تأثير إضافة مستويات مختلفة من اللايسين و الميثيونين لخلطات الفروج في بعض مواصفات الذبيحة

الملخص EN

The study was taken place at the experimental station (kharabo), Faculty of Agriculture, Damascus University, 1464 - one day old chicks of the hybrid Lohmann were used to determine the effect of adding different levels of methionine without or with lysine on some of carcass traits.

Chicks were divided randomly and equally into 8 groups (183 each) at the first day with 3 replicates for every group (61 each).

The birds of each replicate were housed and managed within an open- independent room on deep litter till 42 days under similar conditions.

All chicks in groups 1,2,3,4 were fed with 3 plant mixtures with methionine added by ratio 1, 1.5 ,2, and 2.5kg/ton, respectively), and chicks of groups 5,6,7,8 were also fed with the same mixtures and methionine as well as with lysine added by 1kg/ton each.

The studied parameters were: losing in live weight, weight for each of heart, liver, and spleen, gizzard, dressing percentage, chest muscle, thigh muscle and abdomen.

Results showed that adding lysine by ratio 1kg/ton to plant mixtures caused significant increasing (2.5%) in dressing percentage, and significant decrease (0.26%) in percentage of liver and spleen weight, and no significant effect for n adding lysine on the parameters taken at pre - and post-slaughtering operation.

It was also found that adding methionine by 1 to 2 kg/ton did not cause significant effects on the parameters measured at pre - and post-slaughtering operation and carcass traits.

However, there was an increase (3.5%) in net gain at the end of rearing period.