SUMMARY
Application of Best Linear Unbiased Prediction Method To Estimate Breeding Value of Milk Yield for Holstein Herds in Karacabey and Tahirova State Farms.
This study was conducted to estimate the genetic parameters and breeding values of milk yield for Holstein cows, which have lactation records between 1997-2002, with BLUP in Karacabey and Tahirova State Farms.
Ancestors and animal records were obtained from pedigree files held in farms. Breeding values were estimated according to 2×305 day milk yield records of 1004 cow with 1899 lactation. The factors, calving year, calving season, calving age, calving month, parity and herd, are examined as effecting 2×305 day milk yield. Genetic parameters and breeding values were estimated with MTDFREML.
The heritability and repeatability of milk yield were estimated as 0. 13 and 0.44 for Karacabey State Farm, 0.29 and 0.41 for Tahirova State Farm and 0.15 and 0.43 for Karacabey and Tahirova State farms together, respectively.
Total genetic gain, annual genetic gain and mean breeding value were estimated 59.2 kg and 1.2 kg/year and 78.511.7 kg for Karacabey State Farm, 83.5 kg and 40.5 kg/year and 48.333.5 kg for Tahirova State Fann, 88.2 kg, 1.8 kg/year and 70.612.3 kg for Karacabey and Tahirova State farms together, respectively.
In according to the estimated breeding values for Holsteins in Karacabey and Tahirova State farms separately and together, milk yield has positive genetic trend but it was determined. that there is a fluctuation between one after another year. The reason of this is, selection of heifers, culling of cows and the bulls which are used for artificial insemination in these state farms are not selected according to the breeding values and it was determined. that selection and culling is made only according to the phenotypic records. As a conclusion estimation ofbreeding values with Best Linear Unbiased Prediction method and selecting and culling according to these breeding values with a tidy record keeping might help to increase genetic gain in these herds.
Key Words: Genetic Parameters, Breeding Value, BLUP, Holstein, Milk Yield.
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ABSTRACT PhD THESIS PREDICTION OF GENETIC PARAMETERS RELATED TO MILK YIELDS OF BOLSTEIN FRIESIAN POPULATION REARED iN THE CEYLANPINAR AGRICULTURAL STATE FARM BY BAYESIAN AND REML METHODS ADNAN ÜNALAN DEPARTMENT OF ANIMAL SCIENCE INSTITUTE OF NATURAL AND APPLIED SCIENCES UNIVERSITY OF ÇUKUROVA Supervisor Jury : Prof. Dr. Zeynel Cebeci Year: 2002, Pages: 126 : Prof. Dr. Zeynel Cebec...
Ceylanpınar Tarım İşletmesi'nde yetiştirilen siyah alaca sığırlarda kısmi süt verimlerinden yararlanılarak 305 günlük süt verimini tahmin etme imkanları - Sayfa 6
ABSTRACT AliACIKGÖZ UNIVERSITY OF KAHRAMANMARAŞ SÜTÇÜ İMAM INSTITUTE OF NATURAL AND APPLIED SCIENCES DEPARTMENT OF ANIMAL SCIENCE MScTHESIS ABSTRACT ESTIMATION OF 305 DAYS MILK YIELD USING PARTIAL MILK YIELD iN HOLSTEIN CATTLE RAISED CEYLANPINAR STATE FARM. Ali AÇIKGÖZ Supervisor: Asist. Prof. Dr. Ali KAYGISIZ Year: 2003, Pages: 70 Jury: Assist. Prof. Dr. Ali KAYGISIZ : Assoc. Pro...
Süt sığırlarında döl verim özelliklerine ait damızlık değerleri tahminlemesi - Sayfa 7
vii ABSTRACT ESTIMATION OF BREEDING VALUES FOR DAIRY CATTLE USING REPRODUCTIVE TRAITS GÖL, Ayşegül MSc in Animal Science Supervisor: Prof. Dr. Yavuz AKBAŞ January 2013, 56 pages In this study, breeding values for reproductive traits and 305 day milk yield of Holstein Friesian dairy cattle, were estimated. The age at first calving and calving interval as reproductive traits were examined. Breed...

6. SAYFADAKI ANAHTAR KELIMELER

yield
milk
were
holstein
calving
lactation


6. SAYFA ICERIGI

SUMMARY
Application of Best Linear Unbiased Prediction Method To Estimate Breeding Value of Milk Yield for Holstein Herds in Karacabey and Tahirova State Farms.
This study was conducted to estimate the genetic parameters and breeding values of milk yield for Holstein cows, which have lactation records between 1997-2002, with BLUP in Karacabey and Tahirova State Farms.
Ancestors and animal records were obtained from pedigree files held in farms. Breeding values were estimated according to 2×305 day milk yield records of 1004 cow with 1899 lactation. The factors, calving year, calving season, calving age, calving month, parity and herd, are examined as effecting 2×305 day milk yield. Genetic parameters and breeding values were estimated with MTDFREML.
The heritability and repeatability of milk yield were estimated as 0. 13 and 0.44 for Karacabey State Farm, 0.29 and 0.41 for Tahirova State Farm and 0.15 and 0.43 for Karacabey and Tahirova State farms together, respectively.
Total genetic gain, annual genetic gain and mean breeding value were estimated 59.2 kg and 1.2 kg/year and 78.511.7 kg for Karacabey State Farm, 83.5 kg and 40.5 kg/year and 48.333.5 kg for Tahirova State Fann, 88.2 kg, 1.8 kg/year and 70.612.3 kg for Karacabey and Tahirova State farms together, respectively.
In according to the estimated breeding values for Holsteins in Karacabey and Tahirova State farms separately and together, milk yield has positive genetic trend but it was determined. that there is a fluctuation between one after another year. The reason of this is, selection of heifers, culling of cows and the bulls which are used for artificial insemination in these state farms are not selected according to the breeding values and it was determined. that selection and culling is made only according to the phenotypic records. As a conclusion estimation ofbreeding values with Best Linear Unbiased Prediction method and selecting and culling according to these breeding values with a tidy record keeping might help to increase genetic gain in these herds.
Key Words: Genetic Parameters, Breeding Value, BLUP, Holstein, Milk Yield.
m

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