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Öğe Anadolu Merinosu Erkek Kuzularında Besi Dönemi Vücut Ölçülerine Ait Ortalamalardan Canlı Ağırlık, Canlı Ağırlık Artışı ve Yem Tüketiminin Tahmini(Selçuk Üniversitesi, 2018) Şahin, Özcan; Boztepe, Saim; Keskin, İsmailBu çalışmada Anadolu Merinosu erkek kuzularında besi dönemi vücutölçülerine (cidago yüksekliği, sağrı yüksekliği, göğüs çevresi, göğüsderinliği, vücut uzunluğu, but çevresi) ait ortalamalardan canlı ağırlık,canlı ağırlık artışı ve yem tüketimlerinin regresyon analizi yardımıylatahmin edilmesi amaçlanmıştır. Canlı ağırlık ve vücut ölçüleri arasındaki korelasyonlar 0.674 ile 0.788 arasında değişmiş ve istatistik olarakönemli bulunmuştur (p<0.01). Canlı ağırlık artışı ile sadece canlı ağırlık arasında önemli (p<0.05) ilişki bulunurken, yem tüketimi ile cidagoyüksekliği, sağrı yüksekliği, göğüs derinliği ve canlı ağırlık arasında(p<0.01), vücut uzunluğu ve but çevresi arasında (p<0.05) önemlikorelasyonlar tespit edilmiştir. Besi sonu canlı ağırlığı ile göğüs çevresiarasında yüksek ve istatistik olarak önemli ilişki bulunması nedeniyle,vücut ölçülerinden sadece göğüs çevresi kullanılarak canlı ağırlıkCA=-51.8+1.04GÇ şeklinde tahmin edilmiştir. Bu denkleme ait belirleme katsayısı % 61.8 (p<0.01) olarak tespit edilmiştir.Öğe An Application of Fuzzy Pearson Correlation Methods in Animal Sciences(Selçuk Üniversitesi, 2021) Topuz, Derviş; Keskin, İsmailHow to evaluate an appropriate correlation to find the fuzzy relationship between variables is an important topic in the lactation milk yield and reproduction characteristics measurement. Especially when the data illustrate uncertain, inconsistent and incomplete type, fuzzy statistical technique has some theoric features that help resolving unclear thinking in human logic and the source of uncertainties in the natural structure of the data. Traditionally, we use Pearson’s Correlation Coefficient to measure the correlation between data with real value. However, when the data are composed of fuzzy numbers, it is not feasible to use such a traditional approach to determine the fuzzy correlation coefficient. This study proposes the calculation of fuzzy correlation with triangular of fuzzy data. Using Matlab application, fuzzy Pearson correlation coefficients and their membership degrees which belong to Holstein Friesian cows for the relationship between lactation milk yield, the age of the animal at lactation, number of days milked, service period and first calving age were calculated (- 0.0056; 0.95), (0.1419; 0.98), (-0.272;1.0) and (-0.2543; 0.90) respectively. The membership degrees of the calculated fuzzy Pearson coefficient values are more reliable and a consistent coefficient since it determines the size of the relationship between the sets, which belong to variables. As a result of the study, the fuzzy Pearson correlation coefficient analysis may be preferred to calculate the degree of uncertainty and membership degrees between variables that should be used in studies to increase lactation milk yield.Öğe Bazı bakla (Vicia faba L.) genotiplerinde tane verimi ve verime etki eden özellikler arasındaki iliskilerin belirlenmesi(2011) Karadavut, Ufuk; Kayıs, Seyit Ali; Keskin, İsmailBu çalısma 4 farklı bakla genotipinin (Eresen-87, 69V1, Etae-77 ve Etae-339) verim ve verime etki eden bazı özelliklerin verim ile olan iliskilerinin ve bu karakterlerin verim üzerine doğrudan ve dolaylı etkilerini belirlemek için yapılmıstır. Çalısmada 69V1, Etae-77 ve Etae-339 genotiplerinde incelenen verime etkili karakterler ile verim arasında önemli bir iliskinin olmadığı görülmüstür (P0.05). Eresen 87 genotipinde ise bitki boyu ile verim arasında istatistik olarak önemli bir iliski bulunduğu tespit edilmistir (P0.01). Ayrıca bitki boyu ile baklada tane ağırlığı ve bitkide bakla ağırlığı ile bitkide tane ağırlığı arasında istatistiksel olarak önemli pozitif korelasyonlar tespit edilmistir (P0.01). Bu genotipte bitki boyu ve bitkide bakla ağırlığı arttıkça bakladaki tane ağırlıkları da artıs göstermistir.