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Articles by A.Y. Abdullahi
Total Records ( 4 ) for A.Y. Abdullahi
  A.Y. Abdullahi and J.B. Yang
  This study was aimed to assess a potentiality of milk production for a recently established dairy farm. A total of 201 Chinese Hesitan cows and 21 calves were raised in stall feeding system. The cows were respectively divided into area A (lactating only), B (late pregnant only), C (early pregnant only) and D (calves only). The study period lasted for 60 days which initially involved only 19 lactating cows and ended with 102 lactating cows. Physical observation of daily milk collection (twice daily); routine feeding and management operations had been maintained throughout the period of the study. Purposive or judgment sampling technique was employed. Sample of milk was collected for laboratory analysis at the beginning, middle and end of the study to determine its composition in terms of milk fat and solid not fat percentage. Data collected were collated and analyzed using Microsoft Excels 2007 for simple descriptive statistics and application of computer packages SSPS 17 for analysis. The total milk yield for the period of 60 days for the study was 43177.7 kg. The average milk yield was 719.63 kg while the milk sold was 38,578 kg. The relationship between the daily milk production and the number of lactating cows showed that the observed data values have strong relationship with the quadratic model-predicted value. The study result revealed that the BW average was 482 kg and BCS means for lactating and dry cows was 2.98 while calving weights for calf male and female were 37.69 and 33.60, respectively. Milk nutrients composition of milk fat, milk protein, lactose and DM means were 3.85, 3.59, 4.54 and 12.57, respectively. The correlation between the concentrate, the forage fed to the lactating cows and the feed efficiency dry matter intake indicated that there was a significant relationship (p<0.01). It was recommended that silage should be included in the feeding system because it contains qualitative nutrients.
  W.G. Xia , A.Y. Abdullahi , J.J. Zuo , L. Chen and D.Y. Feng
  Nine hundred, 42 days old male yellow-feathered broilers were used to evaluate the effects of Creatine Monohydrate (CMH) on growth performance, carcass characteristics and meat quality. The birds received either a no-CMH diet (0 mg kg-1) a low (250 mg kg-1), a moderate (500 mg kg-1) or a high-CMH diet (1000 mg kg-1) for 21 days. CMH supplementation did not affect the average daily weight gain, average daily feed intake or feed efficiency. Additionally no significant differences were discovered in the dressing, eviscerated, breast muscle or thigh muscle percentage. However, there was a decreasing trend in the pH values of the pectoralis major at 24 h postmortem and of the thigh muscle at 45 min postmortem as the level of CMH supplementation increased. No significant difference was observed in cooking loss, shear force value, moisture or crude protein percentages. However, supplementing with CMH increased the slow-twitch red and the fast-twitch white fiber ratio in the gastrocnemius muscles. The results suggested that CMH supplementation has no effect on growth performance or carcass characteristics but it potentially triggered a transition from fast-twitch red muscle fibers to slow-twitch red and fast-twitch white muscle fibers.
  J.J. Zuo , W.G. Xia , J.H. Liu , A.Y. Abdullahi , L. Chen , M.H. Xia and D.Y. Feng
  The object of the study was to investigate the effects of Creatine Monohydrate (CMH) supplementation on glucose absorption, glucose oxidation and glycogen synthesis in skeletal muscle of broilers. Nine hundred, 42 days old broilers were randomly assigned to four treatments with five replicates per treatment and 45 birds per replicate. The birds received either a no-CMH diet (0 mg kg-1), a low (250 mg kg-1), a moderate (500 mg kg-1) or a high-CMH diet (1000 mg kg-1) for 21 days. The results showed that CMH supplementation did not affect serum glucose concentration but did increase lactate concentration (linear and quadratic, p<0.001) as CMH supplementation increased. The concentration of lactate in pectoralis major showed a quadratic effect (p = 0.036) in response to increasing CMH supplementation. For the thigh muscle, the concentration of lactate presented a decreasing effect (linear, p = 0.042). Pyruvic acid in the pectoralis major increased markedly (linear, p<0.004; quadratic, p<0.003) with increasing CMH comcentration but an opposite effect to that in the thigh muscle. The HK1 mRNA abundance in the pectoralis major was decreased by CMH supplementation (linear and quadratic, p<0.001) but the HK1 mRNA abundance in the thigh muscle was increased with a quadratic effect. CMH supplementation had increased Lactate Dehydrogenase (LDH) activity in pectoralis major (linear, p = 0.003; quadratic, p<0.001) while no significant effect on thigh muscle as CMH concentration increased. Thus, it was inferred that CMH supplementation may improve glucose oxidation with distribution difference in skeletal muscle. Additionally, CMH supplementation had no effect on the Glycogen Synthase (GYS), Glucose Transporter 1 (GLUT1) and Glucose Transporter 3 (GLUT3) mRNA abundance, macroglycogen or total glycogen concentration of the breast and thigh muscles. CMH supplementation significantly increased the AMPKα phosphorylation of the pectoralis major and demonstrated a quadratic effect (p = 0.002) as CMH supplementation increased. CMH supplement did not affect the AMPKα phosphorylation of the thigh muscle but presented the same effect as the pectoralis major. The results suggested that CMH supplementation did not affect glucose uptake and glycogen storage of skeletal muscle but it accelerate the glucose oxidation in the thigh muscle or decelerate glycolysis in the pectoralis major, possibly regulated by AMPKα phosphorylation.
  A.Y. Abdullahi , J.J. Zuo , H.Z. Tan , W.G. Xia , S. Wei , J.H. Liu , Q. Ai , S.Y. Zhao , M.H. Xia , Y.H. Liu , C.D. Xia , F. Wu , J.P. Yu and D.Y. Feng
  Six hundred and forty, 1 day old Yellow feather broiler chicks were fed wheat-corn soybean diet plus xylanase ENOLZYMETM 100 g ton-1 (enzyme activity = 1256.244 U mL-1) to study additive effect of the enzyme on serum glucose and IGF-1 concentration relative to performance. The birds were randomly divided into 2 treatment groups with 64 birds/pen in 5 replicates. For the periods of 63 days body weight, feed efficiency and daily feed intake were not differed at 21 and 42 days. However, they were all differ significantly at 63 days (p<0.05); particularly feed efficiency from 1-63 days was highly significant (p<0.01). Carcass characteristics were not differed in all three stages but at finishing stage breast and thigh muscles, heart, gizzard and abdominal fat weights were numerically increased. Mortality rate was <0.02%. Serum glucose concentration levels at three feeding phases were not differed among groups. However, serum IGF-1 differ significantly at starter phase (21 days) (p<0.05). Correlation between treatments and feeding periods existed at growing (42 days) and finishing (63 days) stages (p<0.05). The present findings on supplementation of xylanase to corn wheat soy bean broiler diet hasincreased market weight cost value by 1.33% at finishing stage (43-63 days). The serum glucose and IGF-1 concentration have correlated positively on treatments offered, feeding periods and performance. Further research is needed on IGF-1 and GH (Growth Hormone) at molecular level to understand their influence in broiler’s growth and development.
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