The Effect of Different Dietary Energy Levels on Performance, Carcass Characteristics and Meat Quality of the Sudan Baggara Cattle.

الموضوعات

طب

الملخص

AbstractGrowth and degradation trials were conducted using Western Baggara cattle to study the effect of dietary energy levels on live animal measurements, feedlot performance, carcass characteristics and meat quality. Forty-eight entire bulls were employed in the feeding trials for 70 days. Bulls were stratified according to body weight into four groups, which were then allotted randomly to four dietary treatments The first group was given the experimental diet A with 11.5 MJ /kg energy concentration, while the second, third and fourth groups were given diets B, C and D which contained 10.5, 9.5 and 8.5 MJ/kg dietary energy, respectively. Animals were maintained on a sorghum stover diet in the pre experimental period. The experimental diets were introduced gradually and full replacement of sorghum stover took place after 12 days. The results indicated that live animal measurements such as heart girth, barrel circumference, height at withers and height at hip for bulls fed 11.5 MJ /kg 105. MJ /kg and 9 .5MJ /kg dietary energy were significantly (P < 0.05) higher than those fed 8.5 MJ /kg dietary energy. Back length, neck length and body length were the same for bulls raised on the different experimental diets. It was observed that dry matter intake, rate of body weight gain and feed conversion ratio were significantly {P < 0.05} superior for bulls offered 11.5, 10.5 and 9.5 MJ /kg dietary energy than those offered 8.5 MJ/kg dietary. No significant difference (P < 0/05) was observed in these parameters between 11.5, 10.5 and 9.5 MJ /kg dietary energy groups. The regression of energy intake on average gain was obtained. Maintenance energy requirement was estimated by extrapolation to zero gain as 0.59 MJ/Kg ME/W 0.75. It was observed that the dry matter of experimental diet A, 11.5 MJ/kg; B, 10.5 MJ/kg and C, 9.5 MJ/kg were degraded better than experimental diet D of 8.5 MJ/kg, while the experimental diet C, 9.5 MJ/kg was degraded to the greatest extent. The crude protein disappearance in diet D of 8.5 MJ/kg was greater than in diets A of 11.5, B of 10.5 and C of 9.5 MJ/kg dietary energy. The results indicated that bulls offered 8.5 MJ/kg. dietary energy had heavier head, hide and four feet, while bulls fed 11.5, 10.5 and 9.5 MJ/kg.dietary energy had heavier intestines, stomach, liver, lungs, diaphragm, oesophagus and omental an mesenteric fat. Bulls fed 11.5, 10.5 and 9.5 MJ/kg dietary energy produced heavier carcasses and yield higher dressing percentages. The area of longissmus dorsi muscle and back fat thickness were greater in bulls fed 11.5, 10.5 and 9.5 MJ/kg dietary energy than those fed 8.5 MJ/kg. Loin composition showed that bulls fed 11.5, 10.5 and 9.5 MJ/kg dietary energy had higher muscles, fat and kidney fat, while bulls fed 8.5 MJ/kg dietary energy had significantly (P<0.05) higher bone and trimmings. Positive correlation coefficients between final body weight and heart girth were obtained. Medium correlation coefficients were found between cold carcass weight and carcass length and hindquarter circumference while low correlation coefficients were found between cold carcass weight and carcass circumference at barrel. Generally, those results showed that correlation coefficients were higher for bulls carcass offered 11.5, 10.5 and 9.5 MJ dietary energy than those offered 8.5 MJ/kg dietary energy. High positive correlation coefficients were obtained between final body weight and hot carcass, cold carcass and circumference at chest and hindquarter circumference while medium correlation coefficients were found between final body weight and carcass circumference at barrel. Chemical analysis indicated that bulls offered 11.5, 10.5 and 9.5 MJ/kg dietary energy had higher percentage of fat, sarcoplasmic protein and non-protein nitrogen (P<0.05) than those offered 8.5 MJ/kg dietary energy. Panelists indicated that beef of bulls given 11.5, 10.5 and 9.5 MJ/kg dietary energy had better colour, was juicier, more tender and more acceptable than beef of bulls given 8.5 MJ dietary energy. Shear force and connective tissue strength were also lower in bulls given the high energy diets of 11.5, 10.5 and 9.5 MJ than those given the low energy diet of 8.5 MJ/kg.

روابط وملفات

التعريف والنوع

رقم الوثيقة

0b751a74-8a45-4784-8041-ffe0c88d1f71

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1623307_1.pdf

بيانات النشر

ألقاب المؤلفين

[{"name_ar":"Salih Ahmed Babiker","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"Suliman Hassan Khogali Mohamed","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

English

المصدر والدورية

اسم المصدر

The Effect of Different Dietary Energy Levels on Performance, Carcass Characteristics and Meat Quality of the Sudan Baggara Cattle.

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

Salih Ahmed Babiker

الإعداد

Suliman Hassan Khogali Mohamed

الاقتباسات الببليوغرافية