Öğe Biometry of Testicular Growth in Konya Merino, Akkaraman and Awassi Ram Lambs(Indian Counc Agricultural Res, 2002) Öztürk, Ayhan; Dağ, Birol; Keskin, İsmail; Aktaş, Ahmet HamdiIn this research testicular development of Konya Merino (KM). Akkaraman (AK) and Awassi (AW) ram lambs x as investigated for the period of 3-14 months. Diameter (TD) and length (TL) and scrotal circumference (SC) of testis were evaluated. Least square means at 3 months of age for KM. AK and AW breeds, respectively, were determined as 1.72. 1.86 and 1.87 cm for TD. 4.17, 4.18 and 4.47 cm for TL and 9,77, 9.38 and 10.22 cm for SC. Developments of TD, TL and SC for KM. AK and AW were 167.44%, 145.16% and 167.91%; 144.12%. 132.30% and 143.40%: 185.87%. 183.58% and 188.55% respectively. Differences between the averages of breeds for TD. TL and SC were significant (P < 0.01). Correlation coefficients between all traits were statistically significant (P < 0.01).Öğe Comparison of Different Mathematical Models for Describing the Complete Lactation of Akkaraman Ewes in Turkey(Asian-Australasian Assoc Animal Production Societies, 2006) Keskin, İsmail; Dağ, BirolThis study was carried out to investigate the use of three different mathematical models (Wood, Quadratic and Cubic) for describing the lactation curve of Akkaraman ewes. Data were collected from 42 ewes that were three years of age and from the same flock raised in The State Farm of Gozlu in konya Province. All-ewes lambed. in March. They were hand milked twice daily and the first milk test was performed with in the first month after lambing (mean = 27.8 day, SD = 4.26) in an attempt to describe the peak yield. The differences between estimated total milk yields by the models were not significant. The models were adequate for describing total milk yield. The differences between peak yields were not significant. The Wood model estimated the time of peak yield earlier than the other models and observed values (p < 0.01). Especially the Cubic model's peak time was very close to really peak time (34.30 vs. 35.33 days). R 2 values of the models ranged from 85.85% to 96.20%. The Cubic model gave the best R-2 value (p < 0.01). Correlation coefficients between descriptive values of the models changed from 0.32 to 1.00. Total milk yields of the models were highly correlated (above 0.99) with the total milk yield calculated by the Fleischmann method (p < 0.01). As a result the Cubic model showed the best fit to the data collected from Akkaraman ewes and allowed a suitable description of the shape of the lactation curve.Öğe Determination of Factors Affecting Mastitis in Holstein Friesian and Brown Swiss by Using Logistic Regression Analysis(Selçuk Üniversitesi, 2019) Altay, Fatih; Kılıç, Büşra; Aytekin, İbrahim; Keskin, İsmailThe aim of this study was to determine subclinical mastitis with the help of logistic regression of milk quality determined factors and some features the research material consisted of 204 (145 Holstein, 59 Brown Swiss) dairy cattle raised in a private cattle farm in Konya Province, Turkey. The independent variables considered for the detection of subclinical mastitis are breed, somatic cell number (SCC), color values (L, a, b, H, C), freezing point (FP), pH, electrical conductivity (EC), milking day (MD), lactation order (LO). The dependent variable of logistic regression was CMT score. According to the results of the study, the spescifity was 95.7% and the sensitivity was 57.6%. In general, the predicted value of the accuracy of all data was 83.3%.