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Articles by Yachun Wang
Total Records ( 2 ) for Yachun Wang
  Jun Chen , Yachun Wang , Yi Zhang , Dongxiao Sun and Yuan Zhang
  Bio-economic profit models were used on Chinese Holstein production system to evaluate economic values for production traits Milk Yield (MY), Fat Percentage (FP), Protein Percentage (PP)) growth traits Mature Live Weight (LW) and functional traits Age at First Calving (AFC), Calving Interval (CI), Production Lifetime (PL) and Somatic Cell Count (SCC) traits. Economic and production parameters were derived from large scale dairy farms located in Beijing in 2008 to characterize Chinese Holstein production system, which were described according to their growth stage and levels of feed and management environment. Revenue and cost were calculated according to different age group in dairy production. With a fixed number of cows per herd as a basis of evaluation, two milk payment systems were considered. Under payment system based on milk volume, estimated economic values were RMB 1.99 (MY, kg),-4.72 (PP, %), -8.00 (FP,%), 0 (SCC), -4.96 (AFC, days), 1.71 (CI, days), -2.73 (LW, kg) and 1.58 (PL, days), respectively. Under payment system based on milk composition and quality (fat percentage, Protein Percentage, SCC), changes in the economic values were only observed for PP (64.21), FP (41.24), SCC (-393.88), respectively. Sensitivity of economic values was studied, factors considered included the price of milk, price of beef, price of feed and other production variables. Economic values of MY, PP and FP increased significantly with higher price of milk and the beef price had no effect on the economic values of milk production traits. With higher feed price, the economic value for the grow traits and functional traits increased, but that for milk production traits decreased. In summary, evaluated economical value for different traits showed that production and functional traits would have a positive effect, while growth traits would have a negative effect on profitability of Chinese Holstein production system and price of milk and feed were identified as the main factors influencing profit. The bio-economic profit model constructed for Chinese Holstein breeding system could provide general ideas for breeding goals setting in Chinese dairy breeding system in the future.
  Tahir Usman , Gang Guo , Syed Muhammad Suhail , Muhammad Subhan Qureshi and Yachun Wang
  The present study was aimed at estimation of the genetic parameters and the effect of season and year of birth on performance traits of Holstein Friesian cattle maintained at Agricultural University Dairy Farm Peshawar, Pakistan from the period 1999 to 2008. Genetic parameters for studied traits were estimated using multiple-trait animal model by DMU Software package with year and season of birth as fixed effects. The effect of year and season of birth was found significant on all the traits under study. Mean Puberty Age (PA), Age at First Calving (AFC) first lactation 305 Days Milk Yield (305 DMY) and Reproductive Efficiency (RE) were 794.32±45.35 days, 1172.27±79.65 days, 3553±423.26 kg and 62.50±3.56%, respectively. Heritability estimates of PA, AFC, RE and first lactation 305 DMY were 0.17, 0.11, 0.12 and 0.22, respectively. Genetic correlation of PA with AFC was highly positive (0.67) whereas, genetic and phenotypic correlation of RE with PA and AFC was moderately negative. Genetic correlations of 305 DMY was highly negative with AFC and RE and moderately negative with PA. In the present study, Holstein outperformed indigenous breeds in terms of performance and genetically inheritable potential under the prevailing subtropical conditions of Pakistan. RE parameter studied is useful indicator for moderately inheritable reproductive traits and should be considered in future studies using large dataset. Interestingly, the genetic parameters of holstein in the present study were in normal range but the production was markedly lower than other studies in the temperate environmental conditions.
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