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Öğe Comparison of slaughter and carcass characteristics of Limousin, Charolais, Angus, and Hereford beef cattle in Turkey(Springer Science and Business Media B.V., 2022) Kayar, Tamer; İnal, ŞerefThe slaughter and carcass features of four breeds named Limousin (LI), Charolais (CH), Angus (AN), and Hereford (HE) were examined. Nine calves from each breed were slaughtered at an average age of 18.5 months. The animals were weighed before slaughter, and the slaughter weights as well as some body measurements of the animals were recorded. The dismemberment of the carcasses was performed after a resting period of 24 h at + 4 °C. The slaughter weights were 581.89, 590.72, 577.67, and 610.89 kg, respectively. Chilled carcass weights were 348.26, 346.91, 327.60, and 338.10 kg, respectively, with no significant differences among breeds. Dressing percentages were 59.89, 58.75, 56.71, and 55.33%, and the valuable meat ratios were 27.89, 27.66, 24.45, and 24.32%, respectively. Carcass bone ratios were 13.89, 14.17, 14.64, and 14.61%, respectively. The longissimus muscle areas (LMA) were 97.46, 102.29, 81.05, and 83.93 cm2, and the subcutaneous fat thickness was 0.38, 0.43, 1.00, and 1.32 cm, respectively. Significant differences were observed among breeds in terms of these characteristics. Carcass weight was highest in LI, and LI and CH breeds had higher carcass yields than the other two breeds. Although HE had the highest slaughter weight, it showed the lowest carcass yield.Öğe Evaluation of the relationship of some environmental factors and number of inseminations per pregnancy with milk yield in holstein cows(Sezer ÖZ, 2024) Erzurum, Onur; Kayar, TamerIn order to investigate the relationship between some environmental factors and the number of artificial inseminations per pregnancy with milk yield, data of 90 healthy Holstein breed dairy cows in a private dairy farm in Karapınar district of Konya province were taken. For the utilization of the data, age, number of artificial inseminations, lactation yield, calving season and sequence of lactation records were taken from the herd management program in the enterprise and analysed. As a result of the analysis, the number of artificial inseminations per pregnancy in 2016 was 1.79 and lactation milk yield was 10079,41 kg; the number of artificial inseminations per pregnancy in 2017 was 2.16 and lactation milk yield was 9767.94 kg. There was a statistically significant relationship between the number of artificial inseminations per pregnancy and milk yield during lactation period in both years. As a result, the increase in the number of artificial inseminations per pregnancy negatively affected the average milk yield of lactation period. Genetic and environmental factors are thought to play a major role in this effect.Öğe Fattening Performance and Some Carcass Characteristics of Hereford and Angus Steers Fed a High Roughage(Veteriner Fakultesi Dergisi, 2023) Kayar, Tamer; Budak, DuyguThis study was carried out to compare the fattening performances, some slaughter and carcass characteristics of 10-month-old Hereford (HER) and Angus (ANG) steers fed a high roughage with the same care and feeding conditions in Türkiye. A total of 40 steers, 20 HER and 20 ANG from the same herd, were selected as homogeneously and randomly divided into two groups. The average body weights of the breeds were determined as 276.85±9.70 and 288.10±9.86 kg, respectively, and the differences between the breeds were insignificant (P>0.050). All animals were fed ad-libitum with two different Total Mixed Rations (TMRs) prepared with a concentrate: roughage ratio of 34:66% during the fattening. In the experiment, fattening feed containing 14.12% crude protein (CP) and 2671 kcal/kg metabolic energy (ME) for the first 300 days and fattening finisher feed containing 14.11% CP and 2717 kcal/kg ME for the last 45 days were used. At the end of the study, which lasted for a total of 345 days, the 1 kg live weight costs of the animals were calculated. Differences were insignificant between the two breeds in terms of body weights, final weights (slaughter weights), total weight gains, daily live weight gains, daily dry matter consumption, feed conversion ratios, hot and cold carcass weights, head weight to carcass ratio and longissimus muscle area (LMA) during fattening (P>0.050). Head and skin weights (P=0.000 and P=0.003) and subcutaneous fat thickness (SFT) (P=0.000) were higher in the HER breed. The profit ratio with the cost did not change. It was concluded that both breeds had similar characteristics.Öğe Thiol/Disulphide Homeostasis in the Relationship Between Body Condition Score and Oxidative Stress in Periparturient Period Holstein Heifers(John Wiley and Sons Inc, 2025) Kayar, Tamer; Özkurt, Güzin; Erzurum, Onur; Er, Kübra; Büyükgüngör, Beril; Geçgel, Beyza Nur; Karaburç, Muhammet NureddinThis study aimed to evaluate the effects of body condition scores (BCSs) on oxidative stress and thiol/disulphide homeostasis (TDH) in Holstein pregnant heifers during the transition period. A total of 36 healthy primiparous heifers in the 7th month of pregnancy, all approaching their first calving, were included in the study. The animals were allocated into three equal groups based on their BCS. The BCS measurements were performed 21 days pre-calving and on the 21st day post-calving. Pre-calving and post-calving serum levels of total thiol (TTL), native thiol (NTL) and disulphide (DSF) were quantified using standard techniques. The study revealed significant differences in BCS, TTL and DSF values among groups both pre- and post-calving (p < 0.05), whereas the changes in NTL values were statistically insignificant (p > 0.05). Overall, a decrease in BCS and NTL levels was observed, accompanied by an increase in TTL and DSF levels. Correlation analysis within groups indicated low-level relationships between changes in BCS and TTL, NTL and DSF levels. Consequently, regression analysis did not yield any statistically significant predictive models. The results showed a differential response between the loss of BCS and the oxidative stress during the periparturient period. The increased DSF levels observed during late pregnancy and early lactation indicate a deficiency in antioxidant substances in the animals. Therefore, supplementing the ration with a premix containing antioxidant substances during the transition period may provide significant benefits in terms of maintaining the BCS balance, animal welfare and herd health.
