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    Effects of Udder Types and Some Environmental Factors on Milk Production of Improved Awassi Sheep
    (KAHRAMANMARAS SUTCU IMAM UNIV, 2017) Kaygisiz, Ali; Dag, Birol
    In this research, the effects of udder types and some environmental factors on milk production of an Elite Awassi sheep flock (n = 1434) raised in Ceylanpinar State Farm were investigated. Udder types were determined according to Epstein's schema. Udder type I, II, III, IV and VI sustained the ratios of 31%, 1%, 42%, 3% and 23%, respectively. The average of total milk yield and lactation period were determined 244.39 +/- 73.04 1 and 173.81 +/- 16.92 days, respectively. Effect of udder types, birth type, birth year and lactation order on lactation milk yield were significant (P< 0.01). Effect of udder types, birth year and lactation order on lactation length were significant (P<0.05, P<0.01). Based on these results, it could be said that significant progress were made in improvement of both milk yield and appropriate udder types of machine milking by subjective selection over the years, but even more progress can be achieved with a selection based yield controls and objective evaluations.
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    Fitness of four different mathematical models to the lactation curve of Brown Swiss cows in Konya Province of Turkey
    (AGRICULTURAL INST CANADA, 2009) Keskin, Ismail; Dag, Birol; Sariyel, Vahdettin
    Keskin, I., Dag, B. and Sariyel, V. 2009. Fitness of four different mathematical models to the lactation curve of Brown Swiss cows in Konya Province of Turkey. Can. J. Anim. Sci. 89: 195-199. The aim of this study was to investigate the fitness of Incomplete Gamma (WD), Exponential (WIL), Mixed Log (MIL) and Polynomial Regression (AS) models to the lactation curve of Brown Swiss Cows. Data were collected from 143 Brown Swiss cows raised on the Altinova State Farm in Konya Province, Turkey. Milk yield was recorded monthly, and milk records were started at the third week of lactation (mean = 16.9 day, SD = 0.7). Total milk yields estimated by the four models were very close to real total milk yield. The models were found to be adequate for estimation of milk yield. The MIL model underestimated the peak yield significantly. The differences between peak yields of the models and real peak yields were not significant and ranged from 27.70 to 29.01 L. All models forecasted peak time earlier than real peak time. The differences for the persistency values of the four models were significant. The AS model's persistency value was nearly equal to the real persistency value (77.56 vs. 77.59%). R-2 values of the models changed from 86.05 to 97.95%. The AS model gave the best R-2 and the least MSPE values. Consequently, the AS model showed the best fit to the lactation data of Brown Swiss cows and allowed a suitable definition of the lactation curve.
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    Investigation of Relationship Amongst Milk and Wool Yield Traits of Awassi Sheep by Using Canonical Correlation Analysis
    (MEDWELL ONLINE, 2009) Keskin, Ismail; Dag, Birol
    This study was carried out to investigate the relationship between milk and wool yield traits of Awassi sheep by using canonical correlation analysis. Data were collected from 108 Awassi sheep maintained at the state farm of Gozlu in Konya Province. The 2 data sets were formed for the analysis. One of the set (X set) was consisted of wool traits that were Fleece Weight (FW), Staple Length (SL), Fibre Length (FL), average number of crimps over a length of 5 cm (ANC) and Wool Fineness (WF) and the other set (Y set) was constituted of Milk Yield (MY), Lactation Period (LP), Milking Period (MP), Average Daily Milk Yield (ADMY) and Maximum Daily Milk Yield (MDMY). The first canonical correlation coefficient between the 2 sets was 0.4473 (p>0.05) and the 2nd was 0.3203 (p>0.05).