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  • Küçük Resim
    Öğe
    An econometric approach for prediction of optimal egg production period by coefficient of economic efficiency and multiphasic analysis
    (2004) O?uz C.; Parlat S.S.; Peker K.
    The present paper uses econometric methods and presently available multiphasic analysis technique and coefficient of economic efficiency to economically characterize optimal egg production period under the economic conditions of Turkey. The state-of-the-art econometric modeling and classic methods used currently for regulatory decision-making in the world are described. Based on this evaluation, needs for future research are defined. It is concluded from our work that mathematical modeling of the economically optimal production time using the coefficient of economic efficiency would improve economic profitability. The classical method of economic optimization in animal production is not suitable for all kinds of economic assessments. A range of different approaches is necessary so that the method used is the most appropriate for the data available and for the economic risk characterization issue. In this research, used basic data for evaluation were: total marginal income, total marginal food plus cumulative pullet cost, total marginal net income, marginal food conversion ratio cost plus marginal pullet cost is coefficient of economic efficiency. After the mathematical function between production period, and coefficient of economic efficiency was calculated, the optimum production period was predicted by multiphasic analysis technique. Then, optimal egg production period was calculated via derivative function. Total coefficient of economic efficiency was estimated by integration of calculated mathematical function.
  • Küçük Resim Yok
    Öğe
    Effects of different stocking and lighting regimes on fattening performance and sexual maturity of Japanese quail (Coturnix coturnix japonica) [Japon bildircinlarinda (Coturnix coturnix japonica) farkli yerleşim sikli?i ve aydinlatma programlannin besi performansi ve cinsel olgunluk yaşina etkileri]
    (1996) Yazgan O.; Boztepe S.; Öztürk A.; Parlat S.S.; Da? B.
    The effects of different stocking densities and lighting regimes on fattening performance and sexual maturiy in Japanese quail ae determined. A total of 720 chicks were caged in three separate rooms 9 m2 in size. Twelve treatments consisting of three lighting regimes: 24 (L1). 16 (L2) and 8 (L3) hours light/day, and four stocking densities: 240 (D1), 144 (D2), 103 (D3) and 80 (D4) cm2/bird were applied. The experiment was a completely randomized design with factorial arrangement of treatments. Two replicates of each treatment were used. Performance characteristics were determined at the first day of each week at almost the same time during the five-week experimental period. The time at which 50% of the birds rearched egg and sperm production was accepted as the age at sexual maturity. Avegare live weight of treatment : L1, L2 and L3 were 178.3, 174.6 and 165.5 g and average daily live weight gains were 5.8, 5.6 and 5.3 g. respectively. Average feed efficiency for L1, L2 and L3 were 3.72, 4.05 and 4.00 g, respectively. The same parameters for different stocking rates : D1, D2, D3 and D4 were 4.17, 4.01, 4.02 and 3.50 g, respectively. Age at sexual maturity in L1, L2 and L3 treatments were 27, 31 and 50 days for male qualis and 39, 39 and 62 days for female quails, respectively. Fattening performance and sexual maturity were affected by lighting regimes, but feed efficiency was not affected statistically. Effect of stocking density on feed efficiency was found to be statistically significant, but its effect on sexual maturity was not significant.