Abstract
Effect of Semen Collection Frequency and Scrotal Circumference on Semen Quality Parameters in Brahman x Local Crossbred Bulls
Highlights
The cattle population of Bangladesh is 23.30 million, which consists of Local zebu, Friesian- Local crossbred, Friesian-Sahiwal crossbred and Sahiwal-Local crossbred (DLS, 2013)
Ejaculation during false mount and or before the penis could be covered with the artificial vagina accounted for 1 failure in 2x group and 2 failures in 4x group, while 14 failures happened because of not giving second ejaculate by 4x bulls
The present findings showed that weekly semen output of 4x bulls increased 1.43 times compared to 2x bulls
Summary
The cattle population of Bangladesh is 23.30 million, which consists of Local zebu, Friesian- Local crossbred, Friesian-Sahiwal crossbred and Sahiwal-Local crossbred (DLS, 2013). Out of 6.9 million breedable cows and heifers, Friesian-Local crossbred contributes about 24% (Huque et al, 2011). More than 80% of the breeding bulls used in national artificial insemination program are Friesian-Local crossbred. In the year of 2009, National beef cattle development program was undertaken for crossbreeding between local zebu cows and Brahman sires through artificial insemination. Greater utilization of genetically superior Brahman-Local crossbred bulls for flourishing beef industry can be achieved by frequent semen collection from them. Collection of two ejaculates from breeding bulls is a common practice at Central Artificial Insemination Laboratory in Bangladesh.
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