Effect of feeding rations containing graded levels of biologically treated wheat straw on carcass characteristics and some blood parameters of growing lambs

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Abstract: Twenty-four Rahmani lambs with average body weight. 14.00±0.30 kg and six months old were used in this study. Lambs were distributed into four groups (6 lambs each). Animal groups were fed the four respective rations as follows: first (R1) was the control group fed hay and concentrate feed mixture (CFM), R2, R3 and R4 replaced 25, 50 or 75% of CFM protein with wheat straw treated with fungus, the experiment extended for 180 days. Animals were weighed monthly to calculate weight gain, daily weight gain and feed efficiency. Blood samples were taken from three animals of each group to evaluate the liver and kidney functions. After the end of the feeding trial the animals were fed the same rations for each group until the animals reached the common market weight (40 kg in average). Thereafter, three lambs from each group were chosen randomly and slaughtered to study the carcass characteristics. The data revealed that the final weight was higher in the control than the treated groups, while, no significant differences (P>0.05) were found between treated groups in total and daily weight gain Dry matter intake was slightly increased by increasing the proportion of the treated wheat straw in the ration. On the other hand, better feed efficiency (kg DM/kg gain) was recorded for groups fed rations containing either 25 or 50% treated wheat straw compared to those fed 75% while, the lambs fed control ration had the best feed efficiency. Abdominal fat and edible offalls weight significantly differed among groups, while animals in R3 group showed the highest abdominal fat weight (0.90 kg). Shoulder and hind quarter; weights did not differed significantly (P>0.05) among the groups. Also, no significant differences were found in respect of lion, rack, brisket, flank and weight among the groups However, lambs in R3 group showed the highest lion; and brisket neck Weight while the smallest cut weight recorded in the R4 group Dressing percentage (relative to fasting weight) was significantly different among the groups. Lambs from the control group showed the highest dressing percentage, while lambs from the R3 group had higher dressing percentage as compared to other treated groups. Physical characteristics of best ribs (9-10 and 11) showed the highest fat content in the control group while. the lean percentages was lower in control than in the R4 group. The boneless meat percentage (lean + fat weight) was significantly different among the groups. R4 group showed higher value than the other groups. The chemical composition of meat showed that there were significant. differences among the treatments in ether extract (EE), crude protein (CP) and ash content. Lambs from the R2 group had the highest value of EE, and lowest value of CP in meat samples Also, blood serum values of total proteins, albumin and globulin' were significantly affected by the treatments while, no significant differences were found among the different treatments in respect of ALT, AST activity and creatinine content.
Keywords: biological Treatment, carcass characteristics, blood parameters and lambs

Publication year

2008

Pages

469-479

Availability location

معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة

Availability number

Organization Name

Animal Production Research Institute (APRI)

serial title

Egyptian Journal Nutrition and Feeds

ISSN