Age and sex specific brain biometrical study in Vanaraja chickens

The objective of this study was to evaluate the brain biometrical dynamics with advancement of age between sexes. One hundred fifty day-old sexed Vanaraja chicks (75 male + 75 female) were selected and distributed equally in two groups. Birds were slaughtered by cervical dislocation method at 21, 42, 63 and 84 days of age and biometrical measurements were taken. From our present study we observed brain volume had shown significant (P>0.05) changes with respect to age and sex of birds. The mean length of both left and right cerebral hemispheres between male and female birds had varied significantly (P>0.05). With advancement of age, hemispheric length varied significantly (P>0.05). The major finding was that cerebral width significantly (P>0.05) increased from 42-63 days of age and in male birds cerebellar length increased from 63 days onwards. There were age-specific changes in all the morphometrical parameters where as between sexes there were some minor variations.

PHENOTYPIC CHARACTERISTICS AND BIOMETRICAL STUDY ON DIFFERENT BREEDS OF PIGEON IN NORTHERN BANGLADESH

The experiment was conducted to characterize different breeds of pigeon phenotypically and to study their body biometry, which are available in the northernBangladesh. During this study 30 farms were selected which have >20 pair of pigeons in the three study area namely Rajshahi, Natore and Pabna districts ofBangladesh. There about 15 breeds have been selected for the observation of phenotypic characteristics such as color of bill, eye, eyelid, skin, shank, toe, egg, head feather, neck feather, body feather, down feather, wing feather, tail feather and shape of bill, body and egg. The biometrical data were collected from the measurement of length of bill, head, body, shank, middle toe, wingspan and mature body weight. In this study the highest mean bill length was found 2.83±0.05cm in Strasser and lowest mean head length 5.00±0.00cm in Kormona, Nun and Jacobin. The highest mean body length was found 41.60±0.38cm in Strasser and lowest mean body length 30.00±0.43cm in Owl. The highest mean wingspan was found 81.00±0.51cm in Jacobin and lowest mean wingspan 60.45±0.76cm in kormona. The heighest mean shank length was found 3.40±0.13cm in Homer and lowest mean shank length 2.50±0.00cm in Giribug, Kormona, Nun, Satinette and Suachandan. The heighest mean middle toe length was found 4.40±0.05cm in pouter and lowest mean middle toe length 3.00±0.00cm in kormona. The heighest mean mature body weight was found 748.20±8.96gm in Strasser and lowest mean mature body weight 265.10±7.03gm in Giribug. Phenotypic correlation among bill length, head length, body length, wing span, shank length, middle toe length and mature body weight of these breeds of pigeon ranged from 0.233 to 0.789. The experiment’s result may contribute to breed up gradation, helps to formulate the conservation and improvement strategies for the breed as genetic resource.

Fine structure of the spermatozoon in three species of Cambaridae (Arthropoda: Crustacea: Decapoda)Cambarus robustus,Orconectes propinquusandOrconectes rusticus: a comparative biometrical study

The ultrastructure of spermatozoa in three species of cambarid crayfish,Cambarus robustus,Orconectes propinquus, andOrconectes rusticus, were studied and compared with eight previously studied species from different crayfish families using morphological features and biometrical data. The ultrastructure of spermatozoa show a generally conserved pattern including an acrosome and nucleus in the anterior and posterior parts of the cell, respectively, radial arms that wrap around the nucleus, and the whole cell is enclosed by an extracellular capsule. The most outstanding morphological feature in spermatozoa of three studied cambarid crayfish is the crest-like protrusions in the anterior part of the acrosome that can be used as one of the features for distinguishing the members of this family. Results of biometrical data reveal that acrosome size in the representatives of Parastacidae are the smallest, while representatives of Astacidae show the biggest acrosome. The acrosome size in species belonging to Cambaridae occupy an intermediate position between the two other families of freshwater crayfish. In conclusion, a combination of morphological features and biometrical data of spermatozoa can help distinguishing different species of the freshwater crayfish.

Biometrical Study Of Brine Shrimp (Artemia franciscana) With Special Emphasis On Hatching Efficiency And Hatching Percentage In Tropical Condition At Bangladesh

The present study was carried out to investigate the hatching efficiency and hatching percentage of untreated and decapsulated cysts of Artemia franciscana at three salinities; 30 ppt, 35 ppt and 40 ppt. This study revealed that the hatching efficiency and hatching percentage were higher in case of decapsulated cysts. First hatching of nauplius from cysts were observed after 14 hours and 13 hours of incubation for untreated and decapsulated cysts, respectively. The values of hatching efficiency and hatching percentage were also higher at 35 ppt in untreated and decapsulated cysts. At 35 ppt, the hatching efficiency after 48 hours of incubation was 1.42× 105 for decapsulated cysts and the value for untreated cysts was 8.96× 104 nauplii per gram cysts. After 96 hours of incubation, the hatching percentage for decapsulated cysts were 75%, 89% and 90% at 30 ppt, 35 ppt and 40 ppt, respectively; and the values were 55%, 62.5% and 60% for untreated cysts at respected salinities, 30 ppt, 35 ppt and 40 ppt. The mean diameter for untreated and chorionic cysts were 242.2±1.90 µm and 213.5±3.167 µm respectively, with a chorionic thickness of 14.35 µm. This study would help the hatchery managers to understand the efficiency of larval live feed, since adequate data are lacking on the hatching performances of Artemia cysts in Bangladesh.

Biometrical study of some individuals chosen from Pinus mugo turra populations in the peat bog "Bór na Czerwonem"

Sixteen individuals were sampled for study of variation in 17 anatomical and morphological characters. Only individuals of low polycormic growth (trait typical for <i>Pinus mugo</i> Turra) connected with incurved one-year-cone stipes (a similar situation exists in <i>Pinus sylvestris</i> L.) were chosen, thus the sample studied cannot be treated as a random one. It has been shown by multivariate statistical analysis that these 16 individuals are quite different from each other, Mahalanobis'generalized distances between them being nearly 50% significantly different from 0. The sample studied in this respect is distinctly different from pure stands of both putative parental species (i.e. <i>Pinus mugo</i> and <i>P. sylvestris</i>). Every plant studied shows a different combination of traits typical (or nearly typical) for both the above-mentioned species and traits that are truly intermediate between them. The results support the frequently expressed opinion that the mountain pine population from the peat bog "Bór na Czerwonem" is, in fact, a hybrid swarm formed by hybridization between <i>Pinus mugo</i> and <i>Pinus sylvestris</i>.

MRI-biometrical study of intracranial CSF spaces in fetuses with different CNS pathology

The retrospective analysis prenatal magnetic-resonance investigation with cerebrospinal fluid (CSF) biometry in control group and in cases of different fetal brain pathology have been done. Ventriculomegaly prevalence, grade and asymmetry were established. Depicted peculiarities of CSF spaces relations showed to be distinctive for different groups of brain pathology.