Different level of dietary metabolizable energy and crude protein on fattening performance and fiber traits in Iranian Markhoze male kids.
2007
Ebne A`bbasi, Rahman | Faza`eli, Hassan | Akbari, Sa`id | Chavoshini, Khosru
This study was conducted to investigate the effect of metabolisable energy (ME) and crude protein (CP) on fattening performance and mohair characteristics of Markhoze male kids. Nine diets contained 8, 10 and 12 percentage of CP and 2.1, 2.3 and 2.5 Mcal/kgDM of ME were used in a completely randomised design with 3×3 factorial experiment, each with 6 replicates, using of 54 kids with live weight of 18.2± 3.4 kg for 12 weeks. The diets were prepared as total mixed ration and fed ad libitum two times per day. All kids were individually weight every month and at the end of the experiment half of the animals were slaughtered and carcass characteristics were measured. The average body weight of the kids were from 23.5 to 27.5 kg for different groups at the end of the experiment that was significantly (P0.05) varied among the diets. The interaction effects of ME and CP were statistically significant (P0.05) on the average daily gain (ADG), dry matter intake (DMI) and feed conversion ratio (FCR). In spite of the CP, the diets contained 2.5 Mcal ME resulted significantly (P0.05) the highest amount of ADG. The effect of energy was significantly (P0.05) different on the DMI and FCR. The effect of CP itself was significant (p0.05) on the ADG and DMI with the highest amount (70 g ADG and 830 g DMI) for 12% CP diet and the lowest amount (58 g ADG and 770 g DMI) for the 8% CP diet. The FCR was also significantly affected by the CP levels in the diets(p0.05). The carcass weight and dressing percentage were significantly (p0.05) affected by the treatments with the highest amounts (12.4 kg and 45.2 % respectively) for the high ME and CP diets and lowest amounts (9.5 kg and 40.1% respectively) for low ME and CP diets. Other carcass traits such as lean meat weight and percentage were significantly (p0.05) affected by the diets. The mohair production and fiber characteristics were not varied among the treatments. In conclusion, the kids received diet contained 2.5 Mcal ME and 120 g CP per kg showed the highest amounts of ADG (104 g) and lowest FCR (8.67) with the best carcass efficiency.
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