black bengal goat

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1 - Estrus Characteristics of Black Bengal Does Under Intensive Condition
M. Fakruzzaman Q.S. Akter S.S. Husain M.A.M.Y. Khandoker A.S. Apu M.R. Islam

The present study was carried out to investigate the effect of different seasons on length and duration of estrus as well as to observe the behavioral changes and physiological peculiarities during estrus period. Three climatic seasons and age groups were considered: su أکثر

The present study was carried out to investigate the effect of different seasons on length and duration of estrus as well as to observe the behavioral changes and physiological peculiarities during estrus period. Three climatic seasons and age groups were considered: summer (March-June), rainy (July-October) and winter (November-February); A (6-9 month), B (9-12 month) and C (>12 month). Estrus behavior was monitored twice a day, using a teaser buck. The estrus were quantified within each season and classified as short (25 days). In case of seasonal effect, the length of estrous cycle did not differ significantly (P>0.05). The higher length of estrous cycle was found in summer (23.50±1.57 days) followed by winter (21.33±1.01 days) and rainy season (20.79±0.61 days), respectively. On the other hand, duration of estrus showed significant (P≤0.05) differences among the three different seasons. The longer duration was observed in winter (44.00±1.95 hours) followed by summer (36.00±0.70 hours) and rainy season (35.54±0.80 hours), respectively. Higher percentage of normal estrus was observed during rainy season (79.31%) when compared to winter (72.73%) and summer (53.33%). On the other hand, a greater percentage of short and long estrous cycle was reported in summer followed by winter and rainy season. Moreover, length of estrus and its duration did not differ significantly (P>0.05) with age. The mean of rectal and vaginal temperature during estrus were recorded as 39.30±0.05 °C and 39.60±0.03 °C, respectively. However, seasonal variation on post-partum heat period did not differ significantly (P>0.05). The mean post-partum heat period of Black Bengal does among the seasons was observed as 84.56±3.28 days. The present result on estrus behavior of Black Bengal goat could help to boost up effective artificial insemination of goat population for optimizing productivity under intensive condition. تفاصيل المقالة

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2 - Preliminary Study on Productive and Reproductive Performances of Jamunapari, Black Bengal and Crossbred Goats at Chittagong Region of Bangladesh
ان. بومیک ام.ا م. میا ام.ام. رحمان اس. اسلام

The present study was conducted with a view to know the productive and reproductive performance of Jamunapari, Black Bengal and crossbred goats in Chittagong district during the period of May to December 2012. The data on productive and reproductive traits were collecte أکثر

The present study was conducted with a view to know the productive and reproductive performance of Jamunapari, Black Bengal and crossbred goats in Chittagong district during the period of May to December 2012. The data on productive and reproductive traits were collected from 324 goats as a whole. In the present study, the birth weight of Jamunapari goats was higher than other crosses. The adult weight of Jamunapari, Black Bengal and crossbred bucks and does were 50.70 ± 3.53, 24.27 ± 1.67 and 40.38 ± 2.90 kg and 45.47 ± 3.78, 21.06 ± 2.33 and 35.72 ± 2.97 kg, respectively. The highest milk yield and lactation period were observed in Jamunapari goats than other crosses. The average ageat puberty of Jamunapari, Black Bengal and crossbred goats were 335.00 ± 25.77,194.12 ± 18.73 and 287.50 ± 22.57 days, respectively. Ageat first conceptionof Jamunapari, Black Bengal and crossbred goats were 381.00 ± 22.54, 217.94 ± 16.87 and 321.25 ± 21.25 days,respectively. Ageat first kiddingof Jamunapari, Black Bengal and crossbred goats were 534.00 ± 24.58,368.12 ± 16.96 and 471.25 ± 21.25 days, respectively. The kidding interval of Black Bengal goat was lower i.e. the reproductive performance is better in Black Bengal goat than Jamunapari and crossbred goats.Gestation period of Jamunapari, Black Bengal and crossbred goats were 151.71 ± 8.19, 146.72 ± 7.61 and 147.85 ± 7.74 days, respectively. تفاصيل المقالة

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3 - Effect of Goat Follicular Fluid on <i>in vitro</i> Production of Embryos in Black Bengal Goats
S.A. Masudul Hoque M.A.M. Yahia Khandoker S.K. Kabiraj L.Y. Asad M. Fakruzzaman K.M.A. Tareq

The study was undertaken to elucidatethe beneficial effects of goat follicular fluid (gFF) added to maturation and culture media on in vitro maturation, fertilization and post-fertilization development of oocytes in Black Bengal goats. Follicular fluid and oocytes were أکثر

