Yazar "Tekin M.E." seçeneğine göre listele

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    Estimation of factors for standardizing lactation yield to mature equivalent and 305-day basis for Brown Swiss cattle reared at Ulaş State Farm
    (2006) Çilek S.; Tekin M.E.
    In this study, adjustment factors of lactation milk yield to mature age and 305 days were estimated for Brown Swiss cattle from 3 013 lactation records. Factors for adjusting the incomplete lactation to 305 days were calculated separately for 7 calving age groups, and the average of adjustment factors were also estimated for all the ages. For lactations less than 305 days, average of adjustment factors for 30th, 60th, 90th, 120th, 150th, 180th, 210th, 240th, 270th, 300th and 305th days, were 7.88, 4.01, 2.66, 2.04, 1.67, 1.43, 1.25, 1.16, 1.08, 1.01 and 1.00 respectively. For lactations more than 305 days, the average of adjustment factors for 310th, 340th, 370th, 400th, 430th, 460th, 490th, 520th, 550th, 580th and 600th days were 0.98, 0.93, 0.88, 0.84, 0.80, 0.76, 0.73, 0.70, 0.67, 0.65 and 0.64 respectively. Adjustment factors for mature age were calculated by using polynomial regression. Adjustment factors were estimated as 1.13 and 1.20 for cows calving in 24th month and for cows calving in 143rd month, respectively, with mature age from 67 to 89 month.
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    Estimation of heritability and repeatability of milk yield of Brown Swiss cattle reared in Ulaş State Farm
    (2006) Çilek S.; Tekin M.E.
    In this study, heritability and repeatability of milk yield were estimated for Brown Swiss cattle. From 2 652 lactations, repeatability of milk yield was estimated as 0.52±0.02. Heritability of milk yield for all lactations was estimated as 0.24±0.05 from 2 820 lactation records. It was concluded that both the repeatability and the heritability were at expected levels and these results can be used for selecting and culling of the cattle in this farm.
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    The use of BLUP method in ram selection
    (KAFKAS UNIVERSITY, 2009) Karabulut O.; Tekin M.E.
    This study was carried out to estimate breeding values of Konya Merino lambs for weaning weights by using BLUP (Best Linear Unbiased Prediction) method. Records (n=1167) collected between the years 1997-2002 from Konya Merino Lambs reared at the Farm of Konya Animal Research Institute was used by Animal Model of BLUP Method for estimating breeding value of each animal. Dam age, sex, birth type and year were taken into account as fixed effects for weaning weight. Birth weight was included into the analyses as a covariate. Heritabilities included in analysis were estimated by using six different models of REML technique. Heritabilities estimated through six different models were 0.33, 0.12, 0.07, 0.22, 0.06 and 0.19. Based on the predicted breeding values by using BLUP method, the best ten lambs were recommended to the institute as breeding rams. As a result; BLUP, the most reliable method for predicting the breeding values, can be used at the farms recording with pedigree.