Calculation of Adjustment Factors for Standardizing Lactations to Mature Age and 305-Day and Estimation of Heritability and Repeatability of Standardized Milk Yield of Simmental Cattle Reared on Kazova State Farm

Adjustment factors of lactation milk yield to mature age and 305-day were calculated and heritability and repeatability of milk yield were estimated for Simmental cows reared on Kazova State Farm. A total of 1549 lactation records of Simmental cows reared on Kazova State Farm between 1992 and 2002 were used. The factors for standardizing incomplete lactations to 305-day were estimated by taking 7 calving age groups into consideration (2, 3, 4, 5, 6-8, 9 and 10 years of age and older). The factors for standardizing to mature equivalent estimated by polynomial regression are between the 24th and 143rd month and older. The repeatability of milk yield was estimated as 0.44 ± 0.028 using intra- class correlation. Heritability of milk yield was estimated using paternal half-sib correlation. Heritability of milk yield for all lactations was estimated as 0.24 ± 0.08. Heritability for first lactation was estimated as 0.30 ± 0.154.

Calculation of Adjustment Factors for Standardizing Lactations to Mature Age and 305-Day and Estimation of Heritability and Repeatability of Standardized Milk Yield of Simmental Cattle Reared on Kazova State Farm

Adjustment factors of lactation milk yield to mature age and 305-day were calculated and heritability and repeatability of milk yield were estimated for Simmental cows reared on Kazova State Farm. A total of 1549 lactation records of Simmental cows reared on Kazova State Farm between 1992 and 2002 were used. The factors for standardizing incomplete lactations to 305-day were estimated by taking 7 calving age groups into consideration (2, 3, 4, 5, 6-8, 9 and 10 years of age and older). The factors for standardizing to mature equivalent estimated by polynomial regression are between the 24th and 143rd month and older. The repeatability of milk yield was estimated as 0.44 ± 0.028 using intra- class correlation. Heritability of milk yield was estimated using paternal half-sib correlation. Heritability of milk yield for all lactations was estimated as 0.24 ± 0.08. Heritability for first lactation was estimated as 0.30 ± 0.154.

___

  • Kaygısız, A.: Siyah Alaca sığırların Kahramanmarafl Tarım
  • İflletmesi flartlarında verim özellikleri. Tarım Bilim Derg., 1997; 3: 9-22.
  • Klopcic, M., Moning, E.S., Pagacar, J.: Environmental effects and heritability estimation for milk traits at test days in the Slovenian Brown, Simmental and Black and White cattle population. Stocarstvo, 1997; 51: 421-426.
  • fiekerden, Ö., Erdem, H.: Kazova Tarım İflletmesinde yetifltirilen Simental sığırlarinda süt ve döl verim özellikleri ile bazı parametrelerin tahmini üzerine bir arafltırma. Ondukuz Mayıs Üniv. Zir. Fak. Derg., 1995; 10: 63-72.
  • Erdem, H.: Gökhöyük Tarım İflletmesinde yetifltirilen Siyah Alaca sığırların süt ve döl verim özellikleri ve bu özelliklere ait bazı parametrelerin tahmini üzerine bir arafltırma. Doktora Tezi. Ondokuz Mayıs Üniv. Fen Bil. Ens., Samsun. 1997; pp. 90-92.
  • Kaps, M., Posavi, M.: Estimation of the variance components for milk traits of Holstein Friesian cows in Croatia by Henderson method 3 and REML. Anim. Breed. Abstr., 1992; 60: 632.
  • Swalve, H.H.: The effect of test day models on the estimation of genetic parameters and breeding values for dairy yield traits. J. Dairy Sci., 1995; 78: 929-938.
  • Düzgünefl, O., Eliçin, A., Akman, N.: Hayvan ıslahı. Ankara Üniv. Zir. Fak. Yayınları, No: 1437, Ankara. 1996; 226-227.
Turkish Journal of Veterinary and Animal Sciences-Cover
  • ISSN: 1300-0128
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK
Sayıdaki Diğer Makaleler

Secundum atrial septal in a one-year-old Kangal dog

İlker ARICAN, Bestami YILMAZ, M. Özgür ÖZYİĞİT, Gülsüm ÖZYİĞİT

Morphometric Analysis of the Sternum in Avian Species

Ayhan DÜZLER, Özcan ÖZGEL, Nejdet DURSUN

Calculation of adjustment factors for standardizing lactations to mature age and 305-day estimation of heritability and repeatability of standardized milk yield of Simmental cattle reared on Kazova State Farm

Mehmet Emin TEKİN, Süleyman ÇİLEK

Calculation of Adjustment Factors for Standardizing Lactations to Mature Age and 305-Day and Estimation of Heritability and Repeatability of Standardized Milk Yield of Simmental Cattle Reared on Kazova State Farm

Süleyman ÇİLEK, Mehmet Emin TEKİN

Identification of Vibrio anguillarum by PCR (rpoN Gene) Associated with Vibriosis in Marine Fish in Turkey

Didem DEMİRCAN, Akın CANDAN

Effect of Astragalus and Astragalus Polysaccharide on Antimicrobial Peptides PR-39 and Protegrin-1 Gene Expression in Pigs

Youjin TU, Chunlan XU, Yizhen WANG, Guojia YAO, Tizhong SHAN

Secundum Atrial Septal Defect in a One-Year-Old Kangal Dog

Gülsüm ÖZYİĞİT, İlker ARICAN, M. Özgür ÖZYİĞİT, Bestami YILMAZ

Growth Performance and Metabolic Profile of Chios Lambs Prevented from Colostrum Intake and Artificially Reared on a Calf Milk Replacer

Kemal ÖZTABAK, Aysel ÖZPINAR

Effects of hybrid type, stage of maturity, and fermentation length on whole plant corn silage quality

Mehmet Ali BAL

Serological and Virological Investigations of Bovine Viral Diarrhoea Virus (BVDV) Infection in Dairy Cattle Herds in Aydın Province

M. Tolga TAN, M. Taner KARAOĞLU, Nural EROL, Yakup YILDIRIM