Öğe Determination of Natural Risk Sources Effective in Wheat Production in Hadim District with the Help of Linear Programming(Selçuk Üniversitesi, 2021) Altay, Yasin; Keskin, İsmailThere are many sources of natural risks affecting wheat cultivation. In this study, it is aimed to estimate the minimum and maximum risk ranges and premium and compensation amounts of the natural risk factors affecting the wheat yield in Hadim district of Konya in terms of farmers and insurance.As natural risk factors, disease and pests, frost, drought, hail, fire and the interactions of other risks and factors were examined.The number of factors dealt with in the study is 6, and the total number of linear models created using all combinations is 63.The 63 linear models established, the minimum and maximum risk ranges in terms of farmers and insurance were determined by using the simplex method of linear programming on the basis of yield and price.In addition, diseases and pests and other risk factors not included in the scope of agricultural insurances were included in the linear models and wheat yield was estimated on district basis.In the model with all risk factors, the expected risk value of the farmer is 64.962 (kg / ha-1) -71.588 (TL / ha-1), while it is estimated as 53.548 (kg / ha-1) -59.009 (TL / ha-1) in terms of insurance. has been. As a result, it was estimated that the farmer paid 20,831 (TL / ha-1) premiums and 122,344 (TL / ha-1), while insurance companies paid 59,009 (TL / ha-1) premium 84,018 (TL / ha-1) compensation.Öğe Examination of Milk Samples, Obtained from the Different Cattle Breeds in the First Lactation, by Means of Discriminant Analysis(Selçuk Üniversitesi, 2022) Işık, Mümine; Keskin, İsmailBy means of discriminant analysis, it can be identified which class the individuals (data) desired to be classified. In this study, it was aimed to identify that the milk samples belong to which breed, applying discriminant analysis to the milk samples taken from the cattle breeds (19 heads of Jersey, 53 heads of Holstein and 27 heads of Charolaise) in the first lactation. As a conclusion of the study, proper classification actualized in the rate, which can be considered quite high like 90.6%, according to the milk components (fat, protein, lactose, density, pH and conductivity) of Holstein Cattles. This rate actualized as 63.2% in Jersey and 25.9% in Charolaise. It was identified that the rate of general classification of non-linear analysis, used in discriminating Holstein, Jersey and Charolaise breeds from their milk components, was 67.7%.Öğe The Identification of Genetic Variation in Insulin-Like Growth Factors-I (IGFI) Gene Region in Some Turkish Sheep Breeds(Selçuk Üniversitesi, 2020) Tawfeeq, Mustafa; Keskin, İsmail; İlhan, FatmaInsulin-like growth factors (IGFs) areknown as peptides with important metabolic effects required for cellular growth and metabolism. IGF-I is synthesized in liver tissue under the control of growth hormone (GH) and released to blood. In the process of GH to accelerate growth, IGF-I occupies a large place. IGF-I clearly showed its important effects on the growth of animal studies. In this study, promoter region of the IGF-I gene were amplified by polymerase chain reaction (PCR) in sheep breeds (Akkaraman, Kivircik, Awassi, Sakiz, Daglıc, Morkaraman, MalyaKarayaka (15 to 20 sheep per breed)) reared in Turkey. Informative restriction fragment length polymorphisms (RFLPs) were obtained with HaeII enzyme. The digestion of IGF-I gene with HaeII produced two alleles and three genotypes. Genotype frequencies were 59%, 19%and 22% for AA, BB and AB genotypes, respectively. Allele frequencies were 0.70 for A allele and 0.30 for the B allele. This study indicates the genetic profiles of the IGF-1 gene in native Turkish sheep breeds.