معرفة تأثير إحلال مستويات مختلفة من مجروش نوى التمر مع أو بدون إضافة خميرة Saccharomyces cerevisiae الخبز على بعض صفات الذبائح للحملان العربية

الملخص EN

This study was conducted in the Animal Farm of the College of Agriculture – University of Basrah.

A total of 28 Arabi male lambs were used, with average age of 5 months and mean body weight of 21.٤٧ ± 1.33 Kg.

Lambs were distributed equally and randomly into 7 nutrition rations to conduct growth and fattening of Arabi lambs which lasted for 90 days.

The experimental rations were as follows: Ration-1- (control) - fed on concentrate ration only by 3% of body weight.

Ration-2- fed on 90% of the control ration and 10% of ground date stones substituted for the barley.Ration-3- lambs fed on the ration 2 with addition of 3 grams of bakery yeast (Saccharomyces cerevisiae) / Kg of feed.

Ration-4- fed on 80% of the control ration with substitution of 20% of date stones for barley.

Ration-5- lambs fed on the ration 4 with addition of 3 grams of bakery yeast per Kg of feed.

Ration-6- fed on 70% of the control ration and 30% of date stones.

Ration-7- lambs fed on the ration 6 with addition of 3 grams of bakery yeast per Kg of feed.

Results were as follows: 1- The highest weights of rib cut (rib 7-12), leg cut and loin cut were for animals in ration 3 (1.61, 5.00 and 2.40 Kg respectively) than other rations but in the loin cut, the ration 3 was similar to the control ration 2.16 Kg.

2- For body measurements, the highest leg circumference were recorded for animals in rations 2 and 3 (35.00 and 36.50 cm respectively) than other rations but these rations were similar to the control ration.

While the highest rib eye muscle area was for carcasses of animals in ration 3 (14.41 cm2 ) but this value did not differ significantly from that of the control animals (13.45 cm2 ).

3- In the case of some carcass muscle weights, the muscle Supraspinatus weight were higher in the animals of the ration 3 (176.67 g) but it was similar to control ration (164.25 g).

Weight of the muscle Biceps femoris was higher in the carcasses of animals in ration 3 (625.75 g).

4- Carcasses of animals in ration 3 recorded the highest dissected lean meat 931.70 g and fat 280.55 g in rib cut, but no significant differences were registered for dissected bone weight among the different rations.

5- Mean weights of separated fat of carcasses were higher for animals of the 2 and 3 rations (1.93 and 1.95 Kg respectively) in comparison with animals of other rations but these rations were similar to the control ration 2.08 Kg.