimation, breed, environmental effects and sampling error due to small data or sample size. There were positively high genetic and phenotypic correlations between body weight and shank length at these ages. The coefficient of genetic correlation (rg) ranged between 0.582 and 0.645, while the coefficient of phenotypic correlation (rp) ranged between 0.613 and 0.816. High and positive genetic and phenotypic correlations between body weight and shank length suggest that it was possible to predict body weight of live Rhode Island chickens on the basis of their shank length measurement, as an aid to farmers in areas where sensitive weighing scales are not readily available.
Genetic Parameter Estimates of Body Weights of Naked Neck Broiler Chickens
I.A. Adeyinka,O.O. Oni,B.I. Nwagu,F.D. Adeyinka
International Journal of Poultry Science , 2006,
Abstract: The chicks used in this experiment were obtained from a population of naked neck broiler chickens that has been kept in NAPRI since 1998. Six Hundred chicks were obtained from four hatches, one week apart. At hatch, pedigreed chicks were wing-banded and housed on deep litter in an open house. Body weights were measured biweekly up to 8 weeks of age. Other measurements taken include Neck length, Back length, keel length and breast angle. The general least square means were 37.22 ± 0.32, 210.46 ± 1.97, 744.33 ± 4.31, 1351.3 ± 7.91 and 2428.1 ± 14.61g for wt at day old (WT0D), weight at 2 weeks (WT14D), weight at 4 weeks (WT28D), weight at 6 weeks (WT42D) and weight at 8 weeks (WT56D), respectively. While measurements taken included Neck length, Back length, keel length and breast which were 7.31 ± 0.06, 15.99 ± 0.05, 5.63 ± 0.04, 10.44 ± 0.04cm respectively. The heritability estimates ranged from low value of 3.013 ± 0.08 for keel length to 0.315 ± 0.22 for WT0D. There were negative genetic correlations between WT0D and other traits. This study showed that additive heritabilities are low for linear body measurement and moderate for body weight for naked neck chickens during rearing.
Components of Variance for Some Economic Traits among Rhode Island Chicken Bred in the Northern Guinea Savanna Zone of Nigeria
I.A. Adeyinka,O.O. Oni,B.I. Nwagu,F.D. Adeyinka
International Journal of Poultry Science , 2006,
Abstract: The data used to calculate the variance components of various production traits was obtained from records of about 4000 hens daughters of about 180 cocks mated to about 1,500 dams and collected over 5 year period. Two strains of Rhode Island Chickens were involved in this study. Within the red strain population sire`s contribution to total variation in age at first egg did not exceed 8.6% across the year and 6.9% in the white strain. Except for body weight at 40 weeks of the red strain where the contribution of the sire exceed 14%, the contribution of the sire to the total variation for all the economic traits considered in this study were generally low for both strain of the layer type chickens under consideration. Generally dam component of variance were higher most of the time and in many traits within the red strain population.
Growth Performance, Nutrient Utilization and Carcass Characteristics of Rabbits Fed Malted Sorghum Sprout (MSP) Based Diets
A.V. Jegede,A.O. Fafiolu,A.O. Oni,O.J. Faleye,O.O. Oduguwa
Journal of Animal and Veterinary Advances , 2012,
Abstract: Twenty four hybrid weaner rabbits of both sexes were used to evaluate the usefulness of malted sorghum sprout. The rabbits were randomly allotted to four dietary groups of 6 rabbits and three replicates of 2 rabbits each. The MSP was incorporated into the diet at 0, 10, 20 and 30% levels. The experiment lasted for 56 days. Feed and water were supplied ad libitum. The performance characteristics, nutrient utilization, carcass characteristics and economics of production were measures of response. The result showed that, the final live weight and daily weight gain of rabbits on 0 and 20% MSP diets were highest (p<0.05). The daily feed intake of rabbits on MSP diets were significantly (p<0.05) lower than those on 0% MSP. The dry matter, crude protein and crude fibre digestibility significantly declined (p<0.05) as the level of MSP inclusion increases. Energy intake and energy retained followed a similar trend. Carcass weight, liver, kidney and heart weights were significantly (p<0.05) influenced by the dietary treatment. Less cost was incurred in producing a kilogram of rabbit when fed 20 and 30% MSP levels. 20% level of inclusion in rabbit diet could be of benefit in terms cost reduction and better growth.
Page 1 /111928
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.