Öğe Identifying Preferences of Red Meat Consumption by Means of Conjoint Analysis(Selçuk Üniversitesi, 2021) Özüak, Aykut; Keskin, İsmailIn this study, in order to identify the preferences of red meat consumption in Konya, conjoint analysis was used, which has been quite commonly used in product production and existing market studies. Preference cards used in the study were applied to 201 people. People were asked to put in order preference cards by coding as “1” the mostpreferrable toward they prefer the least, and the full profile method is used. Kendall’s Tau value stating representation power of the model was identified as 0.974 and Pearson's R, as 0.993. At the end of the study, it was seen that the factors affecting red meat preferences and purchasing behaviors of the people living in Konya were purchasing place (46.5%), sort of meat (17.7%), purchasing way (13.0%), fat rate of the meat purchased (12.9%) and, finally, meat price. As a result, it was expressed that conjoint analysis would help about which changes businesses could make in their products or services, which points they had to be dealt with product development studies, and in what direction the existing and potential customers in market could react.Öğe İneklerde bulanık mantık modeli ile hareketlilik ölçüsünden yararlanılarak kızgınlığın tespiti(2011) Memmedova, Nazire; Keskin, İsmailBu çalışmada, hareket özelliği (zayıf, orta ve yüksek), ineğin hareketli olup olmaması (az hareketli, orta hareketli ve çok hareketli) ve son kızgınlıktan sonra geçen süre (kısa, normal, normalden uzun ve uzun) özellikleri bulanık mantık modeli ile birlikte kullanılarak kızgınlığın teşhisinin doğru bir şekilde tespit edilmesi amaçlanmıştır. Çalışmanın hayvan materyalini özel bir işletmede yetiştirilen farklı yaşlardaki 117 baş siyah alaca ırkı inek oluşturmuştur. Hareket özelliği (HÖ) her bir ineğin ön sol ayağına bağlanmış olan pedometre ile ölçülmüştür. Son kızgınlıktan sonra geçen süre (SKSGS) parametresi ise önceki tohumlamalar ve kızgınlıklar hakkındaki bilgileri de içermektedir. İnek tipi (İT) olarak adlandırılan, ineğin hareketli olup olmamasına göre kesin bir giriş verisi de kullanılmıştır. Çalışma sonucunda, bulanık mantık sistemi kullanıldığında kızgınlıkta olan ineklerin %98.0 gibi oldukça yüksek sayılabilecek bir oranda tespit edildiği belirtilmiştir.Öğe Japon bıldırcınlarında (coturnix coturnix japonica) büyüme eğrilerinin genetik analizi(Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 1999-09-09) Keskin, İsmail; Tozluca, AbdurrahmanBu çalışma, bıldırcınlarda büyüme eğrilerini belirlemek, doğrusal olmayan büyüme modellerinden Gompertz modelinin bıldırcın verilerine uyumunu karşılaştırmak, büyüme eğrisi parametrelerini ve bu parametreler arasındaki genetik ve fenotipik korelasyonları tespit etmek amacıyla yapılmıştır. Büyüme eğrisi parametreleri (W, fi ve y) tüm sürü için sırasıyla 198.37±1.0220, 4.195±0.0204 ve 0.0813±0.0004 olarak tespit edilmiştir. Yaşa bağlı olarak canlı ağırlıkların değişimini büyüme eğrisi parametreleri ile özetleyen Gompertz modeli, bıldırcın verilerine oldukça iyi uyum göstermiştir. Determinasyon katsayıları erkek, dişi ve tüm sürü için sırasıyla; % 99.86, % 99.70 ve % 99.81 olarak bulunmuştur. Büyüme eğrisi parametreleri için genel olarak orta ve yüksek kalıtım dereceleri tahmin edilmiştir. Bunun yanında büyüme eğrisi parametreleri ve eğri parametreleriyle muhtelif yaşlardaki canlı ağırlıklar arasında genel olarak yüksek fenotipik ve genetik korelasyonlar tespit edilmiştir. Sonuçlar, büyüme eğrisi parametrelerinin Japon bıldırcınlarında canlı ağırlığın geliştirilmesine yönelik çalışmalarda seleksiyon kriteri olarak kullanılabileceğini göstermektedir.