Growth Curve of Commercial Broiler as Predicted by Different Nonlinear Functions
Issue:
Volume 1, Issue 2, November 2015
Pages:
6-9
Received:
25 September 2015
Accepted:
6 October 2015
Published:
14 October 2015
DOI:
10.11648/j.ajasr.20150102.11
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Abstract: This study was carried out to identify the better function that fit the growth curve in broiler depending on some criteria [coefficient of determination (R2), Adjusted R2 and mean square error (MSE)]. Eighty day-old unsexed broiler chicks (Ross 308) were used in this study for the period from 6/4/2015 to 17/5/2015. The growth data of broiler through 6th weeks were subjected to three nonlinear functions (Weighted Least Square (WLS), Gompertz, and Logistic). Results revealed that the WLS function was the best for fitting the growth curve in the broiler as compared with the two functions. The estimated values of asymptotic weight (β0), the integration constant (β1) and maturity rate (β2) parameters according to WLS model were 2088, -3.68 and 0.14 respectively. In conclusion: The results confirmed that WLS function was more appropriate to describe the growth curve in the broiler (Ross 308) as compared with other functions.
Abstract: This study was carried out to identify the better function that fit the growth curve in broiler depending on some criteria [coefficient of determination (R2), Adjusted R2 and mean square error (MSE)]. Eighty day-old unsexed broiler chicks (Ross 308) were used in this study for the period from 6/4/2015 to 17/5/2015. The growth data of broiler throu...
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Monitoring the Effect of Lead Acetate on Histopathological Changes in Barbus Sharpeyi
Inam B. Faleh,
Noor M. Salman,
Abd-Almotalib J. Al-Rudainy,
Ali J. Shubber
Issue:
Volume 1, Issue 2, November 2015
Pages:
10-17
Received:
27 September 2015
Accepted:
8 October 2015
Published:
15 October 2015
DOI:
10.11648/j.ajasr.20150102.12
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Abstract: The present study was carried out to determine the effect of lead acetate on histopathological changes in Bunni (Barbus sharpeyi), as well as the description of fish behavior. A total of 300 fingerlings were used in the laboratory of fish diseases in the College of Veterinary Medicine - University of Baghdad for the period between 1/3 to 1/6/2013. Fish were distributed randomly into four treatments in addition to control group. First treatment (T1) contained lead acetate 0.42 mg/l with replacement water aquarium entirely per two days and added lead acetate continuously, the second treatment (T2) contained lead acetate 0.42mg/l with replacement water aquarium entirely per two days without adding lead acetate, third treatment (T3) contained lead acetate 0.21mg/l with replacement water aquarium entirely per two days and adding lead acetate continuously, fourth treatment (T4) contained lead acetate 0.21mg/l with replacement water aquarium entirely per two days without adding lead acetate. In order to estimate LC50 used 120 fingerlings of B. sharpeyi, were exposed to 1, 2, 3, 4, 5 and 6 mg/l. The LC50 of lead acetate was 4.24 mg/l for 72h. of exposure. Fish behavior showed abnormalities after exposure to the various lead acetate concentrations such as swimming disorders, the fish tended together at the surface, fast movement, aggregate in aquarium border, weakness, with increasing in the speed of movement of the operculum, of T1,T2 and T3 and decreasing in feeding process in T1 and T3. Histopathological changes were detected in gills characterized by lamellar fusion, lifting of secondary lamella. The main findings in liver tissue are hydropic swelling and fatty degeneration of some hepatocytes, focal or diffuse necrosis. Kidney showed varying degrees of tubular necrosis with severe congestion together with melanomacrophage infiltration. Spleen observed severe destruction in spleen, parenchyma, and severe reduction in hemopoitic tissue.
Abstract: The present study was carried out to determine the effect of lead acetate on histopathological changes in Bunni (Barbus sharpeyi), as well as the description of fish behavior. A total of 300 fingerlings were used in the laboratory of fish diseases in the College of Veterinary Medicine - University of Baghdad for the period between 1/3 to 1/6/2013. ...
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Analysis of Repeated Measures Data of Iraqi Awassi Lambs Using Mixed Model
Firas Rashad Al-Samarai,
Fatten Ahmed Mohammed,
Falah Hamed Al-Zaidi,
Abbas Fawzy Al-Kalisy
Issue:
Volume 1, Issue 2, November 2015
Pages:
18-26
Received:
30 October 2015
Accepted:
7 November 2015
Published:
13 November 2015
DOI:
10.11648/j.ajasr.20150102.13
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Abstract: In this study, repeated records of body-weight of Awassi lambs were considered for analysis. Records included up to five ‘repeated records’ of body-weight per lamb, measured between birth weight and 4th month of age, were used in the analysis. Most statistical approaches in such data are based on analysis of variance (ANOVA). However, the assumption that datum are independent is usually violated since several measures are performed on the same subject. As a result, standard regression and ANOVA may produce invalid results of repeated measures data because they require mathematical assumptions that were inconsistent with repeated data. The newest approach to analyzing of the repeated measurements is a mixed-model analysis. Advocates of this approach claimed that it provides the “best” approach to the analysis of repeated measurements. Therefore, the objective of the study was to investigate the effect of flock on growth performance of Awassi lambs using the mixed model. Three models was used: the first model consist of the effect of flock, time and flock by time interaction, the second model includes the same factors besides the quadratic effect of time, and the third model includes all factors in second model besides the time by time by flock interaction. Results revealed that the third model was better than other models and the effect of all factors on body weight of lambs was significant (P< 0.05) except the effect of flock, which was non-significant.
Abstract: In this study, repeated records of body-weight of Awassi lambs were considered for analysis. Records included up to five ‘repeated records’ of body-weight per lamb, measured between birth weight and 4th month of age, were used in the analysis. Most statistical approaches in such data are based on analysis of variance (ANOVA). However, the assumptio...
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