Person: DURU, SERDAR
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DURU
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SERDAR
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Publication Effect of sex on fattening performance and carcass characteristics in kivircik lambs(Kahramanmaras Sutcu Imam Univ Rektorlugu, 2021-01-01) Koyuncu, Mehmet; KOYUNCU, MEHMET; Altincekic, Seniz Ozis; ÖZİŞ ALTINÇEKİÇ, ŞENİZ; Duru, Serdar; DURU, SERDAR; Canbolat, Onder; CANBOLAT, ÖNDER; Bursa Uludağ Üniversitesi/Ziraat Fakültesi.; 0000-0001-9044-8092; 0000-0001-5243-4458; I-9517-2017; AAG-8210-2021; JPL-0865-2023The aim of this study was to evaluate the effect of sex on fattening performance and carcass characteristics of Kivircik lambs. Fifty head weaned Kivircik lambs, half males and half females, were used in fattening period. After weaning, the growth and feed consumption of the male and the female lambs fattened for 56 days were recorded. Average daily weight gain differed significantly (P<0.01) between the males and the females (294.9 and 214.2 g, respectively). A total of 10 lambs (5 males and 5 females) were slaughtered and the left side of the carcasses was cut into five joints. Dressing percentage (hot/cold) based on full weight and empty body weight were lower (P<0.05) for the males than the female lambs. Sex had a significant effect on kidney-knob and channel fat weight, M. longissimus dorsi section area (MLDA) and liquid expelled (P<0.01). Sex primarily affected the quantity of all types of fat deposits. The male lambs had higher muscle, muscle/bone and muscle/total fat ratios than females.Publication Determination of starting level of heat stress on daily milk yield in holstein cows in bursa city of Turkey(Atatürk Üniversitesi, 2018-01-01) Duru, Serdar; DURU, SERDAR; 0000-0001-5243-4458; I-9517-2017The aim of this study was to investigate the starting levels of heat stress on daily milk yield (DMY) in Holstein cows reared in Marmara region in Turkey. For this purpose, a total of 68113 daily milk records of 212 Holstein Friesian cows raised in Bursa, a city in Marmara region, during 2010-2012 were evaluated. The temperature humidity index (THI) was used to investigate the effect of heat stress. The effects of year, lactation number, days in milk (DIM) and THI on milk yield were found significant (P<0.01). DMY's smallest, largest, average values were 3.0, 72.1, 28.9 +/- 0.04, respectively, and the 305-day average milk yield was 9435 +/- 156.12 kg. DMY smallest adjusted average occurred in August (24.0 kg), while the highest occurred in April (31.5 kg). THI ranged between 26 and 79, the first THI value having adverse effect on milk yield was 65, and THI threshold value irreversibly affecting the milk yield is 70. THI value of 70 and above were detected more than 268 days from May to September in three years. The correlation coefficient between THI and the daily milk yield was calculated as -0.771. Also on farms in similar climatic conditions, precautions must be taken against heat stress. Continuous recording of temperature and humidity and the operation of the cooling system in the barns according to the THI can be more effective against heat stress.Publication Effectiveness of genetic grouping with different strategies for estimation of genetic parameters in growth traits in merino lambs(Elsevier, 2022-10-07) Oral, Hülya Hanoğlu; DURU, SERDAR; Altıncekiç, Seniz Özis; ÖZİŞ ALTINÇEKİÇ, ŞENİZ; Bursa Uludağ Üniversitesi/Ziraat Fakültesi; 0000-0001-5243-4458; 0000-0001-9044-8092; 0000-0003-3626-9637; JPL-0865-2023; I-9517-2017; AAG-8210-2021The effectiveness of genetic grouping in genetic evaluations for growth traits in Merino sheep was researched in this study. In the study, 17,537 lambs born to 48 rams and 7118 ewes in 30 flocks were evaluated in animal models using REML. A model without a genetic group (GG0) was used in the analysis, as well as a model with three different genetic groups (GG). Maternal genetic and common environmental effects are included in all models. However, the models with and without covariance between direct and maternal effect were used for each trait. The Akaike Information Criterion (AIC) was used to compare models, taking into account the accuracy and Pearson and Spearman correlations between 48 rams for breeding values. Direct heritability (h2d), maternal heritability (m2) and maternal common environmental effects (c2m) were generally found to be less than 0.10. The most important source of variation was found to be flock-year-season (FYS). It is worth bearing in mind that c2FYS has a very high share of phenotypic variance in all models, ranging from 0.07 +/- 0.01-0.43 +/- 0.03. The fact that there is such a wide environmental difference between enterprises in the same region is a major issue for the improvement programme. It is necessary to intensify studies on the one hand for the expansion of small busi-nesses and on the other hand for more modern animal husbandry to achieve this. AIC found that models based on GGs were better suited for all traits. Unlike AIC, the GG0 model had the highest accuracy for rams. The accuracy of the model (GG3), in which the mothers of animals whose father was unknown were also deleted and genetically grouped for both, was found to be lower for ADG and higher for WW. Furthermore, while the average accuracy for BW decreased to 0.60 in the other genetic group (GG1: lambs born in the same year in a flock and GG2: lambs born in a flock) models, it was found to be around 0.80 for ADG and above 0.80 for WW. According to research findings, it is possible to perform a genetic evaluation without losing data, especially in pedigrees with unknown fathers.Publication Factors affecting colostrum quality and calf passive transfer levels in holstein cattle(Polska Akad Nauk, Inst Genetyki I Hodowli Zwierzat, 2019-01-01) Özlüer, Abdurrahman; Abdullahoğlu, Elif; Duru, Serdar; DURU, SERDAR; Filya, İsmail; FİLYA, İSMAİL; Bursa Uludağ Üniversitesi/Veteriner Fakültesi.; 0000-0001-5243-4458; I-9517-2017; AAH-2927-2021The aim of this study was to determine the quality of colostrum in Holstein cattle and factors affecting serum total protein and immunoglobulin levels of calves. In the study colostrum samples taken from 334 Holstein cows in the first milking and serum samples collected from 354 calves born to these cows were evaluated using a digital refractometer. The minimum, maximum, mean and standard error values were 14.4%, 40.6% and 27.9 +/- 0.2%, respectively, for the colostrum Brix and they were 19.7 mg/ml, 168.1 mg/ml and 95.9 +/- 1.4 m g/ml, respectively, for colostrum immunoglobulin. The same values were 3.9 g/dL, 10.9 g/dL and 6.5 +/- 0.1 g/dL, respectively, for the serum total protein and 2.2 mg/ml, 37.7 mg/ml and 13.6 +/- 0.3 mg/ml, respectively, for immunoglobulin. The share of the colostrum samples below Brix 22% was 8.2% and that of the samples with immunoglobulin levels below 50 mg/ml was 3%. The percentage share of calves with a scrum total protein level below 5.5 g/dL. was found to be 15%, while the percentage of the immunoglobulin levels below 10 mg/ml was found to be approximately 30%. Birth season, lactation number, birth type and body condition score were found to have significant effects on colostrum quality (P<0.05). The serum total protein and immunoglobulin levels of female calves born in spring-summer to cows in their 4th and successive lactation and consuming at least 3 L colostrum Brix 30% in the first feeding were higher than in the others. Colostrum quality of cows and serum characteristics of calves should be evaluated in dairy farms. This is especially important for farms where calf deaths are more prevalent. Because of varying absorption ability, it may be advisable to give Holstein calves 3 L colostrum including IgG with min. Brix 23% or min. 80 mg/ml in the first feeding.