Estimation of the Repeatability of Holstein Milk Yields via Various Statistical Methods

This study aims at estimation the repeatability of vital yield characteristics through the Restricted Maximum Likelihood (REML) method by the way of using data with regards to the calving intervals, lactation period, lactation milk yield, dry period and recovered milk yield (2x305 Max.) related to the Holstein herd raised in Ceylanpınar Agriculture Enterprise and comparing the repeatability estimates determined with the help of the REML method, Minimum Quadratic Unbiased Estimation (MQUE), Variance Analysis (VA) and Maximum Likelihood (ML) method. The number of records used for milk yield in the statistical analysis is 1457. The repeatability related to the milk yield characteristics was estimated to be between 0,005 and 0,244. Because of the fact that the repeatability was estimated to be low; it is believed that it might be useful to make the selection based on the mean of two or more records. Estimating the repeatability; the Minimum Quadratic Unbiased Estimation method is most likely to give reliable results for the calving period, dry period and lactation period that meets the r>2Sr condition while REML and ML methods are most likely to give the most reliable results for lactation milk yield and MQUE, VA, REML and ML methods are most likely to give the best results for the adjusted milk yield (2x350 Max.).

Keywords:

Milk yield, repeatability, parameter estimations, restricted maximum likelihood, maximum likelihood minimum quadratic unbiased estimation, variance analysis,

PDF

___

Alim, K.A., (1990). Productive performance of Egyptian cattle in a dairy herd. World Review of Animal production. 25: (1), 67-72.
Alpan, O, Arpacık, R. (1996). Sığır yetiştiriciliği. Şahin Matbaası, Ankara, 1996.
Deshpande, K. S., Deshpande, A. D., Deshpande, K. S. (1992). Studies on lactation length and dry period in Jersey cows. lndian Journal of Dairy Science. 45: (7), 353-355.
Dhumal, M. V., Sakhare, P. G., Deshpande, K. S. (1992). Dry period and service period in Red Kandhari and crossbred cows. lndian Dairyman. 44: (8),377-379.
Ersöz F., Ersöz T., Uygulamalı İstatistik Yöntemler I, Ders kitabı, sy 199, 72 Dijital Basım tasarım, 2017, Ankara.
Evrim, M., Güneş, H. (1995). Hayvan ıslahı ders notları. İstanbul: İstanbul Üniversitesi Veteriner Fakültesi Yayını No:54.
Gandhi, R.S., Gurnani, M. (1992). Repeatability estimates of some the economic traits of Sahiwal cattle over different farms. lndian Journal of Animal Science, 62: (6), 571-573.
Gengler, N, Wiggans, G. R., Wright J. R., Norman,H.D., Wolfe, C. W. (1997). Estimation of (co)variance components for Jersey type traits using a repeatability model. Journal of Dairy Science 80: 1801-1806, AUG 1997.
Goodnight, J. H. (1978). Computing MIVQUEO estimates of variance components.SAS Technical Report R-105, Cary,N.C.: SAS lnstitute.
Jiang, J. (1997). Wald consistency and the method of sieves in REML estimation. The Annals of Statistics, No:4. ,25: 1781-1803.
Khalil, M. H., Afifi, E. A., Salem, M. A. (1992). Evaluation of imported and locally born Friesian cows raised on commercial farms in Egypt. 2. Evaluation of correction factors and of some genetic effects. Egyptian Journal of Animal Production. 29: (1), 43-59
Ledic, 1. L. (1992). An Investigation on milk yield and body weight at first calving in Gir cows. Revista da Sociedade Brasileira de Zootecnia. 21: (5), 815-826.
Lobo, R. (1998). Genetic parameters for reproductive traits of zebu cows in the semi-arid region of Brazil. Livestock Production Science 55: (3), 245-248.
Novy, J. (1992). Population genetics and livestock breeding. Zootechnicka Rada 9: (special issue),40-44.
Patterson, H. D., Thompson, R. (1971). Recovery of inter-block information when block sizes are unequal. Biometrika, 58: 545-554.
Queiroz, S. A.De., Albuquerque, L. G. De., Freitas, M. A. R. De., Lobo R. B. (1991). Genetic and environmental factors affecting the lactation curve in Holstein cows. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia. 43: (4), 357-370.
Rao, G. N., Nagarcenkar, R. (1993). Repeatability estimates for production and efficiency of milk production in crossbred cows. lndian Journal of Dairy Science. 46: (5), 236-237.
Rege, J. E. O., Mosi, R. O. (1989). An analysis of the Kenyan Friesian breed from 1968 to 1994; genetic and environmental trends and related parameters of milk production. Bulletin of Animal Health and Production in Africa. 37; (3), 267-278.
Sharma, A. P., Khan, F. H. (1989). Genetic and non-genetic factors influencing dry period in Sahiwal cows. Indian Veterinary Medical Journal, 13: (3), 172-176.
Singh, S. K., (1992). Factors affecting some milk production efficiency traits in Sahiwal cattle. lndian Journal of Animal Sciences, 62: (4), 346-350.
Skorupski, M. T., Garrick D. J., Blair, H. T. (1996). Estimates of genetic parameters tor production and reproduction traits in tree breeds of pigs. New Zealand Journal of Agricultural Research 39: (3), 387-395.Sep,1996.
Souza, E. M. De., Milagres, J. C., Martinez, M. L., Almeida E Silva, M. De. (1996). Genetic and environmental effects on milk yield in Gir dairy herds. Revista da Sociedade Brasileira de Zootecnia. 25: (5), 889-901.
Wakhungu, J. W., Rege, J. E. O., Itulya, S., (1991). Genetic and phenotypic parameters and trends in production and reproductive performance of the Kenya Sahiwal cattle. Bulletin of Animal Health and Production in Africa.39: (4), 365-37

Gaziosmanpaşa Üniversitesi Ziraat Fakültesi Dergisi-Cover

ISSN: 1300-2910
Yayın Aralığı: Yılda 3 Sayı
Başlangıç: 1985
Yayıncı: Tokat Gaziosmanpaşa Üniversitesi Ziraat Fakültesi Dergisi Yayın Ofisi