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