Sürdürülebilir Islah Programı İçin Kıvırcık Koyunlarında Büyüme ve MLD Kas Özelliklerinin Kullanımı

Abstract

Bu araştırma, Aydın ilinde yürütülen “Kıvırcık Koyunu Islah Projesi” kapsamında yetiştirilen kuzularda büyüme performansı ve ultrasonla belirlenen karkas özelliklerini incelemek amacıyla yürütülmüştür. Çalışmada ortalama yaş 109 gün olan toplam 241 baş Kıvırcık kuzu kullanılmıştır. Hayvanlar doğum ağırlığı (BW), canlı ağırlık (LW), ortalama günlük canlı ağırlık artışı (ADG) ile M. longissimus thoracis et lumborum (LTL) kasına ilişkin kabuk yağı kalınlığı (BFT), deri+yağ kalınlığı (SBFT) ve kas derinliği (MD) bakımından değerlendirilmiştir. Ortalama BW, LW ve ADG değerleri sırasıyla 4.23 kg, 27.17 kg ve 213.3 g/gün; BFT, SBFT ve MD ise 0.31 cm, 0.51 cm ve 1.91 cm olarak elde edilmiştir. İşletmeler arasında tüm özellikler bakımından istatistik olarak önemli farklılıklar bulunmuştur (p<0.001). İşletme-1’deki kuzular en yüksek LW ve ADG değerlerine sahip olurken, İşletme-5’te yer alan kuzular en yüksek BW ve MD değerlerini göstermiştir. Tek doğan kuzular ikizlere göre daha yüksek BW ve ADG değerleri sergilemiştir. Erkekler, dişilere kıyasla daha yüksek BW, LW ve ADG değerleri göstermiş (p<0.001), dişiler ise BFT ve SBFT bakımından üstün bulunmuştur. Regresyon analizleri BW’nin hem LW hem de ADG üzerine güçlü ve anlamlı etkilerini ortaya koymuştur (p<0.001). Yaşın LW üzerine pozitif, ADG üzerine ise negatif etkisi belirlenmiştir. Fenotipik korelasyon katsayıları LW ile MD (0.609) ve BFT ile SBFT (0,.917) arasında güçlü ilişkiler ortaya koyarken, ADG ile karkas özellikleri arasındaki ilişkiler istatistik olarak önemsiz olmuştur. Sonuçlar, işletme koşulları, doğum tipi ve cinsiyetin büyüme performansı ve karkas özellikleri üzerinde belirgin etkiler oluşturduğunu göstermektedir.

Keywords

• Sürdürülebilir ıslah
• Büyüme performansı
• Ultrasound ölçümleri
• Kıvırcık koyun

Supporting Institution

Tarımsal Araştırmalar ve Politikalar Genel Müdürlüğü

Ethical Statement

Bu çalışmada hayvanlara invaziv veya deneysel müdahaleler uygulanmamıştır. Bununla birlikte, hayvanlarla ilgili tüm prosedürler, 2010/63/EU Direktifi, ARRIVE kılavuzları ve deneysel ve diğer bilimsel amaçlarla kullanılan hayvanların korunmasına ilişkin ulusal mevzuata tam olarak uygun olarak yürütülmüştür (Anonim, 2011).

Thanks

Bu araştırmaya önemli mali destek sağlayan Tarım Araştırmaları ve Politikaları Genel Müdürlüğü'ne (TAGEM) teşekkürlerimizi sunarız. Bu destek sayesinde, “Yetiştiricilerin Koşullarında Küçük Ruminantlarda Ulusal Genetik Yetiştirme Projesi” kapsamında hayvan materyalleri üzerinde çalışma yapılabilmiştir. Ayrıca, bu çalışmanın kendi sürülerinde gerçekleştirilmesine izin veren ve çok değerli yardımlarda bulunan koyun yetiştiricilerine de teşekkür ederiz.

Using Growth and LTL Muscle Traits in Kıvırcık Sheep to Establish a Sustainable Breeding

Abstract

This study was conducted to examine the growth performance and carcass characteristics, as determined by ultrasound, in lambs raised under the “Kıvırcık Sheep Improvement Project” in the province of Aydın. A total of 241 Kıvırcık lambs, with an average age of 109 days, were included in the study. The animals were evaluated for birth weight (BW), live weight (LW), average daily live weight gain (ADG), and ultrasound measurements of backfat thickness (BFT), skin+fat thickness (SBFT), and muscle depth (MD) related to the M. longissimus thoracis et lumborum (LTL) muscle. The average BW, LW, and ADG values were 4.23 kg, 27.17 kg, and 213.3 g/day, respectively; BFT, SBFT, and MD averaged 0.31 cm, 0.51 cm, and 1.91 cm, respectively. Statistically significant differences were observed between farms for all traits (p < 0.001). Lambs from Farm 1 exhibited the highest LW and ADG values, whereas lambs from Farm 5 had the highest BW and MD values. Single-born lambs showed higher BW and ADG compared to twins. Males demonstrated significantly greater BW, LW, and ADG than females (p < 0.001), while females had superior BFT and SBFT measurements. Regression analyses revealed strong and significant effects of BW on both LW and ADG (p < 0.001). Age positively influenced LW but negatively affected ADG. Phenotypic correlation coefficients indicated strong relationships between LW and MD (r = 0.609) and between BFT and SBFT (r = 0.917), whereas correlations between ADG and carcass traits were not statistically significant. These results suggest that farm conditions, birth type, and sex significantly impact growth performance and carcass characteristics.

Keywords

• Sustainable breeding
• Growth performance
• Ultrasound measurements
• Kıvırcık sheep

Supporting Institution

General Directorate of Agricultural Research and Policies (TAGEM)

Ethical Statement

No invasive or experimental interventions were applied to the animals in the present study. Nevertheless, all animal-related procedures were conducted in full compliance with Directive 2010/63/EU, the ARRIVE guidelines, and the national legislation on the protection of animals used for experimental and other scientific purposes (Anonymous, 2011).

Thanks

We would like to express our gratitude to the General Directorate of Agricultural Research and Policies (TAGEM) for providing essential financial support for this research, which enabled the study to be conducted on animal materials as part of the “National Genetic Breeding Project in Small Ruminants under Breeders' Conditions.” We also extend our thanks to the sheep breeders who permitted this study to take place within their flocks and offered invaluable assistance.

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