Browsing by Author "Gülendağ, Erman"

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Milk Composition Traits of Hamdani Crossbreed Sheep Raised Under Extensive Management
(2023) Turgut, Ali Osman; Gülendağ, Erman; Koca, Davut; Üner, Sefa
This study aimed to reveal the milk composition traits of Hamdani crossbred sheep (Hcs) raised under extensive conditions. A total of 96 sheep milk samples were collected during the early lactation stage. Selected ewes did not have clinical mastitis or subclinical mastitis. Milk composition analyses were performed using milk autoanalyzer. Mean values for milk fat (%), solid non-fat (SNF) (%), protein (%), lactose (%), salt (%) and pH, conductivity (mS/cm), freezing point (⸰C) and density (kg/m3) in Hcs were determined as 7.49±0.15, 8.69±0.08, 4.13±0.04, 3.89±0.04, 0.62±0.01, 6.93±0.04, 4.05±0.07, -0.5±0.01, and 1.027.84±0.38 respectively. In correlation analysis, negative and significant correlations were detected between milk fat and protein (r=- 0.368, p<0.001), milk fat and SNF (r=-0375, p<0.001) milk fat and lactose (r=-0.380, p<0.001). On the other hand, positive and significant correlations were detected between SNF and milk protein (r=0.999, p<0.001), SNF and salt (r=0.963, p<0.001), and SNF and lactose (r=0.976, p<0.001). As a result, the milk fat percentage of Hcs was higher compared to other native sheep breeds of Turkey. In addition, phenotypic variation for milk fat percentage was found to be high among individuals in the same flock. These findings may contribute to new studies to improve milk composition traits in Hamdani crossbred sheep.
Norduz Koyunlarında Sütün Kimyasal Yapısı ve Fiziksel Özellikleri
(2023) Koca, Davut; Turgut, Ali Osman; Çetin, Nebi; Üner, Sefa; Gülendağ, Erman; Karagülle, Bahtiyar
Bu çalışmada, Van ili Gürpınar ilçesinde yetiştirilen Norduz koyunlarının orta laktasyon döneminde süt kompozisyon özelliklerinin ortaya konulması amaçlanmıştır. Koyunlar klinik ve subklinik mastitis yönünden değerlendirilmiş ve örnekler yalnızca sağlıklı koyunlardan toplanmıştır. Bu amaçla toplam 104 koyun sütü örneği toplandı. Norduz koyun sütünün kimyasal ve fiziksel özellikleri, süt otoanalizörü kullanılarak belirlenmiştir. Çalışmada Norduz sütünde süt yağı (%), 2.48±0.11; yağsız kuru madde (SNF) (%), 10.76±0,08; süt proteini (%), 5.09±0.04; laktoz (%), 4.79±0.04; pH, 6.93±0.02; iletkenlik (mS/cm), 4.41±0.04; donma noktası (°C),-0.602±0.80; tuz (%), 0.8035±0.66; ve yoğunluk (kg/m3), 1039.73±0.39 olarak belirlenmiştir. Süt yağı ile protein (r=-0.36, p<0.001), süt yağı ile SNF (r=-0.32, p<0.001) ve süt yağı ile laktoz (r=-0.36, p<0.001) arasında negatif ve istatistiksel olarak anlamlı korelasyonlar gözlenmiştir. SNF ile süt proteini (r=0.90, p<0.001), SNF ile tuz (r=0.87, p<0.001) ve SNF ile laktoz (r=0.90, p<0.001) arasında ise pozitif ve anlamlı ilişkiler belirlenmiştir. Özetle, Norduz koyun sütünün protein içeriği Türkiye'de yetiştirilen koyun ırklarının çoğunluğunun protein içeriğinden yüksek olduğu tespit edildi. Bu bulgular Norduz koyunlarının süt bileşiminin arttırılmasına değerli bir katkı yapma potansiyeli taşımaktadır.
Paep Gene Restriction Fragment Length Polymorphism and Its Effects on Milk Composition in Cross-Bred Hamdani Sheep
(2024) Turgut, Ali Osman; Gülendağ, Erman; Koca, Davut; Üner, Sefa
Β-lactoglobulin (βLG) stands as the primary whey protein in ruminant milk, synthesized by mammary gland cells during lactation and encoded by the βLG gene. This study aimed to assess the impact of βLG gene exon II polymorphism on milk composition traits in crossbreed Hamdani sheep. Sheep were examined for clinical diseases and mastitis. Milk and blood samples were only collected from healthy ewes. The composition and physical properties of milk were analyzed using milk autoanalyzer. The βLG gene exon II region's 452 bp PCR products were subjected to RFLP analysis using the RsaI restriction enzyme. Two genotypes, AA and AB, were identified for the βLG gene exon II region, with A and B allele frequencies of 0.7 and 0.3, respectively. Statistical analysis, conducted with Minitab® (Version: 19.2020.2.0), revealed that the AA genotype is associated with a higher milk fat percentage p<0.05). However, no significant genotype effect was observed for other milk composition traits in cross-bred Hamdani sheep. These results suggest that PAEP genotypes could serve as valuable indicators for enhancing milk composition in cross-bred Hamdani sheep through breeding programs.