Öğe Japon Bıldırcınlarında (Coturnix Japonica) Büyüme Eğrisi Parametrelerinin Yanlılığı(2002) Keskin, İsmail; Tozluca, Abdurrahman; Genç, AşırBu çalışma, Japon bıldırcınlarında (Coturnix japonica) EKK, Jackknife, Bootstrap ve OAGD tahmin edicileri kullanılarak yanı en az olan büyüme eğrisi parametresini belirlemek amacıyla yapılmıştır. Tüm sürüye ait hata kareler ortalamaları EKK için 7.555, Jackknife için 7.099, Bootstrap için 7.282 ve OAGD için 7.099 olarak tespit edilmiştir. Tüm sürü için belirleme katsayıları (R2) ise sırasıyla; % 99.137, % 99.837, % 99.902 ve % 99.897 olarak bulunmuştur.Öğe Melatonin Differences Between Day and Night Milk in Primiparous Holstein Friesian and Jersey Dairy Cattle(Selçuk Üniversitesi, 2022) Boztepe, Saim; Keskin, İsmail; Semacan, Ahmet; Akyürek, Fikret; Aytekin, İbrahim; Şahin, ÖzcanThis study was conducted to determine the levels of melatonin in the day and night milk of Holstein and Jersey cows. In the study, samples of daytime milk produced from 27 head of Holstein and 27 head of Jersey cows in the first lactation, which were raised in a private dairy cattle enterprise in the Kaşınhanı neighborhood of Meram district of Konya city Turkey, and night milk samples taken from the same cows that were blackened for one (1) week were used. Melatonin levels in milk samples taken from day and night milk were determined separately for Holstein and Jersey cows with the help of Bovine Melatonin (MLT) Elisa Kit. In the study, it was determined that the ratio of melatonin in day and night milk in Holstein cows was 2.912 pg/ml and 11.314 pg/ml, respectively, and the ratio of melatonin in Jersey cows was 2.924 pg/ml and 6.954 pg/ml in the same order. The difference between the melatonin levels of the day and night milk of Holstein and Jersey cows was found to be statistically significant (p<0.01). At the end of the study, it can be stated that night milk can be used for medical purposes and a new production source may arise for producers since there is a significant difference in melatonin between day and night milk.Öğe Polatlı tarım işletmesinde yetiştirilen siyah alaca sığırların laktasyon eğrisi özellikleri(2009) Keskin, İsmail; Çilek, Süleyman; İlhan, FatmaBu çalışma, Polatlı Tarım İşletmesinde yetiştirilen Siyah Alaca sığırların laktasyon eğrisi özelliklerinin belirlenmesi amacıyla yapılmıştır. Laktasyon eğrisi parametreleri ile eğrinin tip ve şekillerinin belirlenmesinde Wood’un geliştirdiği Gamma fonksiyonu (Yt atbe-ct) kullanılmış, a, b ve c parametrelerinin aldıkları değerlere göre laktasyon eğrisi tipleri tanımlanmıştır. Tipik laktasyon eğrisinde parametrelerin hepsi pozitiftir. Parametrelerden herhangi birisinin negatif olması durumunda eğri tipik olmayan eğri, eğer b ve c parametrelerinin her ikisi de negatif ise eğri içbükey, b negatif fakat c pozitif ise laktasyon eğrisi azalan tip eğri olarak ifade edilmiştir. İncelenen toplam 2581 laktasyon kaydının 2049’unun (%79.39) tipik, 253’ünün (%9.80) içbükey ve 279’unun ise (%10.81) azalan tip eğri karakterinde olduğu tespit edilmiştir. Tipik olarak adlandırılan laktasyon eğrilerine ait parametreler, a (başlangıç süt verimi), b (yükselme katsayısı), c (düşüş katsayısı), S (persistensi), Tmax (günlük maksimum süt verimine ulaşma süresi), Ymax (günlük maksimum süt verimi) ve R2 (belirleme katsayısı) sırasıyla 27.50.18, 0.470.008, 0.1780.0023, 2.70.001, 812.1, 26.70.15, 68.00.50; içbükey için, a, b, c, Tmax, Ymax ve R2 sırasıyla 23.50.42, -0.370.016, -0.0620.0038, 744159, 16.50.42 ve 47.81.68; azalan tip eğri için ise, a, b, c, Tmax, S ve R2 sırasıyla 27.60.41, -0.130.007, 0.0510.0023, -567327, 2.90.05 ve 65.81.33 olarak tespit edilmiştir.