Search Result of "Sanao Katkasame"

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Trend Analysis on Milk production Traits in the Dairy Farming Promotion Organization of Thailand)

ผู้เขียน:ImgSanao Katkasame, Imgดร.ศรเทพ ธัมวาสร, ศาสตราจารย์, Imgนายบัณฑิต ธานินทร์ธราธาร, อาจารย์, ImgSomkiert Pasanpanich



A total of 976 first lactation records from Dairy Farming Promotion Organization of Thailand during the years 1972 to 1991 were used to evaluate phenotypic trend and genetic trend on sire contributions. All records were analyzed to obtain the solutions from solving the fixed and mixed model equations. Year of sire birth was considered to provide genetic grouping based on sire contributions. By regressing year of calf solutions on time, estimates of phenotypic changes were obtained. Genetic trend based on sire contribution were obtained by regressing year of sire birth solution on time. The phenotypic trends per year on milk yield, milk fat and fat percentage were found to be 35.98 kg, 1.2589 kg and -0.0104%, respectively. Genetic trend based on sire contribution for three traits were 45.05 kg, 0.448 kg and -0.0544% per year, respectively.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 030, Issue 2, Apr 96 - Jun 96, Page 211 - 219 |  PDF |  Page