فهرست مطالب

  • Volume:7 Issue: 1, 2020
  • تاریخ انتشار: 1399/02/13
  • تعداد عناوین: 2
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  • mujahed omar lutfi bushwereb*, A. Kerban, M. Elraghig, H. Sola Pages 1-8

    A total of 500 days-old Ross chicks with an average live weight of 53 g were used p to evaluate the effects of (Saccharomyces cerevisiae) backer yeast (BY) with or without Oxytetracycline (OTC) on the performance and nutrient digestibility of growing broiler chicks given contaminated aflatoxin (AFB1) basal diet. Birds were equally divided into five dietarytreatment groups. Each group had 100 birds in five replicates (cages) and was assigned to one of the five dietary treatments in a randomized complete block design experiment. Treatments consisted of a control group maize-soybean meal basal diet and four test groups with aflatoxin AFB1(1% of moldy rice), AFB1 + baker yeast BY (0.003g/kg), AFB1+OTC ( 2.4g/Kg), and AFB1+BY+OTCrespectively. Feed and water were provided ad libitum. Supplementation of BY and OTC or both BY+OTC was not statistically significant on feed intake between treatments during the 42 days experiment however, feed intake tended to be the lowest for the control group. Baker yeast and oxytetracycline added to the aflatoxin-containing diet significantly improved gain body weight; feed conversion ratio and digestibility of protein, fat and nitrogen-free extract efficiency, no significant differences were observed for fiber digestibility. Results of this research revealed that baker yeast as well oxytetracycline added to the aflatoxin containing diet improved the performance as well the digestibility of nutrients in broiler chickens. In general, The principal finding from this research is that the baker yeast (Saccharomyces cerevisiae) added to the aflatoxin contaminated diet in broiler diets could significantly relieve the negative effect of AFB1 on chicken's production performance and nutrient digestibility

    Keywords: Aflatoxin, baker yeast (Saccharomyces cerevisiae), performance, apparent digestibility, feed conversion ratio, gain body weight
  • Mona Ibrahim Abd elgawad*, Hanaiya A. ElItriby, Hassan M. Sobhy, Btissam H.A. Hussein Pages 9-27

    StandardizedkaryotypingbyGTG-bandingtechniqueandphysicalchromosome mapping by Fluorescentin Situ Hybridization (FISH) wereutilized to characterize the three Egyptian breeds of sheep (Barki, Rahmaniand Ossimi). Blood samples were collected from 15 individuals from eachbreed of sheep. G-banded chromosomes revealed that the karyotypemacrostructure was highly conserved and in considerable accordance to thestandard karyotype of theOvis aries. The chromosome diploid number was54 (2n=54, XX / XY). The karyotype formula was 2n, 54 = Lm6 + Ma22 + Sa24+ sex chromosomes. Physical chromosome mapping of the three breeds(Barki, Rahmani and Ossimi) was carried out by localization of twosubtelomeric SSR and two (SPRN) related specific sequences. The twosubtelomeric SSR sequences revealed six different loci in fivechromosomes (1p37, 1p36 and 17q26 with the EPCDV008 probe) and (2q45, 4q22 and 24q24 with the EPCDV016 probe), respectively. In addition, the two (SPRN) related specific sequences were successful in differentiating among the three breeds. The probe OriaBAC273H7hybridized to a similar locus (20q13) in breeds Rahmani and Ossimi, while,in Barki, it hybridized to a different locus (22q24). However, probeOriaBAC265G4 hybridized to three different loci (17q25, 22q24 and20q13) in Barki, Rahmani and Ossimi, respectively.

    Keywords: Ovis aries, Sheep, Chromosomes, Karyotype, GTG-banding, FISH