Öğe Prediction of Fattening Final Live Weight from some Body Measurements and Fattening Period in Young Bulls of Crossbred and Exotic Breeds using MARS Data Mining Algorithm(ZOOLOGICAL SOC PAKISTAN, 2018) Aytekin, İbrahim; Eyduran, Ecevit; Karadaş, Köksal; Akşahan, Rifat; Keskin, İsmailThe aim of this investigation was to develop a prediction equation for fattening final live body weight from several body measurements and fattening period of native, crossbred and exotic breeds. For this aim, a total of 103 young bulls were used. In the prediction of fattening final live weight as an output variable, several continuous predictors evaluated in the current study were: withers height (WH), back height (BH), front rump height (FRH), back rump height (BRH), body length (BL), back rump width (BRW), chest depth (CD) and chest circumference (CC). Also, the breed factor was considered as a nominal predictor and fattening period (FP) was accepted as an ordinal predictor. To obtain the prediction equation, the results of Multivariate Adaptive Regression Splines (MARS) data mining algorithm as a non-parametric regression technique was implemented. To measure predictive accuracy of MARS, model evaluation criteria such as coefficient of determination (R-2), adjusted coefficient of determination (R-ADJ(2)), SDRATIO and Pearson coefficient (r) between actual and predicted values in fattening final live weight were calculated. To reveal the highest predictive ability in the MARS algorithm, numbers of terms and basis functions were set at 21 and 45 where order of interactions was three. Except for CD, other predictors were entered into MARS model. MARS showed very high predictive capability (R-2=0.9717, R-ADJ(2)=0.9643, SDRATIO=0.168 and r=0.986) for the data evaluated in the investigation. Also, GCV value of the MARS prediction equation was found as 409.83. In conclusion, it could be suggested that a very reliable prediction equation with the predictive accuracy of nearly 100 (%) was developed in practice by using MARS data mining algorithm, which a quite remarkable tool in the prediction of fattening final live weight with interaction effects of predictors and in description of breed standards, in the development of breeding strategies and especially in the detection of ideal fattening period for each breed under the condition.Öğe Prediction of Fleece Weight from Wool Characteristics of Sheep Using Regression Tree Method (Chaid Algorithm)(ZOOLOGICAL SOC PAKISTAN, 2016) Eyduran, Ecevit; Keskin, İsmail; Ertürk, Yakup Erdal; Dağ, Birol; Tatlıyer, Adile; Tirink, Cem; Akşahan, RifatThe goal of the current investigation was to predict the fleece weight from some physical wool characteristics of Akkaraman (47 heads) and Awassi ewes (108 heads) by using CHAID algorithm to obtain more flexible prediction through tree-based decision. All of the ewes were 2 years of age. The wool characteristics evaluated for the study were fleece weight (FW), staple length (SL), fiber length (FL), average number of crimps over a length of 5 cm (ANC) and wool fineness (WF). Results of the visual analysis from decision tree diagram demonstrated on the basis of CHAID algorithm that i) the Awassi sheep with both SL > 13 and FL <= 15 produced the heaviest FW average, ii) Akkaraman sheep was the group that had the lightest FW average (1.904 kg), none of all the analyzed characteristics influenced FW trait of Akkaraman sheep, iv) FL influenced solely FW of Awassi sheep with SL > 13 (Adjusted P < 0.05). To conclude, use of CHAID algorithm for the high heritable wool characteristics of economic significance could give precious information for determining sheep with high yields.