The use of frozen semen of Holstein-Friesian bulls with the bb genotype of the kappa casein gene in Indonesia
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The use of the kappa casein (CSN3) gene as MAS could be an effective way to identify a dairy bull with highly transmitted milk protein yield, as the CSN3 gene is one of dominant casein genes. The aims of this study was to identify the BB CSN3 genotype in Holstein-Friesian (HF) males as active and candidate AI services from the two national AI stations. Distribution of frozen semen of BB active AI bulls was studied continued by investigation of the use of the BB bulls in servicing HF females focused in dairy locations of BPPT SP Cikole and KPSBU Lembang. Two BB active AI bulls were identified at BBIB Singosari, namely Pipenary (No. 30 569) and Goldsy B (No. 30 667) of both from East Java. Pipenary produced large quantities of frozen semen distributed in Java, while B Goldsy produced frozen semen still at a low dose. At BIB Lembang was also identified two BB males, but the only bull of Kemang (No. 39 766) produced a lot of frozen semen, while another (P013) died before semen collection. Kemang's frozen semen was distributed in Java, Lampung and South Sulawesi. From 11 bulls actively used to serve HF lactating cows in KPSBU in 2007-2009 showed only Pipenary with the BB genotype. The two AI stations are suggested to increase the BB CSN3 active AI bulls.
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