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Articles by S.Z. Ali
Total Records ( 3 ) for S.Z. Ali
  V. Singh and S.Z. Ali
  Starches from cereals (maize, wheat, rice, sorghum, finger millet, waxy rice), pulses (green gram, chick pea) tuber (potato and root (tapioca) were converted to non-granular form and hydrolysed in a homogenous phase. In vitro hydrolysis by α-amylase at 37 °C for 5 to 30 min was carried out and the same starches were also modified with 0.5 N HCl at 37°C for 0.75 to 3 h. Molecular weight of the starches decreased to 7-35% of the respective initial values at the end of 5 min and down further to 3-15% at the end of 30 min. Acid hydrolysis in comparison was very slow. At the end of 3 h, of the resultant starches was still 18-70% of their initial . Degradative pattern of 20 min enzyme hydrolysed starches was studied by gel permeation chromatography on Sepharose CL-6B column. The carbohydrate content of the Fraction-I (void volume, Fr-I) decreased from 81 to 21% after hydrolysis and that of Fraction-II (Fr-IIA and Fr-IIB) increased. The increase was more (from 4.9 to 43.4%) in Fr-IIB (towards total volume). The in the peak of this fraction had a range of 2 x 103 to 9 x 103 indicating that the enzyme hydrolysis in non-granular state produced very low molecular weight dextrins in comparison to granular hydrolysis. The resistance for enzyme hydrolysis, in descending order was found to be finger millet, potato, chickpea, rice, sorghum, green gram, wheat, tapioca, waxy rice and maize. The λmax of iodine complex of enzyme hydrolysed fractions was low in comparison to their respective native fractions. Maximum drop of >100 nm was noted in Fr-IIA, which had comparatively higher values for their respective native fractions indicating that hydrolysed product had many branch points. The higher λmax for peak of Fr-IIB indicated that carbohydrate content corresponding to this peak represented long linear chain fraction probably coming from external chains of the amylopectin molecule.
  P.K. Das , S.Z. Ali , A.B.M.M. Islam and B.K. Roy
  The study was conducted at Baghabarighat milk pocket area to observe the productive and reproductive performance of the crossbred of Sahiwal x Friesian, Sahiwal x Pabna, Friesian x Pabna and Pabna x Pabna during the period from 1990 to 1998. Comprising four genetic groups data of 41 Sahiwal x Friesian, 72 Sahiwal x Pabna, 55 Friesian x Pabna and 18 Pabna x Pabna were considered to evaluate birth weight of calves, age at puberty, gestation length, service per conception, post partum heat period, lactation length, and daily milk yield. Five Sahiwal and four Friesian sires were used for the crossbreeding. The exotic sire effect of individuals on their daughters were also evaluated in this study. Statistical analysis of the results showed that the genetic group had a significant effect on birth weight (P<0.001), age at puberty (P<0.001), post partum heat period (P<0.01), lactation length (P<0.01) and daily milk yield (P<0.001). But genetic group had no significant effect on gestation length and number of services per conception. The performance of SL x F cows with regard to birth weight of calves (26.35±0.35 kg), age at puberty (25.21±0.55 months), lactation length (260.38±4.48 days) and daily milk yield (10.56±0.14 litres), was found to be better among the other genetic groups. The best performance for the trait service per conception (1.29±0.13) and post partum heat period (104.82±6.53 days) was observed in Pabna x Pabna cows. F x Pabna grades had a slightly shorter gestation length (280.59±0.91 days) than the other genetic groups. So it can be concluded that SL x F crossbred are well ahead to other genetic groups in respect of productive aspect, whereas F x Pabna crosses show the remarkable performance both for production and reproduction. Under this consideration the F x Pabna grades ranked first in over all merit followed by SL x F, SL x Pabna and then Pabna x Pabna cows. Individual sire effect was found significant on birth weight (P<0.05) and average daily milk yield (P<0.05) in SL x F genetic group, on birth weight (P<0.05), age at puberty (P<0.05) and lactation length (P<0.05) in SL x Pabna genetic group and on lactation length (P<0.05) and average daily milk yield (P<0.05) in F x Pabna genetic group. The pooled estimates of heritability for birth weight, age at puberty, gestation length, service per conception, post partum heat period, lactation length and daily milk yield were 0.44±0.30, 0.14±0.17, 0.25±0.21, 0.03±0.12, 0.33±0.26, 0.46±0.33 and 0.43±0.27 respectively. In this study the h2 estimates of reproductive traits were found lower than that of productive traits which indicate that these traits are mostly influenced by managemental factors rather than genetic variability.
  P.C. Goswami , S.Z. Ali , M.A.M.Y. Khandoker , S.A. Azmal , M.K. Alam and R. Khatun
  The research was carried out at the Animal Breeding and Genetics Laboratory under the Department of Animal Breeding and Genetics, Bangladesh Agricultural University, Mymensingh, Bangladesh. It was conducted with a view to establish some relationship between ovarian condition in terms of the presence or absence of corpus luteum and morphological quality of the COCs as well as the relationship between follicular diameter and quality of COCs. Significantly highest (p<0.01) number of follicles was found in type III ovaries. The number of follicles measuring 2-6 mm diameter was observed to be significantly higher (p<0.01) in type III than type II and type I ovaries. Moreover, grade A and grade B COCs were significantly highest (p<0.01) in number in 2-6 mm diameter follicles. It was established that cumulus cells surrounding the oocytes favour to a less or greater extent the IVM (In vitro maturation), IVF (In vitro fertilization) of oocytes and subsequent IVC (In vitro culture) of zygotes. On the basis of the study, it is concluded that type III ovaries having no corpus luteum may be suggested for obtaining good quality Cumulus-oocyte-complexes (COCs) in experiment for IVM, IVF and subsequent IVC.
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