Cengiz Yalçin

Estimating the production losses due to cystic echinococcosis in ruminants in Turkey.

The aim of this study was to estimate the production losses due to cystic echinococcosis (CE) in cattle, sheep and goats in Turkey. For this purpose, official records and previously published data in the literature were used. The weighted mean prevalence rates of the disease were calculated to be 7.4% in cattle, 46.3% in sheep and 10.9% in goats. The financial losses were estimated in US

Dynamic programming to investigate financial impacts of mastitis control decisions in milk production systems

at 2008 current prices under expected (mean value), optimistic (mean value lowered by 10%), and pessimistic (mean value increased by 10%) scenarios. The production losses in an infected ruminant were estimated as US

Economic Effect of the Highly Pathogenic Avian Influenza H5N1 Outbreaks Among Turkey Producers, 2005-06, Turkey

139.2 (125.3-153.2, under optimistic-pessimistic scenarios) for cattle, US

Financial effects of the highly pathogenic avian influenza outbreaks on the Turkish broiler producers

13.7 (12.3-15.1) for sheep, and US

The financial impacts of the avian influenza outbreaks on Turkish table egg producers.

13.9 (12.5-15.3) for goats. The nation-wide annual losses due to CE were estimated as US

Economic Impact of the HPAI H5N1 Outbreaks Among Turkey Producers, 2005–06, Turkey

32.4 million (26.2-39.1) for cattle, US

Cost of mastitis in Scottish dairy herds with low and high subclinical mastitis problems.

54.1 million (43.8-65.5) for sheep and US

Production Losses Due to Endemic Foot-and-Mouth Disease in Cattle in Turkey

2.7 million (2.2-3.3) for goats. The nation-wide production losses due to CE in Turkey in 2008 were calculated as US

Estimation of milk yield losses from subclinical mastitis in dairy cows.

89.2 million (72.2-107.9). The results of this study may provide information to assist decisions of the policy makers in prioritising the allocation of scarce resources in controlling animal diseases in Turkey. However, alternative disease control-eradication programmes and cost-benefit analyses of them are needed for the future studies of this kind to provide better decision support in this area.

Producer profiles, production characteristics and mastitis control applications at dairy herds in Konya, Burdur and Kırklareli provinces, Turkey.

An adaptive stochastic dynamic programming model was used to solve the optimum replacement decision problem for the dairy cow under a range of alternative mastitis control procedures. The model predicted that reducing milk yield losses and somatic cell count penalties by, using milking machine test, post-milking teat disinfection and dry cow therapy added approximately pounds sterling 4, pounds sterling 10 and pounds sterling 13 respectively to an original annuity equivalent net present value for the replacement heifer of pounds sterling 286. Assuming that these procedures also reduced involuntary culling due to mastitis by 50% added pounds sterling 8.90 to the annuity. This latter figure indicated that an important part of the benefit of mastitis control procedures might come from a reduction in the culling risk of persistent clinical cases. We concluded that the strength of the dynamic programming model in this context was that it provided an integrated evaluation of the various impacts of each alternative mastitis procedure in the long term, which is essential for correct economic evaluation of mastitis.