The present study was conducted to know the productive and reproductive performance of Black Bengal goats in relation to different coat colors. A total of 609 Black Bengal goats were selected from 35 private owned farms in Sylhet division during November 2017 to October 2018. Average birth weight and adult body weight gain after 12 months of white, solid black, black with Dutch belt spotting, and brown bezoar coat color goats were varied significantly. Birth weight is high in black with Dutch belt spotting coat and the adult weight gain after 12 months is high in solid black coat color. The average daily milk yield and the average lactation period of white, solid black, black with Dutch belt spotting, and brown bezoar coat color goats were varied significantly. The age at puberty varied according to the coat color. The age of first kidding of white, solid black, black with Dutch belt spotting and brown bezoar coat color goats did not vary significantly. The average gestation period in 1^st parity, age at first conception and post-partum estrous of Black Bengal goat were not affected by the coat colors. Number of litter per kidding was higher in solid black i.e. the reproductive performance is better in solid black coated goats than that of other coat colors. From the present study, it may be concluded that the performances of solid black color goats were better than other coat colors in terms of adult weight of does, daily milk yield, lactation period, age at puberty, service per conception and litter size.

Keywords: Black Bengal Goat, Coat Color, Productive Performance, Reproductive Performance

This study was conducted to compare the performance of crossbred cow likely L×F (50% L and 50% F), L×H×F×F×L×F (68.75% F, 28.125% L and 3.125% H), L×F×F (75% F and 25% L), L×F×L×F×F (81.25% F and 18.75% L), L×SL (50% L and 50% SL), L×SL×SL (75% SL and 25% L), L×SL×F (50% F, 25% L and 25% SL), L×S (50% L and 50% S) and L×Rc (50% L and 50% Rc). A total of 240 crossbred cows were selected from five upazilas of Comilla district. It was observed that mean milk yield per day for L×F, L×H×F×F×L×F, L×F×F, L×F×L×F×F, L×SL, L×SL×SL, L×SL×F, L×S and L×Rc crossbreds cattle were 6.03±0.5, 7.3±0.6, 9±0.5, 10±0.5, 4.51±1.06, 5±1.06, 4.16±0.81, 4±0.5 and 3±0.5 litre, respectively. The lactation length of L×F, L×H×F×F×L×F, L×F×F, L×F×L×F×F, L×SL, L×SL×SL, L×SL×F, L×S and L×Rc crossbreds cattle were 285±5, 285±5, 285±5, 285±5, 251±5, 253±5, 259±5, 248±5 and 220±5 days, respectively. About the reproductive performances L×F, L×SL and L×SL×SL cross breed cattle need minimum (1.61±0.61) services per conception and LxS crossbred cattle need maximum (1.78±0.63) services per conception. Gestation length was shorter (277±3.31 days) in case of L×Rc cross and highest (279.7±4.2 days) in case of L×SL×SL crossbred cattle. The highest calving interval was 447±20 days and found in L×S crossbred cattle and the lowest calving interval was 430±20 days and observed in L×F, L×H×F×F×L×F, L×F×F and L×F×L×F×F crossbred cattle. Calving interval was lower (430±20 days) in L×F, L×H×F×F×L×F, L×F×F and L×F×L×F×F crosses and higher (447±20 days) in L×S crossbred cattle. Age at puberty was shorter in L×SL×F cross 26.2±2.4 months and longer in L×SL×SL cross 29.3±2.3 months. Based on the results obtained from current study, it can be concluded that the L×F (50% L and 50% F) crossbred cattle is more suitable under climatic and socio-economic condition of Comilla district in Bangladesh.

Keywords: Crossbred cattle, productive performance, reproductive performance