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Full-Text Articles in Life Sciences
Investigation Of Three Different Lactation Models In Milk Yields Of Holstein Cows, Mehmet Nurullah Orman, Okan Ertuğrul
Investigation Of Three Different Lactation Models In Milk Yields Of Holstein Cows, Mehmet Nurullah Orman, Okan Ertuğrul
Turkish Journal of Veterinary & Animal Sciences
The purpose of this study was to determine the best lactation curve. Data were collected from the dairy cattle breeding unit at Ceylanpinar State Farm. Three different lactation curve models (Wood, Schaeffer, Glasbey) were applied to all data. The values of the determination coefficients of three lactation curve models were estimated at 70.62-79.47%. Some negative estimated values were obtained during the estimation of parameters. These results were restricted by the hypothesis and were tested. All restrictions were accepted. Total actual and mature equivalent (ME, 2x3057) milk yields were estimated. Differences between the actual values of lactation milk yield, and the …
Estimation Of Heritability Of Milk Yield Through Analysis Of Variance In A Repeated Measures Design In Holsteins, İsmet Doğan, Mahi̇ye Özçeli̇k, Nurhan Doğan
Estimation Of Heritability Of Milk Yield Through Analysis Of Variance In A Repeated Measures Design In Holsteins, İsmet Doğan, Mahi̇ye Özçeli̇k, Nurhan Doğan
Turkish Journal of Veterinary & Animal Sciences
In this study, data relating to the milk yield of a Holstein herd on Bala State Farm was analysed for the period 1985-92. The aim of this study was to estimate the heritability of the milk yield using two-factor experiments with repeated measures on one factor. The heritability of the milk yield was estimated to be 0.36.
Growth Analysis Of Brown Swiss And Holstein Heifers Under Harsh Climatic Conditions, Ömer Akbulut
Growth Analysis Of Brown Swiss And Holstein Heifers Under Harsh Climatic Conditions, Ömer Akbulut
Turkish Journal of Veterinary & Animal Sciences
Monthly live weights and heights at withers of Brown Swiss and Holstein heifers were compared in the period from birth to 18 months of age between 1991 and 1994. This study was carried out under harsh climatic conditions of Erzurum, situated in North-Eastern Anatolia with an altitude of 1950 m. During the experimental period annual mean temperature was 4.3 °C and minimum and maximum average monthly temperatures being -17 °C and 19.5 °C respectively. Total annual rainfall was 389 mm, and average humidity was 68.4 %. Feeding systems were based on medium quality roughage consisted of dry hay (grass, alfalfa …
Heritability Estimation Of Milk Production Of Cows Of Different Origin And Breed In Karacabey State Farm, İsmet Doğan, Okan Ertuğrul
Heritability Estimation Of Milk Production Of Cows Of Different Origin And Breed In Karacabey State Farm, İsmet Doğan, Okan Ertuğrul
Turkish Journal of Veterinary & Animal Sciences
The objective of this study was to estimate heritability (h^2), a useful criterion, in the improvement studies which would be conducted to improve milk productivity in the Karacabey State Farm. A total of 760 cows, of which milk yield records were used in the study in different lactation period, consisted of 111 American Browns , 142 American Holsteins , 87 German Browns , 130 Swiss Browns , 83 Holland Holsteins and 207 Karacabey Browns. Milk yields were corrected according to the 2x305ME standardisation procedure. Furthermore, coefficients of relationship were calculated separately for Brown and Holstein cows using the pedigree cards …
The Genetic And Phenotypic Correlations Between Milk And Reproductive Traits In Holstein Cows, Mahi̇ye Özçeli̇k, İsmet Doğan
The Genetic And Phenotypic Correlations Between Milk And Reproductive Traits In Holstein Cows, Mahi̇ye Özçeli̇k, İsmet Doğan
Turkish Journal of Veterinary & Animal Sciences
In this study, the genetic and phenotypic correlations between milk production traits (milk yield, lactation duration, dry period) and reproductive traits (the number of inseminations per conception, service period, calving interval and gestation period) in Holstein Cows were investigated. The data relating to milk and reproductive traits in the period of 1985-1992 of a Holstein herd at the Bala State Farm was used. The genetic correlations were generally higher than phenotypic correlations between traits investigated in this study. In milk production traits, the phenotypic correlations between the milk yield and the lactation duration (0.41) and the dry period (-0.14) were …