Öğe Relationship between Persistency Values Defined with Various Methods and Some Lactation Traits of Brown Swiss Cattle in Turkey(GARUDA SCIENTIFIC PUBLICATIONS, 2008) Zülkadir, Uğur; Aytekin, İbrahim; Keskin, İsmailThe study was conducted to compute the persistency values of the animals in different lactation periods with various methods drawing upon 3695 test day milk yield of 182 lactations of Brown Swiss cattle in Konya Konuklar Agricultural Enterprise. The computed persistency values of the animals in the first lactation were different (P<0.01) from the other lactations. Lactation number (P<0.05) and calving seasons (P<0.01) effected persistency values. The phenotypic correlation of the methods within the group and with lactation milk yield, lactation period, daily average milk yield and daily maximum milk yield were highly significant (P<0.01). The Solkner and Fuchs's model based on standard deviation of 305 d lactation period showed the highest phenotypic correlation for lactation milk yield (LMY), daily average milk yield (DAMY), daily maximum milk yield (DMMY), and the best fit to the data collected from Brown Swiss cattle and allowed a suitable description of the shape of the lactation curve.Öğe Siyah Alaca sığırlarda hemoglobin polimorfizmi(2004) Zülkadir, Uğur; Keskin, İsmail; Sarıyel, VahdettinBu çalışmada Konya'da özel bir işletmede yetiştirilen Siyah Alaca sığırların hemoglobin polimorfizmi araştırılmıştır. İşletmede bulunan 65 baş sığırdan kan alınarak hemoglobin tipleri bakımından analiz yapılmıştır. Yapılan analizler sonucunda iki hemoglobin alleli belirlenmiş; bunlardan Hb A'nın gen frekansı 0.9615, Hb B'nin gen frekansı ise 0.0385 olarak tespit edilmiştir. İncelenen Siyah Alaca sığır populasyonunun Hb lokusu bakımından dengede olduğu görülmüştür.Öğe Süt sığırlarında laktasyon eğrilerinin farklı matematik modellerle belirlenmesi ve kontrol aralığının tesbiti(Selçuk Üniversitesi Fen Bilimleri Enstitüsü, 2004-10-04) Keskin, İsmail; Tozluca, AbdurrahmanBu çalışmada, farklı matematik modeller kullanılarak İsviçre Esmeri sığırların laktasyon eğrilerini en iyi belirleyen modellerin tespiti amaçlanmıştır. Tarım ve Köyişleri Bakanlığı Çumra Tarım Meslek Lisesi Esmer sığır sürüsünden elde edilen toplam 773 laktasyon kaydı değerlendirilmiştir. Çalışmada sekiz matematik model incelenmiştir. Bu modeller: Modeli: Y{t) = atb e{~cl) Model 2: Y{t) = at" eT (l + uSin(t) + vCos(t)) Model 3: Y{t)=a + bt + ct2 Model 4: Y,t)=a + bt + et2 + df Model 5: Y(!) = atb I Cos{ct) Model 6: Y{l)=a + bt + c{llt) Model 7: Y{i) = a - bt + ct2 1 2 + d log (t) Model 8: Y{l) = 1 1 (a + bt + ct2 ) Süt verimi kayıtları laktasyon sırası ve laktasyonun başlama mevsimine göre standardize edilerek, modellerin laktasyon eğrisine uyumları incelenmiş ve karşılaştınlmıştır. Bunun yanında modellerin laktasyon sıralan ve laktasyonun başlama mevsimine göre elde edilen eğrilere uyumları incelenmiştir. Standardize edilmiş verilere tüm kontrol aralıklarında Model 1 ve model 2 nin daha iyi uyum gösterdiği tespit edilmiştir. Belirleme katsayılarının laktasyon sıralarına göre önemli bir değişme göstermediği, tüm laktasyonlarda da Model 1, Model 2 ve Model 7'nin daha iyi uyum gösterdiği belirlenmiştir. Laktasyona başlama mevsimi ilkbahar ve kış olan hayvanlara ait belirleme katsayılarının daha yüksek olduğu ve Model 1, Model 2 ve Model 7'nin daha iyi uyum gösterdikleri tespit edilmiştir.
