Fattening performance and carcass value of Awassi ram lambs, F1 crossbreds of Romanov x Awassi and Charollais x Awassi in Jordan

Shaker, M.M.; Abdullah, A.Y.; Kridli, R.T.; Blaha, J.; Sada, I.; Sovjak, R.

Czech Journal of Animal Science 47(10): 429-438

2002


ISSN/ISBN: 1212-1819
Accession: 003768651

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Abstract
The goal of this study was to examine and evaluate the effect of lamb genotype on the growth, feed consumption, feed conversion and carcass value of Awassi (A) ram lambs, F1 crossbreds of Romanov (R) x Awassi and Charollais (Ch) x Awassi. Average daily weight gain and total weight gain during the trial were 199+or-0.01 g and 12.33+or-0.58 kg in pure Awassi ram lambs, 216+or-0.01 g and 13.37+or-0.71 kg in F1 crossbreds A x Ch and 268+or-0.01 g and 16.66+or-0.58 kg in F1 crossbreds A x R (P<=0.01). Statistically significant differences between the genotypes were found in diagonal body length, rump height and chest girth (P<=0.01). Evaluation of carcass byproducts shows that the genotype affected the weight of full and empty digestive tracts, small intestine, heart, liver, intestinal fat, testicles, kidney and kidney fat (P<=0.05-0.01). The highest dressing percentage (including fat tail) in warm condition was 50.93+or-1.11% in Awassi ram lambs and if compared with F1 crossbred A x Ch (50.34+or-1.36%) and F1 crossbreeds A x R (49.05+or-1.11%), no statistically significant difference was found. The highest percentage ratios of leg, loin and rack, which represent the prime meat of carcass, were 57.08+or-1.72% in F1 crossbreds A x Ch, 54.14+or-1.40% in F1 crossbreds A x R and 48.99+or-1.40% in Awassi ram lambs (P<=0.001). The highest fat tail percentage (13.4+or-1.06%) was in Awassi ram lambs and the lowest (1.76+or-1.06%) in F1 crossbreds A x R (P<=0.001). In general, the results of this study demonstrated that F1 crossbreeds A x R and F1 crossbreds A x Ch were superior to Awassi ram lambs in daily weight gain and total weight gain, feed conversion, lower costs per 1 kg meat gain and mainly in the carcass indicators.