Carcass characteristics of Karadi lambs as affect by different levels of dietary supplement of rumen degradable nitrogen fed with Nigella sativa

The objective of the work described here was to investigate the effect of two levels of Nigella sativa (0 and 7.5 g NS / kg DM) supplementation to rations of Karadi lambs fed three levels of rumen degradable nitrogen (1, 1.3 and 1.6 g RDN / MJ of ME) on carcass characteristics, using 2 x 3 factorial experiment. Twenty four individual Karadi male lambs were used (four lambs for each treatment). They were weighing approximately 30 kg live weight and 7 months old. The diets were formulated to be given at40% NaOH-treated barley straw DM to 60% concentrates DM. At the end of feeding trial, all the lambs were slaughtered after over night with feeding straw. Live weight gain was improved (P < 0.05) in lambs fed diets supplemented with NS as compared with those lambs fed diet without NS. However, live weight gain was not affected by levels of RDN. Changes in slaughter weight, Killing out proportion, leg cuts tissue, the wholesale cuts weight and fat-tail weight were not significantly affected by both NSsupplementation and levels of RDN. However, the heavier slaughter weights, cold carcass and fat tail weights were associated with lambs fed highest level of RDN supplemented with NS (P < 0.05). Moreover, there is a linear increase in fat-tail weight associated with lambs fed increasing levels of RDN supplemented with NS

Carcass yield and characteristics of Karadi lambs as affected by dietary supplement of rumen undegradable nitrogen fed with Nigella sativa

The objective of this work was to investigate the effect of two levels of rumen undegradable nitrogen (7 and 10 g UDN/kg DM) fed with two levels of Nigella sativa (0 and 7.5 g NS/ kg DM) supplementation to rations of karadi lambs on carcass characteristics, using 2 x 2 factorial experiment. Sixteen individual Karadi male lambs were used (four lambs for each treatment). They were weighing approximately 34 kg live weight and 7 months old. The diets were formulated to be given a 40% NaOH-treated barley straw DM to 60% concentrates DM. At the end of feeding trial the lambs were slaughtered after over night with feeding draw. Differences in daily nutrients intake among treatments were not statistically significantly. The UDN and total N intake were followed the intended treatments composition (P < 0.01). Live weight gain was not significantly affected by levels of UDN and NS supplementation. Slaughter body weight, hot and cold carcass weights and killing out proportion were not significantly affected by both NS supplementation and levels of UDN. Moreover, no differences in leg cut tissue (lean, subcutaneous fat: intramuscular fat and bone) among treatments. The main wholesale cuts weights were not significantly different among treatments. The differences in fat-tail weights between the NS and UDN treatments were not statistically significant.Key words: Lambs, rumen undegredable nitrogen, Nigella sativa, carcass characteristic