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Articles by T. Dzenda
Total Records ( 4 ) for T. Dzenda
  J.O. Ayo , O.O. Owoyele and T. Dzenda
  Experiments were performed with the aim of determining the effect of Ascorbic Acid (AA) on diurnal fluctuations in Rectal Temperature (RT) of Bovan Nera pullets during the harmattan season. Thirty experimental pullets were administered AA orally at the dose of 60 mg kg-1, while 20 control birds were given only clean water. Measurements of RT were taken for three days from 07:00 to 18:00 hours during the season using a standard clinical thermometer, inserted through the cloaca into the rectum of each pullet. The overall mean RT of experimental and control pullets were 41.3±0.09°C and 41.3±0.06°C, respectively. The recorded RT in the experimental pullets was lowest at 07:00 hours with the value of 41.2±0.04°C and highest at 15:00 hours with the value of 41.5±0.04°C (p<0.001). In the control pullets, the lowest RT was also recorded at 07:00 hours with the value of 41.0±0.09°C, while the highest value of 41.5±0.07°C (p<0.05) was recorded at 15:00 hours. The RT in both experimental and control pullets rose significantly (p<0.05) and concurrently with the hour of the day (r = 0.668 and 0.457, respectively). The dry-bulb temperature was positively correlated with the RT of both experimental and control pullets (r = 0.991 and 0.948, respectively). The fluctuation in RT of the experimental pullets was 1.1±0.05°C, while that of the control was 1.3±0.08°C (p<0.001). The RT values of both the experimental and control pullets showed distinct diurnal fluctuations. It is concluded that AA administration to pullets ameliorated the thermally stressful effect of the harmattan season and may enhance their productivity and health during the season.
  J.A. Obidi , B.I. Onyeanusi , J.O. Ayo , P.I. Rekwot and T. Dzenda
  The objective of this study was to determine gonadal sperm/spermatid reserves in Shikabrown breeder cocks. Five cocks, each of Shikabrown White and Shikabrown Red, were slaughtered after one year of evaluation of seminal characteristics. To determine testicular integrity of the breeder cocks, left and right testes from each slaughtered samples were carefully dissected out of the abdomen and marked accordingly. Each testis weight, length and volume were measured, followed by the determination of gonadal sperm/spermatid reserves. The mean testicular lengths for Shikabrown White were 4.22 ± 0.03cm and 3.98 ± 0.04cm for the right and left testes, respectively; while that for Shikabrown Red were 4.40 ± 0.1cm and 4.44 ± 0.09cm for right and left testes, respectively. The mean testicular weight of Shikabrown Red cocks was significantly (P < 0.01) higher than that of Shikabrown White cocks (12.39 ± 0.76g and 10.23 ± 0.25g, respectively). The mean gonadal sperm/spermatid reserves (x 109 per ml testis) for the right testes in Shikabrown White and Shikabrown Red cocks were 57.6 ± 5.6 and 103.2 ± 22.3 (P < 0.01), respectively, while those of the left testes were 84.8 ± 18.2 and 209.4 ± 95.1, respectively. The left mean gonadal sperm/spermatid reserves in Shikabrown Red strain was statistically (P < 0.01) higher than Shikabrown White strain. This study suggests: I) that there are strain differences in testicular function of the breeder cocks and ii) that there are differences in spermatogenic capacity between the right and left testes in breeder cocks.
  J.A. Obidi , B.I. Onyeanusi , P.I. Rekwot , J.O. Ayo and T. Dzenda
  The seasonal influence on the seminal characteristics of Shikabrown breeder cocks was evaluated weekly during the three seasons in Northern Guinea Savannah zone of Nigeria. Semen samples were analyzed by gross and routine laboratory methods for volume, motility, concentration, colour, percent dead and percent total abnormality. The highest volume and concentration values of 0.50 ± 0.03ml and 3.60 ± 0.16x109/ml, respectively, were obtained from Shikabrown White breeder cocks during the rainy season, while the lowest volume and concentration values of 0.39 ± 0.01ml and 2.90 ± 0.04x109/ml, respectively, were obtained for the same strain during the hot-dry season. Spermatozoa motility of 80.5 ± 1.1% and 82.3 ± 0.5% were obtained during the harmattan and rainy seasons, respectively, in Shikabrown White breeder cocks. Percent dead sperm values of 4.6 ± 8.3% and 6.40 ± 0.5% were recorded during the rainy and hot-dry seasons, respectively; which were lower (P < 0.05) than the value of 9.0 ± 1.0% obtained during the harmattan season in Shikabrown White breeder cocks. For the Shikabrown Red breeder cocks, spermatozoa volume and concentration were 0.44 ± 0.02ml and 3.44 ± 0.05x109/ml; while 0.45 ± 0.05ml and 3.53 ± 0.09x109/ml.were recorded for the harmattan and rainy seasons, respectively. These values were significantly (P < 0.01) different from the corresponding values of 0.30 ± 0.02ml and 2.50 ± 0.08x109/ml obtained for volume and concentration, respectively, during the hot-dry season in the Shikabrown Red breeder cocks. Percent dead sperm in the Shikabrown Red cocks during the rainy and hot-dry seasons (5.50 ± 1.0% and 6.20 ± 1.2%, respectively) were not statistically (P < 0.05) significant, but were significantly lower (P < 0.01) than the value of 8.40 ± 0.5% obtained during the harmattan season. The ejaculate trait for percent abnormality in Shikabrown Red cocks was not significantly different from that of the Shikabrown White strains. In conclusion, spermatozoa were recovered throughout the year and optimal gamete quality was observed during the rainy and harmattan seasons.
  T. Dzenda , J.O. Ayo , C.A.M. Lakpini and A.B. Adelaiye
  Adult African giant rats (Cricetomys gambianus, Waterhouse) were live-trapped in Zaria, Nigeria over a period of three years, cutting across all the seasons of each year. They were sexed and weighed immediately after capture, with the aim of determining changes in their live weights with seasons and sex. The overall live weight (Mean±SEM) of the African giant rats was 1.21±0.01 kg (n = 363). The live weight of African giant rats captured during the rainy season (1.17±0.02 kg) was significantly lower than that during the harmattan (1.25±0.02 kg; p<0.01) and hot-dry (1.23±0.02 kg, p<0.05) seasons. The male live weight of 1.28±0.01 kg was significantly higher (p<0.0001) than that of the female (1.14±0.01 kg). Male-biased sexual size dimorphism was observed during all the seasons, but was highest during the hot-dry season. The seasonal variation in live weight may be because food was more available in the wild during the harvest (dry) seasons (harmattan and hot-dry seasons) than the planting (rainy) season. The relatively low ambient temperature and relative humidity of the harmattan season was more favourable to growth, which may account for the higher live weight recorded during the season. The sex variation in live weight may be as a result of differential growth rate/time between the sexes. In conclusion, the African giant rats are lightest during the rainy season and the live weight of the male is higher than that of the female regardless of the season.
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