İvesi ve ost-friz x ivesi melez (f1) kuzularda besi performansı, kesim ve karkas özellikleri

Abstract

Bu araştırma, İvesi Ost-Friz x İvesi (F1) melezi kuzuların besi performansı, kesim ve karkas özelliklerinin araştırılması amacıyla yapılmıştır. Besi döneminde saf genotipden 7, melez genotipden 9 baş, kesim ve karkas özelliklerinin belirlenmesinde saf genotipden 7, melez genotipden 6 baş erkek kuzu kullanılmıştır. Kuzular ortalama 20 kg besi başı canlı ağırlığı ile büyüklükleri aynı, fakat farklı iki bölmede besiye alınmış, 45 kg canlı ağırlığa ulaşana kadar kuzulara ad libitum kesif yem ve kuru yonca verilerek beslenmiştir. Besi süresince kuzulara daima temiz içme suyu sağlanmıştır. Daha sonra kesim ve karkas özelliklerini incelemek amacıyla kesilmişlerdir. Besi süresince günlük ortalama canlı ağırlık artışı, saf ve melez grupta sırasıyla 225 ve 222 g, 1 kg canlı ağırlık artışı için tüketilen ortalama konsantre yem 5.98 ve 5.15 kg olarak bulunmuştur. Kırkbeş kg kesim ağırlığında kesilen İvesi ve Ost-Friz x İvesi (F1) kuzularda sırasıyla, soğuk karkas ağırlığı 21.80 ve 20.93 kg, karkas randımanı %48.31 ve 44.29, karkas da but oranı %31.04 ve 30.79, karkasta kol oranı %16.78 ve 18.37, kuyruk yağı oranı %11.60 ve 1.72 (P<0.01), MLD kesit alanı 19.08 ve 16.08cm2 , kabuk yağı kalınlığı 16,35 ve 6.1 mm (P<0.001) olarak bulunmuştur.In this study, fattenning performance, slaughter and carcass characteristics of Awassi and East-Friesian x Awassi (F1) crossbred male yearling lambs were determined. Seven Awassi lambs and 9 East-Friesian x Awassi (F1) crossbred animals were used to determine fattening performance and 7 Awassi and 6 East-Friesian x Awassi (F1) male lambs were used to determine slaughter and carcass characteristics in the study. Animals were fed in two separate boxes which had similar living conditions. At the start of fattening, all the animals had 20 kg avarage live body weight and when live body weight reached to 45 kg/each, the fattening stage was ceased. During the fattening period, animals were fed with intensive lamb feed and alpha alpha hay ad libitum. Clear drinking water was provided at all temis. After the fattening, animals were salughtered and carcass characteristics were determined. During the fattening, the average daily weight gain for Awassi and EastwFreiesian x Awassi (F1) crossbred lambs were 225 and 222 g respectively. Average daily grain or concentrated feed consumption for the groups were 5.98 and 5.15 kg respectively. Purebred and crossbred animals slaughtered at 45 kg live body weight had 21.80 and 20.93 kg cold carcass weight respectively. Carcass dressing percentage in these animals were 48.31 and 44.79% respectively. Percentage of rearleg, foreleg and tail fat were 31.04, 16.78 and 11.60% in Awassi lambs and 30.79, 18.37 and 1.72% in East-Friesian x Awassi (F1) crossbreds. The difference in tail fat percentage between two groups was statistically significant (P<0.01). In the groups, MLD areas were 19.08 and 16.082 and backfat thicknesses were 16.35 and 6.1 mm (P<0.001) respectively.