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Articles by M. Zahedifar
Total Records ( 3 ) for M. Zahedifar
  H. Kioumarsi , K. Jafari Khorshidi , M. Zahedifar , A.R. Seidavi , S.Z. Mirhosseini and M.R. Taherzadeh
  In this study, two levels of Metabolizable Energy (ME) (2.3 and 2.5 Mcal kg-1 DM) and three levels of Crude Protein (CP) (12, 14 and 16%) and their interactions were studied to identify the optimum levels of dietary energy and protein for lambs of the Taleshi breed. The growth performance variables measured included Average Daily Gain (ADG), final weight, Daily Dry Matter Intake (DDMI, kg day-1) and Feed Conversion Ratio (FCR) whilst other commercially important factors were assessed during specific periods. The urea dilution method was used for predicting the body composition of live lambs. At the end of the experiment, all animals were slaughtered, the carcasses were cut and the chemical composition of the area around the 9th, 10th and 11th rib was measured. The study comprised a completely randomized design with a 2x3 factorial arrangement with four replications per diet. The results showed that the energy and protein levels had a significant effect (p<0.05) on growth. The diet with 2.5 Mcal ME kg-1 and 14% CP was associated with the best final weight, ADG, FCR, feed cost kg-1 gain, un-variable profit kg-1 live weight, un-variable profit/total gain, carcass weight, shoulder weight, thigh weight and ribeye area (REA). A high dietary energy level helps to produce more ME and fermentable products for paunch microorganisms resulting in an increase in the synthesis of microbial protein and therefore the amount of protein available to the animal. Increasing the dietary protein level causes a change in the process of fermentation in the paunch whilst increasing fatty acid production and the ratio of propionate to fatty acids. These changes in the paunch improve the lamb`s energy balance allowing more nitrogen to be stored and increasing the body weight.
  H. Kioumarsi , K. Jafari Khorshidi , M. Zahedifar , A.R. Seidavi , Z.S. Yahaya , W.A. Rahman and S.Z. Mirhosseini
  This study estimated the relationship between Urea Space (US) and carcass attributes in lambs to derive coefficients for these relationships and functional equations for components of carcass quality and quantity. Twenty-four male Taleshi lambs with an average age of 8 months were used. Lamb live weight was determined using the urea dilution method and two or three days before slaughter, the urea dilution procedure was again used to estimate the chemical composition of the carcass. Subsequently, plasma urea nitrogen was determined and the percentage of urea space to lamb live weight was calculated. After slaughter, the carcasses were butchered and the parts measured. The results showed that the average amount of urea injected was 20.09 cm2 and the Blood Urea Nitrogen (BUN) averaged 17.16 and 27.72 mg before and after injection respectively. The average percentage of US to lamb live weight was 18.78%. Correlation coefficients between live weight, empty body weight, hot carcass weight and the weight of different parts of the carcass were high and statistically significant (p < 0.01). The urea space was significantly related to the percentage of protein and ash in the region of the 9th, 10th and 11th ribs (p < 0.05). Using this rib area and US, the development of functional equations between live weight and empty body weight for different parts of the carcass showed that the urea dilution test is a useful tool for predicting the chemical composition of Taleshi lamb carcasses.
  G.R. Shadnoush , M. Alikhani , H.R. Rahmani , M.A. Edriss , A. Kamalzadeh and M. Zahedifar
  About 48 Lori-Bakhtiari lambs were used to measure the effects of restricted feeding and re-feeding on intake, body weight and development of body organs. The feeding management was divided to Feed Restriction Period (FRP) and Re-alimentation Period (RAP). During FRP, the 18 Control (C) animals were fed a low-quality roughage, ad libitum and 40 g kg BW-0.75 day-1of concentrate and the 30 animals were only fed low-quality roughage as the Restricted (R) group. At the end of FRP and RAP, six lambs of each group were slaughtered. In the RAP, the 24 remaining lambs from restricted treatment were divided into two groups of R1 and R2 and received low-quality roughage plus 40 and 48 g kg BW-0.75 day-1, of concentrate, respectively. During FRP, Dry Matter (DMI), Metabolizable Energy (MEI) and Crud Protein Intake (CPI), Daily Gain (ADG), Final Body Weight (FBW), pelt, liver and kidneys of C group were higher (p<0.05) than R group. In the RAP all groups had similar FBW but feed conversion ratio, DMI, MEI, CPI and weights of all body organs of C group were higher (p<0.05), however ADG was lower (p<0.05) than R1 and R2 groups. In general, restricted feeding following re-feeding lambs caused more efficiency of performance which was associated with lower maintenance requirements.
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