The study was undertaken to elucidatethe beneficial effects of goat follicular fluid (gFF) added to maturation and culture media on in vitro maturation, fertilization and post-fertilization development of oocytes in Black Bengal goats. Follicular fluid and oocytes were collected from slaughter house goat’s ovaries using the aspiration technique. Media were prepared using TCM-199 supplemented with 0.5% bovine serum albomin (BSA) plus four levels of gFF at concentrations of 0%, 5%, 10% and 15%. Oocytes were matured for 27 h, fertilized with capacitated fresh semen in Brackett and Oliphant (BO) medium for 6 h and then cultured up to 7 days, at 38.5 ˚C with 5% CO2 under humidified air. It was observed with 0% to 15% of gFF that 53.8-75.0% of the oocytes reached the cumulus cell expansion level-3; 41.5-67.8% reached metaphase-II; 28.6-38.4% exhibited normal fertilization (formation of 2-pronuclei); 12.3-33.7% were 2-cell embryos. The development of embryos was arrested at the 2-cell stage in control media and at the 8-cell stage in 5% media, though morula and blastocyst stages developed in 10% (14.1% and 9.3%, respectively) and 15% gFF media (18.0% and 10.0%, respectively). In comparison, it was observed that the results in all stages of in vitro production of embryos could be significantly increased (P<0.05) by adding 5% gFF to control media. The results could further be improved (P<0.05) by increasing the level of gFF to 10% but no further increment (P>0.05) occurred when gFF increased to 15% level. It is concluded that gFF has a positive effect on in vitro production of embryos in Black Bengal goats and a 10% level of gFF is recommended based on the improvements observed and the associated economic benefits. تفاصيل المقالة

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4 - Genetic and Phenotypic Parameters for Semen Characteristics and Their Relationship with Scrotal Circumference in Black Bengal Bucks
ام.ام میا ام.آ.ام.ی. خاندوکر اس.اس. هوساین ام.او. فاروغ دی.آر. نوتر آ.اس. آپو

Black Bengal goat is the heritage and one of the potential genetic resources of Bangladesh. Genetic and phenotypic parameters for semen characteristics and their relationships with scrotal circumference in Black Bengal bucks were estimated in this experiment. Genetic pa أکثر

Black Bengal goat is the heritage and one of the potential genetic resources of Bangladesh. Genetic and phenotypic parameters for semen characteristics and their relationships with scrotal circumference in Black Bengal bucks were estimated in this experiment. Genetic parameters were estimated by residual maximum likelihood procedure, fitting an animal model ignoring maternal genetic or permanent environmental effects. The least-squares means of semen volume (mL/ejaculate), sperm concentration (109cells/mL), mass motility (%), sperm livability (%) and normal spermatozoa (%) were 0.56, 2.55, 79.7, 86.8 and 90.5, respectively. Season of collection and scrotal circumference significantly affected all semen characteristics studied. Age of bucks affected all the semen characteristics, except mass motility. Body weight had a significant effect on semen volume and mass motility. Heritability estimates were moderate for sperm concentration (0.38) and low for semen volume, mass motility, sperm livability and normal spermatozoa (0.05 to 0.18). Phenotypic correlations ranged from slightly negative (-0.001) to moderately positive (0.42) and the genetic correlations ranged from moderately negative (-0.37) to strongly positive (0.99). Sperm concentration was the only semen trait of Black Bengal goat where reasonable genetic progress may be possible through selection. Selection for increased scrotal circumference should have favorable correlated response in semen characteristics. تفاصيل المقالة

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5 - Genetic Evaluation of Growth Traits of Black Bengal Goat
ام.ام. میا ام.آ.ام.ی. خاندوکر اس.اس. هوساین ام.او. فاروق دی.آر. نوتر M.N. Haque

Black Bengal goat is the heritage and one of the potential genetic resources of Bangladesh. Least-squares means for body weights at birth, 3, 6, 9 and 12 months of age were 1.09, 5.12, 8.02, 10.92 and 14.47 kg, respectively. Sex of the kid has significant (P<0.05) ef أکثر

Black Bengal goat is the heritage and one of the potential genetic resources of Bangladesh. Least-squares means for body weights at birth, 3, 6, 9 and 12 months of age were 1.09, 5.12, 8.02, 10.92 and 14.47 kg, respectively. Sex of the kid has significant (P<0.05) effect on body weights at 6, 9 and 12 months of age. Type of birth and parity of the dam has significant (P<0.01) effect on birth weight only, whereas season of birth affected (P<0.05) all the body weight traits. Heritability estimates for body weights at birth, 3, 6, 9 and 12 months of age were 0.45, 0.47, 0.45, 0.49 and 0.47, respectively. Genetic correlations between body weight traits ranged from 0.34 to 0.83, whereas phenotypic correlations ranged from 0.34 to 0.90. The high heritability estimates obtained for body weights indicated that mass selection would generate substantial selection responses at all stages of growth. تفاصيل المقالة

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