We examined the effects of housing type × feeding system on Holstein milk yield, using 305-day milk yield records for 382,269 cows in Japan calving between 2008 and 2012. Milk yield records were analyzed in first-, second-, and third-lactation subsets. There were three barn-type traits (tie-stall [TS], free-stall [FS], and grazing [GZ]). We used a trivariate animal model for multiple-trait analyses. Two different feeding systems (separate feeding of pasture plus concentrate, SF; total mixed ration, TMR) and different numbers of management groups (MGs) per farm (1, 2, or >2) were evaluated. For the effect of housing × feeding system × MG number, higher milk yields were estimated for TS/TMR/2MG (+663, +911, and +968 kg for first, second, and third lactations, respectively) and FS/TMR/3MG (+518, +783, and +757 kg, respectively) than with TS/SF/1MG. The GZ/SF/1MG estimates (–530, –525, and –490 kg, respectively) were the lowest.

Koichi Hagiya, Satoshi Yamaguchi, Kiyoshi Hayasaka, Takeshi Yamazaki, Takefumi Osawa, Hayato Abe, Satoshi Nakagawa, Takayoshi Kawahara, Mitsuyoshi Suzuki

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Species Breeding: Dairy cattle (Posters), , 814, 2014
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