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Articles by Hafiz A. Ibrahim
Total Records ( 2 ) for Hafiz A. Ibrahim
  M.A. Abouheif , M.Y. Al-Saiady , A. Aziz Makkawi , Hafiz A. Ibrahim and M.S. Kraidees
  Twenty-four Najdi ram lambs, weighing an average of 24 kg and circa 3 months old were utilized in this trial to evaluate the effect of two feeding frequencies on growth performance, carcass characteristics, digestion coefficients, nitrogen retention and ruminal VFA and ammonia-N concentrations. The feeding protocol involved once daily feeding at 0800 h and twice daily feeding in two equal portions at 08:00 and 15:00 h lambs were offered a sufficient quantity of total daily DM (95 g DM day-1 w0.75) to resemble ad libitum consumption. All lambs were slaughtered after a 14 week feeding trial. Although, the results showed no significant effect of frequency of feeding on DMI, ADG, carcass weight, digestibility of DM, CP and ADF and N-retention, lambs fed one meal daily had higher (p<0.05) gain efficiency and NDF digestibility and lower (p<0.05) dressing percentage than lambs fed two meals daily. Rumen total VFA concentrations at all post-feeding intervals were not influenced (p>0.05) by feeding frequency, except at 10 h post-feeding; rumen VFA concentration value at 10 h post-feeding was higher (p<0.05) in lambs fed once daily than those fed twice daily. Feeding once daily resulted in a greater (p<0.05) molar proportion of propionate and a smaller (p<0.05) molar proportion of acetate than from feeding twice daily. The ruminal fluctuations in total VFA and ammonia-N concentrations were less obvious in the lambs fed twice daily than once daily.
  Mohamed A. Abouheif , Mohamed Y. Al-Saiady , Saud I. Al-Mufarrej , Aziz Makkawi , Hafiz A. Ibrahim and Riyadh S. Aljumaah
  Twenty four Najdi ram lambs, weighing an average of 42.0+0.6 kg were utilized in this experiment to evaluate the effects of various alfalfa hay particle lengths in the diets and frequency of feeding on nutrients digestibility, ruminal retention time, total mean retention time and transit time. Lambs were randomly placed in a 3x2 factorial arrangement of three dietary treatments: 9.5 and 14 mm diets where alfalfa hay was processed to 9.5 and 14 mm particle lengths, respectively mixed with 3 parts of concentrate and pelleted as total mixed ration and long hay diet where one part of loose alfalfa hay (17.8±2.4 cm) was offered in combination with 3 parts of only-concentrate pellet and two feeding frequencies: once daily feeding at 0800 h and twice daily feeding in two equal portions at 0800 and 1500 h. All dietary treatments were homogeneous in their ingredient composition. Altering the particle length of alfalfa hay in diets did not affect the digestibility of DM or CP whereas digestibilities of ADF and NDF and ruminal retention time were 4.2 and 5.3% units higher (p<0.05) and 6.3 h longer (p<0.05), respectively for the long hay diet versus the 9.5 mm pelleted diet. The total mean retention time for the long hay diet was longer (p<0.05) at 63.1 h compared with the 9.5 and 14 mm diets. Lambs fed once a day had higher (p<0.05) NDF digestibility and 4.9 and 3.8 h longer (p<0.05) ruminal and total mean retention times, respectively than lambs fed twice daily. On the other hand, neither particle length of the alfalfa hay nor frequency of feeding had affected (p>0.05) the lower tract retention time and transit time.
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