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Articles by Salim Bahashwan
Total Records ( 2 ) for Salim Bahashwan
  Salim Bahashwan
  Background and Objective: There is almost no study in the literature about the Dhofari cow breed lactation curve, as it is the main source of dairy products for large population in Sultanate of Oman and the only one of two native cattle breed in Arabia. The objective of this study was to use different mathematical nonlinear model functions to describe and predict the Dhofari cow breed. Materials and Methods: A total data of 1640 test day records of monthly milk production between years 2010 and 2014, from 173 dairy herds located at Salalah Livestock Research Station was analyzed using GLM method (SPSS 2010). Models (Gompertz, Von Bertalanffy, Logistic, Brody, Wood, Wilmink, Cobby and LeDu, Cappio Borlino and Dijkstra) for goodness of fit using adjusted coefficient of determination (R2), root mean square error (RMSE), akaikes information criterion (AIC) and bayesian information criterion (BIC). Results: Gompertz model provided the best lactation curve than the other models due to the lower values of RMSE (4.05), AIC (38.50) and BIC (6.83) but the Dijkstra model did not fit the observed data as well as the rest. The peak yield (9.72 kg), peak time (60 days), 305 days milk (1580 kg) and persistency (90.65%) were best estimated by the Gompertz model. Conclusion: Gompertz model provided the best estimation for the lactation curve for the Dhofari cows.
  Salim Bahashwan , Abdulla Salim Alrawas and Salim Alfadli
  The present study was carried out to find the effect of sire birth weight on the Dhofari calf’s breed growth traits of birth weight, weaning weight, yearling weight, pre-weaning, post-weaning daily gain, dam gestation length and calving ease score . Seasonal interaction with the sire birth weight effect on calf’s growth traits was also investigated. Growth traits of calf’s were classified to seasonal (cold, hot and temperate) interaction with sire birth weight class. Data of different weight records of 558 calf’s’ and their relative dams sired by 40 Dhofari bulls breed from Salalah Livestock Research Station were used in this study. The different calf’s growth traits were classified into three classes according to sire birth weights (high, medium and low). The data were analyzed by multivariate General Linear Model (GLM) using SPSS. Analysis showed significant (p<0.05) effect of sire birth weight class on all calf’s growth traits. Calf’s of high class sire birth weights proved to be heavier for all growth traits than sired by medium and low class bulls. There was a strong positive significant (p<0.01) correlation between sire birth weight class and all calf’s growth traits with the highest being with calf’s birth weight. The interaction between season and sire birth weight class showed significant (p<0.05) effect on calf’s pre-weaning and post weaning daily gain during the temperate season but none (p>0.05) for the other growth traits of birth weight, weaning weight and yearling weight. Heavier calf’s sired by high sire birth class had a significant (p<0.05) longer dam gestation length than those of low class sire birth weights. There was a significant (p<0.05) correlation between sire birth weight class and gestation length of the dam. However, there was no significant (p>0.05) effect of calf’s sex on the dams gestation length. Analysis showed that dams sired by high sire birth weight class had heavier calf’s and this had a significant (p<0.05) effect on the dams calving ease of score in comparison to dams sired by medium and low sire birth classes.
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