[Show abstract][Hide abstract] ABSTRACT: In the present experiment volume, concentration, mass movement and forward movement of semen of different genotypes of bulls relating to body weight, age, sexual maturity and season were evaluated. A total of 1422 semen samples from 22 different bulls of seven genotypes were included in this study from Central Cattle Breeding Station (CCBS), Shavar, Dhaka, Bangladesh. Among the seven genotypes of bulls, only the Friesian bulls gave the largest volume of semen (14.26 Ã‚Â± 0.19 mL), mass movement (4.87 Ã‚Â± 0.07 grade) and forward movement (61.29 Ã‚Â± 0.31%) of sperm. While considering the age, the bulls of 4 to 6 years old provided the highest semen volume (13.60 Ã‚Â± 0.18 mL), sperm concentration (1219.89 Ã‚Â± 10.72 million sperm mL<SUP>1</SUP>), mass movement (4.66 Ã‚Â± 0.06 grade) and forward movement (61.34 Ã‚Â± 0.28%) of sperm. The highest volume (12.01 Ã‚Â± 0.22 mL) of semen, sperm concentration (1182.29 Ã‚Â± 14.30 million sperm mL<SUP>1</SUP>), mass movement (4.40 Ã‚Â± 0.08 grade) and forward movement (58.74 Ã‚Â± 0.54%) of sperm was found in 3 years age of sexual maturity. In case of body weight, the maximum volume of semen (12.16 Ã‚Â± 0.22 mL) and forward movement (60.25 Ã‚Â± 0.45%) of sperm was obtained in the bulls of 400 to 600 kg body weight and the volume was maximize (12.15 Ã‚Â± 0.23 mL) in summer season. The findings suggested that Friesian produced better quality semen than other genotypes while 4 to 6 years age and >600 to 700 kg body weight of bulls performed better than other age and body weight groups. The summer season gave better quality semen than other seasons.
[Show abstract][Hide abstract] ABSTRACT: Hatching performance of eggs of two broiler parent stocks was investigated in three different seasons of the year under Bangladesh conditions. Two strains of broiler breeder flocks were reared separately on floor from 22 to 48 weeks of age and eggs laid by these birds during spring, summer and monsoon were considered for this study. Each season was treated as treatment with 4 sets, each of 50 eggs as replicates within a treatment. One thousand two hundred hatching eggs (600 from Starbro and 600 from ISA MPK) were incubated in a James-way forced-draft electric incubator and the required records were kept during incubation and following taking out of hatches. The results of the experiment showed that hatching performance of eggs from Starbro was significantly better in spring than those observed during summer and monsoon. The hatchability results from ISA MPK also showed trends similar to Starbro but data did not differ significantly among seasons of the year. It may be concluded from the study that it is better to consider hatching of large number of eggs during spring if the broiler parents are reared in open-sided house.